WARPED METAL BELT SHAPE ESTIMATION METHOD, METAL BELT ACCEPTANCE DETERMINATION METHOD, METAL BELT MANUFACTURING METHOD, AND WARPED METAL BELT SHAPE ESTIMATION FACILITY
Provided are a warped metal belt shape estimation method, a metal belt acceptance determination method, and a warped metal belt shape estimation device which can estimate a warped shape in a plate width direction in a state where the tension is unloaded, from the warped shape in the plate width direction in a state where the tension in a longitudinal direction is loaded onto the warped shape in the plate width direction generated by rapid cooling of the metal belt. This warped metal belt shape estimation method estimates the warped shape in the plate width direction of the metal belt in an un-tensioned state where the tension is unloaded, from the shape in the plate width direction of the metal belt in a tensioned state where the tension in the longitudinal direction is loaded, wherein the method comprises: a plate width direction shape measurement step for measuring a plate width direction shape distribution of the metal belt in the tensioned state; an approximate curve calculation step for calculating the plate width direction shape distribution, which is measured in the plate width direction shape measurement step, as an approximate curve approximated by a quadratic curve or a circular arc; and a warped shape estimation step for using the plate width direction shape distribution and the approximate curve to estimate the warped shape in the plate width direction of the metal belt in the unloaded state.
Provided are: a water content measurement method capable of reliably measuring a water content of a measured object, even when a layer thickness of the measured object fluctuates; a water content measurement device; and a manufacturing method for coke. The water content measurement method includes: a microwave measurement step of, when transmitted microwaves are transmitted to a measured object S by a microwave transmission unit 11 that moves relative to the measured object S, receiving, by using a microwave reception unit 12, the transmitted microwaves that have passed through the measured object S as received microwaves, and finding the attenuation thereof and the phase difference between the transmitted microwaves and the received microwaves; a bulk density calculation step of calculating an amount of the measured object S, a movement speed of the measured object S relative to the microwave transmission unit 11, and the bulk density of the measured object S on the basis of the layer thicknesses of the measured object S; and a water content calculation step of calculating a water content of the measured object S using the phase difference, the attenuation, and the bulk density measured by a microwave evaluation unit 13.
G01N 9/36 - Analysing materials by measuring the density or specific gravity, e.g. determining quantity of moisture
G01N 22/00 - Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
3.
BULK DENSITY DETECTION METHOD AND DEVICE, WATER CONTENT CALCULATION METHOD AND DEVICE, AND METHOD FOR PRODUCING COKE
Provided are a bulk density detection method and device, a water content calculation method and device, and a method of producing coke that enable highly accurate detection of bulk density without needing to use a special device. This bulk density detection method is for emitting microwaves at an object and detecting the bulk density of the object, said method comprising: a microwave emission step for emitting emission microwaves of each of a plurality of wavelengths at the object; a microwave receiving step for receiving the emission microwaves, having been transmitted through the object, as reception microwaves for each of the plurality of wavelengths; an attenuation amount calculation step for calculating, for each of the plurality of wavelengths, an attenuation amount that is the difference in energy between the emission microwaves and the reception microwaves; a wavelength identification step for extracting a wavelength distribution of the attenuation amounts that is based on a predetermined regular wavelength distribution, with regard to the relationship between the calculated attenuation amounts and the wavelengths corresponding to the attenuation amounts, and also identifying, in the wavelength distribution, a predetermined representative wavelength included in the regular wavelength distribution; and a bulk density detection step for detecting the bulk density of the object on the basis of the identified representative wavelength.
G01N 22/00 - Investigating or analysing materials by the use of microwaves or radio waves, i.e. electromagnetic waves with a wavelength of one millimetre or more
C10B 57/04 - Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition
G01N 9/24 - Investigating density or specific gravity of materials; Analysing materials by determining density or specific gravity by observing the transmission of wave or particle radiation through the material
A press forming fracture determination method according to the present invention involves: (P1) acquiring a metal plate forming limit expressed as a relationship between a maximum principal strain and a minimum principal strain of a test piece 100 stretch-formed using various degrees of bending deformation, and the degree of bending deformation; and (P3) determining the presence or absence of fracture generation in the press formed part on the basis of the acquired metal plate forming limit, the maximum principal strain and the minimum principal strain calculated for the press formed part, and the degree of bending deformation.
Provided is a low-yield-ratio hot-rolled steel sheet having excellent strength and low-temperature toughness. The steel sheet has a predetermined component composition. The steel structure of the sheet thickness center part has a main phase, which is ferrite, and a second phase in which the total area ratio of pearlite and pseudopearlite is 6-25% and the area ratio of upper bainite is 5% or less. When a region surrounded by boundaries where the orientation difference between adjacent crystals is 15° or more is taken as a crystal grain, the average crystal grain size of the steel structure containing the main phase and the second phase in the sheet thickness center part is 10.0-30.0 μm, the area ratio of crystal grains having a crystal grain size within this average crystal grain size±5.0 μm is 35% or more, and the number of crystal grains in which the ratio (major axis)/(minor axis) of the major axis to the minor axis is 3.0 or more is 30/mm2 or fewer.
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
B21C 37/15 - Making tubes of special shape; Making the fittings
C21D 8/02 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of plates or strips
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
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
The purpose of the present invention is to provide a welded member and a method for manufacturing the same. The present invention relates to a welded member in which a sheet set obtained by stacking two or more steel sheets is welded together through resistance spot welding, wherein: the average value of the shortest distance from the center of a welding point to the end surface of the steel sheet is 3.0 mm or greater; if there are a plurality of welding points, then the average distance between the centers of adjacent welding points is 6.0 mm or greater; at least one of the two or more steel sheets has a decarbonated layer on a steel-sheet obverse layer; and, on the steel sheet having the decarbonated layer, the thickness of the decarbonated layer between a base-material part and a welding-heat-affected part satisfies formula (1). (1): tw/tb < 1.0
Provided is a method for producing a hot metal, whereby it becomes possible to achieve high energy efficiency in a melting step when reduced iron is produced from iron ore in a solid reducing furnace and then the reduced iron is melted in a SAF to produce a hot metal. The method for producing a hot metal according to the present invention comprises a step for producing first reduced iron from low-grade iron ore pellets, an optional step for producing second reduced iron from high-grade iron ore pellets, an optional step for producing third reduced iron from lump ore, an optional step for preparing fourth reduced iron, and a step for melting the first reduced iron to fourth reduced iron in a SAF and adding a slag-making material to the resultant product for basicity adjustment purpose, in which the following formula is satisfied. 150.0 ≤ S1×W1+S2×W2+S3 ≤ 400.0, in which S1: the slug ratio of the first reduced iron, W1: the blend ratio of the first reduced iron, S2: the average slug ratio of the second reduced iron to fourth reduced iron, W2: the total blend ratio of the second reduced iron to fourth reduced iron, and S3: the amount of the slag-making material to be added in the melting step.
Provided is a method that is for controlling a warp shape of a metallic band, and that makes it possible to reduce the height of warp in a metallic band on the downstream side of a temper rolling mill by performing control on a warp shape having a W-shaped cross section in the plate width direction or on a warp shape that is approximated by a high-dimensional function. The method for controlling the warp shape of a metallic band is for use in a metallic band manufacturing facility comprising a temper rolling mill 31 for correcting the shape of a metallic band 1 conveyed continuously and a warp shape measurement device for measuring the warp shape of the metallic band, and controls an exit-side warp which is the warp shape of the metallic band 1 on the downstream side of the temper rolling mill 31. The method involves: calculating an approximate curve for the warp shape of the metallic band 1 using an approximation method selected from among parabola approximation, circular arc approximation, and envelope approximation; and setting, on the basis of the calculated approximate curve, operational parameters, for the temper rolling mill 31, capable of reducing the warp height in the exit-side warp shape.
B21B 37/28 - Control of flatness or profile during rolling of strip, sheets or plates
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
B21B 37/38 - Control of flatness or profile during rolling of strip, sheets or plates using roll bending
B21B 38/02 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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
METHOD OF PREDICTING FORM OF WARPING IN METAL STRIP, METHOD OF CONTROLLING FORM OF WARPING IN METAL STRIP, METHOD OF MANUFACTURING METAL STRIP, METHOD OF GENERATING WARPING-FORM PREDICTION MODEL, AND DEVICE FOR CONTROLLING FORM OF WARPING IN METAL STRIP
Provided, for metal-strip continuous-annealing lines that include a cooling zone where metal-strip cooling is carried out and a temper mill in which post-cooling metal-strip form rectification is carried out, is a method of predicting metal-strip warping form, in which the form of metal-strip warping on the entry-side is taken into consideration to enable quick prediction of the form of warping on the exit side. This method of predicting metal-strip warping form is for predicting an exit-side warping form, which is the form of warping in metal strip 1 along the downstream side of a temper mill 40 in a metal-strip continuous-annealing line that includes: heating equipment for heating metal strip; cooling equipment 30 for cooling metal strip 1 that has been heated in a heating zone; the temper mill 40 for rectifying the form of the metal strip 1 that has been cooled with the cooling equipment; and an entry-side warping form measuring device 16 for measuring, between the cooling equipment 30 and the temper mill 40, an entry-side warping form, which is the form of warping in the metal strip along the upstream side of the temper mill. The form of warping on the exit side is predicted on the basis of: the form of warping on the entry side; and at least one among parameters of operation of the temper mill 40.
