The purpose of the present invention is to provide: a hardly graphitizable carbon which enables the achievement of a high discharge capacity; a negative electrode for lithium ion secondary batteries; and a lithium ion secondary battery. A hardly graphitizable carbon according to the present invention has a strain e of 0.081 to 0.120 as determined by a Williamson-Hall method using a profile that is obtained by performing a Rietveld analysis on the X-ray diffraction pattern thereof, while having a lattice spacing d002 of 0.360 nm to 0.370 nm, the lattice spacing d002 corresponding to the 002 reflection, as determined by performing a Rietveld analysis on the X-ray diffraction pattern.
H01M 4/587 - Carbonaceous material, e.g. graphite-intercalation compounds or CFx for inserting or intercalating light metals
H01M 4/36 - Selection of substances as active materials, active masses, active liquids
3.
METHOD FOR ESTABLISHING ESTIMATION MODEL FOR COKE STRENGTH AFTER REACTION, METHOD FOR ESTIMATING COKE STRENGTH AFTER REACTION, AND METHOD FOR MANUFACTURING COKE
Provided is a method for establishing an estimation model for coke strength after reaction with which it is possible to rapidly estimate coke strength after reaction.A method for establishing an estimation model for coke strength after reaction includes a step of obtaining coke strength after reaction, a step of obtaining a TG curve of the coke, and a model establishing step of establishing an estimation model for coke strength after reaction by using the TG curve obtained in the step of obtaining the TG curve of the coke as an explanatory variable and by using the strength after reaction obtained in the step of obtaining the coke strength after reaction as an objective variable.
C10B 57/04 - Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
G01N 5/04 - Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
4.
METHOD FOR ESTIMATING COKE STRENGTH AFTER REACTION AND METHOD FOR MANUFACTURING COKE
An object is to provide a method for rapidly estimating coke strength after reaction.A method for estimating coke strength after reaction, the method including a heating process of heating ground coke to a predetermined temperature range in an inert gas atmosphere and/or in a CO2 atmosphere, a holding process of holding the heated coke in a CO2 atmosphere at a holding temperature in the predetermined temperature range, and a process of determining a weight decrease rate of the coke after having been held at the holding temperature for a predetermined time by using a thermogravimetry method and of estimating coke strength after reaction from the weight decrease rate.
It is to easily obtain a ratio of at least one of the microstructural component groups of coal. Provided therefor is a coal analyzer 1 including an image acquisition unit 2 that acquires a surface image of a coal sample 7, an identification unit 3 that identifies a microstructural component group included in the surface image, and a calculation unit 4 that calculates a ratio of at least one of the microstructural component groups. The calculation unit 4 calculates a total inert amount that is a ratio of inertinite among the microstructural component groups. The coal analyzer 1 preferably includes a correction unit 5 that corrects the total inert amount.
The present invention provides carbonaceous material-coated graphite particles that exhibit excellent output characteristics if used as a negative electrode material of a lithium ion secondary battery. The carbonaceous material-coated graphite particles comprise graphite particles, and a carbonaceous coating material that covers at least a part of the respective surfaces of the graphite particles; the maximum particle diameter is 30.0 to 90.0 µm; the pore volume VS corresponding to the pores having a pore size of 7.8 to 36.0 nm is 0.009 to 0.164 cm3/g; and in the pore size distribution chart in which the pore size is plotted on the horizontal axis and dV/dP that is obtained by differentiating the pore volume by the pore size is plotted on the vertical axis, the pore size Pmax at which the dV/dP is maximum is 2.5 to 5.5 nm.
Provided are carbon-coated graphite particles having excellent battery characteristics when used as a negative electrode material in a lithium-ion secondary battery. The carbon-coated graphite particles each comprise a graphite particle and a carbon coating which coats at least a portion of the surface of the graphite particle. The specific surface area SBET found using the BET method is 4.0-15.0 m2/g. The pore volume VS corresponding to pores having a pore size from 7.8-36.0 nm is from 0.001-0.026 cm3/g. In a pore size distribution diagram obtained by plotting pore size on the horizontal axis and plotting dV/dP, which is a value obtained by differentiating the pore volume by the pore size, on the vertical axis, the pore size Pmax at which the dV/dP is greatest is from 2.5-5.5 nm.
The present invention provides a coated spheroidized graphite which exhibits excellent cycle capacity retention properties if used as a negative electrode material of a lithium ion secondary battery. This coated spheroidized graphite contains a spheroidized graphite wherein the volume fraction of primary particles having a sphere equivalent diameter of 0.8 µm or less is more than 40.0% but not more than 70.0% and the volume fraction of primary particles having a sphere equivalent diameter of 1.5 µm to 3.0 µm is 3.0% to 17.0% in the particle size distribution of the primary particles as determined with use of X-ray CT, and a carbonaceous material that covers the spheroidized graphite; the pore volume of pores having a pore diameter of 7.8 nm to 36.0 nm is 0.017 cm3/g or less; and the mass of permeated dibutyl phthalate is less than 0.70 g/cm3.
There is provided a wound core with low transformer iron loss and good magnetic characteristics without using two or more types of materials with different magnetic characteristics. A wound core according to the present invention is composed of a grain-oriented electrical steel sheet as a material and has a flat surface portion, a corner portion adjacent to the flat surface portion, a lap portion in the flat surface portion, and a bent portion in the corner portion, and the ratio of the length of the outer circumference to the length of the inner circumference (the length of the outer circumference/the length of the inner circumference) is 1.80 or less when viewed from the side, and the grain-oriented electrical steel sheet has a magnetic flux density B8 in the range of 1.84 T to 1.91 T at a magnetic field strength H of 800 A/m and has a specified iron loss deterioration rate of 1.50 or less under compressive stress.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
There is provided a wound core with low transformer iron loss and good magnetic characteristics without using two or more types of materials with different magnetic characteristics. A wound core according to the present invention is composed of a grain-oriented electrical steel sheet as a material and has a flat surface portion, a corner portion adjacent to the flat surface portion, a lap portion in the flat surface portion, and a bent portion in the corner portion, and the ratio of the length of the outer circumference to the length of the inner circumference (the length of the outer circumference/the length of the inner circumference) is 1.70 or less when viewed from the side, and the grain-oriented electrical steel sheet has a magnetic flux density B8 in the range of 1.92 T to 1.98 T at a magnetic field strength H of 800 A/m and has a specified iron loss deterioration rate of 1.30 or less under harmonic superposition.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
11.
IRON-BASED SOFT MAGNETIC POWDER, MAGNETIC COMPONENT USING SAME AND DUST CORE
The present invention provides an iron-based soft magnetic powder which is capable of producing a dust core that has a low core loss. The present invention provides an iron-based soft magnetic powder wherein: the crystallinity is 10% or less; the volume-based median value (C50) of circularity is 0.85 or more; the number density of Cu clusters in the powder is from 1.00 × 103/µm3 to 1.00 × 106/µm3 if the iron-based soft magnetic powder is heated to 400°C at a heating rate of 3°C/minute, kept at the temperature for 20 minutes, and subsequently allowed to naturally cool to room temperature in a nitrogen atmosphere; and the average Cu concentration of the Cu clusters is 30.0 at% or more.
To provide a method for producing agglomerated ore, with which reduced iron can be efficiently produced by hydrogen reduction, without the need for preheating raw material and raising the temperature of reducing gas. A method for producing agglomerated ore, the method including sintering a sintering raw material containing an iron-containing raw material and a condensation material in a sintering machine to form a sinter cake, and obtaining agglomerated ore by crushing the sinter cake, in which iron oxide contained in the sinter cake is reduced by distributing a reducing gas through the sinter cake on the sintering machine, to make a degree of reduction of iron oxide contained in the agglomerated ore after crushing 50 % or more.
An agglomerated ore assessing method is provided that can assess clustering of reduced iron when it has been reduced at a high hydrogen concentration, with thermal compensation using blowing sensible heat taken into account. In this method, agglomerated ore is reduced while being subjected to a predetermined load at 1000?C to 1200?C, both inclusive, to produce a reduced aggregate; a tumble treatment is performed on the reduced aggregate using a tumble tester; cluster strength CS of the reduced aggregate calculated by Formula (1) below is measured; and a clustering property of the agglomerated ore is assessed using the cluster strength CS: CS = (W'/W) ? 100 ??? (1), where CS is cluster strength (mass%); W is the mass (g) of a reduced aggregate that is equal to or larger than a maximum particle diameter of the agglomerated ore; and W' is the mass (g) of a reduced aggregate after a tumble treatment in the tumble tester that is equal to or larger than the maximum particle diameter of the agglomerated ore.
Provided are a molten steel secondary refining method and a steel production method which make it possible to stably and quickly attain a low-nitrogen-concentration range without causing operational problems. A molten steel secondary refining method which involves combining an Al addition step for forming Al-containing molten steel by adding a metal Al-containing substance to molten steel with a CaO addition step for adding a CaO-containing substance to molten steel, and by doing so, forming slag which contains CaO and Al2O3, and thereafter, executing an oxygen transfer treatment which includes a denitrification treatment by blowing an oxygen-containing gas into the Al-containing molten steel through the slag, wherein the Al concentration [Al]i (mass%) in the molten steel immediately before the oxygen transfer treatment is no less than a value [Al]e when calculated according to the following formula (A), and the Al concentration [Al]f when the oxygen transfer treatment is completed is 0.03 mass% or higher, on the basis of the stirring power density ? (W/t) at the time of slag formation. This steel production method involves subjecting the obtained molten steel to casting following component adjustment. (A): [Al]e=-0.072×ln(?)+0.5822
The present invention proposes a method with which it is possible to stably and quickly reach a very low nitrogen concentration range without use of top lance gas. This molten steel denitrification method is a denitrification process of bringing a slag containing CaO and Al2O3 formed by a combination of an Al addition step for adding a metal Al-containing substance to molten steel for deoxidation to obtain an Al-containing molten steel, and a CaO addition step for adding a CaO-containing substance to the molten steel, into contact with the Al-containing molten steel to remove nitrogen from the molten steel. The molten steel is stirred at a stirring power density ? of at least 60 W/t. The denitrification process is preferably performed on the surface the slag or the molten steel in an atmosphere of at most 1.0×105 Pa. This steel production method includes casting the obtained molten steel after component adjustment.
