Provided is a hot-rolled steel sheet: that has a desired chemical composition; in which a metal structure thereof at a 1/4 position in the sheet thickness direction from a surface consists of, in terms of area%, less than 3.0% of residual austenite, not less than 15.0% but less than 60.0% of ferrite, and less than 5.0% of pearlite and has an E value of 10.7 or greater, an I value of 1.020 or greater, a CS value of -8.0 × 105to 8.0 × 105, and a standard deviation of the Mn concentration of 0.60% by mass or less; and in which, at the surface, the area% of a region in which the Ni concentration is 0.2% by mass or greater is 10.0% or greater, the area% of a region in which the O concentration is 3.0% by mass or greater is 3.0-50.0%, a maximum value of the sphere-equivalent diameter of an oxide is 5.00 µm or less, and the tensile strength is 980 MPa or greater.
A cooling floor member (100) cools a battery cell. The cooling floor member (100) comprises: a metal underfloor material (101); a flat plate-like metal floorboard (102) which is disposed opposite the metal underfloor material (101) and a surface of which, on the side opposite the metal underfloor material (101), contacts the battery cell; a partition member (105) that is sandwiched between, without being joined to, the metal underfloor material (101) and the flat plate-like metal floorboard (102); and a joint (130) affording a direct continuous join between an outer peripheral edge of the metal underfloor material (101) and an outer peripheral edge of the flat plate-like metal floorboard (102). A region surrounded by the metal underfloor material (101), the flat plate-like metal floorboard (102), and the partition member (105) is a cooling liquid flow path (104) through which a cooling liquid flows.
A seamless steel tube having an inner surface and an outer surface, and having a chemical composition of, by mass, 0.06% or less of C, 0.55% or less of Si, 0.70-1.40% of Mn, 0.020% or less of P, 0.0005-0.020% of S, 0.005% or less of N, 0.0005-0.0035% of O, 0.25-0.45% of Cu, 0.50% or less of Ni, 0.20% or less of Mo, and 0.05-0.15% of Sb, with the remainder made up by Fe and impurities, the metal structure containing 90.0% or more of ferrite by area, the average crystal grain diameter of ferrite in the tube inner surface layer being 3.0-20.0 μm, the average crystal grain diameter of ferrite in the tube outer surface layer being 3.0-25.0 μm, the tube inner surface layer and the tube outer surface layer containing MnS and MnS oxide, the number density of MnS being 100/mm2, and the ratio of the number density of MnS oxide relative to the number density of MnS being 0.10 or more.
C21D 8/10 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of tubular bodies
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
1 < Ra(D)/Ra(S) ≦ 12 is satisfied in each of at least one pair of block opposing end faces (for example, a pair of block opposing end faces (111a, 111i)). Here, Ra(D) is the surface roughness of the block opposing end face in the stacking direction. Ra(S) is the surface roughness in the main magnetic flux direction (or rolling direction) of the plate surface of a steel plate having an end face that configures a part of the block opposing end face.
Provided is a duplex stainless steel material having excellent whole surface corrosion resistance in a high-temperature, high-pressure, strong acidic corrosive environment, and excellent pitting corrosion resistance in a high-temperature, high-pressure, chloride corrosive environment. The duplex stainless steel material according to the present disclosure has a chemical composition containing, in mass%, 0.050% or less of C, 0.2-1.2% of Si, 0.5-7.0% of Mn, 0.040% or less of P, 0.010% or less of S, 20.0-27.0% of Cr, 4.0-9.0% of Ni, 0.5-5.0% of Mo, 0.0005-0.0100% of As, a total of 0.0005-0.0100% of one or more of Ca and Mg, 0.001-0.050% of sol.Al, 0.40% or less of N, and 0.100% or less of O, with the remainder comprising Fe and impurities, and satisfies relationships (1) and (2). (1) 0.70 < 10000 × As/(Ni + Cu) < 16.00; (2) (Ca + Mg)/O < 1.50
The purpose of the present invention is to provide a grain-oriented electromagnetic steel sheet in which iron loss is improved and which suppresses a decrease in productivity in magnetic domain control in which a laser groove is formed. A grain-oriented electromagnetic steel sheet according to the present invention has multiple grooves in the surface of the steel sheet, and has protrusions at groove lateral parts adjacent to each of the grooves in the surface of the steel sheet. The crystal orientation of at least one crystal grain existing inside each of the protrusions differs by 5°C or more from the goss orientation which is the crystal orientation of crystal grains at portions excluding vicinities of the protrusions in the steel sheet. As a result, iron loss in the electromagnetic steel sheet is improved and a step for removing the protrusions becomes unnecessary.
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 surface-treated steel sheet comprises: a base-material steel sheet; a plating layer formed on a surface of the base-material steel sheet; and a coating film formed on a surface of the plating layer. The plating layer has a Zn concentration between 40 mass% and 100 mass% inclusive, and has an Mg concentration between 0 mass% and less than 4.0 mass%. Between the interface and the center in the thickness direction between the interface and the surface, a maximum concentration of Ti in mass%, a maximum concentration of Zr in mass%, and a maximum concentration of V in mass% satisfy a predetermined relationship. In addition, an average concentration of C in mass% at the central part of the coating film, a maximum concentration of Mg in mass% in the boundary region of the coating film, an average concentration of Mg in mass% at the central part of the coating film, a maximum concentration of F in mass% in the boundary region of the coating film, an average concentration of F in mass% at the central part of the coating film, and an average concentration of Si in mass% at the central part of the coating film satisfy a predetermined relationship.