B21B 37/28 - Control of flatness or profile during rolling of strip, sheets or plates
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
B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
B21B 37/74 - Temperature control, e.g. by cooling or heating the rolls or the product
B21B 38/02 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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
C21D 9/52 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for strips
13.
STEEL SHEET, MEMBER, AND METHODS FOR PRODUCING SAME
The present invention provides a carbonaceous material which is used for the production of a sintered ore, and is capable of preventing troubles in the exhaust gas system caused by exhaust gas processing, the troubles including, for example, the generation of tar in pipes and the occurrence of white smoke in an electric dust collector. This carbonaceous material is a solid fuel for the production of a sintered ore, and has an electrical conductivity of 1.0 × 10-9S/m or more and a volatile content (VM) of 15% or less. In cases where this carbonaceous material is composed of a plurality of kinds of carbonaceous materials, 80% or more of the plurality of kinds of carbonaceous materials have an electrical conductivity of 1.0 × 10-9 S/m or more at 80°C to 200°C, and the weighted average of the volatile contents (VM) is 15% or less.
Provided is a method for recovering nickel, cobalt, and manganese from a compound including metal oxides of nickel, cobalt, and manganese in which the concentration of manganese in recovered materials is kept low while increasing the concentrations of nickel and cobalt. The method for recovering nickel, cobalt, and manganese includes: a mixing step in which a reducing agent and a compound containing metal oxides of nickel, metal oxides of cobalt, and metal oxides of manganese are mixed and a mixture is produced; and a heating step in which the mixture is heated to obtain a first product and a second product having a higher concentration of manganese than the first product. In the mixing step, one or more substances selected from among carbon reducing agents containing carbon as a component thereof, silicon reducing agents containing silicon as a component thereof, and aluminum reducing agents containing aluminum as a component thereof are used as the reducing agent, and the reducing agent is used in an amount satisfying a predetermined range.
When a steel slab containing, in mass%, 0.0050% or less of C, 2.0-5.0% of Si, 0.2-1.8% of Mn, 0.5-2.5% of Al, 0.001-0.100% of Mo, and 0.02-0.10% in total of Sn and Sb, the contents of Si, Al and Mn satisfying a predetermined relationship, is hot-rolled, hot roll-annealed, cold-rolled, and finish annealed to manufacture a non-oriented electromagnetic steel plate, the soaking temperature in the finish annealing is set to 500°C or higher and below a temperature T determined from the contents of Si, Al and Mn, the time to maintain the soaking temperature is set to 60 seconds or less, and the residence time at 500°C or higher is set to 100 seconds or less to yield a tensile strength of 700-950 MPa and a dislocation density at the center of the plate thickness of at least 1.2×1014m-2, thereby providing a non-oriented electromagnetic steel plate having high strength after finish annealing and having low core loss after strain relief annealing.
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 are: a steel sheet and a member that have tensile strength of at least 780 MPa, excellent press-moldability, ductility, and expansion flange moldability, and excellent material stability in a sheet width direction; and a method of manufacturing the steel sheet and the member. The present invention has a component composition and a steel structure with prescribed ranges. The combined surface modulus of quenched martensite and residual austenite with an aspect ratio of 3 or less and a circle-equivalent diameter of at least 2.0 μm, with respect to the total surface modulus of quenched martensite and residual austenite, is 20% or less. The surface modulus of a carbon-concentrated region where the carbon concentration is at least 0.5% by mass is 20% or less with respect to the entire structure.
Provided is a method for producing an iron ore pellet, whereby it is possible to obtain a high-strength green pellet in which bursting can be suppressed. This method for producing an iron ore pellet is characterized by having a step for mixing a binder and iron ore having a total Fe content of 63% by mass to obtain a mixture, a step for granulating the mixture to obtain a green pellet, and a step for firing the green pellet to obtain an iron ore pellet, the iron ore having a core ore 10 having a grain size of more than 1 mm, and a fine ore 12 having a grain size of 1 mm or less.
ENERGY OPERATION ASSISTANCE SYSTEM, INFORMATION PROCESSING DEVICE, DISPLAY TERMINAL DEVICE, ENERGY OPERATION ASSISTANCE METHOD, AND STEEL MILL OPERATION METHOD
2222222 optimization unit. Further, a display terminal device is provided with an information acquisition unit, an information display unit, and an output unit.
Provided is a high strength electric resistance welded pipe having excellent SSC resistance. This electric resistance welded pipe has an absolute value of residual stress in the circumferential direction of the pipe inner surface of 10 MPa or more and an absolute value of residual shear stress of the pipe inner surface of 300 MPa or less. The steel structure of a base material portion of the electric resistance welded pipe at the center in the thickness direction is configured such that the total of ferrite and bainite is at least 90% in terms of volume ratio, and the average crystal grain diameter is 9.0 μm or less. The steel structure at a position 0.1 mm outside of the pipe inner surface of the base material portion in the pipe radial direction is configured such that the total of ferrite and bainite is at least 95% in terms of volume ratio.
C22C 38/06 - Ferrous alloys, e.g. steel alloys containing aluminium
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
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
B21C 37/30 - Finishing tubes, e.g. sizing, burnishing
A method for manufacturing a press-molded article 1 provided with at least a top plate portion 3 having a concave curved portion in a side view and a longitudinal wall portion 7 connecting from the top plate portion 3 through a punch-shoulder-radiused portion 5, the method comprising: a first molding step for press-molding an intermediate molded article 19 having an intermediate top plate portion 21 that curves in the same direction as the top plate portion 3, a step-shaped portion 17 that comprises a step formed continuous with a ridge portion 23 formed in an area corresponding to the punch-shoulder-radiused portion 5, and an outward surface portion 25 that extends outward continuous from the step-shaped portion 17 and curves in the same direction as the intermediate top plate portion 21; and a second molding step for press-molding the intermediate molded article 19 into a press-molded article 1.
Provided is a steel cast slab that contains from 2.0 mass% to less than 7.5 mass% of Ni and has few surface cracks. The steel cast slab containing Ni is composed of, in mass%, C: 0.03% to 0.10%, Si: 0.01% to 0.50%, Mn: 0.10% to 1.00%, P: 0.001% to 0.010%, S: 0.0001% to 0.0050%, Ni: 2.0% to less than 7.5%, Al: 0.010% to 0.080%, N: 0.0010% to 0.0050%, and O: 0.0005% to 0.0040%, with the remainder comprising Fe and unavoidable impurities. The density of solidified nuclei in the surface of the steel cast slab is 0.35/mm2 or more.
Provided is a tundish for continuous casting that enables the purity of molten steel to be increased. This tundish for continuous casting comprises an accommodation section that retains molten steel that has been supplied. The accommodation section comprises: one or more molten steel outflow ports out of which the molten steel is allowed to flow; and a weir that is disposed more to the upstream side of the molten steel than the one or more molten steel outflow ports and that is formed in a hollow cylindrical shape. The weir includes: a base section; a wall section erected from the base section; an eave section disposed so as to cover the peripheral ridge at one end of the wall section and to oppose the base section of the weir; and a gas supply section that supplies an inert gas into an internal space surrounded by the wall section and the base section. The gas supply section includes: a porous section, in the entirety of which a plurality of pores are formed; a support section that supports the porous section and is disposed in the wall section of the weir; and piping that is disposed in the wall section of the weir, between the support section and the base section of the weir, and that discharges the inert gas.
Provided is a tundish for continuous casting that is capable of improving the cleanliness of molten steel. This tundish for continuous casting includes an accommodating portion for storing supplied molten steel. The accommodating portion includes: one or a plurality of molten steel outflow ports allowing the molten steel to flow out; and a gas supply portion which is disposed further upstream, in the direction of flow of the molten steel, than the one or plurality of molten steel outflow ports, and which supplies an inert gas into a space surrounded by the accommodating portion. The gas supply portion comprises: a porous portion which is formed in the shape of a box having a bottom portion and a wall portion, and which has a plurality of pores formed over the entirety thereof; a supporting portion which supports the porous portion and which is provided in the wall portion of the gas supply portion; and piping which is provided in the wall portion of the gas supply portion between the supporting portion and the bottom portion of the gas supply portion, and which ejects the inert gas.