Proposed is a method in which a denitrification treatment with which nitrogen concentration can stably and quickly reach an extremely low nitrogen concentration range is performed, and the denitrification treatment and a desulfurization treatment are performed in the same treatment, and by which the denitrification or the denitrification and desulfurization of molten steel can be efficiently performed. In this molten steel denitrification treatment, slag 4 containing CaO and Al2O3 is formed on molten steel 3 filled in a container 1, oxygen-containing gas is blown from above the slag, and the slag is brought into contact with the molten steel to remove nitrogen in the molten steel. This molten steel denitrification method is characterized in that the Al concentration in the molten steel is secured at a value which is equal to or greater than the value determined by equation (1) according to the stirring power density, and the oxygen-containing gas is blown so that the ratio of the depth LS of a recess of the slag formed by blowing the oxygen-containing gas to the thickness LS0 of the slag satisfies LS/LS0?1. Al concentration (mass%) in molten steel=-0.072×ln (stirring power density (W/t))+0.5822(1)
The present invention proposes a method whereby it is possible to reach an extremely low nitrogen concentration range stably within a short period of time. Provided is a molten steel denitrification method in which denitrification treatment is carried out by forming slag that contains CaO and Al2O3 by combining an Al addition step for adding a metal Al-containing substance to molten steel to deoxidize the molten steel and obtain Al-containing molten steel and a CaO addition step for adding a CaO-containing substance to the molten steel, and then spraying an oxygen-containing gas onto the slag. The T.Fe in the slag after the denitrification treatment is set to 3.0 mass% or less. In the denitrification treatment, it is preferred that, when supplying the oxygen-containing gas, the ratio LS/LS0 of the depth LS of a depression in the slag that is formed as the result of the spraying of the oxygen-containing gas to the thickness LS0 of the slag is 0.9 or less. Also provided is a steel production method in which the contents in the molten steel thus produced are adjusted and then the molten steel is cast.
Provided is an ore crushing method capable of efficiently crushing iron ores that are difficult to finely crush. The ore crushing method includes coarsely crushing the iron ores to reduce the proportion of particles with a particle size of greater than or equal to 1 mm, and then finely crushing the iron ores to increase the proportion of particles with a particle size of less than 63 micrometers . The average pore size of the iron ores is preferably less than or equal to 10 micrometers , the proportion of the particles with a particle size of greater than or equal to 1 mm in the iron ores is preferably greater than or equal to 30 mass%, the iron ores are preferably coarsely crushed so that the proportion of the particles with a particle size of greater than or equal to 1 mm becomes less than or equal to 20 mass%, the iron ores are preferably finely crushed so that the proportion of the particles with a particle size of less than 63 micrometers becomes greater than or equal to 70 mass%, and the iron ores are preferably finely crushed with a wet ball mill. A pellet production method is also provided that includes granulating a raw material, which includes the iron ores crushed with the ore crushing method, into pellets.
B02C 17/04 - Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with unperforated container
Provided is a grain-oriented electromagnetic steel sheet having excellent transformer characteristics and achieving both low iron loss and low magnetostriction. This grain-oriented electromagnetic steel sheet has a thermal strain region extending in a direction transversal to a rolling direction, said steel sheet has a closure domain inside the thermal strain region, the thermal strain region has tensile strain maximum points on both outer sides of the closure domain in the rolling direction, and in a strain distribution of the thermal strain region in the rolling direction, the strains on both outer sides of the closure domain are tensile strains greater than the strain at the center between the maximum points.
H01F 1/147 - Alloys characterised by their composition
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
The present invention provides a grain-oriented electromagnetic steel sheet having excellent transformer characteristics and achieving both low iron loss and low magnetostriction. In a magnetic flux density B-magnetostriction waveform ? (butterfly curve) of said grain-oriented electromagnetic steel sheet when excited to 1.5 T or higher, the amount of steel sheet elongation (??) in a magnetic flux density B range of 1.0 to 1.5 T is in a range of 0.010 x 10-6 to 0.240 x 10-6, and the length of a closure domain in a rolling direction (closure domain width) is 20 µm to 240 µm.
H01F 1/147 - Alloys characterised by their composition
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
Provided is a grain-oriented electrical steel sheet that has excellent transformer characteristics and achieves both low iron loss and low magnetostriction. According to the present invention, a grain-oriented electrical steel sheet has a thermal strain region that extends linearly in a direction that crosses a rolling direction. The strain distribution of the thermal strain region in the rolling direction is such that the strain at either end of the thermal strain region is tensile strain that is greater than the strain at the center of the thermal strain region.
H01F 1/147 - Alloys characterised by their composition
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
22.
POSITION DETECTION DEVICE FOR SEAM PORTION AND HEATED PORTION OF WELDED STEEL PIPE, MANUFACTURING FACILITY FOR WELDED STEEL PIPE, POSITION DETECTION METHOD FOR SEAM PORTION AND HEATED PORTION OF WELDED STEEL PIPE, MANUFACTURING METHOD FOR WELDED STEEL PIPE, AND QUALITY CONTROL METHOD FOR WELDED STEEL PIPE
A position detection device for a seam portion and a heated portion of a welded steel pipe detects a position of the seam portion of the welded steel pipe and a position of the heated portion generated by heating the seam portion and/or near the seam portion. The position detection device includes an irradiation unit that emits light, an imaging device that captures a first image of the seam portion and the heated portion irradiated with light and a second image of the seam portion and the heated portion not irradiated with light, and a control device that controls light irradiation by the irradiation unit and an imaging timing of the imaging device.
B21C 37/08 - Making tubes with welded or soldered seams
B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses
G01B 11/00 - Measuring arrangements characterised by the use of optical techniques
23.
HIGH-STRENGTH HOT ROLLED STEEL SHEET AND METHOD FOR PRODUCING THE SAME, AND HIGH-STRENGTH ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME
Provided are a high-strength hot-rolled steel sheet and manufacturing method therefor, and a high-strength electric resistance welded steel pipe and manufacturing method therefor. In the high-strength hot-rolled steel sheet according to the present invention, the steel structure at the thickness center contains bainite and ferrite at specific volume ratios, the average crystal grain size is 9.0 ?m or less, the dislocation density is 1.0 x 1014m-2 to 1.0 x 1015m-2, inclusive, the steel structure at a depth of 0.1 mm from the plate surface contains bainite and ferrite in specific volume ratios, the average crystal grain size is 9.0 ?m or less, the dislocation density is 5.0 x 1014m-2 to 1.0 x 1015m-2, inclusive, the maximum low-angle grain boundary density is 1.4 x 106m-1 or less, and the thickness is 15 mm or more.
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
24.
RAW MATERIAL PARTICLES FOR PRODUCTION OF AGGLOMERATE, METHOD FOR PRODUCING RAW MATERIAL PARTICLES FOR PRODUCTION OF AGGLOMERATE, AGGLOMERATE, METHOD FOR PRODUCING AGGLOMERATE, AND METHOD FOR PRODUCING REDUCED IRON
Provided is a raw material particle for production of agglomerate that can be used to produce an agglomerate with better reducing performance than conventional agglomerates. The raw material particle 1(2) of the present disclosure is a raw material particle for producing an agglomerate as a raw material for producing reduced iron, including a central part 11(21), and a peripheral part 12(22) that covers the periphery of the central part 11(21). The central part 11 has a metal iron-containing substance, the central part 12 has a volatile substance, and the peripheral part 12(22) has iron oxide.
Provided is a reduced iron production method that can efficiently produce reduced iron without preheating raw materials. The reduced iron production method includes charging an agglomerate, which is a raw material of reduced iron, into a reducing furnace while introducing a reducing gas, which contains hydrogen as a main component, into the reducing furnace, and reducing iron oxide contained in the agglomerate by the reducing gas to obtain reduced iron, where the agglomerate to be charged into the reducing furnace is an agglomerate that retains heat obtained during its production, and the heat is used in a reduction reaction of the iron oxide.
Provided are a high-strength duplex stainless steel pipe having an excellent wear resistance or dent resistance on the inner and outer surfaces of a steel pipe, and a method for manufacturing the same. The present invention has a component composition containing, by mass, 0.005 to 0.150% of C, 1.0% or less of Si, 10.0% or less of Mn, 11.5 to 35.0% of Cr, 0.5 to 15.0% of Ni, 0.5 to 6.0% of Mo, and less than 0.400% of N, with the remainder made up by Fe and unavoidable impurities, and has a steel structure having a ferrite phase and an austenite phase. The pipe axial direction tensile yield strength is 689 MPa or above, and the present invention has, on the steel pipe outer surface and the steel pipe inner surface, an oxide layer having a thickness of 1.0 µm or above.
C21D 7/10 - Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
27.
PLASMA TREATMENT METHOD, METHOD OF PRODUCING PLASMA-TREATED HEXAGONAL BORON NITRIDE POWDER, AND PLASMA TREATMENT DEVICE
Provided is a hexagonal boron nitride powder capable of achieving higher thermal conductivity when added to a resin as a filler. A plasma treatment method for plasma-treating a hexagonal boron nitride powder under reduced pressure, said method comprising: housing the hexagonal boron nitride powder in a treatment vessel; while supplying a plasma-generating gas into the treatment vessel, maintaining the inside of the treatment vessel at a pressure lower than the atmospheric pressure; and while rotating the treatment vessel with the central axis of the treatment vessel as the rotation axis, applying a high frequency to an electrode disposed outside the treatment vessel to thereby plasma-treat the hexagonal boron nitride powder in the treatment vessel. The rotation axis of the treatment vessel is inclined to the horizontal direction, and the treatment vessel and/or the electrode are cooled during the plasma treatment.