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
C23C 22/36 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing fluorides or complex fluorides containing also phosphates
This surface-treated steel sheet has a base material steel sheet, a plating layer, a first coating, and a second coating. The plating layer has a Zn concentration of 40%-100% and a Mg concentration of 0% or more and less than 4.0%. The following items satisfy a predetermined relationship: the maximum concentration of Ti, the maximum concentration of Zr, and the maximum concentration of V in the interval from a first interface to the center of the the first coating film in the thickness direction of the first interface and a second interface; the average concentration of C in the central section of the first coating; the average concentration of C in the central section of the second coating; the maximum concentration of Mg in a border area of the first coating; the average concentration of Mg in the central section of the first coating; the maximum concentration of F in the border area of the first coating; the average concentration of F in the central section of the first coating; the average concentration of Si in the central section of the first coating; the average concentration of Zn in the central section of the first coating; and the average concentration of Zn in the central section of the second coating.
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
C23C 22/36 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using aqueous acidic solutions with pH < 6 containing fluorides or complex fluorides containing also phosphates
A wheel (100) comprises a boss section (10), a rim section (20), and a plate section (30). The rim section (20) includes a tread (211) and a flange (212). The plate section (30) includes a curved portion (31). The curved portion (31) is provided so as to be contiguous with the rim section (20). In a vertical cross-sectional view of the wheel (100), the curved portion (31) curves so as to protrude toward the opposite side from the flange (212) in the axial direction of the wheel (100). The apex (313) of the curved portion (31) is located to the outside of the center (Cw) of the plate section (30) in the radial direction of the wheel (100). In the vertical cross-sectional view of the wheel (100), the plate section (30) has a plate thickness that changes along the direction in which the plate section (30) extends. The maximum plate thickness of the plate section (30) is in the curved portion (31).
Provided is a seamless steel pipe in which the difference between the strength at full wall thickness and the strength in a post-cutting state is low. This seamless steel pipe has a prescribed chemical composition. Fn1 represented by formula (1) is 0.44 or higher. The crystal grain size number according to ASTM E112-13 (2021) in a central portion of the wall thickness is 6.0 or higher. Each of NDos/NDc and NDis/NDc is 0.60 or higher, where, with respect to a cross-section perpendicular to the pipe axial direction, NDos is the number density of V-containing particles having a circle equivalent diameter of 10-100 nm at a depth of 2 mm from the outer surface of the steel pipe, Ndis is the number density of V-containing particles having a circle equivalent diameter of 10-100 nm at a depth of 2 mm from the inner surface of the steel pipe, and NDc is the number density of V-containing particles having a circle equivalent diameter of 10-100 nm in the central portion of the wall thickness. Formula (1): Fn1=C+Mn/6+(Cr+Mo+V)/5+(Cu+Ni)/15. The atomic symbols in formula (1) are assigned the respective contained amount of the corresponding elements in terms of mass%.
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
11.
GRAIN-ORIENTED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR MANUFACTURING SAME
An objective of the present invention is to provide a grain-oriented electromagnetic steel sheet that exhibits improved iron loss in magnetic domain control for forming laser grooves in a steel sheet that has been subjected to decarburization annealing but has not yet been subjected to final annealing. The grain-oriented electromagnetic steel sheet according to the present invention, which comprises a steel sheet that has a plurality of grooves in the surface thereof, and a glass film that is formed on the surface of the steel sheet, is characterized in that: the absolute value of the angle θ formed by the longitudinal direction of the grooves and the direction perpendicular to the rolling direction and the sheet thickness direction the steel sheet is 0-40°, the width W of the grooves is 20-300 μm, the depth D of the grooves is 10-40 μm, and the spacing P between the grooves in the rolling direction is 1.0-30 mm; and relational expression (1) is satisfied, where t1 is the thickness of the portions of the glass film on the flat portions (portions other than the grooves) of the surface of the steel sheet, and t2 is the thickness of the portion of the glass film at the deepest portion of the grooves. (1): t2/t1<1.00
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present disclosure provides a high-strength steel plate having an improved post-molding appearance. The steel plate of the present disclosure has a specific chemical composition and is characterized by comprising a metal structure that includes 75-97% of ferrite and 3-25% of a hard phase in terms of area, the standard deviation of the hard phase percentage for the rolling right-angle direction being 0.75% or less.
The present invention addresses the problem of providing a surface-treated steel sheet that particularly improves resistance to surface contact scratch caused by contact between one surface and the other surface as a further improvement in scratch resistance, and that has excellent corrosion resistance. The surface-treated steel sheet has, on either surface thereof, a plating layer, a first coloring membrane layer, and a second coloring membrane layer. The ratio of the film thickness of the second coloring membrane layer to the film thickness of the first coloring membrane layer is between 0.1 and 0.5 inclusive. The first coloring membrane layer and the second coloring membrane layer contain resin particles. The proportion of the number of the resin particles having a thickness greater than or equal to the film thickness of the first coloring membrane layer is between 1% and 30% inclusive. The proportion of the number of the resin particles having a thickness greater than or equal to the film thickness of the second coloring membrane layer is between 50% and 100% inclusive.