SINTERING PROCESS CONTROL METHOD, OPERATION GUIDANCE METHOD, SINTERED ORE MANUFACTURING METHOD, SINTERING PROCESS CONTROL DEVICE, OPERATION GUIDANCE DEVICE, SINTERING OPERATION GUIDANCE SYSTEM, AND TERMINAL DEVICE
Provided is a sintering process control method which uses a physical model, which can calculate the state of a sintering process including a temperature distribution of a sintering raw material in the longitudinal direction and thickness direction in a sintering machine, to control the sintering process, wherein the sintering process control method comprises: a first prediction step (S2) for using the physical model to obtain first future predicted values of control variables when the current operation variables are maintained; and an operation amount calculation step (S5) for calculating an operation amount of a specific operation variable so as to reduce the difference between target values and overlapping predicted values of the control variables, which are based on the first predicted values and a step response when specific operation variables, which are a portion of the operation variables, are changed by a unit quantity.
Provided is a method that makes it possible to more easily and quantitatively obtain the surface wettability of a solid with respect to a discretionary liquid. The present invention is a method for evaluating the wettability of solid surfaces in which surfaces to be evaluated in two solids are made to face each other with a space therebetween, at least all of the bottom edge sections of the two solids are arranged so as to be present on the same plane and the result is used as a test material, an immersion test is performed in which the test material is immersed in an evaluation liquid so that all of the bottom edge section of the test material is parallel to the surface of the evaluation liquid, a wetting height which is the difference between the height of the surface of the evaluation liquid and the height of the liquid surface of the evaluation liquid entering into a gap between the two solids is measured at a discretionary immersion time, and the measured value is designated as a wettability evaluation value for the solid surfaces with respect to the evaluation liquid.
Provided is a mixed powder for powder metallurgy that uses a fatty acid amide, which is a clean lubricant, and that exhibits excellent compression properties and removability of a molded article, not only at normal temperatures but also after a rise in mold temperature. The mixed powder for powder metallurgy comprises an iron-based powder and a fatty acid amide as a lubricant, wherein: the fatty acid amide includes a saturated fatty acid bisamide, a saturated fatty acid monoamide, and an unsaturated fatty acid amide; the unsaturated fatty acid amide includes an unsaturated fatty acid bisamide and/or an unsaturated fatty acid monoamide; and when the added amounts of the saturated fatty acid bisamide, the saturated fatty acid monoamide, the unsaturated fatty acid bisamide, and the unsaturated fatty acid monoamide in terms of parts by mass with respect to 100 parts by mass of the iron-based powder are represented as b1, b2, b3, and b4, respectively, the following expressions (1) to (3) are satisfied. (1): 0<(b1)+(b2)+(b3)+(b4)≤2.0 (2): 0<(b1)/(b2)<0.45 (3): 0<[(b3)+(b4)]/[(b1)+(b2)+(b3)+(b4)]≤0.35
B22F 1/10 - Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
B22F 1/00 - Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
B22F 1/105 - Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing inorganic lubricating or binding agents, e.g. metal salts
Provided are: a laser welding method to prevent cracks and obtain welded joints having excellent weld metal toughness; and a laser welded joint. This laser welding method comprises: butting steel material members together; coating the surface of the steel material including a weld line with a flux having a predetermined composition; and then performing laser welding to create a welded joint, wherein the steel material has a chemical composition containing, in mass%, 0.04-0.15% of C, 0.05-1.00% of Si, 0.50-2.50% of Mn, 0.030% or less of P, 0.020% or less of S, 0.050% or less of Al, 0.050% or less of Ti, 0.010% or less of O, and 0.008% or less of N, with the remainder comprising Fe and inevitable impurities, and having a carbon equivalent Ceq of 0.30-0.45 as expressed by equation (1). (1): Ceq=[C]+[Mn]/6+[Si]/24+[Cu]/20+[Ni]/40+[Cr]/5+[Mo]/4
Provided is a square steel pipe having excellent buckling resistance. In this square steel pipe, which has a plurality of flat portions and corner portions alternating in the pipe circumference direction, the yield strength of the flat portions in the pipe circumference direction is set to be 0.83-1.20 times the yield strength of the flat portions in the pipe axial direction, and the yield strength of the corner portions in the pipe circumference direction is set to be 0.90-1.30 times the yield strength of the flat portions in the pipe axial direction.
Provided is a resin-coated metal sheet that achieves slipperiness, scrape resistance, and ink adhesiveness with respect to a resin coating layer. This resin-coated metal sheet 1 comprises a resin coating layer 3 that is formed on at least one surface of a metal sheet 2, and that contains at least 75% by mass of a polyester resin in relation to the total resin content. The resin coating layer 3 has at least a three-layer structure including a topmost layer 3a, a middle layer 3b, and a bottommost layer 3c. The melting point of the resin coating layer 3 is 230°C to 254°C, inclusive. The topmost layer 3a contains a polyolefin. The melting point of the polyolefin is 80°C to 140°C, inclusive. When measured by Raman spectroscopy, the dispersed particle size of the polyolefin on the topmost surface and the interior in the thickness direction of the resin coating layer 3 is 0.018 µm to 5.0 µm, inclusive.
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
Provided is a resin-coated metal plate for a container, in which breakage of a resin coating layer in can making, and planing of the resin coating layer due to insufficient ability to slide during can making can be suppressed, and the plate has excellent adhesion to printing paint after can making. A resin-coated metal plate 1 for a container comprises a polyester resin coating layer 3 on at least one surface of a metal plate 2, the polyester resin coating layer 3 containing 0.010-1.0 mass% of an organic lubricant in which the half-value width of a peak due to C=O stretching vibration in the vicinity of 1730 cm-1is 24 cm-1to 28 cm -1, determined by laser Raman spectroscopy analysis from measurement with linearly polarized laser light having a wavelength of 532 nm incident on the surface of the polyester resin coating layer 3 with the plane of polarization of the laser light parallel to the rolling direction of the metal plate, and the contact angle of diiodomethane on the surface of the polyester resin coating layer after heat treatment for two minutes from room temperature to 240°C being 23-40°.
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
33.
STEEL SHEET FOR HOT PRESSING, HOT-PRESSED MEMBER AND METHOD FOR PRODUCING HOT-PRESSED MEMBER
Provided is a steel sheet for hot pressing that has excellent rapid heating compatibility, that can prevent liquid metal embrittlement cracking, and that has excellent post-hot-pressing coating adhesion. The steel sheet for hot pressing comprises: a base steel sheet; and a coating layer which is provided on both surfaces of the base steel sheet and which has a thickness of 0.5 to 6.0 µm. The coating layer is formed of Ni or an Ni-based alloy, and the Zn content in the coating layer is 0-30 mass%.
C23C 14/16 - Metallic material, boron or silicon on metallic substrates or on substrates of boron or silicon
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
C25D 5/26 - Electroplating of metal surfaces to which a coating cannot readily be applied of iron or steel surfaces
C25D 5/48 - After-treatment of electroplated surfaces
34.