C01B 21/064 - Binary compounds of nitrogen with metals, with silicon, or with boron with boron
C04B 35/5833 - Shaped ceramic products characterised by their composition; Ceramic compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on non-oxides based on borides, nitrides or silicides based on boron nitride based on hexagonal boron nitride
H05H 1/46 - Generating plasma using applied electromagnetic fields, e.g. high frequency or microwave energy
28.
GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD THEREFOR
Provided is a grain-oriented electrical steel sheet that takes advantage of a core loss reduction effect due to formation of grooves and that can effectively inhibit a reduction in magnetic flux density. This grain-oriented electrical steel sheet has predetermined linear grooves. In each of the linear grooves, the proportion of a flat part as defined in a predetermined manner is 30-90% with respect to the entire length of the linear groove, the number of portions where the flat part is continuous over a predetermined length is at least 10 per surface area of 100 cm2, and the ratio of the ten-point average roughness Rzjis with respect to the average depth D is 0.1-1.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
H01F 1/147 - Alloys characterised by their composition
29.
POSITION DETECTION APPARATUS FOR SEAM PORTION AND HEATING PORTION OF WELDED STEEL PIPE, MANUFACTURING EQUIPMENT FOR WELDED STEEL PIPE, POSITION DETECTION METHOD FOR SEAM PORTION AND HEATING PORTION OF WELDED STEEL PIPE, MANUFACTURING METHOD FOR WELDED STEEL PIPE, AND QUALITY CONTROL METHOD FOR WELDED STEEL PIP
A position detection apparatus for a seam portion and a heating portion of a welded steel pipe is a position detection apparatus configured to detect a position of the seam portion of the welded steel pipe and a position of the heating portion, the position detection apparatus including a light source configured to irradiate the seam portion and the heating portion with light in a first wavelength range, an imaging unit configured to capture an image of each of the seam portion and the heating portion irradiated with the light by the light source, and an image processing unit configured to process the image captured by the imaging unit and to detect the position of each of the seam portion and the heating portion, in which the imaging unit includes a first channel capable of receiving the light in the first wavelength range, and a second channel capable of receiving light in a second wavelength range corresponding to radiation light from the heating portion.
B21C 37/08 - Making tubes with welded or soldered seams
B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses
G01B 11/00 - Measuring arrangements characterised by the use of optical techniques
30.
GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD THEREFOR
Provided is a grain-oriented electromagnetic steel sheet on which magnetic domain refinement treatment has been performed using laser irradiation and from which excellent noise reduction performance and low core loss properties can be obtained when being assembled into an actual machine transformer. In a grain-oriented electromagnetic steel sheet according to the present invention, the magnetic flux density B8 is set to at least 1.92 T, the ratio (Wa/Wb) between the film thickness Wa of a forsterite coating film on a strain-introduced surface and the film thickness Wb of a forsterite coating film on a non-strain-introduced surface is set to at least 0.5, the average width of magnetic domain discontinuous parts on the non-strain-introduced surface is set to at least 1.00 times the average width of magnetic domain discontinuous parts on the strain-introduced surface, the average width of magnetic domain discontinuous parts on the non-strain-introduced surface is set to at most 400 ?m, and compressive stress is present in the rolling direction in a range of at least 2 ?m, in the sheet thickness direction, from the steel sheet surface that is the strain-introduced surface.
B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
B23K 26/356 - Working by laser beam, e.g. welding, cutting or boring for surface treatment by shock processing
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Provided is a method for producing a fine water-atomized metal powder that has a high amorphization rate, a high apparent density, and a high roundness even in the case where the contained amount of iron-based components is great. This method for producing a water-atomized metal powder by jetting cooled water so as to collide with a molten metal flow falling down vertically and to segment the molten metal flow into a metal powder, the method comprising a step for jetting cooled water from at least three cooled water outlets disposed at a distance from the falling molten metal flow, at a spread angle in the range of 5-30° and at a jetting pressure of at least 10 MPa. The cooled water has a droplet diameter of at most 100 µm and a convergence angle of 5-10°, and provides a water/molten steel ratio of at least 50.
B22F 9/08 - Making metallic powder or suspensions thereof; Apparatus or devices specially adapted therefor using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
Provided is a wound core in which a non-heat-resistant magnetic domain refined material is used for at least a part of materials forming the wound core and which has a better iron loss reducing effect.The wound core has a flat portion and corner portions adjacent to the flat portion, the flat portion including a lap portion, the corner portions including bent portions. A non-heat-resistant magnetic domain refined material is used for at least a part of the materials forming the wound core. Closure domains are formed in the non-heat-resistant magnetic domain refined material so as to extend in a direction intersecting a longitudinal direction of the non-heat-resistant magnetic domain refined material, an area of each of the closure domains in a cross section that is taken in the longitudinal direction being more than 7500 ?m2. In the lap portion, the ratio of the number of lap joint portions having a lap length of from 3.0 mm to 30 mm to the total number of lap joint portions is 50% or more.
An objective of the present invention is to provide a grain-oriented electrical steel sheet having excellent insulating properties. The grain-oriented electrical steel sheet includes a steel sheet and coating films respectively provided on both sides of the steel sheet, wherein an interlayer current value after a friction test is 0.10 A or less. However, the friction test is performed by overlapping two grain-oriented electrical steel sheets and causing the two grain-oriented electrical steel sheets to reciprocate 90 times under the conditions of a surface pressure of 200 Pa, a friction speed of 0.10 m/sec, and a reciprocating stroke of 50 mm.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
Provided are an electric resistance welded steel pipe and a method for manufacturing the same. The present invention is an electric resistance welded steel pipe having a base material section and a welded section, wherein: the steel structure in a central section of the base material section has a bcc phase of 80% or more by volume and has an average crystal grain size of 15.0 ?m or less; the A value represented by equation (1) is 0.55-0.85, inclusive; the yield ratio in the pipe axis direction is 90% or less, and the Charpy absorbed energy of the base material section at ?40°C is 100 J or more. 1: A=?/((??/2)1/2×b)
Provided is a screw joint in which the relationship between a shoulder angle and a screw taper angle is defined to be in a suitable condition for the purpose of avoiding excessive plastic deformation of shoulder surfaces and maintaining and improving performance of the screw joint. This screw joint includes: pins each having a male screw which is a male taper screw and which is provided to the outer circumferential surface of the tip of a first steel pipe; a coupling having female screws which are female taper screws, are configured to be engaged with male screws, and is provided to the inner circumferential surfaces at opposite ends of a second steel pipe. This screw joint is configured such that, when the male screws of the pins are engaged with the female screws at the opposite ends of the coupling, the shoulder surfaces of the tips of the pins come into contact with each other. The relationship between the shoulder angle parameter and the screw taper angle parameter for the coupling and two pins inserted from the opposite ends of the coupling is defined by expression (1), and the screw joint is fastened with a fastening torque which is 60-85% of a yield torque calculated by expression (2). Expression (1): -1.5°=??-??=2.0°
To provide a grain-oriented electrical steel sheet that can achieve both sufficiently low transformer core loss and sufficiently low noise. Disclosed is a grain-oriented electrical steel sheet having a tension coating on a surface thereof and subjected to magnetic domain refining treatment by generating linear closure domains extending in a direction within 30% of a transverse direction, in which an average interval L between adjacent closure domains is 15 mm or less, a depth ratio rd of a depth of the closure domains to a sheet thickness, calculated by a predetermined formula, is 35 % or more, and a volume fraction rv of the closure domains, calculated by a predetermined formula, is 0.30 % or more and 3.0 % or less, and an area ratio rs of the closure domains, calculated by a predetermined formula, is 0.50 % or more and 4.0 % or less.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
37.
METHOD FOR EVALUATING THERMOPLASTICITY OF COAL OR CAKING ADDITIVE
A method for evaluating the thermoplasticity of a coal or a caking additive with an apparatus including a container for coal and a stirrer located in the container, including: estimating a permeation distance of the coal or caking additive from a value indicating a shape of semicoke formed by rotating the stirrer while heating the coal or caking additive and from a correlation between the value indicating the shape of the semicoke and the permeation distance of the coal or caking additive.
G01N 11/14 - Investigating flow properties of materials, e.g. viscosity or plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
A method for preparing a coal, which is used alone or in combination with another coal or other coals, or a caking additive as a raw material for coke production, including: before the coal or caking additive is delivered to a coke plant, adjusting a grain size such that the amount of grains with a grain size of 6 mm or more in the coal or caking additive satisfying at least one of a degree of entanglement, (a - b)/a, of 0.20 or more and a height, a, of 30 mm or more is 30% or less by mass, wherein a denotes a height of semicoke adhering to a stirrer, the semicoke being formed by heating the coal or caking additive in a container while rotating the stirrer, and b denotes a height of the semicoke on an inner wall of the container.
C10B 57/04 - Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
G01N 11/14 - Investigating flow properties of materials, e.g. viscosity or plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
39.
RAIL HAVING EXCELLENT FATIGUE CRACK PROPAGATION RESISTANCE CHARACTERISTICS, AND METHOD FOR PRODUCING SAME
Provided are a rail that exhibits an excellent fatigue damage resistance and in particular excellent fatigue crack propagation resistance characteristics, and a preferred method for producing the rail. The rail has a component composition that contains, on a mass basis, C : 0.80-1.30%, Si : 0.10-1.20%, Mn : 0.20-1.80%, P = 0.035%, S : 0.0005-0.012%, and Cr : 0.20-2.50%, with the balance being Fe and inevitable impurities, and has not more than 2500 for CP = X/RA (wherein X = {(10 x [%C]) + ([%Si]/12) + ([%Mn]/24) + ([%Cr]/21)}5, [%Y] is the content (mass%) of element Y, and RA is the prior austenite grain diameter (µm)). In the rail production method, a steel material is heated to not more than 1350°C and then hot rolled so as to provide a finishing temperature of at least 900°C.