B32B 15/08 - 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
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
A precoated steel sheet according to the present invention addresses the problem of achieving more excellent scratch resistance and more excellent coating film adhesion even in cases where a coating film has a large film thickness. This precoated steel sheet comprises a Zn-containing plating layer, a chemical conversion coating layer containing at least zirconium, and a coating layer; the coating layer contains at least a binder resin and resin particles; the average thickness of the coating film is 3 µm to 10 µm; the intensity of zirconium at the Zn-containing plating layer-side interface of the coating layer is 1.05 to 3.00 times the average intensity of zirconium in the range of 1 µm to 2 µm from the surface of the coating film as calculated based on the depth profile of the zirconium distribution of the coating film as determined by glow discharge optical emission spectrometry; and if a cross-section of the coating film in the thickness direction is examined, the average area ratio of the resin particles in a region having a length of 60 µm in a direction that is perpendicular to the thickness direction is 5% to 30%.
B32B 15/08 - 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
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
This non-oriented electromagnetic steel sheet includes a steel sheet and the chemical composition of the steel sheet contains, in mass%, 0.0030% or less of C, 1.0-3.5% of Si, 0.10-2.00% of Al, 0.1-2.0% of Mn, 0.20% or less of P, 0.0030% or less of S, 0.0030% or less of N, 0.0030% or less of Ti, 0.0020% or less of B, 0-0.200% of Sn, and 0-0.1000% of Sb, with the remainder comprising Fe and impurities, wherein [Sn] and [Sb], which are the content of Sn and the content of Sb, in mass%, respectively, satisfy [Sn]+2×[Sb]≤0.200, and WH/WL, which is the ratio between the maximum value WH and the minimum value WL of core loss W10/400, is 1.10 or less (when the width of the steel sheet is W, W/10 part, W/4 part, and W/2 part are the part at the W/10 position, the part at the W/4 position, and the part at the W/2 position of the sheet width from the end in the width direction, respectively).
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 steel plate has a given chemical composition and has an α value of 1.00-1.50 mass%, a β value of 10.0-15.0, a γ value of 0.70-1.50 mass%, a Ceq value of 0.550-0.620 mass%, a yield strength of 670-870 N/mm2, a tensile strength of 780-940 N/mm2, and a Charpy absorption energy at -65°C of 100 J or greater. When the steel plate is examined for hardness distribution at a pitch of 0.05 mm with respect to 121 portions of 1 mm × 1 mm located at 1/4 the plate thickness, the average hardness is 265-290 Hv and the standard deviation is 20 or less. The steel plate has a thickness of 10-60 mm.
C22C 38/54 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with boron
B21B 1/38 - 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 sheets of limited length, e.g. folded sheets, superimposed sheets
Provided is a solid wire for submerged arc welding, wherein: the chemical composition of the solid wire, in terms of mass% with respect to the total mass of the solid wire is 0-0.650% C, 0.03-0.50% Si, 4.1-30.0% Mn, 0-0.050% P, 0-0.050% S, 0-5.0% Cu, 1.0-30.0% Ni, 0-10.0% Cr, 0-10.0% Mo, 0-1.00% Nb, 0-1.00% V, 0-1.00% Co, 0-1.00% Pb, 0-1.00% Sn, 0-0.10% Al, 0-0.10% Ti, 0-0.1000% B, 0-0.5000% N, and 0-0.0050% O, with the remainder being Fe and impurities; (Mn+Ni) is not less than 5.0%; (Mn+Ni+Cr) is not less than 15.0%; and the fcc ratio is not less than 70%.
The present invention provides a coated arc welding rod comprising a steel core wire and flux coating the core wire, wherein the chemical composition of the core wire is as follows: C: 0% to 0.650%, Si: 0.03% to 0.50%, Mn: 2.1% to 30.0%, P: 0% to 0.050%, S: 0% to 0.050%, Cu: 0% to 5.0%, Ni: 1.0% to 30.0%, Cr: 0% to 10.0%, Mo: 0% to 10.0%, Nb: 0% to 1.00%, V: 0% to 1.00%, Co: 0% to 1.00%, Pb: 0% to 1.00%, Sn: 0% to 1.00%, Al: 0% to 0.10%, Ti: 0% to 0.10%, B: 0% to 0.1000%, N: 0% to 0.5000%, remainder: Fe and impurities; (Mn + Ni) is 5.0% or more; (Mn + Ni + Cr) is 15.0% or more; and the fcc ratio in the core wire is 70% or more.
This flux cored wire comprises a steel exterior skin and flux, where the chemical composition of the steel exterior skin is: 0 to 0.650% of C; 0.03-0.50% of Is; 3.1-30.0% of Mn; 0-0.050% of P; 0-0.050% of S; 0-5.0% of Cu; 1.0-30.0% of Ni; 0-10.0% of Cr; 0-10.0% of Mo; 0-1.0% of Nb; 0-1.0% of V; 0-1.0% of Co; 0-1.0% of Pb; 0-1.0% of Sn; 0-0.10% of Al; 0-0.10% of Ti; 0-0.1000% of B; 0-0.500% of N; and the remainder being Fe and impurities. The flux cored wire satisfies Mn + Ni ≥ 5.0% and Mn + Ni + Cr ≥ 15.0%, and the fcc percentage of the steel exterior skin is at least 70%.
Provided is a weld metal comprising: 0.030-1.000% of C; 0.03-0.50% of Si; 4.1-30.0% of Mn; 0-0.050% of P; 0-0.050% of S; 0-5.0% of Cu; 1.0-30.0% of Ni; 0-20.0% of Cr; 0-10.0% of Mo; 0-1.000% of Nb; 0-1.00% of V; 0-1.00% of Co; 0-1.00% of Pb; 0-1.00% of Sn; 0-20.0% of W; 0-5.0% of Mg; 0-0.100% of Al; 0-5.0% of Ca; 0-0.100% of Ti; 0-0.5000% of B; 0-0.500% of REM; 0-0.500% of Zr; 0-0.5000% of N; and 0.0010-0.1500% of O, with the balance being Fe and impurities, wherein Mn+Ni is at least 5.0%, and Nb+Ti+V+Al is at least 0.005%.