HIGH-STRENGTH HOT-DIP-GALVANIZED STEEL SHEET AND PRODUCTION METHOD FOR SAME
According to the present invention, a method for producing a high-strength hot-dip-galvanized steel sheet that has at least 20 g/m2but no more than 120 g/m222 and 0.5–10.0 vol ppm of HCl, the remainder being nitrogen and unavoidable impurities. (1): Dew point X≥(-50+[Si mass%]×(T-600)/30+[Mn mass%]×(T-600)/25)
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
A method for producing a grain-oriented electromagnetic steel sheet, the method comprising hot-rolling a steel material having a given composition, cold-rolling the hot-rolled sheet to obtain a cold-rolled sheet having a final sheet thickness, and subjecting the cold-rolled sheet to decarburization annealing serving also as primary recrystallization annealing and then to finish annealing, wherein the cold-rolling includes final cold rolling conducted by at least one pass at a steel sheet temperature in the range of 150-350°C. The decarburization annealing is conducted such that in the course of temperature rising, the cold-rolled sheet is rapidly heated from 400°C to a temperature T (°C) between 700°C and 900°C at an average heating rate of 250 °C/s or higher and that a time period of 0.10 s or longer but shorter than 1.00 s is set during which the heating rate for any temperatures between 500°C and 700°C is not higher than 2/3 the average heating rate. Thus, a grain-oriented electromagnetic steel sheet having excellent magnetic properties is produced. The rapid heating in the decarburization annealing is conducted using a transverse-type induction heater.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
A method for producing a grain-oriented electromagnetic steel sheet, the method comprising: hot-rolling a steel material to obtain a hot-rolled sheet; subjecting the hot-rolled sheet to cold rolling once or subjecting the hot-rolled sheet to cold rolling two or more times and to process annealing interposed therebetween, thereby obtaining a cold-rolled sheet having a final sheet thickness; and subjecting the cold-rolled sheet to decarburization annealing serving also as primary recrystallization annealing and then to finish annealing. The decarburization annealing is conducted such that in the course of temperature rising, the cold-rolled sheet is rapidly heated from 400°C to a temperature T (°C) between 700°C and 900°C at an average heating rate of 250 °C/s or higher and that a time period of 0.10 s or longer but shorter than 1.00 s is set during which the heating rate for any temperatures between 500°C and 700°C is not higher than 2/3 the average heating rate. Thus, a grain-oriented electromagnetic steel sheet having excellent magnetic properties is produced. The rapid heating in the decarburization annealing is conducted using a transverse-type induction heater.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
This press-formed product manufacturing method includes: a reference press-formed product shape acquisition step for acquiring a reference press-formed product shape 5; a corrugated blank press-formed product shape acquisition step for acquiring a corrugated blank press-formed product shape 9; a first deviation amount acquisition step for obtaining a deviation amount between the reference press-formed product shape 5 and the corrugated blank press-formed product shape 9; a period-shifted corrugated blank press-formed product shape acquisition step for acquiring a period-shifted corrugated blank press-formed product shape 13; a second deviation amount acquisition step for obtaining a deviation amount between the reference press-formed product shape 5 and the period-shifted corrugated blank press-formed product shape 13; a countermeasure-requiring site identification step for identifying a countermeasure-requiring site; a convex pattern imparting step for imparting a convex pattern 23, 27 to an actual mold; and an actual press-forming step for performing press-forming using the actual mold to which the convex pattern 23, 27 has been imparted.
Provided is an iron ore pellet production method with which both suppression of bursting and strength of an iron ore pellet are achieved. This iron ore pellet production method involves a crystalline water removal treatment step for eliminating crystalline water from iron ore having an iron content ratio of 63% by mass or less to obtain dewatered ore, wherein iron ore in a state of being heated to 100°C-800°C is kept for 5-200 minutes in the crystalline water removal treatment step.
Provided are a method for producing an iron-based soft magnetic composite powder and an iron-based soft magnetic composite powder. The method for producing an iron-based soft magnetic composite powder includes a first mixing step that adds an aluminum dihydrogen tripolyphosphate dihydrate powder to an iron-based soft magnetic powder and stirs and mixes to obtain a first composite powder in which a coating layer of aluminum dihydrogen tripolyphosphate dihydrate has been formed on the surface of the iron-based soft magnetic particles. In the spectrum of the aluminum dihydrogen tripolyphosphate dihydrate powder analyzed by x-ray diffraction, the peak intensity of the (112) plane of the aluminum dihydrogen tripolyphosphate dihydrate is 1.5 times or more the peak intensity of the (102) plane of aluminum orthophosphate.
This method of controlling hot finish rolling is for hot finish rolling coordinated control that controls a rolling state by finding a control gain that will minimize an evaluation function, by using the evaluation function that has a weight gain set for each of a plurality of state variables and a plurality of operation amount variables. The method comprises: a step in which a normalizing means normalizes the weight gains; a step in which a comparative evaluation means comparatively evaluates the normalized weight gains of the state variables and also comparatively evaluates the normalized weight gains of the operation amount variables; and a step in which a gain adjusting means adjusts the weight gain of a state variable and/or the weight gain of an operation amount variable on the basis of the results of the comparative evaluations.
Provided is a high-strength galvanized steel sheet having a yield strength of 1000 MPa or higher and having exceptional workability, impact resistance, and crack arrestability. The amount of diffusible hydrogen in the steel sheet is 0.60 mass ppm or less. The steel sheet has a component composition containing, in terms of mass, 0.150-0.450% of C, 0.50-3.00% of Si, 1.50-4.00% of Mn, 0.100% or less of P, 0.0200% or less of S, 0.100% or less of Al, 0.0100% or less of O, and 0.0100% or less of N, the balance being Fe and unavoidable impurities. The steel sheet has a microstructure in which the total area ratio of tempered martensite and bainite is 55-95%, the area ratio of retained austenite is 5-30%, and the abundance ratio X/Y between structures X having a nanohardness of 7.0 GPa or higher and structures Y having a nanohardness of 6.5 GPa or lower is 0.5-2.5.
Provided is a high strength steel sheet which has a yield strength of 800 MPa or more and exhibits excellent workability, collision yield strength, and crack-stopping properties. The diffusible hydrogen amount in the steel is 0.50 ppm by mass or less. The constituent composition of the steel contains, in terms of mass%, 0.150-0.500% of C, 0.01-3.00% of Si, 1.50-4.00% of Mn, 0.100% or less of P, 0.0200% or less of S, 0.100% or less of Al, 0.0100% or less of N and 0.0100% or less of O, with the remainder comprising Fe and unavoidable impurities. The total areal ratio of tempered martensite and bainite is 55-95%. The existence ratio (A/B) of a structure A having a nanohardness of 7 GPa or more and a structure B having a nanohardness of 6 GPa or less is 0.8-2.5. The solid solution carbon concentration in retained austenite is 0.50-0.90 mass%.
Provided is a process control method, a blast furnace operation method, a molten pig iron production method, and a process control apparatus, which are for achieving suppression of variability in molten pig iron temperature while reducing a reduction material ratio in a blast furnace. This process control method comprises: a response prediction step for determining a predictive value of a future molten pig iron temperature by using a physical model with which it is possible to calculate the internal state of a blast furnace; and a manipulation degree determination step for determining the deviation between a target value and the predictive value of the molten pig iron temperature determined in the response prediction step, and determining the degrees by which a fine powdered coal ratio and a blown air moisture are to be manipulated, so as to minimize or maximize an evaluation function having a term corresponding to the deviation and a term for reducing a reduction material ratio or the blown air moisture.
Disclosed is a component for solid oxide fuel cells that is excellent in both electrical conductivity and chromium poisoning resistance. As a substrate, a ferritic stainless steel having a chemical composition containing, in mass%, Cr: 14.0 % to 32.0 % and Al: 2.50 % to 7.00 % is used. Precious metal particles are coated on a surface of the substrate. The precious metal particles have: an average particle size of 1 μm or more and 10 μm or less; a coating thickness of 0.5 μm or more and 10 μm or less; and a surface coverage of 1.0 % or more.
Provided is a method for producing a pellet, the method being capable of suppressing green pellet bursting. This method for producing an iron ore pellet comprises: a crushing step for obtaining ore powder by crushing iron ore having an iron content of 63 mass% or less. The volatile content of the iron ore is 3.3 mass% or greater. The iron ore powder has a cumulative 90% diameter in the grain size distribution by volume of 150 μm or less and a grain size distribution index based on the harmonic mean diameter of 14,700 to 510,000.
This method for manufacturing a press-molded article 1 is a method for manufacturing a press-molded article 1 having a main body part 11, which has a top plate part 5 and vertical wall parts 7 formed with ridgeline parts 9 interposed therebetween, and an outer flange part 3 formed on an end of the main body part 11 so as to be continuous from the top plate part 5, the ridgeline parts 9, and the vertical wall parts 7, the method including: an intermediate molding step for molding an intermediate molded article 24 that has the top plate part 5 and the vertical wall parts 7 formed with the ridgeline parts 9 interposed therebetween and that has a step formation part 27 at a root section of an outward-flange-equivalent part 25 so that the outward-flange-equivalent part 25 bulges outwards; and a target shape molding step for folding the outward-flange-equivalent part 25 of the intermediate molded article 24 outwards, forming an outward flange part 3, and molding a target shape.
Provided are a method for controlling a process, a method for operating a blast furnace, a method for manufacturing molten metal, and a device for controlling a process that make it possible to highly accurately predict, and control, the state of a blast furnace. In this method for controlling a process: the pig iron production speed, the gas permeability, and the hot metal temperature of a blast furnace are acquired by means of observed values or calculated values; and the pig iron production speed, the gas permeability, and the hot metal temperature are simultaneously controlled on the basis of the acquired observed values or calculated values, as well as a target value for the hot metal temperature (target hot metal temperature), a target value for the pig iron production speed (target pig iron production speed), and a management value for the gas permeability (furnace interior pressure loss upper limit).