Provided are: a mechanical property measuring apparatus and method that can accurately measure a mechanical property through physical quantities; a substance manufacturing equipment and method that can improve theproduction yield rate. A mechanical property measuring apparatus (100) comprises: a physical quantity measuring unit (5) configured to measure a plurality of physical quantities of a measured object that includes a substanceand a film on a surface of the substance; a classification processing unit (81) configured to select one of a plurality of calculation models (M1, M2, ..., Mn) for calculating a mechanical property of the substance, based on at least twoof the plurality of physical quantities measured; and a mechanical property calculating unit (82) configured to calculate the mechanical property of the substance using the calculation model selected by the classification processing unit (81) and the at least two of the plurality of physical quantities.
B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses
G01N 27/80 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating mechanical hardness, e.g. by investigating saturation or remanence of ferromagnetic material
Provided are: a mechanical property measuring apparatus and method that can accurately measure a mechanical property through physical quantities; a substance manufacturing equipment and method that can improve the production yield rate and high-quality substance. A mechanical property measuring apparatus (100) comprises: a physical quantity measuring unit (5) configured to measure a plurality of physical quantities of a measured object that includes a substance and a film on a surface of the substance; a mechanical property calculating unit (82) configured to calculate, using a plurality of calculation models each for calculating a mechanical property of the substance and at least two of the plurality of physical quantities measured, the mechanical property of the substance for each of the plurality of calculation models; and a selection processing unit (81) configured to select one mechanical property based on the at least two of the plurality of physical quantities.
B21C 51/00 - Measuring, gauging, indicating, counting, or marking devices specially adapted for use in the production or manipulation of material in accordance with subclasses
G01N 27/80 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating mechanical hardness, e.g. by investigating saturation or remanence of ferromagnetic material
Provided are a mechanical property measuring apparatus and method that can accurately measure a mechanical property through physical quantities, etc. A mechanical property measuring apparatus (100) comprises: a physical quantity measuring unit (5) configured to measure a plurality of physical quantities of a measured object that includes a substance and a film on a surface of the substance; a calculation model generating unit (81) configured to select a plurality of pieces of learning data and generate a calculation model for calculating a mechanical property of the substance; and a mechanical property calculating unit (82) configured to calculate the mechanical property of the substance using the calculation model generated and at least two of the plurality of physical quantities, wherein the selection physical quantities include at least one physical quantity measured using a first measurement signal and at least one physical quantity measured using a second measurement signal.
G01N 27/80 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating mechanical hardness, e.g. by investigating saturation or remanence of ferromagnetic material
43.
HARDNESS PREDICTION METHOD OF HEAT HARDENED RAIL, THERMAL TREATMENT METHOD, HARDNESS PREDICTION DEVICE, THERMAL TREATMENT DEVICE, MANUFACTURING METHOD, MANUFACTURING FACILITIES, AND GENERATING METHOD OF HARDNESS PREDICTION MODEL
Thermal treatment of rails having a stable hardness distribution is enabled. The hardness of a rail, obtained by forced-cooling of a rail in the austenite region temperature or higher in a cooling facility (7) is predicted. A plurality of sets of learning data made up of a cooling conditions dataset and output data of hardness was acquired, using a model performing computation with the cooling conditions dataset having at least surface temperature of the rail before starting cooling and the operating conditions of the cooling facility (7) as input data, and the internal hardness of the rail after forced cooling as output data. A hardness prediction model is generated in advance by machine learning using the obtained plurality of sets of learning data, in which the cooling conditions dataset is input data at least, and information relating to internal hardness of the rail after forced cooling is output data. Hardness of the rail is predicted from the internal hardness of the rail as to one set of cooling conditions dataset set as cooling conditions of forced cooling, using the hardness prediction model.
Provided is a linear groove formation pattern by which both a building factor reduction effect and a high magnetic flux density are achieved. This grain-oriented electromagnetic steel sheet has, on a surface thereof, multiple linear grooves extending in a transverse direction to the rolling direction of the steel sheet, wherein: concave defects recessed from the surface are formed on a surface portion of the steel sheet located between the linear grooves, with the volume fraction of the steel sheet resulting from the concave defects to the volume fraction of the steel sheet without the concave defects being 0.0025 vol% to 0.01 vol%; and groove discontinuity parts disrupting the stretch of the linear grooves are formed at a frequency of 30-200 discontinuity parts per 1 m2 of the steel sheet.
H01F 1/147 - Alloys characterised by their composition
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
45.
GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND METHOD OF MANUFACTURING SAME
Provided is a grain-oriented electrical steel sheet which has been subjected to heat-resistant magnetic domain refining treatment and can effectively suppress carburizing and nitriding during stress relief annealing. The grain-oriented electrical steel sheet has a plurality of grooves on one side that extend linearly across the rolling direction and are lined up at intervals in the rolling direction, and has at least a forsterite film on a surface of the steel sheet, where an average thickness of the forsterite film formed on the floor of the grooves is 0.45 µm or more, and a standard deviation ? of the thickness is 0.34 µm or less.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
H01F 1/147 - Alloys characterised by their composition
46.
STEELMAKING LINE AND METHOD OF PRODUCING REDUCED IRON
Provided is an iron manufacturing facility which, when reduced iron is to be manufactured from iron oxide, contributes to the achievement of a method that enables energy conservation and a reduction in the amount of CO2 emissions. The iron manufacturing facility comprises: a blast furnace that reduces iron oxide; a reduction furnace that reduces iron oxide; a methane synthesis device that synthesizes methane from blast furnace gas including hydrogen, carbon monoxide, and carbon dioxide produced as byproducts from the blast furnace and/or furnace top gas including hydrogen, carbon monoxide, and carbon dioxide emitted from the furnace top of the reduction furnace, and hydrogen gas; a blowing device that blows the methane gas synthesized by the methane synthesis device into the blast furnace; a heating reformer that heats or heats and reforms the blast furnace gas and/or the furnace top gas and the methane gas synthesized by the methane synthesis device, and forms a reducing gas containing carbon monoxide gas and hydrogen gas; a reducing gas blowing device that blows the reducing gas into the reduction furnace; and a supply path through which the furnace top gas is supplied to the methane synthesis device and/or the heating reformer.
Provided is a laser machining method that causes no degradation in magnetic properties for thin electrical steel sheets. An electrical steel sheet machining method comprises machining an electrical steel sheet to a predetermined shape by melt-cutting the electrical steel sheet using a laser, wherein a scanning rate of the laser in the melt-cutting is 10000 mm/min or more.
B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
B23K 26/38 - Removing material by boring or cutting
H02K 15/02 - Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
48.
ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR PRODUCING THE SAME
Provided are: an electroseamed steel pipe having high strength and excellent toughness and buckling resistance; and a method for manufacturing same. The electroseamed steel pipe has a base metal part and an electroseamed welded part, wherein: the base metal part has a component composition containing predetermined amounts of C, Si, Mn, P, S, Al, N, Nb, V, and Ti, in mass%, respectively, with the balance being Fe and unavoidable impurities; and a steel structure in the thick-walled central portion of the base metal has at least 70% in total of ferrite and bainite in terms of volume fraction, with the balance comprising at least one or two selected from among pearlite, martensite, and austenite, has an average crystal grain size of 7.0 µm or less, has a dislocation density of 1.0×1014-6.0×1015m-2, and has a magnitude of residual stress in the pipe axial direction on the inner and outer surfaces of the pipe of 150 MPa or less.
B21C 37/08 - Making tubes with welded or soldered seams
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
Provided is an iron-based soft magnetic powder for dust cores that enables production of a dust core having high density and low iron loss. An iron-based soft magnetic powder for dust cores comprises: an iron-based soft magnetic powder; a condensed aluminum phosphate layer on particle surfaces of the iron-based soft magnetic powder; and a silicone resin layer on a surface of the condensed aluminum phosphate layer, wherein the condensed aluminum phosphate layer is a continuous coating, and a total mass of the condensed aluminum phosphate layer and the silicone resin layer is 0.60 mass? or less with respect to 100 mass? of a total mass of the iron-based soft magnetic powder, the condensed aluminum phosphate layer, and the silicone resin layer.
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
50.
ELECTRIC RESISTANCE WELDED STEEL PIPE, METHOD FOR MANUFACTURING THE SAME, AND AUTOMOTIVE STRUCTURAL MEMBER
An electric resistance welded steel pipe having formability and torsional fatigue resistance is provided, and a method for manufacturing the same is provided. An electric resistance welded steel pipe including a seam region and a base metal region, the seam region having a range of ±10 degrees in a pipe circumferential direction with respect to an electric resistance welded seam formed in a pipe longitudinal direction, the base metal region being a region other than the seam region, wherein the electric resistance welded steel pipe has an r-value in the pipe longitudinal direction of 1.0 or greater, H (mm) and W (mm) satisfy formula (1) below, an Ts(max) (mm) and Tb(Ave) (mm) satisfy formula (2) below.H/W.LESS-THAN OR EQUAL TOØ10formula (1)Ts (max) /Tb(Ave) 1.05formula (2)
B21C 37/08 - Making tubes with welded or soldered seams
B21C 37/30 - Finishing tubes, e.g. sizing, burnishing
B21D 5/12 - Bending sheet metal along straight lines, e.g. to form simple curves by drawing procedure making use of dies or forming-rollers, e.g. making profiles for making tubes making use of forming-rollers
An object is to provide a resin-coated metal sheet for containers, on which wrinkle defects are not generated during a post-process heat treatment in can making of two-piece cans that involves a high degree of processing.A resin-coated metal sheet for containers includes a metal sheet and a resin coating layer on each of surfaces of the metal sheet, in which the resin coating layer on at least one surface contains a resin material that contains 90 mol% or more of an ethylene terephthalate unit and that has a mobile amorphous content of 80% or more.
B32B 15/09 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance of synthetic resin comprising polyesters
B65D 25/36 - Coverings or external coatings formed by applying sheet material
52.