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
This non-oriented electromagnetic steel sheet comprises a base steel sheet and an insulating coating film, in which the base steel sheet has a specified chemical composition, the base steel sheet has a thickness of 0.10 mm to 0.35 mm inclusive, and the average crystal grain diameter is 10 μm or less in a surface region lying between the surface of the base steel sheet and a depth of 1/20 the thickness of the base steel sheet when a cross-section of the base steel sheet which is cut in a direction parallel to the thickness direction is observed.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
C22C 38/60 - Ferrous alloys, e.g. steel alloys containing lead, selenium, tellurium or antimony, or more than 0.04% by weight of sulfur
H01F 1/147 - Alloys characterised by their composition
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
Provided are: a cut-processed product of a Zn-Al-Mg-based plated steel material comprising a base steel material and a Zn-Al-Mg-based plating layer coated on the surface of the base steel material, in which a cut edge surface of the cut-processed product is covered by the Zn-Al-Mg-based plating layer at a cut edge surface covering ratio of 50 to 99%, each of a non-plated surface of the base steel material and the Zn-Al-Mg-based plating layer around the non-plated surface is covered with a repairing coating film in the cut edge surface of the cut-processed product, the initial coating film resistance value in the repairing coating film is 10 to 1000 Ω/cm2, the coating film resistance value after the immersion of the cut-processed product in 5%-by-mass salt water for 3 hours is 5 to 50 Ω/cm2, and the thickness of the repairing coating film is 10 μm or more; and a guardrail in which the cut-processed product is used.
C23F 11/00 - Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
B23D 15/00 - Shearing machines or shearing devices cutting by blades which move parallel to each other
C23C 2/06 - Zinc or cadmium or alloys based thereon
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
E01F 15/04 - Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips
Provided is a cut article of a Zn-Al-Mg-plated steel material having a base steel material and a Zn-Al-Mg plating layer covering the surface of the base steel material, wherein a cut end surface of the cut article is coated with a linear film in which components of the Zn-Al-Mg plating layer flow in a linear fashion, the percentage of the cut end surface coated with the linear film is 60-90%, the non-plated surface of the base steel material and the linear film around the non-plated surface on the cut end of the cut article are coated with a repair coating film, the initial coating film resistance value of the repair coating film is 10-1000 Ω/cm2, the coating film resistance value after the cut article has been immersed in 5 mass% brine for three hours is 5-50 Ω/cm2, and the thickness of the repair coating film is 10-100 μm. Also provided is a guardrail in which the cut article is utilized.
C23F 11/00 - Inhibiting corrosion of metallic material by applying inhibitors to the surface in danger of corrosion or adding them to the corrosive agent
B23D 15/00 - Shearing machines or shearing devices cutting by blades which move parallel to each other
C23C 2/06 - Zinc or cadmium or alloys based thereon
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
E01F 15/04 - Continuous barriers extending along roads or between traffic lanes essentially made of longitudinal beams or rigid strips
The present invention pertains to a composition that may undergo α-γ transformation. The composition contains 0.0010-0.0050% of Ti. When a surface of a steel sheet is measured using a scanning electron microscope with electron backscatter diffraction (SEM-EBSD) and if the area ratio of crystal grains in a {hkl} orientation (tolerance: within 10°) with respect to the entire visual field is represented by Ahkl-uvw, A411-011 is at least 15%, and the number density of deposits is 0.5-50 pieces/μm2.
C21D 8/12 - Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
The present invention provides a martensitic stainless steel material which has high strength, excellent SSC resistance, and excellent toughness at low temperatures. A martensitic stainless steel material according to the present disclosure contains, in mass%, 0.030% or less of C, 1.00% or less of Si, 1.00% or less of Mn, 0.030% or less of P, 0.0050% or less of S, 10.00% to 16.00% of Cr, 4.00% to 7.50% of Ni, 1.10% to 3.50% of Mo, 0.005% to 0.050% of Al, 0.01% to 0.30% of V, 0.0030% to 0.0500% of N, 0.020% to 0.150% of Ti, 0.01% to 3.50% of Cu and 0.01% to 0.50% of Co, while having a yield strength of 758 MPa or more. With respect to this martensitic stainless steel material, the area ratio Sd (%) of δ ferrite and the area ratio Sc (%) of an intermetallic compound in a cross-section that is parallel to the rolling direction satisfy formula (1) and formula (2). (1): 0 < Sd ≤ 10.00 (2): Sc/Sd ≤ 5.00
C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
A method for manufacturing a press-molded article (300, 400) comprises: sandwiching a blank (200) between a die (20, 20B) and a blank holder (30, 30A-30F); and using a punch (10, 10B) to push in the blank (200) in a pressing direction (Z). When viewed from the pressing direction (Z), a rim (24) of the die (20, 20B) on the punch (10, 10B) side thereof includes a curved section (241) that is curved convexly on the punch (10, 10B) side and that extends with a radius of curvature less than 400 mm. When viewed from the pressing direction (Z), a space (C) between a rim (34) of the blank holder (30, 30A-30F) on the punch (10, 10B) side thereof and the rim (24) of the die (20, 20B) on the punch (10, 10B) side thereof varies along the rim (24) of the die (20, 20B), said space being on a perpendicular line in the direction of extension of the rim (24) of the die (20, 20B), When viewed from the pressing direction (Z), the spacing (C) is smallest at the curved section (241).