Provided is an electromagnetic steel strip friction stir welding method that can, under high processing efficiency, suppress fracturing of a coil weld section on a manufacturing line, said fracturing being due to degradation in the shape or degradation in the mechanical properties of the coil weld section. Later-cooling-style double-sided friction stir welding is performed according to conditions such that the respective steel compositions of a weld section and a thermal process-affected section that are formed due to the welding will be ferrite phase-based compositions and simultaneously satisfy expressions (1)-(4).
B23K 20/12 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
Provided is a friction stir joining method which is for an electromagnetic steel strip and which, while having a high working efficiency, is capable of preventing a coil joining section in a manufacturing line from breaking due to the deterioration of mechanical characteristics and the deterioration of the shape of the coil section. Post-cooling-type two-surface friction stir joining is performed under a condition satisfying both the relationships of formulas (1) and (2).
B23K 20/12 - Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
Provided are manufacturing equipment, a manufacturing method, and an acceptability determination method for a metal band by which it is possible to reliably perform quality assurance regarding the warpage of a metal band. The manufacturing equipment for a metal band comprises: a heating unit (6) that continuously heats a metal band being conveyed; a cooling unit (8) that cools the metal band heated by the heating unit; a shape correction unit (13) that corrects the shape of the metal band cooled by the cooling unit; a first warpage measurement unit (14) that is disposed downstream of the shape correction unit, and that measures the warpage of the metal band; and a warpage determination unit (41) that determines the position information of the metal band in relation to the front end, and determines the correlation between the warpage of the metal band measured by the first warpage measurement unit and the position information of the metal band in relation to the front end.
Provided is an annealing facility which more actively controls carbon in steel, thereby contributing to further improvement of magnetic properties. This annealing facility has a heating zone, a soaking zone, and a cooling zone on a steel strip conveyance line, wherein: the conveyance line can pass a steel strip having a thickness of 2.8 mm or greater; the soaking zone has a means for maintaining the ambient temperature at 900°C or greater; the cooling zone has a means for supplying a refrigerant to the steel strip to set the average cooling rate in a temperature range of 750°C to 120°C to at least 50°C/s; and a means for removing the refrigerant is provided on the outlet side of the cooling zone.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
A method for producing a grain-oriented electromagnetic steel sheet, the method preventing a break during cold rolling when a grain-oriented electromagnetic steel sheet is produced by subjecting a steel slab, which contains, in mass%, 0.03% to 0.08% of C, 2.0% to 5.0% of Si, 0.005% to 1.0% of Mn, less than 0.010% of Al, 0.006% or less of N and 0.0060% or less of O, while containing S and Se within the range where (S + 0.405 × Se) is 0.0015% to 0.0060%, to hot rolling, hot rolled sheet annealing, cold rolling, decarburization annealing that doubles as primary recrystallization annealing, and subsequent finish annealing, by performing at least two consecutive passes of rolling within the temperature range of 1050°C to 1150°C during the hot rolling, and setting the inter-pass time between the two passes to 60 s or less, the draft of each pass to 20% or more, and the strain rate to 15 s-1 or more; and a hot rolled sheet which is used for this production method.
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 stainless steel sheet which is for a fuel cell separator and has excellent press workability and Fe ion elution resistance. The stainless steel sheet has a composition containing, in mass%, 18.0-24.0% of Cr and 3.00% or less of Ni, has a steel microstructure containing an austenitic phase and a ferritic phase, the fraction of the austenitic phase being at least 30% and the total fraction of the austenitic phase and the ferritic phase being at least 95%, and has a total elongation of at least 40%.
A granular metal production device with which it is possible to make molten metal into granular metal of a predetermined grain size or less even if the height is restricted. The molten metal in a first flow path (9) collides with a step (11) at the inlet of a second flow path (10) created by a difference in opening area, causing rapid speed fluctuations to occur, when molten metal flows from the upper first flow path (9) into the lower second flow path (10) in a discharge port (4) provided in the bottom (3a) of a container (3). As a result, a speed distribution of the flow speed occurs within the cross-section of the molten metal flowing down from the second flow path (10), and this speed distribution allows the molten metal that collides with the collision structure (5) and scatters to be reliably granulated.
B22D 5/00 - Machines or plants for pig or like casting
B22D 23/00 - Casting processes not provided for in groups
B22D 25/02 - Special casting characterised by the nature of the product of works of art
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
This cold-rolling method includes a calculation step for calculating the levelling amount of a rolling machine using the out-of-plane deformation amount of a steel sheet measured on the upstream side of the rolling machine, a control step for controlling the levelling of the rolling machine on the basis of the levelling amount calculated in the calculation step, and a cold rolling step for cold-rolling the steel sheet using the rolling machine controlled in the control step.
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
B21B 37/28 - Control of flatness or profile during rolling of strip, sheets or plates
B21B 37/68 - Camber or steering control for strip, sheets or plates, e.g. preventing meandering
B21B 38/02 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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
58.
PRESS FORMING ANALYSIS METHOD, PRESS FORMING FRACTURE DETERMINING METHOD FOR PRESS-FORMED ARTICLE, PRESS-FORMED ARTICLE MANUFACTURING METHOD, PRESS FORMING ANALYSIS DEVICE, AND PRESS FORMING ANALYSIS PROGRAM
A press forming analysis method according to the present invention includes a blank model creating step (S1) for creating a blank model, and a press forming analysis step (S2) for performing press forming analysis using the created blank model, wherein the blank model creating step (S1) includes: a blank mesh creating step (S1-1) for creating a finite element mesh for configuring the blank model; a grouping step (S1-2) for grouping finite elements constituting the finite element mesh into a plurality of groups; and a deformation condition setting step (S1-3) for setting conditions relating to deformation for the finite elements of each grouped group, the set conditions being different for each group.
This material discharge control device 10 controls the discharge amount of a material 203 which is discharged from a material hopper 20. The material discharge control device 10 comprises a material property measuring device 12 for measuring the properties of the material 203 to be charged in the material hopper 20; and a control device 11 for controlling the discharge amount of the material 203 on the basis of the properties of the material 203.
A stress-strain relationship inference method according to the present invention involves: defining a converted parameter obtained by converting a parameter of the Yoshida-Uemori model; setting, as objective functions, the weighted residual sums of squares obtained by multiplying, by individual weighting coefficients, the residuals between experimental values and calculated values of a stress-strain curve under uniaxial tensile stress, the residuals between experimental values and calculated values of a stress-strain curve under repeated tension-compression stress, and the residuals between experimental values and calculated values of a mechanical characteristic value of a metal material; and determining the converted parameter and another parameter so as to minimize the objective functions under a restriction condition relating to possible ranges of the converted parameter and the other parameter.
G06F 119/14 - Force analysis or force optimisation, e.g. static or dynamic forces
61.
CHEMICAL AGENT FOR FORMING SOLID LUBRICATION COATING, CHEMICAL AGENT PRODUCTION METHOD, CHEMICAL AGENT APPLICATION METHOD, OIL WELL PIPE, AND OIL WELL PIPE SCREW JOINT
The present invention provides a chemical agent which is environmentally friendly and a solid lubrication coating. Provided is a chemical agent for forming a solid lubrication coating on a metal surface. The main components are a solid lubricant, a binder resin, and a solvent. The solvent has water as the main component thereof, and a lower alcohol with a carbon number of three or less is added as an additive to the water. The volume of the additive is 0.5-45 with respect to a volume of 100 of the water in the solvent. Not less than 95% of the volume of the solvent is constituted by water and the additive. At least a metal soap is contained as the solid lubricant. The metal soap component is not less than 95% of the total combined weight of the metal soap and an alkali soap component. The particle size of the metal soap does not exceed the film thickness of the solid lubrication coating. The binder resin is constituted by a water-soluble or water-dispersible polymer and a copolymer. The binder resin contains a copolymer and a polymer having an acrylate or methacrylate structure in an amount of not less than 90% of the total weight of the binder resin.
C09D 133/00 - Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, a; Coating compositions based on derivatives of such polymers
C10M 129/40 - Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
C10M 129/44 - Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms containing hydroxy groups
F16L 15/04 - Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
C10N 30/06 - Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
C10N 40/00 - Specified use or application for which the lubricating composition is intended
C10N 50/02 - Form in which the lubricant is applied to the material being lubricated dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
62.