METHOD FOR PRODUCING COAL BLEND AND METHOD FOR PRODUCING COKE
Provided are a method for producing a blended coal, said method enabling the production of a blended coal from which a coke having high strength is obtained after dry distillation, and a method for producing a coke.?This method, which is for producing a blended coal by blending a plurality of brands of coals, comprises: by referring the surface tension of coal having an inertinite structure content of 100% by volume to as ?100 and referring the surface tension of coal having a softened and melted structure content of 100% by volume to as ?0, determining the range of ?0 of coal; among the brands of coals 1, 2, - -, i, - - n to be blended in the blended coal, specifying coal i the ?100 of which is out of the range of ?0; then measuring TI of coal i; and setting the blending ratio of coal i so as to give w, which is calculated in accordance with formula (1), of 20.4 % by mass or less.?(1): w=?(xi x TIi) In formula (1); xi represents the blending ratio (% by mass) of coal i; TIi represents the ratio (% by volume) of the inertinite structure contained in coal i; and w represents the ratio by mass (% by mass) of the inertinite structure being out of the range of ?0 of coal in the blended coal.
Provided is a grain-oriented electrical steel sheet having both low iron loss and good magnetostrictive properties, with which a transformer having excellent properties can be manufactured. The grain-oriented electrical steel sheet of the present disclosure has a linear strain region extending linearly in a direction intersecting the rolling direction, where the linear strain region has a region having compressive stress in the rolling direction, and a region adjacent in a rolling direction to the region having compressive stress has a region having tensile stress in the rolling direction.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
54.
METHOD OF OPERATING BLAST FURNACE AND BLAST FURNACE ANCILLARY FACILITY
Provided is a method of operating a blast furnace, including generating a regenerative methane gas using a blast furnace by-product gas, and blowing a blast gas and a reducing agent into the blast furnace from a tuyere, in which the blast gas is oxygen gas, the regenerative methane gas is used as at least part of the reducing agent, and the oxygen gas and/or the regenerative methane gas is preheated before being blown into the blast furnace from the tuyere.
An electric resistance welded steel pipe, and a method for manufacturing the same are provided. An electric resistance welded steel pipe of the present invention has a welded portion that includes a heat-affected zone having a steel microstructure principally including a bainitic ferrite phase and/or a bainite phase. The steel microstructure at half the wall thickness of the heat-affected zone of the welded portion includes a bainitic ferrite phase and/or a bainite phase in a total area ratio of 90% or more relative to the entire microstructure at half the wall thickness of the heat-affected zone of the welded portion. In the steel microstructure located 1 mm in the wall thickness direction below the outer surface of the heat-affected zone of the welded portion, the bainitic ferrite phase and/or the bainite phase has an average grain size of 20 ?m or less. The average grain size of the bainitic ferrite phase and/or the bainite phase located 1 mm in the wall thickness direction below the outer surface of the heat-affected zone of the welded portion is 0.5 times or more and 2 times or less the average grain size of the bainitic ferrite phase and/or the bainite phase at half the wall thickness of the heat-affected zone of the welded portion.
B21C 37/08 - Making tubes with welded or soldered seams
B21C 37/30 - Finishing tubes, e.g. sizing, burnishing
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
According to one aspect of the present invention, provided is a blast furnace operation method characterized in that a high-concentration hydrogen-containing gas which contains at least 80 mol% of hydrogen gas, is blown from a tuyere under certain conditions such as: a condition in which the blowing temperature of the high-concentration hydrogen-containing gas is room temperature to 300 °C, and the blown amount of hydrogen gas in the high-concentration hydrogen-containing gas is 200 Nm3/t to 500 Nm3/t; a condition in which the blowing temperature of the high-concentration hydrogen-containing gas is 300 °C to 600 °C, and the blown amount of hydrogen gas in the high-concentration hydrogen-containing gas is at least 145 Nm3/t; or a condition in which the blowing temperature of the high-concentration hydrogen-containing gas is 600 °C to 900 °C, and the blown amount of the high-concentration hydrogen-containing gas is at least 125 Nm3/t.
Provided is a method of operating a blast furnace, having generating a regenerative methane gas from a by-product gas discharged from the blast furnace, and blowing a blast gas and a reducing agent into the blast furnace from a tuyere of the blast furnace in which the blast gas is oxygen gas and the regenerative methane gas is used as at least part of the reducing agent.
HOT-ROLLED STEEL SHEET FOR ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR MANUFACTURING THE SAME, ELECTRIC RESISTANCE WELDED STEEL PIPE AND METHOD FOR MANUFACTURING THE SAME, LINE PIPE, AND BUILDING STRUCTURE
Provided are a hot-rolled steel sheet for an electric resistance welded steel pipe and a method for manufacturing the hot-rolled steel sheet, an electric resistance welded steel pipe and a method for manufacturing the electric resistance welded steel pipe, a line pipe, and a building structure. The hot-rolled steel sheet for an electric resistance welded steel pipe according to the present invention has a chemical composition containing, by mass%, C: 0.030% or more and 0.20% or less, Si: 0.02% or more and 1.0% or less, Mn: 0.40% or more and 3.0% or less, P: 0.050% or less, S: 0.020% or less, N: 0.0070% or more and 0.10% or less, and Al: 0.005% or more and 0.080% or less, the balance being Fe and incidental impurities, in which N dissolved in a steel is contained in an amount of 0.0010% or more and 0.090% or less, and letting a sheet thickness be t, a steel microstructure at a 1/2t position has an average grain size of 20.0 ?m or less.
B21B 1/22 - Metal rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling bands or sheets of indefinite length
B21C 37/08 - Making tubes with welded or soldered seams
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
A hydrogen supply system is a system configured to supply hydrogen to a fuel-cell vehicle by using a receptacle 4 for hydrogen transport and includes: a filling unit provided at a hydrogen filling facility and configured to fill the receptacle 4 with hydrogen; a management unit configured to calculate a transport timing at which hydrogen-filled receptacle 4 is transported to a business facility that operates the fuel¬ cell vehicle; a transport unit configured to transport hydrogen-filled receptacle 4 to the business facility in accordance with the transport timing; and a disposition unit configured to dispose hydrogen-filled receptacle 4 transported to the business facility at a place to which the fuel-cell vehicle is capable of accessing to have a refill of hydrogen in the business facility.
F17C 13/00 - VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES - Details of vessels or of the filling or discharging of vessels
An electrical steel sheet with a vitreous insulating film and containing a crystalline fibrous material having an aspect ratio of 1.5 or more on a surface of the steel sheet. The content of the crystalline fibrous material is 1.0 mass% or more and 50 mass% or less.in which a ratio (LRD/LTD) of a length in a rolling direction (LRD) of the crystalline fibrous material in a cross section in the rolling direction of the insulating film to a length in a direction perpendicular to the rolling direction (LTD) of the crystalline fibrous material in a cross section in the direction perpendicular to the rolling direction of the insulating film is 1.5 or more and 50.0 or less. This electrical steel sheet provides higher tension in the rolling direction than in a direction perpendicular to the rolling direction and is excellent in terms of film adhesion properties.
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
61.
METHOD FOR ESTIMATING SURFACE TENSION OF COAL AND METHOD FOR PRODUCING COKE
Provided is a method for easily estimating the surface tension of coal.A method for estimating a surface tension of coal includes: subjecting a surface tension, a physical property value representing a coal rank, and a total inert content of each of different brands of coal to multiple regression analysis to determine in advance a regression equation including the surface tension of coal as an objective variable and the physical property value and the total inert content as explanatory variables; and measuring the physical property value and the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal by using the measured physical property value and the measured total inert content, and the regression equation.
Provided is a method for easily estimating the surface tension of coal.A method for estimating a surface tension of coal includes: calculating a relational expression (second relational expression) representing the relationship between the surface tension and the total inert content of a coal from the surface tension of coal inerts estimated based on the coal rank and the surface tension of coal reactives; and measuring the total inert content of a coal of which the surface tension is to be estimated, and calculating the surface tension of the coal by using the measured total inert content and the relational expression.
Provided are an electric resistance welded steel pipe (ERWSP) including a base metal zone (BMZ) and electric resistance welded zone having high strength, excellent toughness, and excellent buckling resistance, a method for producing the ERWSP, a building structure, and a line pipe. The BMZ has a predetermined chemical composition and a steel microstructure including, by volume, ferrite: > 30%, and bainite: 10%. Total volume fraction of ferrite and bainite is 70% to 95%, the balance being one or more phases selected from pearlite, martensite, and austenite. When regions surrounded by boundaries between adjacent crystals having a misorientation of 15° are defined as crystal grains (CGs), the average CG size is < 7.0 pm, and the volume fraction of CGs 40.0 pm is 30%. A compressive residual stress generated in the inner and outer surfaces of the ERWSP in the axial direction is 250 MPa.
In a production of a grain-oriented electrical steel sheet comprising hot rolling a raw steel material containing Si: 2.5 to 4.5 mass%, cold rolling, decarburization annealing, applying an annealing separator composed mainly of MgO, finish annealing and magnetic domain subdividing, the annealing separator to be used includes compounds of Sn, Sb, Mo and W by 0.3 to 5 mass% as converted to a metal, and the finish annealing is conducted by holding the steel sheet at a temperature of 800 to 950°C for 10 to 100 hours under an inert atmosphere and passing a dry gas containing not less than 1 vol% of H2 and having a dew point of not higher than 10°C so as to reach a furnace pressure of not less than 3.5 mmH2O from not lower than 1050°C to a purification treatment temperature, so that a pickling weight loss of undercoat film by pickling with HCl is not more than 1.8 g/m2 and the total concentration of Sn, Sb, Mo, and W on a boundary face between the film and iron matrix is 0.01 to 0.15 mass%, whereby a grain-oriented electrical steel sheet having an excellent film adhesiveness is obtained even when the magnetic domain subdividing treatment is performed at a high energy density.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
65.
BORON NITRIDE POWDER, METHOD OF MANUFACTURING BORON NITRIDE POWDER, RESIN MATERIAL, AND METHOD OF MANUFACTURING RESIN MATERIAL
Provided is a boron nitride powder having excellent adhesion to a resin. The boron nitride powder has a hexagonal structure, has a carboxyl group present on a surface of the boron nitride powder, and has a molar ratio of carboxyl group to nitrogen atom of 0.001 or rnore on a surface of the boron nitride powder.