This grain-oriented electrical steel sheet comprises a base steel sheet, a forsterite coating film formed on the surface of the base steel sheet, and an insulation film formed on the surface of the forsterite coating film, wherein: the chemical composition of the base steel sheet contains 0.80 to 7.00% by mass of Si; the area ratio of crystal grains having a distance in the rolling direction between crystal grain boundaries in the surface of the base steel sheet of 3.0 mm to 13.0 mm inclusive is 70% or more; B8 that is a magnetic flux density generated by a magnetic force of 800 A/m is 1.88 T or more; W17/50 that is an iron loss where the frequency is 50 Hz and the maximum magnetic flux density is 1.7 T is 13.1×t2-4.3×t+1.2 (W/kg) or less where the sheet thickness is t (mm); and LvA200Hz that is a 200 Hz component of a magnetostriction waveform is 60 to 78 dBA.
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 traverse hardening method which is characterized by using a traverse hardening device (100) equipped with a plurality of high frequency coils, and by involving: rotating a shaft-like body (10), which is inserted inside the plurality of high frequency coils (111), relative to the plurality of high frequency coils (111); moving the plurality of high frequency coils (111) axially relative to the shaft-like body (10); performing traverse hardening by moving a plurality of heating areas which are generated on the surface of the shaft-like body (10) by the plurality of high frequency coils (111); and changing at least one of the rotation speed of the shaft-like body (10) relative to the plurality of high frequency coils (111) and the moving speed of the plurality of high frequency coils (111) relative to the shaft-like body (10) in the axial direction such that a plurality of heating zones, which the plurality of heating areas pass through, overlap each other or lie adjacent to each other.
Provided is a mobile hardening method characterized in that a shaft body (10) is heated by a plurality of high-frequency coils (111), a cooling unit (120) is caused to follow the high-frequency coils (111) from behind in the relative moving direction of the high-frequency coils (111) along the axial direction of the shaft body (10), the part heated by the high-frequency coils (111) is cooled by the cooling unit (120), and mobile hardening is carried out while moving the high-frequency coils (111) toward the direction perpendicular to the axial direction of the shaft body (10) so that the distances from the surface of the shaft body (10) to the respective high-frequency coils (111) are constant, wherein the speed in the axial direction of the high-frequency coils (111) at the time when the high-frequency coils (111) pass through a step part (13) is slower than the speed in the axial direction of the high-frequency coils (111) at the time when the high-frequency coils (111) pass through a small diameter part (12) or a large diameter part (11).
Provided is a high-strength hot-rolled steel sheet having a predetermined chemical composition, wherein at all of the positions of 1/10W, 3/10W, 5/10W, 7/10W, and 9/10W from the end in the width direction (W is the total width in the direction perpendicular to the rolling direction and the sheet thickness direction), the metal structure at 1/4 position of the sheet thickness contains, in area%, at least 95% of tempered martensite, 5% or less of fresh martensite, and 5% of less in total of at least one among ferrite, upper bainite, and pearlite, and the difference between the maximum and minimum tensile strengths at all of the positions in the width direction is 30 MPa or less.
Provided is an austenite alloy material having excellent nitriding resistance in a high-temperature ammonia environment. The austenite alloy material of the present disclosure contains, in mass%, C: more than 0 to 0.200%, Si: more than 0 to 3.00%, Mn: more than 0 to 3.00%, P: more than 0 to 0.050%, S: more than 0 to 0.050%, Ni: 40.00 to 80.00%, and Cr: 10.00 to 35.00%, also contains one or more selected from the group consisting of Sn, Zn, Pb, Sb, As, and Bi, also contains one or more selected from the group consisting of Cu, Mo, Co, W, Ti, Nb, V, B, N, rare earth elements, Al, Ca, and Mg, with the remainder comprising Fe and impurities. Fn1 is less than 20, and Fn2 is higher than 21 and less than 50. Fn1=177.84+11.12Si-24.36Mn-8.11Cu-1.61Cr-1.78Ni-2.68Mo Fn2=(Sn+Zn+Pb+Sb+As+Bi)×103
C22C 30/02 - Alloys containing less than 50% by weight of each constituent containing copper
C22C 30/04 - Alloys containing less than 50% by weight of each constituent containing tin or lead
C22C 30/06 - Alloys containing less than 50% by weight of each constituent containing zinc
C22C 19/05 - Alloys based on nickel or cobalt based on nickel with chromium
C22F 1/00 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
C22F 1/10 - Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
33.
BAKED FLUX, METHOD FOR MANUFACTURING SUBMERGED-ARC-WELDED JOINT, AND SUBMERGED-ARC-WELDED JOINT
232232322, 0-10.00% MnO, and 0-10.00% metallic Cr, the remainder comprising impurities. A method for manufacturing a welded joint according to another embodiment of the present invention comprises a step for submerged-arc-welding a steel material using the abovementioned baked flux.
This slag amount estimation method includes: capturing, with a single imaging device, an image of a slag flow which flows out from an outlet of a refining vessel and expands in width in the upstream rather than in the downstream; finding the width of the slag flow from the captured image and then finding a volume flow rate or mass flow rate; and estimating an amount of slag on the basis of the found volume flow rate or mass flow rate.