COATING DRUG FOR FORMING SOLID LUBRICATING FILM, PRODUCTION METHOD FOR SAID COATING DRUG, OIL WELL PIPE REPAIRING METHOD, LUBRICATION IMPROVING METHOD FOR OIL WELL PIPE, AND OIL WELL PIPE
Provided is a drug which is environmentally friendly and durable for actual use in a well. The drug is for forming a solid lubricating film by being applied to a metal surface. The drug contains a solid lubricant, a binder resin, and a solvent as main components, wherein: the solvent contains water as a main component and is obtained by adding, as an additive, a lower alcohol having at most 3 carbon atoms to water; the volume of the additive is 0.5-10 with respect to 100 of the volume of the water; at least 95% of the volume of the solvent is composed of the water and the additive; the solid lubricant contains at least 95% of graphite and metallic soap and at most 1% of alkali soap, with respect to the total weight of solid lubricating components; the amount of the graphite is 0.5-5% with respect to the entire amount of the solid lubricant, in terms of weight ratio; the binder resin is a water-soluble or water-dispersible polymer; and the polymer is a polymer or copolymer containing at least 90% of monomers belonging to acrylate or methacrylate with respect to the total weight of the binder resin.
C09D 133/00 - Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, a; Coating compositions based on derivatives of such polymers
C10M 129/40 - Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms monocarboxylic
C10M 129/44 - Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms having 8 or more carbon atoms containing hydroxy groups
F16L 15/04 - Screw-threaded joints; Forms of screw-threads for such joints with additional sealings
C10N 40/00 - Specified use or application for which the lubricating composition is intended
C10N 50/02 - Form in which the lubricant is applied to the material being lubricated dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
63.
OIL WELL PIPE, OIL WELL PIPE SCREW JOINT, AND COATING MATERIAL
Provided is an oil well pipe screw joint having a solid lubrication coat having excellent lubrication and anti-rust properties. This oil well pipe constitutes a box (2) having a female screw or a pin (1) having a male screw that is used in the oil well pipe screw joint formed by linking the box (2) to the pin (1). The outermost layer of a screw section has a resin coat constituted of a binder resin containing an alkaline soap as a solid lubricant. The resin coat has an alkaline soap layer on the surface thereof.
C10M 129/28 - Carboxylic acids; Salts thereof having carboxyl groups bound to acyclic or cycloaliphatic carbon atoms
C10N 30/06 - Oiliness; Film-strength; Anti-wear; Resistance to extreme pressure
C10N 30/12 - Inhibition of corrosion, e.g. anti-rust agents, anti-corrosives
C10N 40/00 - Specified use or application for which the lubricating composition is intended
C10N 50/02 - Form in which the lubricant is applied to the material being lubricated dissolved or suspended in a carrier which subsequently evaporates to leave a lubricant coating
64.
THICK STEEL SHEET AND MANUFACTURING METHOD THEREFOR
The present invention proposes a method for producing a sintered ore with high productivity without requiring both an expensive anionic polymer dispersant and a step for grinding an iron ore into a fine powder. The present invention provides a method for producing a sintered ore, wherein a blended sintering starting material including iron ores of a plurality of brands is granulated together with additive water in a granulator, and the resultant granulated starting material for sintering is fired in a sintering machine so as to obtain a sintered ore. With respect to this method for producing a sintered ore, some or all of the additive water during the granulation is replaced with a dust slurry solution that is obtained by suspending solid dust in water at a concentration of 20-55 mass%.
00 of 70 J or more at 0°C and an Mn concentration distribution wherein: the area fraction of average Mn concentration regions, which are defined as the regions having an Mn concentration that is 0.9 to 1.1 times the average Mn content (% by mass), is less than 90%; the area fraction of Mn-enriched regions, which are defined as the regions having an Mn concentration that is not less than 1.15 times the average Mn content (% by mass), is 1.0% or more; and the average circle-equivalent diameter of the Mn-enriched regions is 7.0 µm or less.
The rolling mill according to the present invention is provided with a pair of upper and lower rolls arranged in a housing and with a roll chock that holds each of the upper and lower rolls, and a liner having a vibration-reducing function is provided on at least one of a housing-facing surface of the roll chock or a housing surface corresponding to a housing-facing surface.
F16F 15/02 - Suppression of vibrations of non-rotating, e.g. reciprocating, systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating system
F16F 15/04 - Suppression of vibrations of non-rotating, e.g. reciprocating, systems; Suppression of vibrations of rotating systems by use of members not moving with the rotating system using elastic means
Provided is a method for manufacturing a press-molded article whereby the effect of shape variation of a blank is reduced. This method for manufacturing a press-molded article comprises: a reference press-molded article shape acquisition step for acquiring a reference press-molded article shape (5); a first actual blank press-molded article shape acquisition step for acquiring a first actual blank press-molded article shape (13); a first actual deviation amount acquisition step for obtaining a first actual deviation amount between the reference press-molded article shape (5) and the first actual blank press-molded article shape (13); a second actual blank press-molded article shape acquisition step for acquiring a second actual blank press-molded article shape (23); a second actual deviation amount acquisition step for obtaining a second actual deviation amount between the reference press-molded article shape (5) and the second actual blank press-molded article shape (23); a countermeasure-requiring site identification step for identifying a countermeasure-requiring site; a bead imparting step for imparting a bead to an actual mold; and an actual press-molding step for performing press-molding using the actual mold imparted with the bead.
In an automotive body vibration characteristic testing method according to the present invention, vibration is input into an automotive body 100 and vibration characteristics of the automotive body are found. Said testing method includes an excitation step S1 for exciting the automotive body 100 by setting a plurality of vibration input locations 111 on the automotive body 100, which is supported by an air cushion 211, and inputting vibration into each of the plurality of vibration input locations 111 which have been set, and a vibration measurement step S3 for measuring data regarding the vibration characteristics of the automotive body 100 which has been excited. In the excitation step S1, vibration input waves input into some of the vibration input locations 111 on the automotive body 100 are more delayed than vibration input waves input into other vibration input locations 111.
Provided is a method for producing a high-strength carbonaceous lump using, as a raw material, a gas containing C in a constituent element. The method for producing a carbonaceous lump according to the present invention has: a carbon precipitation step in which a raw material gas containing a gas containing C in a constituent element is brought into contact with a solid containing Fe in a constituent element to generate a carbon-containing precipitate on a surface of the solid; a step for recovering the carbon-containing precipitate by separating the solid and the carbon-containing precipitate; and then, a lump forming step for obtaining a carbon lump by pressurizing and heating the carbon-containing precipitate.
The present invention proposes a production method for reduced iron that makes it possible to prevent clustering when a shaft furnace or a kiln furnace is used to reduce a reduction starting material by means of a reducing gas to obtain reduced iron. A production method according to the present invention involves using a shaft furnace or a kiln furnace to reduce a reduction starting material by means of a reducing gas to obtain reduced iron. The reduction starting material includes sintered ore. The reduction starting material preferably consists of: no more than 80 mass% of the sintered ore; and at least one of residual lump ore and pellets.
WW, the time from removal of the furnace lid 12 to the start of measurement by the laser-type three-dimensional shape measurement device 20 is denoted by t, and the distance from a kiln mouth 11 to the laser-type three-dimensional shape measurement device 20 is denoted by L, the furnace wall shape of the carbonization chamber 10 is measured by determining the time t and the distance L so as to satisfy expression (1) below. (1): (10/t)/{(L + 4)/5.5}2WW 4≤ 4.1 x 1012
An alternating-current electric motor inspection device of the present invention includes a slackness measuring device comprising an impacting device for imparting an impact to a wedge that fixes a stator of the alternating-current electric motor, a first measuring device for measuring an acceleration of the impact imparted by the impacting device, a second measuring device for measuring an acceleration of the wedge, and a housing accommodating the impacting device, the first measuring device and the second measuring device, wherein: the impacting device comprises a leaf spring, a cam which rotates, thereby pushing the leaf spring up and causing the same to deform elastically, a rotation imparting device for causing the cam to rotate, and a flatter for transmitting the impact imparted from the leaf spring to the wedge; and the housing is provided with a magnet wheel which is connected to the housing by way of a resilient body and which is capable of being accommodated inside the housing, and an electromagnet capable of magnetically attracting the housing to an inner peripheral surface of the stator.
The purpose of the present disclosure is to provide a galvanized steel sheet subjected to complicated molding for which it is difficult to adopt press molding, the galvanized steel sheet having a lubricating film which has: a small sliding resistance at a site having the risk of being cracked during press molding; and excellent press moldability at a site which has high surface pressure and in which the occurrence of mold galling is estimated. The present invention involves forming, on the surface of a galvanized steel sheet, a film containing: an acrylic resin having a glass transition point (Tg) of at least 100ºC and an acid value ratio R=acid value (mg-KOH/g)/Tg (ºC) of at least 1.50; and at least 5 mass% of a polyolefin wax having a melting point of 100-145ºC and an average particle diameter of at most 3.0 μm, so that the adhesion amount thereof per surface is in the range of 0.2 g/m2to 2.5 g/m2.