A rail 1 comprises a foot section 2, a web section 3, and a head section 4. The component composition of the web section 3 includes C: 0.70-1.20 wt%, Si: 0.20-1.20 wt%, Mn: 0.20-1.50 wt%, P: 0.035 wt% or less, and Cr: 0.20-2.50 wt%, with the remainder comprising Fe and unavoidable impurities. The area ratio of pearlite in the web section 3 is 95% or more, and the average size of the pearlite blocks is 60 µm or less.
Disclosed is a non-oriented electrical steel sheet having low iron loss in a frequency range of about 400 Hz. The non-oriented electrical steel sheet comprises an inner layer and surface layers, and has a chemical composition containing: Si; and C: 0.020 mass? or less, Mn: 0.010 mass? to 2.0 mass?, and S: 0.0100 mass? or less, as average contents in the total sheet thickness, with the balance being Fe and inevitable impurities, wherein each of the surface layers has an average Si content [Si]1 of 2.5 mass? to 7.0 mass?, the inner layer has an average Si content [Si]0 of 1.5 mass? to 5.0 mass?, each of the surface layers has an in-plane tensile stress of 5 MPa to 50 MPa, the non-oriented electrical steel sheet has a sheet thickness t of 0.01 mm to 0.35 mm, the surface layers have a total thickness t1 with a ratio t1/t of the total thickness t1 to the sheet thickness t being 0.10 to 0.70, the non-oriented electrical steel sheet has an average N content [N] in the total sheet thickness of 40 ppm or less, and an iron loss W10/400 in W/kg at a maximum magnetic flux density of 1.0 T and a frequency of 400 Hz and the sheet thickness t in mm satisfy the following formula (1):W10/400 ? 8 + 30t ... (1).
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
[Problem] To provide a wear-resistant steel sheet which exhibits high wear resistance at high temperatures from 300°C to 500°C, while having toughness at low temperatures at the same time. [Solution] A steel sheet which has a component composition that contains from 0.10% to 0.23% of C, from 0.05% to 1.00% of Si, from 0.10% to 2.00% of Mn, 0.050% or less of P, 0.050% or less of S, 0.050% or less of Al, from 0.05% to 5.00% of Cr, 0.0100% or less of N and 0.0100% or less of O, while satisfying 1.0 = 0.45Cr + Mo = 2.25, with the balance being made up of Fe and unavoidable impurities, and which has a structure wherein the volume fraction of martensite at the depth of 1 mm from the surface of the steel sheet is 95% or more. With respect to this steel sheet, the Vickers hardness at 400°C is 288 or more and the Brinell hardness at 25°C is from 360 to 490 HBW10/3000 at the depth of 1 mm from the surface of the steel sheet.
Provided is a grain-oriented electromagnetic steel sheet capable of obtaining excellent magnetic characteristics which are stable throughout the entire length of a coil. The grain-oriented electromagnetic steel sheet contains by mass%, 0.005% or less of C, 2.0-4.5% of Si, and 0.01-0.5% of Mn, contains by mass ppm, 20 ppm or less of N, less than 50 ppm of each of Se, Te, and O, less than 30 ppm of S, and less than 40 ppm of acid-soluble Al, and further contains less than 30 ppm of Ti in which acid-soluble Ti is included in an amount of 5-25 ppm, with the remainder comprising Fe and inevitable impurities, wherein the grain-oriented electromagnetic steel sheet has 0.05/mm2 or more of precipitates having a particle diameter of 200 nm or more and containing Ti and N.
C22C 38/04 - Ferrous alloys, e.g. steel alloys containing manganese
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
70.
LINEAR GROOVE FORMATION METHOD AND METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
Provided is a method for forming a linear groove, for forming a linear groove in the surface of a grain-oriented electrical steel sheet or other steel sheet, said method having excellent magnetic flux density and iron loss reducing effect. A method for forming a linear groove, said method having: a resist formation step for forming a resist on the surface of a steel sheet; a laser irradiation step for performing laser scanning in which a laser is radiated while scanning in a direction intersecting with the rolling direction of the steel sheet, and the resist in a portion irradiated by the laser is thereby removed, the laser scanning being performed periodically in the rolling direction of the steel sheet; and an etching step, the resist being removed continuously in the plate width direction of the steel sheet by two or more lasers radiated respectively from two or more laser irradiation devices installed so as to be arranged in the plate width direction, and two lasers radiated respectively from two laser irradiation devices adjacent in the plate width direction being radiated so that the laser centers thereof are offset in a range of 0.05 F to 0.95 F in the direction orthogonal to the laser scanning direction, where F is the spot diameter of the lasers, in the laser irradiation step.
H01F 1/147 - Alloys characterised by their composition
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
Provided is a grain-oriented electrical steel sheet on which a linear groove is formed, said steel sheet being capable of achieving both an excellent iron loss reduction effect and a high magnetic flux density. The grain-oriented electrical steel sheet has, in a direction intersecting with a rolling direction of the grain-oriented electrical steel sheet, a linear groove periodically formed in the rolling direction. The linear groove has a center line discontinuity part where the position of the groove width center line of the linear groove is shifted in the groove width direction of the linear groove, and a and b satisfy the relation indicated by expression (1) given below, where a is the groove width of the linear groove and b is the distance in the groove width direction between the center lines at the center line discontinuity part. Expression (1): 0.05 = b/a = 0.95
H01F 1/147 - Alloys characterised by their composition
H01F 3/02 - Cores, yokes or armatures made from sheets
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
72.
LINEAR GROOVE FORMATION METHOD AND LINEAR GROOVE FORMING APPARATUS, AND METHOD FOR MANUFACTURING GRAIN-ORIENTED ELECTRICAL STEEL SHEET
A linear groove formation method is disclosed that includes comprising: forming a coated resist on a surface of a steel sheet; irradiating laser beams onto the steel sheet while repeating a laser scanning in a direction intersecting a rolling direction of the steel sheet cyclically in the rolling direction of the steel sheet to remove the coated resist in portions irradiated with the laser beams; forming linear grooves by etching portions of the steel sheet from which the resist is removed, wherein, in the irradiating process: the resist is removed by using two or more laser irradiating devices; and an irradiation energy, a beam diameter in a direction perpendicular to a laser scanning direction, and an incidence angle with respect to the surface of the steel sheet of the laser beams are lower than 30 J/m, 10 m or more and 100 m or less, and 20 or less, respectively.
H01F 1/147 - Alloys characterised by their composition
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
73.
METHOD FOR PRODUCING NON-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR PRODUCING MOTOR CORE, AND MOTOR CORE
In the production of a non-oriented electrical steel sheet by subjecting a steel slab having a component composition containing, by mass%, C: not more than 0.0050%, Si: 2.8 to 6.5%, Mn: 0.05 to 2.0%, Zn: 0.0005 to 0.0050% and satisfying Si + Al ? 4 mass% to a hot rolling, a hot-band annealing, a cold rolling and a finish annealing, the conditions of the finish annealing are controlled such that a yield stress of the steel sheet after the finish annealing is not less than 480 MPa. Also, when a motor core is produced by using the above steel sheet, there can be provided a non-oriented electrical steel sheet capable of producing a high strength rotor core and a stator core having excellent magnetic properties after stress-relief annealing as the same raw material where the stator core is subjected to a stress relief annealing at a soaking temperature of 780 to 950°C in an atmosphere having a nitrogen content of not more than 30 vol% and a dew point of not higher than -20°C to suppress nitriding of steel sheet surface, while a motor core is produced with such a steel sheet.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Provided are a grain-oriented electromagnetic steel plate combining low iron loss and low magnetostriction and an advantageous production method therefor. This grain-oriented electromagnetic steel plate comprises a linear distortion section extending in a direction intersecting with a rolling direction. The linear distortion section has a stress distribution wherein compressive stress regions and tensile stress regions are aligned while alternating with one another in the length direction of the linear distortion section. In addition, the linear distortion section is formed by subjecting the steel plate to oscillations in the plate thickness direction when an electron beam is moved and stopped repeatedly in a direction intersecting with the steel plate rolling direction to irradiate the steel plate surface.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
H01F 1/147 - Alloys characterised by their composition
75.
IRON-BASED ALLOY SINTERED BODY AND IRON-BASED MIXED POWDER FOR POWDER METALLURGY
Provided is an iron-based alloy sintered body having a tensile strength of 800 MPa or more, excellent machinability, a microstructure with an average Vickers hardness of 300 Hv or more and 900 Hv or less and a standard deviation of Vickers hardness of 200 Hv or less, and an average pore circularity of 0.30 or more.
B22F 1/05 - Metallic powder characterised by the size or surface area of the particles
B22F 1/10 - Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
C22C 33/02 - Making ferrous alloys by powder metallurgy
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
B22F 3/00 - Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor
A method for manufacturing a motor core according to the present invention includes a step of manufacturing a motor core by performing melt-cutting on an electrical steel sheet using heat input from the surface, the electrical steel sheet having an average thermal conductivity in depth positions from the surface to one third depth of the sheet thickness lower than the thermal conductivity in the middle position in the sheet thickness direction by 30% or greater. It is preferable that the sheet thickness of the electrical steel sheet be 0.20 mm or smaller. It is further preferable that concentrations of Si, Al, and Mn in the depth positions from the surface to one-third depth of the sheet thickness of the electrical steel sheet satisfy predetermined conditions. It is further preferable that the concentration of each constituent for the entire sheet thickness of the electrical steel sheet is C: 0.01% or smaller, Si: 7% or smaller, Al: 4% or smaller, and Mn: 5% or smaller, in mass%.
H02K 15/02 - Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
B23K 26/38 - Removing material by boring or cutting
H02K 1/02 - DYNAMO-ELECTRIC MACHINES - Details of the magnetic circuit characterised by the magnetic material
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
77.
ELECTRIC-RESISTANCE-WELDED STEEL PIPE OR TUBE FOR HOLLOW STABILIZER
Provided is an electric-resistance-welded steel pipe for a hollow stabilizer, which makes it possible to suppress the generation of not only a ferrite decarburization layer but also a total decarburization layer even when heat treatment is performed in the atmosphere and to obtain a hollow stabilizer having excellent fatigue characteristics. The electric-resistance-welded steel pipe for a hollow stabilizer has a prescribed component composition, and the total decarburization depths on the inner surface and the outer surface thereof are 100 µm or less.