[Problem] To maintain the corrosion resistance of the outer surface of a lithium ion battery even if an electrolyte solution has adhered to the outer surface of the lithium ion battery. [Solution] The present invention relates to a lithium ion battery in which a battery unit that comprises a positive electrode, a negative electrode and a separator and an electrolyte solution that contains a lithium salt are housed in a housing case that has a main body part and a cover part, wherein: an Ni-plated steel sheet or a laminated steel sheet is used as the material of the housing case; at least either a first sealing part which seals the main body part and the cover part or a second sealing part which seals the cover part and a liquid injection port cover for sealing a liquid injection port that is provided in the cover part and is for injecting the electrolyte solution into the housing case; and the first sealing part or the second sealing part has a film part which contains at least one of a Ca compound, an Al compound and an La compound on a portion that has an Fe content of 80% by mass or more.
H01M 50/103 - Primary casings, jackets or wrappings of a single cell or a single battery characterised by their shape or physical structure prismatic or rectangular
H01M 50/122 - Composite material consisting of a mixture of organic and inorganic materials
H01M 50/126 - Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure comprising three or more layers
H01M 50/128 - Primary casings, jackets or wrappings of a single cell or a single battery characterised by the material having a layered structure comprising three or more layers with two or more layers of only inorganic material
H01M 50/15 - Lids or covers characterised by their shape for prismatic or rectangular cells
H01M 50/167 - Lids or covers characterised by the methods of assembling casings with lids by crimping
H01M 50/169 - Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
H01M 50/184 - Sealing members characterised by their shape or structure
(Problem) The purpose of the present invention is to provide a method for recovering rare-earth elements comprising, while recovering scandium from iron and steel slag, crudely separating scandium and a rare-earth element other than scandium. (Solution) The method is characterized by multiple leaching at different pH ranges of rare-earth elements including scandium from iron and steel slag. The present invention is characterized by further combining a leachate obtained by the method with an element separation step to allow highly efficient recovery of scandium.
C22B 3/06 - Extraction of metal compounds from ores or concentrates by wet processes by leaching in inorganic acid solutions
C22B 3/22 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means
C22B 3/24 - Treatment or purification of solutions, e.g. obtained by leaching by physical processes, e.g. by filtration, by magnetic means by adsorption on solid substances, e.g. by extraction with solid resins
C22B 3/26 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds
C22B 3/38 - Treatment or purification of solutions, e.g. obtained by leaching by liquid-liquid extraction using organic compounds containing phosphorus
A wheel (100) comprises a boss part (10), a rim part (20), and a plate part (30). The boss part (10) includes a contour line (14) extending from the plate part (30) to an end face (12) in the axial direction of the boss part (10) when viewed in a longitudinal cross-section of the wheel (100). The contour line (14) includes curves (141, 142). The first curve (141) is continuous with the plate part (30). The first curve (141) has a first curvature radius (R1). The second curve (142) is positioned on the side of the end face (12) in the axial direction of the boss part (10) with respect to the first curve (141). The second curve (142) has a second curvature radius (R2). The second curvature radius (R2) is larger than the first curvature radius (R1). The length of the second curve (142) is longer than that of the first curve (141).
Provided is a plated steel sheet having high LME resistance. A plated steel sheet according to the present invention is characterized by having a prescribed chemical composition and is characterized in that: when the C-concentration is measured by GDS in the depth direction of a base steel sheet starting from the interface between the base steel sheet and a plating layer, the depth at which the C-concentration is 0.05% or less is 10 μm or more; the thickness of a layer where the area percentage of a ferrite phase is 90% or more is at least 20 μm in the depth direction from the surface of the base steel sheet; and the roughness expressed as Ra of the interface between the base steel sheet and the plating layer is 3.0 μm or less.
The present invention addresses the problem of providing a steel sheet and a plated steel sheet that have high LME resistance and hydrogen desorption. This steel sheet and plated steel sheet are characterized: by having prescribed chemical components; in that the depth in the depth direction from the surface of the steel sheets at which the C concentration as measured by GDS is no more than 0.05% is at least 10 μm; in that the thickness in the depth direction from the surface of the steel sheets of a layer that has a ferrite phase area fraction of at least 90% is at least 20 μm; and in that the Ra surface roughness of the steel sheets is no more than 3.0 μm.
This hot-rolled steel sheet has a specific chemical composition; the metal structure of this hot-rolled steel sheet at a position where the depth from the surface is 1/4 in the sheet thickness direction comprises, in area%, less than 3.0% of residual austenite, not less than 15.0% but less than 60.0% of ferrite and less than 5.0% of pearlite, while having an E value of 10.7 or more, an I value of 1.020 or more, a CS value of -8.0 × 105to 8.0 × 105, and a standard deviation of the Mn concentration of 0.60% by mass or less; the average solid solution Cr concentration in the outermost layer region is 0.10% by mass or more; and the average number density of Cr oxides having a sphere equivalent radius of 0.1 µm or more in the surface is 1.0 × 104per cm2 or less.
A laminated core 10 is formed by alternately laminating electromagnetic steel sheets 1 and adhesive insulating films 2. After completion of reaction of the adhesive insulating films 2, the tensile adhesive strength in a laminating direction D of the laminated core 10 is 20 MPa or higher when measured under a condition at 25°C. A method for manufacturing the laminated core 10 comprises: a punching step for punching electromagnetic steel sheets coated with the adhesive insulating films 2 and forming the electromagnetic steel sheets 1; a storage step for laminating and storing the electromagnetic steel sheets 1 in a mold after the punching step; a low-pressure adhesion step for heating the electromagnetic steel sheets 1 in the mold at a surface temperature of 60-200°C, applying pressure on the electromagnetic steel sheets at 3.0 MPa or lower, and bonding the adjacent electromagnetic steel sheets 1 to each other, to thereby form the laminated core 10; and a taking-out step for taking out the laminated core 10 from the mold after the low-pressure adhesion step.