C23C 28/00 - Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of main groups , or by combinations of methods provided for in subclasses and
B32B 15/18 - Layered products essentially comprising metal comprising iron or steel
Provided is a microbiologically assisted cracking-resistant low-alloy steel that is practical in terms of production. The microbiologically assisted cracking-resistant low-alloy steel comprises C: 0.30% or less, Mn: 0.10-3.00%, P: 0.030% or less, N: 0.0100% or less, Si: 0.02-1.00%, S: 0.0002-0.0100%, Al: 0.003-0.500%, O: 0.0005-0.0050%, and further comprises one or two selected from Cu: 0.02-3.00% and Ag: 0.01-0.50%, with the remainder being a component composition including Fe and unavoidable impurities. The content ratio of Si to S, Si (%)/S (%), is 8-1200, and the content ratio of Al to O, Al (%)/O (%), is at least 3.
22 are added to an oxide which contains manganese and at least one element that is selected from the group consisting of nickel and cobalt, and the resulting mixture is heated so as to reduce the oxide. The reducing agent contains a carbon-containing material and an iron-containing material; and the iron-containing material is at least one substance that is selected from the group consisting of iron metal and iron oxide. The addition amount of the carbon-containing material and the iron-containing material is 1.0 equivalent to 1.5 equivalent in total.
This furnace temperature control device (20), which controls the temperature of a coke furnace to which a combustion chamber and a carbonization chamber are alternately connected, comprises: an input device (21) to which operation performance information, which includes at least performance values of the temperatures of the combustion chamber and carbonization chamber and performance values of the quantities of heat supplied to the combustion chamber and carbonization chamber, is input; a temperature prediction unit (24) which calculates temperature prediction values, which are the temperatures of the combustion chamber and carbonization chamber after an arbitrarily-determined prescribed time, on the basis of the operation performance information and a model that represents the relationship between time-series data of the operation performance information at a period of time ahead of a certain time and the temperature of the combustion chamber or carbonization chamber after the arbitrarily-determined prescribed time from the certain time; and a furnace temperature control unit (25) which calculates, on the basis of the calculated temperature prediction values, the quantities of heat supplied to the combustion chamber and carbonization chamber so as to be target temperatures.
Provided are equipment for cutting steel strips, cold rolling equipment, a method for cutting steel strips, and a method for producing steel strips that make it possible to stably cut joined sections of continuous steel strips and remove defective sections of steel strips. The equipment for cutting steel strips (1) comprises; a cutting device (4) that performs laser cutting of a joined section (2) detected by a joined section detection device (5) and in which the rear end of a leading steel strip and the leading end of a following steel strip are joined, and laser cutting of the vicinity of a defective section of a steel strip detected by a defect detection device (8); and a control device (9) that acquires detection signals from the joined section detection device and the defect detection device and causes the cutting device to operate on the basis of the detection signals. The control device has a plurality of modes including a first cutting mode in which the vicinity of a joined section is subjected to laser cutting and a second cutting mode in which the vicinity of a defective section is subjected to laser cutting. The control device causes the cutting device to operate in one cutting mode among the plurality of modes.
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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
B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
84.
STEEL STRIP CUTTING EQUIPMENT AND COLD-ROLLING EQUIPMENT
Provided are steel strip cutting equipment and cold-rolling equipment that enable accurate laser cutting of joint portions between continuous steel strips. Cutting equipment for steel strips (1) comprises a joint portion detecting device (5) for detecting a joint portion (2) in which a rear end of a leading steel strip and a tip end of a trailing steel strip are joined together, an end portion detecting device (6) for detecting end portions of the steel strips, a vibration suppressing device (7) for suppressing vibrations of the steel strips, and a cutting device (4) for performing laser cutting in the vicinity of the joint portion, wherein the end portion detecting device and the vibration suppressing device are provided on mutually separate frames.
B21B 15/00 - Arrangements for performing additional metal-working operations specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
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
B21B 38/00 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product
85.
SURFACE-TREATED STEEL SHEET AND METHOD FOR PRODUCING SAME
The present invention provides a surface-treated steel sheet which can be produced without the use of hexavalent chromium, and which has excellent corrosion resistance in a BPA-free coated part. The present invention provides a surface-treated steel sheet which comprises a steel sheet and a chromium-containing layer that is arranged on at least one surface of the steel sheet, wherein if the chromium-containing layer is observed from the surface direction, there are linear regions in which an element having a lower atomic number than chromium is enriched, and the number of the linear regions is 5.0 per 100 nm or more.
Provided are cold rolling equipment, steel plate manufacturing equipment, a cold rolling method, and a steel sheet manufacturing method capable of suppressing deformation of work rolls and suppressing brittle fracture during rolling. The cold rolling equipment comprises: one or more cold rolling mills that spray a coolant toward the work rolls and a metal steel strip to cold-roll the metal steel strip; a plurality of rolls that are provided farther upstream than the one or more cold rolling mills in a conveyance direction of the metal steel strip and are used to convey the metal steel strip; and a control device that controls the height difference between the plurality of rolls. The control device controls the plurality of rolls such that the metal steel strip is lowered toward the downstream side in the conveyance direction, on the upstream side of at least a portion of one or more cold rolling mills including the most upstream rolling mill provided on the most upstream side.
B21B 27/10 - Lubricating, cooling, or heating rolls externally
B21B 45/02 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for lubricating, cooling, or cleaning
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
87.
COLD IRON SOURCE SOLUBILITY ESTIMATION DEVICE, COLD IRON SOURCE SOLUBILITY ESTIMATION METHOD, AND REFINING TREATMENT METHOD FOR MOLTEN IRON
Provided is a cold iron source solubility estimation device that can calculate the solubility of a cold iron source by using high-versatility parameters. This cold iron source solubility estimation device 30 estimates the solubility of a cold iron source in a refining process for molten iron that uses the cold iron source as the raw material, the device including: an acquisition unit 36 that acquires furnace information, including information about the molten iron and cold iron source; a computation unit 38 that uses the furnace information to calculate the interfacial carbon concentration between the cold iron source and the molten iron, the dissolution rate of the cold iron source, and the solubility of the cold iron source; and an output unit 40 that outputs the solubility, wherein, when the interfacial carbon concentration satisfies a prescribed condition, the computation unit uses the interfacial carbon concentration calculated one step previously to calculate a first dissolution rate from a heat transfer balance equation, and a second dissolution rate from a carbon material balance equation, and calculates the dissolution rate of the cold iron source by proportionally dividing the first dissolution rate and the second dissolution rate.
METHOD FOR SETTING ROLLING CONDITION FOR COLD ROLLING MILL, COLD ROLLING METHOD, METHOD FOR MANUFACTURING STEEL SHEET, DEVICE FOR SETTING ROLLING CONDITION FOR COLD ROLLING MILL, AND COLD ROLLING MILL
In this method for setting rolling conditions for a cold rolling mill, a prediction model is generated by using, as an explanatory variable, first multi-dimensional data which includes three-dimensional steel sheet information including outside the pass-line of a material to be rolled on the entrance side of the cold rolling mill and which is obtained by converting past rolling performance data into multi-dimensional data, and by using, as objective variables, the control amount of a steering roll and a screw-down position of the cold rolling mill. Said method comprises a step for estimating at least one among the control amount of the steering roll and the screw-down position of the cold rolling mill by inputting, into the prediction model, second multi-dimensional data generated from the three-dimensional steel sheet information including outside the pass-line of the material to be rolled on the entrance side of the cold rolling mill.
B21B 37/68 - Camber or steering control for strip, sheets or plates, e.g. preventing meandering
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
B21B 37/00 - Control devices or methods specially adapted for metal-rolling mills or the work produced thereby
B21B 37/28 - Control of flatness or profile during rolling of strip, sheets or plates
B21B 38/02 - Methods or devices for measuring specially adapted for metal-rolling mills, e.g. position detection, inspection of the product for measuring flatness or profile of strips
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
89.
OPERATION METHOD OF VERTICAL DRY DISTILLATION FURNACE, PRODUCTION METHOD OF FERROCOKE AND VERTICAL DRY DISTILLATION FURNACE EQUIPMENT
Provided are: an operation method of a vertical dry distillation furnace that is capable of detecting an operational error in the vertical dry distillation furnace caused by an airflow imbalance in the furnace; a production method of ferrocoke; and a control unit of a vertical dry distillation furnace. An operation method of a vertical dry distillation furnace for producing ferrocoke, said vertical dry distillation furnace 10 comprising a dry distillation furnace body 12, one or more high-temperature tuyeres 13 for blowing a hot gas into the dry distillation furnace body, and two or more extraction tuyeres 16 that are located at positions different from the high-temperature tuyeres 13 in the height direction and exhaust the gas in the dry distillation furnace body, wherein the two or more extraction tuyeres 16 are provided at the same height but at different positions in the width direction. The aforesaid operation method includes: an acquisition step for acquiring the flow rate of the gas discharged from each of the extraction tuyeres 16; and a judgment step for judging as an operational error when the flow rate acquired in the acquisition step falls outside a preset flow rate range.