Provided is a low-sulfur coal production method having an excellent desulfurization effect. The production method comprises bringing coal into contact with a chemical material that is a mixed solution of hydrogen peroxide and acetic anhydride to remove sulfur in the coal. It is preferred that the molar ratio of the acetic anhydride to the hydrogen peroxide (i.e., (acetic anhydride)/(hydrogen peroxide)) is 0.5 to 12.0 inclusive. It is preferred that the acetic anhydride is mixed with the hydrogen peroxide before the chemical material is brought into contact with the coal and the chemical material is brought into contact with the coal after 10 minutes or more has elapsed since the mixing.
Provided is a method for producing low-sulfur coal having an excellent desulfurization effect. In the production method, coal is brought into contact with a chemical agent that is a mixed solution of hydrogen peroxide and acetic acid to remove sulfur in the coal, wherein the coal that has been brought into contact with the chemical agent is brought into contact with a hydrogen peroxide solution having a temperature of not more than 40°C. It is preferred that the molar ratio of the acetic acid to the hydrogen peroxide ((acetic acid)/(hydrogen peroxide)) is 1.2 to 60.0 inclusive. It is preferred that the acetic acid is mixed with the hydrogen peroxide before the chemical agent is brought into contact with the coal and the chemical agent is brought into contact with the coal after 30 minutes or more has elapsed since the mixing is performed.
A mixed powder for powder metallurgy comprising an iron-based powder and a lubricant. The lubricant consists of a low-melting-point lubricant having a melting point of 86 C or less and a high-melting-point lubricant having a melting point of more than 86 C. The low-melting-point lubricant is an amide, an ester, an amino group, and/or a carboxyl, a percent by mass of the low-melting-point lubricant to total lubricant between 5 and 90. The ratio of a mass of a free lubricant to a mass of a binding lubricant is between 0 and 15, where the binding lubricant is adhering to a surface of the iron-based powder while the free lubricant is not, and an amount of the low-melting-point lubricant contained as the free lubricant is less than 0.10 parts by mass with respect to 100 parts by mass of the iron-based powder.
METAL STRUCTURE EVALUATOR FOR ROLLED STEEL SHEETS, METHOD FOR EVALUATING METAL STRUCTURE OF ROLLED STEEL SHEET, PRODUCTION FACILITY OF STEEL PRODUCT, METHOD FOR MANUFACTURING STEEL PRODUCT, AND METHOD OF QUALITY MANAGEMENT OF STEEL PRODUCT
A rolled steel sheet metal structure evaluation device according to the present invention comprises: a magnetic characteristic measurement unit that measures a magnetic characteristic in at least two different magnetization directions at an evaluation target point on a surface of a rolled steel sheet, by applying a magnetic field in one direction on the surface of the rolled steel sheet and performing, in at least two different magnetization directions, a process to measure the magnetic characteristic at the evaluation target point; and a determination unit that determines the metal structure of the evaluation target point using the magnetic characteristic that was measured by the magnetic characteristic measurement unit.
Provided are a precursor of a positive electrode material with which it is possible to obtain a lithium-ion secondary cell having an excellent discharge capacity and cycle characteristics, and a method for manufacturing the precursor. The precursor is a precursor of a positive electrode material used for a lithium-ion secondary cell, wherein the precursor is at least one substance selected from the group consisting of nickel-manganese composite hydroxides and nickel-manganese composite oxides, the precursor contains nickel and manganese, the ratio of the nickel content relative to the nickel content and the manganese content is 0.45-0.60 inclusive in molar ratio, and the average valence of manganese is below 4Ø
H01M 4/505 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of manganese of mixed oxides or hydroxides containing manganese for inserting or intercalating light metals, e.g. LiMn2O4 or LiMn2OxFy
H01M 4/525 - Selection of substances as active materials, active masses, active liquids of inorganic oxides or hydroxides of nickel, cobalt or iron of mixed oxides or hydroxides containing iron, cobalt or nickel for inserting or intercalating light metals, e.g. LiNiO2, LiCoO2 or LiCoOxFy
An iron-based mixed powder for powder metallurgy comprises: an iron- based alloy powder; and an alloying powder, wherein the iron-based alloy powder contains Mo: 0.2 mass% or more and 1.5 mass% or less, the alloying powder contains a graphite powder and a copper powder, a ratio of a mass of the graphite powder to a total mass of the iron-based alloy powder and the alloying powder is 0.10 mass% to 1.0 mass%, a ratio of a mass of the copper powder to the total mass of the iron-based alloy powder and the alloying powder is 0.5 mass% to 3.0 mass%, and the copper powder has an average particle size of 25 um or less, and a specific surface area of 0.30 m2/g or more.
The purpose of the present invention is to provide: a steel material for line pipes, which is thick, has compression strength necessary for the application to a submarine pipe line, excellent low-temperature toughness and DWTT performance and also has excellent collapse resistance performance, and a method for manufacturing the steel material; and a line pipe which has a required level of compression strength, excellent low-temperature toughness and DWTT performance and also has excellent collapse resistance performance, and a method for manufacturing the line pipe. A steel material for line pipes, which has a specified component composition, and has such a property that the metal structure in a region lying at a depth corresponding to 1/8 of the thickness from the steel material surface has a bainite area fraction of 85% or more, a polygonal ferrite area fraction of 10% or less and a martensitic islands area fraction of 5% or less, the 0.23% compression strength at a position corresponding to 1/8 of the thickness from the steel material surface as determined in a direction vertical to the rolling direction is 340 MPa or more, and the temperature at which the percentage of ductile fracture as determined by a DWTT test becomes 85% or more is -10°C or lower.
Provided is a method for producing a coal mixture, which is a simple method and which can suppress a decrease in coal fluidity better than conventional methods. In this method for producing a coal mixture in which a plurality of types of coal are mixed, formula (1) and formula (2) are satisfied. Formula (2): acalc = 1.2×10-10 (mol/g-coal) In formula (1) and formula (2), acalc is the hydrogen ion release capacity (mol/g-coal) of the coal mixture per unit mass, ai is the hydrogen ion release capacity (mol/g-coal) of a coal i per unit mass, xi is the blending proportion of the coal i blended in the coal mixture, and N is the total number of types of coal contained in the coal mixture.
The present invention provides a method for evaluating whether a coal being evaluated could reduce the strength of coke, the method involving using an apparatus equipped with a stirrer such as a well-known Gieseler plastometer. The coal is evaluated using a Gieseler plastometer 10. A semi-coke 13 is formed from the heated coal in the container 11 of the Gieseler plastometer 10 after measurement of the Gieseler fluidity. The height of the semi-coke 13 on a side wall of the container 11 is designated as b. The height of the semi-coke on 13 the stirrer 12 of the Gieseler plastometer is designated as a. The degree of entanglement (a - b)/a represented by heights a and b, or the height a alone, is used as as an index for evaluating the coal.
G01N 11/14 - Investigating flow properties of materials, e.g. viscosity or plasticity; Analysing materials by determining flow properties by moving a body within the material by using rotary bodies, e.g. vane
87.
ELECTRIC-RESISTANCE-WELDED STEEL PIPE OR TUBE FOR HOLLOW STABILIZER AND METHOD OF MANUFACTURING SAME
Provided is an electric resistance welded steel pipe for hollow stabilizers, which has excellent corrosion fatigue resistance properties. An electric resistance welded steel pipe for hollow stabilizers, which has a component composition comprising, in % by mass, 0.15% or more and less than 0.20% of C, 0.1 to 1.0% of Si, 0.1 to 2.0% of Mn, 0.1% or less of P, 0.01% or less of S, 0.01 to 0.10% of Al, more than 0.05% and 0.1% or less of Ti, 0.0005 to 0.005% of B, 0.0001 to 0.0050% of Ca, 0.0050% or less of N and a remainder made up by Fe and unavoidable impurities, and has such a structure that the cleanliness level is 0 to 0.1% as determined with respect to each of TiS grains each having a grain diameter of 10 µm or more and MnS grains each having a grain diameter of 10 µm or more by a point counting method in accordance with JIS G 0555.
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C22C 38/16 - Ferrous alloys, e.g. steel alloys containing copper
Provided is an iron-based powder for a powder magnetic core, from which a powder magnetic core having a high apparent density and a high green density can be produced. An iron-based powder for a powder magnetic core, which has a largest particle diameter of 1 mm or less, wherein the median value of the degrees of circularity of particles constituting the iron-based powder for a powder magnetic core is 0.40 or more, and the distribution constant in the Rosin-Rammler equation is 0.30 to 90.0 inclusive.
B22F 1/05 - Metallic powder characterised by the size or surface area of the particles
B22F 1/06 - Metallic powder characterised by the shape of the particles
H01F 1/24 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of particles, e.g. powder pressed, sintered, or bound together the particles being insulated
The invention makes it possible to more accurately specify a coal constituting a coal blend that can produce a coke having a desired strength, and the mass ratio of the coal, as compared with the related art. A preparation method for a blended coal, comprises: determining an interfacial tension at which the desired strength is reached from a correlation on the basis of the correlation determined from the strength of a coke produced from the blended coal and a surface tension of the blended coal determined from a surface tension ?100 at which an inert amount is 100%, a surface tension ?0 at which the inert amount is 0%, a blending ratio of each brand of coal in the blended coal, the mass ratio of an inert structure, and the mass ratio of a softening and melting structure; and mixing two or more brands of the coal at a mass ratio ensuring the surface tension at which the desired strength is reached, or a lower surface tension, to prepare the blended coal.