H01F 3/02 - Cores, yokes or armatures made from sheets
H01F 27/245 - Magnetic cores made from sheets, e.g. grain-oriented
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
H02K 15/02 - Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
42.
LAMINATED IRON CORE MANUFACTURING METHOD, MANUFACTURING DEVICE, LAMINATED IRON CORE, AND ROATING ELECTRIC MACHINE
This laminated iron core manufacturing method comprises: a step for pressing electromagnetic steel sheets each having a coating containing an adhesive agent which exhibits adhesiveness via heating provided to a sheet surface thereof with a mold (2) and converting the same into unit iron cores (1); and a step for layering the unit iron cores (1) pressed with the mold (2), heating a plurality of partial regions of the sheet surface of the unit iron core (1) of the uppermost layer, and partially bonding the same to the unit iron core (1) of a lower layer thereto in the plurality of regions. Thereby, pressing machining and laminating are performed substantially simultaneously as a series of operations, and it is possible to increase the efficiency of laminated iron core manufacturing without increasing person-hours.
H02K 15/02 - Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
The present invention addresses the problem of providing a welded joint inhibited from having undergone LME cracking during the production. This welded joint is characterized in that: the welded joint is configured of plated steel plates having given chemical components; in the non-heat-affected portion of each plated steel plate, the depths at which the concentration of C as determined by GDS is 0.05% or less are 5 μm or greater from the interface as a starting point between the plating layer and the base steel plate along the base depth direction; in a cross-section of the non-heat-affected portion of the steel plate, the interface between the plating layer and the base steel plate has a roughness of 3.0 μm or less in terms of Ra; and in the range of 0-100 μm from each edge of the bead of the weld in the direction opposite from the weld, the concentration of C in the base steel plate at a depth of 5 μm from the interface as a starting point between the plating layer and the base steel plate is 0.05% or less.
The present invention addresses the problem of providing a welded joint in which LME cracking during manufacturing is suppressed. A welded joint according to the present invention is characterized in that: a plated steel sheet forming the welded joint has a prescribed chemical composition; when the C-concentration is measured by GDS in a thermally non-affected portion of the welded joint in the depth direction of a base steel sheet starting from the interface between the base steel sheet and a plating layer of the plated steel sheet, the depth at which the C-concentration is 0.05% or less is 10 μm or more; the roughness expressed as Ra of the interface between the base steel sheet and the plating layer of the plated steel sheet in the thermally non-affected portion is 3.0 μm or less; and, at a position 500 μm apart from an end of a pressure welded portion of the welded joint, the thickness of a layer where the area percentage of a ferrite phase is 90% or more is at least 15 μm in the depth direction of the base steel sheet starting from the interface between the base steel sheet and the plating layer of the plated steel sheet.
Provided is a steel plate characterized by having a predetermined chemical composition and having a metal structure including, in terms of area percentage, 80-95% of ferrite, 5-20% of martensite, and a total of 0-10% of at least one of bainite, pearlite, and retained austenite, and having the average grain spacing of martensite of 2.5 μm or less, and the standard deviation of 1.5% or less in the area ratio of martensite in the direction perpendicular to the rolling direction and the sheet thickness direction.
This steel sheet has a base steel sheet that has a prescribed chemical composition and a galvanization layer that is formed on the surface of the base steel sheet, wherein: where the sheet thickness of the base steel sheet is t, the metallographic structure of the base steel sheet at a t/4 location, which is a location at a depth of t/4 from the surface in a cross section in the sheet thickness direction, includes at least 85% of tempered martensite, at least 7% of retained austenite, and 0-8% of at least one substance selected from ferrite, pearlite, bainite, and fresh martensite by volume; the metallographic structure in a surface region, which is the range up to a location 50 μm from the surface in the cross section in the sheet thickness direction, includes at least 30% of bainite by volume, where the remainder is at least one substance selected from ferrite, pearlite, tempered martensite, fresh martensite, and retained austenite; and prior austenite grains in the surface region have a diameter in the sheet thickness direction of no more than 10.0 μm and a tensile strength of at least 1,470 MPa.
The present invention provides a plated steel material and a method for manufacturing same, the plated steel material comprising a base steel material and a plating layer, wherein the plating layer includes a Zn-Al-Mg alloy layer disposed on a surface of the base steel material and a Mg-rich layer disposed on a surface of the Zn-Al-Mg alloy layer, and the thickness of the Mg-rich layer is 0.8 μm or more and is equal to or less than [the thickness of plating layer × 1/2].
bMbMtMtMbMbM in formula (1) and formula (2) is the concentration, in mass%, of the metal element M at a position of 0.95H from the surface of the surface treatment film.