C10B 53/08 - Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form in the form of briquettes, lumps or the like
C10B 41/00 - Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
C10B 47/20 - Destructive distillation of solid carbonaceous materials with indirect heating, e.g. by external combustion with moving charge according to the "moving bed" technique
90.
GRANULAR IRON MANUFACTURING DEVICE AND GRANULAR IRON MANUFACTURING METHOD
Provided are a granular iron manufacturing device and a granular iron manufacturing method which are capable of effectively cooling granular iron and suppressing granular iron from being aggregated. This granular iron manufacturing device 70 has a water flow control container 30 and a cooling water pipe group 40 for supplying cooling water 24 into the water flow control container, wherein: the water flow control container 30 has a partition cylindrical body 32 having an inclined surface 34, and a duct cylindrical body 35 connected below the partition cylindrical body 32; the cooling water pipe group 40 has an upper stage cooling water pipe group 44 connected to the partition cylindrical body 32, an intermediate stage cooling water pipe group 46, and a lower stage cooling water pipe group 48; a first circulation flow is generated which circulates inside the partition cylindrical body 32 by means of cooling water 24 supplied from the intermediate stage cooling water pipe group 46 and the upper stage cooling water pipe group 44; and a second circulation flow is generated which circulates inside the duct cylindrical body 35 by means of the cooling water 24 supplied from the lower stage cooling water pipe group 48 and a water discharge from the partition cylindrical body 32.
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 method for manufacturing a press-molded article in which the effect of a blank shape variation is reduced. This method for manufacturing a press-molded article comprises a reference press-molded article shape acquisition step for acquiring a reference press-molded article shape (5), a corrugated blank press-molded article shape acquisition step for acquiring a corrugated blank press-molded article shape (9), a first deviation amount acquisition step for obtaining a first deviation amount between the reference press-molded article shape (5) and the corrugated blank press-molded article shape (9), a periodic-shifted corrugated blank press-molded article shape acquisition step for acquiring a periodic-shifted corrugated blank press-molded article shape (13), a second deviation amount acquisition step for obtaining a second deviation amount between the reference press-molded article shape (5) and the periodic-shifted corrugated blank press-molded article shape (13), a countermeasure-requiring site identification step for identifying a countermeasure-requiring site, and a bead-imparting step for imparting a bead to an actual mold.
Provided is an iron-based powder for an oxygen reaction agent that does not need the use of a metal halide and has excellent oxygen reactivity. The iron-based powder for an oxygen reaction agent includes: an iron powder having an atomic number ratio O/Fe of oxygen to iron of at most 0.3; at least one additive powder selected from the group consisting of a copper powder, a nickel powder, a molybdenum powder, a copper oxide powder, a nickel oxide powder, and a molybdenum oxide powder, wherein the content of the additive powder is 1.0 mass% to 40.0 mass%.
B01J 20/02 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
B01J 20/06 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising oxides or hydroxides of metals not provided for in group
Provided are a sowing machine and a sowing method that enable a travel position to be easily ascertained and enable sowing in a predetermined position, even in a waterlogged field. A sowing machine 1, 9, 10, 12, 13, 16 is provided with, on a base body 2 supported by wheels 3, 3R, 3L, 4R, and 4L configured to enable travel on a waterlogged field, a seeder 5 for sowing seed in the field. The sowing machine comprises a position detection device 6, 15 that uses, as a guide, any one of: a rut formed in the field by the wheels 3, 3R, 3L, 4R, 4L; a water channel preformed in the field; a linear ditch preformed in the field; and a flexible linear body 14 that is pre-stretched linearly to the field, the position detection device being provided to the base body 2, which engages with the guide.
Provided is a high-strength steel sheet for a hydrogen transport steel pipe, the high-strength steel sheet having excellent HISC resistance and fatigue crack growth resistance in a high-pressure hydrogen environment. A high-strength steel sheet for a hydrogen transport steel pipe according to the present invention contains, in terms of mass%, 0.030-0.060% of C, 0.01-0.50% of Si, 0.80-1.80% of Mn, at most 0.015% of P, at most 0.0015% of S, 0.010-0.080% of Al, 0.05-0.50% of Cr, 0.005-0.080% of Nb, 0.005-0.020% of Ti, 0.0020-0.0080% of N, and 0.0005-0.0050% of Ca, wherein: the average Vickers hardness value at a position 0.25 mm downward from the surface of the steel sheet+3σ is at most 225 HV; the top 20% particle diameter in the center structure in the sheet thickness is at most 30 μm; the fatigue crack growth rate when the stress intensity factor range ∆K is 45 (MPa∙m1/2) is less than 2.0×10-2 (mm/cycle); and the tensile strength is at least 535 MPa.
A control method for a blast furnace according to the present invention comprises: a step for estimating the temperature distribution of a residual solidified layer at the time of restarting the blast furnace using a temperature distribution estimation model of the residual solidified layer; a step for estimating the expansion behavior of the residual solidified layer by using an expansion estimation model of the residual solidified layer in accordance with the estimated temperature distribution, and estimating the stress applied to the furnace shell of the blast furnace in accordance with the estimated expansion behavior of the residual solidified layer; and a step for controlling an increase speed in the number of opening tuyeres to a predetermined value or less and controlling the position of a tap hole for discharging hot metal, when the estimated stress is greater than or equal to an allowable value.
The purpose of the present invention is to provide a resistance spot welding method. The present invention provides a resistance spot welding method for joining two or more steel sheets including at least one zinc-plated steel sheet, the method comprising: a first current application step in which a nugget that has a nugget diameter of 3.0√t mm to 4.5√t mm is formed; and a second current application step that is a multiple-stage step having n stages, each of which is composed of a cooling step for maintaining a current non-application state for not less than 10 ms but less than 160 ms and a current application step for applying a current for not less than 20 ms but less than 200 ms. In addition, the current value of the current application step in each stage of the multiple-stage step satisfies formula (1) and formula (2); and the current value I1 in the first stage is not less than the current value in the first current application step. (1): I1 ≤ I2 ≤ … ≤ In (2): I1 < In
Provided is an iron-based powder for an oxygen reactant that has exceptional oxygen reactivity. This iron-based powder for an oxygen reactant contains an iron powder having an atomic number ratio O/Fe of oxygen and iron of 0.30 or less and a carbonaceous powder having a C content of 50 mass% or greater, the content value for the carbonaceous powder being 0.20-30.00 mass%.
B01J 20/02 - Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
To provide a test piece for a 3-point bending CTOD test with which it is possible to more reliably ensure the straightness of fatigue cracks. This method is for preparing a test piece (1) for a 3-point bending CTOD test (20) comprising a butt-welded joint obtained by butt-welding steel plates. The thickness of the test piece (1) is set to 125 mm or above, the test piece (1) is subject to notch processing (11A) and then a reverse-bending treatment (11B) in the direction in which a notch (2) formed by the notch processing (11A) closes, and a fatigue crack is introduced in the notch (2) to obtain the test piece (1), the reverse-bending treatment (11B) satisfying the following relationships (1) and (2). [Relationship 1] 0.9 ≤ Lr (=Prb/PL) ≤ 1.0 [Relationship 2] 1.0 ≤ k (=af/wrb) ≤ 1.5
The purpose of the present invention is to manufacture a zinc-plated steel sheet that is free of pickups and that has a stable quality. In this method for heating a steel plate, a steel plate passes through a direct-fired heating furnace having an oxidization band in which operation is performed with an air ratio of 1 or higher, and passes through a reduction band in which operation is performed with an air ratio of less than 1. While the steel plate is passing through at least the reduction band, the front surface side and the back surface side of the steel plate are subjected to heating by fire blasted from one or more slit burners disposed extending along the width direction of the steel plate.
The purpose of the present invention is to produce a galvanized steel plate that is free from unplating and has stable quality. A method for heating a steel plate, the method including heating the obverse and reverse sides of a steel plate passing through a direct-fired heating furnace that has an oxidation zone operated at an air ratio of 1 or greater and a reduction zone operated at an air ratio of less than 1 by using flames that are injected from one or more slit burners while the steel plate passes at least through the oxidation zone.