Provided is a technology pertaining to: a metal tube that has a high dimension accuracy without the need of cutting of tube end parts after tube expansion, and that has an outer diameter of 150-3000 mm and a thickness of 2-50 mm; and a manufacturing method for the metal tube. This method includes: a tube end part expansion step for expanding tube end parts 11 at both ends of an element tube 1; and an internal pressure application step for, after the tube end part expansion step until an internal pressure p (MPa) according to a change of an axis pushing amount s (mm) indicating a pushing amount at both ends of the element tube 1 in the tube axial direction with respect to tube endmost sections 12 reaches a preset maximum internal pressure pmax (MPa), expanding the element tube 1 by applying the internal pressure p to the entirety of the inside of the element tube 1, wherein p and s satisfy formula (2): 5×(p/pmax)×(a/200)×L0=s=(p/pmax)×(a/200)×L0. In formula (2), 'a' represents a preset tube expansion percentage (%) and 'a' satisfies 0.30=a=5.0, and L0 represents an average length (mm) of the element tube.
B21D 3/16 - Straightening or restoring form of metal rods, metal tubes, metal profiles, or specific articles made therefrom, whether or not in combination with sheet metal parts of specific articles made from metal rods, tubes, or profiles, e.g. crankshafts, by specially-adapted methods or means
B21D 26/041 - Means for controlling fluid parameters, e.g. pressure or temperature
B21D 26/043 - Means for controlling the axial pusher
The objective of the present invention is to propose welding conditions for forming welded joint portions stably at all times, and with which a difference in the hardness of a flash-butt welded joint portion and a rail base material and an amount of deflection during a bending test lie in an improved range. When a plurality of rail base materials having a component composition containing C: 0.60 to 1.20% by mass, Si: 0.10 to 1.50% by mass, Mn: 0.10 to 1.50% by mass, and Cr: 0.10 to 1.50% by mass, the remainder being Fe and unavoidable impurities, are to be joined by way of a joint portion using flash-butt welding, the flash-butt welding is performed with a welding heat input amount at least equal to 1.50×105 kA2×seconds and at most equal to 4.50×105 kA2×seconds.
B23K 31/00 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups
A blast furnace operation method according to one aspect of the present invention comprises the steps of: previously determining the correlation between a carbon intensity in a reducing gas and a carbon consumption intensity reduction amount Input?C due to the blowing of the reducing gas into a blast furnace for every C/H molar ratio between carbon atom and hydrogen atom in the reducing gas; determining a carbon intensity which becomes equal to or larger than a predetermined target value for the carbon consumption intensity reduction amount Input?C in the reducing gas on the basis of the correlation that has been determined for every C/H molar ratio; and adjusting the blow amount of the reducing gas to be blown into the blast furnace on the basis of the carbon intensity in the reducing gas which had been determined in the proceeding step and the content ratio of carbon in the reducing gas.
The purpose is to provide an electromagnetic steel sheet having an insulation coating film attached thereto, which exhibits excellent coating film detachment resistance during a press processing and is prevented from the aggregation of a coating film onto a mold. An electromagnetic steel sheet having an insulation coating film attached thereto, which comprises an electromagnetic steel sheet and an insulation coating film arranged on at least one surface of the electromagnetic steel sheet, wherein the insulation coating film contains P and Al and contains a complex having an aspect ratio of 1 to 10, wherein the particle diameter of the complex is 10 to 1000 nm and the film thickness of the insulation coating film is 500 to 2000 nm.
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
94.
NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME
When a non-oriented electromagnetic steel sheet is produced by hot-rolling a slab, performing hot-rolled-sheet annealing on the hot-rolled slab, performing cold-rolling to form a cold-rolled sheet with a final sheet thickness, and performing finish annealing on the cold-rolled sheet, the slab containing, by mass%, 0.0050% or less of C, 3.2-5.0% of Si, 2.0% or less of Mn, 0.02% or less of P, 0.0050% or less of S, 0.5-2.0% of Al, and 0.0050% or less of N, and satisfying Si+Al=4.0%, a non-oriented electromagnetic steel sheet is obtained, which has a recrystallization ratio of less than 100% by area ratio by setting the rolling reduction of the finish-rolling final pass in hot rolling to be 10% or more, the winding temperature of a coil to be 620 °C or less, the soaking temperature of the finish annealing to be 600-800 °C, and which has high strength and low iron loss by setting a strength C to be 2.0 or more and a strength difference C-D to be 2.0 or less where the strength at F=0° and f1=0° in a cross-section at f2=45° of ODF obtained from a central layer in the sheet thickness is C, and the strength at F=20° and f1=0° is D.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C21D 9/46 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
Proposed is a non-oriented electrical steel sheet being low in iron loss and excellent in tensile strength and fatigue strength, which has a chemical composition comprising C: not more than 0.005 mass%, Si: 3 to 5 mass%, Mn: not more than 5 mass%, P: not more than 0.1 mass%, S: not more than 0.01 mass%, Al: not more than 3 mass%, N: not more than 0.005 mass%, Zn: 0.0005 mass% to 0.003 mass%, and the remainder being Fe and inevitable impurities, an average crystal grain size being not more than 40 pm, the number of the inclusions having a diameter of not less than 5pm being not more than 5/mm2, a tensile strength being not less than 600 MPa, and the fatigue strength being not less than 450 MPa.
C22C 38/02 - Ferrous alloys, e.g. steel alloys containing silicon
H01F 1/147 - Alloys characterised by their composition
H01F 1/16 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
96.
NON-ORIENTED ELECTRICAL STEEL SHEET AND METHOD FOR PRODUCING SAME
When this non-oriented electrical steel sheet is produced by hot-rolling a slab containing 0.0050 mass% or less of C, 2.8-6.5 mass% of Si, 0.05-2.0 mass% of Mn, 0.10 mass% or less of P, 0.0050 mass% or less of S, 0.3-2.0 mass% of Al, 0.0050 mass% or less of N, and 0.0005-0.0050 mass% of Zn, performing a hot-rolled sheet annealing, performing a cold-rolling, and performing a finish annealing, a dew point during the hot-rolled sheet annealing is set to 0-70°C, and during the finish annealing, the nitrogen content in the atmosphere is set to 30 vol% or less and the dew point is set to -20°C or less. Thus, the ratio of the amount of nitrogen present as AlN in the total sheet thickness to the amount of nitrogen present as AlN in a layer from one side surface of the steel sheet to 1/20 of the sheet thickness is made 5.0 or more, thereby obtaining a non-oriented electrical steel sheet having a high magnetic flux density and a low high-frequency iron loss, without causing a decrease in magnetic flux density and a decrease in productivity.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/14 - Ferrous alloys, e.g. steel alloys containing titanium or zirconium
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
H01F 1/147 - Alloys characterised by their composition
Provided is an electric resistance welded steel pipe in which, despite a carbon content of 0.40% or more, quenching cracks do not occur and which also has excellent fatigue strength. The electric resistance welded steel pipe has a component composition consisting of, in mass%, C: 0.40-0.55%, Si: 0.10-1.0%, Mn: 0.10-2.0%, P: 0.10% or less, S: 0.010% or less, Al: 0.010-0.100%, Cr: 0.05-0.30%, Ti: 0.010-0.050%, B: 0.0005-0.0030%, Ca: 0.0001-0.0050%, and N: 0.0005-0.0050%, the balance being Fe and unavoidable impurities, and the outer surface and the inner surface have ferrite decarburized layers of 20-50 µm depth from the surface.
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C21D 9/50 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for welded joints
C22C 38/38 - Ferrous alloys, e.g. steel alloys containing chromium with more than 1.5% by weight of manganese
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
98.
FERRITIC STAINLESS STEEL SHEET AND METHOD FOR PRODUCING SAME
Provided are: a thick ferritic stainless steel sheet having excellent die-cut properties and excellent corrosion resistance; and a method for manufacturing the ferritic stainless steel sheet advantageously. The ferritic stainless steel sheet has a specified component composition, and the area ratio of crystal grains each having a grain diameter of 45 µm or more is 20% or less in the ferritic stainless steel sheet.
Disclosed is a grain-oriented electrical steel sheet with extremely low iron loss by means of a magnetic domain refining technique. In a grain- oriented electrical steel sheet having a plurality of magnetic domains refined via a local strain introduction portion, when a direct-current external magnetic field is applied to the steel sheet in a rolling direction, for a magnetic flux leaked from the local strain introduction portion at a position 1.0 mm away from a surface of the steel sheet at a side of the local strain introduction portion, a value obtained by dividing an intensity level of a total leakage magnetic flux by an intensity level of a magnetic flux leaked due to causes other than strain is more than 1.2.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
B23K 26/00 - Working by laser beam, e.g. welding, cutting or boring
H01F 1/16 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
100.
DUPLEX STAINLESS STEEL SEAMLESS PIPE AND METHOD FOR MANUFACTURING SAME
The present invention addresses the problem of providing: a duplex stainless seamless steel pipe which has excellent corrosion resistance, high tensile yield strength in the pipe axis direction, and a small difference between the tensile yield strength and the compressive yield strength both in the pipe axis direction; and a method for manufacturing the duplex stainless seamless steel pipe. A duplex stainless seamless steel pipe having a component composition containing, in % by mass, 0.005 to 0.08% of C, 0.01 to 1.0% of Si, 0.01 to 10.0% of Mn, 20 to 35% of Cr, 1 to 15% of Ni, 0.5 to 6.0% of Mo, 0.150% or more and less than 0.400% of N, further containing at least one component selected from Ti in an amount of 0.0001 to 0.3%, Al in an amount of 0.0001 to 0.3%, V in an amount of 0.005 to 1.5% and Nb in an amount of 0.005% or more and less than 1.5%, with the remainder made up by Fe and unavoidable impurities, wherein N, Ti, Al, V and Nb are contained in such a manner that the requirement represented by formula (1) can be satisfied, the tensile yield strength in the pipe axis direction is 757 MPa or more, and the (compressive yield strength in the pipe axis direction)/(tensile yield strength in the pipe axis direction) ratio is 0.85 to 1.15. 0.150 > N-(1.58Ti+2.70Al+1.58V+1.44Nb) (1) In the formula, "N", "Ti", "Al", "V" and "Nb" respectively represent the contents (% by mass) of these elements. (When each of the elements are not contained, the value is 0 (zero) %.)
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
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