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 9/00 - Layered products essentially comprising a particular substance not covered by groups
B32B 15/04 - Layered products essentially comprising metal comprising metal as the main or only constituent of a layer, next to another layer of a specific substance
C21D 1/18 - Hardening; Quenching with or without subsequent tempering
C21D 9/00 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
C22C 21/02 - Alloys based on aluminium with silicon as the next major constituent
This hot-rolled steel sheet has a desired chemical composition; the metal structure of this hot-rolled steel sheet at a position where the depth from the surface is 1/4 in the sheet thickness direction comprises, in area%, less than 3.0% of residual austenite, not less than 15.0% but less than 60.0% of ferrite and less than 5.0% of pearlite; alloy carbides in the ferrite has an average sphere equivalent radius of not less than 0.5 nm but less than 10.0 nm, and an average number density of not less than 0.10 × 1016per cm3but less than 1.45 × 1016per cm3; the E value that indicates the periodicity of the metal structure is 10.7 or more; the I value that indicates the uniformity of the metal structure is 1.020 or more; and the standard deviation of the Mn concentration is 0.60% by mass or less.
222/Zn ternary eutectic structure is 0% to 65%, with the remainder being 0% to 5.0%, and the total area ratio of the Al phase and the Zn-Al phase with respect to the Al-Zn phase ([Al]+[Zn-Al])/[Al-Zn]) is 0.8 or more.
Provided is a surface-treated steel sheet with which it is possible to obtain exceptional corrosion resistance, adhesion with respect to an adhesive, and blackening resistance, and furthermore to obtain exceptional condensation discoloration resistance. In a surface-treated steel sheet according to the present embodiment, a plating layer contains, in terms of mass%, more than 5.0% and less than 25.0% of Al, and more than 3.0% and less than 12.5% of Mg, the balance being 65.0% or more of Zn and impurities. A chemical conversion coating formed on the plating layer contains Zr, V, P, and Co, and an acrylic resin. The mass [V]mg/m2of V and the mass [P]mg/m2of P in the chemical conversion coating satisfy relationship (1), and the mass [V]mg/m2 of V and the Mg content [Mg]b mass% of the plating layer satisfy relationship (2). [Relationship (1)] 0.60≤[V]/[P]≤2.80; [Relationship (2)] 0<[V]/[Mg]b≤20.00
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
C22C 18/04 - Alloys based on zinc with aluminium as the next major constituent
C23C 2/06 - Zinc or cadmium or alloys based thereon
C23C 22/60 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using aqueous solutions using alkaline aqueous solutions with pH > 8
53.
MIXED POWDER, MGO PARTICLES, METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR PRODUCING MGO PARTICLES, AND METHOD FOR PRODUCING MIXED POWDER
A mixed powder for an annealing separating agent having MgO as a main ingredient, wherein the average particle diameter of the mixed powder is 0.10 to 8.50 µm, the mixed powder contains B, the content of B in the entire mixed powder is 0.005 mass% or more and less than 0.040 mass%, the proportion of 3-coordinate boron among the B is 5 mass% or more and less than 70 mass%, and the ratio of circumference to thickness of primary particles containing the MgO is 6.0 or more.
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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
54.
INFERENCE METHOD, INFERENCE DEVICE, AND INFERENCE PROGRAM
On the basis of measured sensor information obtained from some bogies, of a railway vehicle, having sensors mounted thereon, this inference device makes inference on the condition of a bogie of another railway vehicle that has the same condition as the bogies of said railway vehicle but has no sensor mounted thereon.
This steel material has an average chemical composition containing 18.00-36.00% of Ni and 5.50-12.00% of Si and has a metal structure that includes an austenite phase and an ordered phase. This automobile component comprises the steel material.
A plated checkered steel plate comprising, on one plate surface, a base checkered steel plate provided with protruding parts having a height of 3 mm or less and flat parts, a plating layer including a zinc-based alloy layer arranged on the plate surface of the base checkered steel plate where the protruding parts and flat parts are provided, and a chemical conversion coating layer provided on the surface of the plating layer, wherein the film thickness of the chemical conversion coating layer on the flat parts of the base checkered steel plate is 0.10 to 5.00 μm per side, and the film thickness ratio of the chemical conversion coating layer on the protruding parts and the flat parts of the base checkered steel plate (film thickness of the chemical conversion coating layer on the flat parts/film thickness of the chemical conversion coating layer on the protruding parts) is 0.2 to 5.0.
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
C23C 2/06 - Zinc or cadmium or alloys based thereon
57.
MIXED POWDER, MGO PARTICLES, METHOD FOR PRODUCING GRAIN-ORIENTED ELECTRICAL STEEL SHEET, METHOD FOR PRODUCING MGO PARTICLES, AND METHOD FOR PRODUCING MIXED POWDER
C23C 22/00 - Chemical surface treatment of metallic material by reaction of the surface with a reactive liquid, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
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
58.
MANUFACTURING METHOD AND BLANK FOR PRESS-FORMED PRODUCT
This manufacturing method for a press-formed product comprises: sandwiching a blank (10) between a support surface (140) of a first press mold (100) and a support surface (340) of a third press mold (300); and pushing a second press mold (200) into the first press mold (100) to draw-form the blank (10). A ridgeline (130) at an edge of a press hole (123) of the first press mold (100) is provided with a curved region (131) that extends in a curved manner. When a prescribed corner end (11) is defined, the corner end (11) between an intersection M and an intersection N of the blank (10) includes all of a line segment MO and all of a line segment NO, and a portion of the corner end (11) is outside an area between the line segment MO and the line segment NO.
[Problem] The purpose of the present invention is to provide: an iron and steel slag modification method which is capable of modifying iron and steel slag so that a specific mineral phase of the iron and steel slag contains a rare earth element-enriched phase, wherein a rare earth element is concentrated, when the rare earth element in the iron and steel slag is recovered; and iron and steel slag which has a rare earth element-enriched phase. [Solution] An iron and steel slag modification method which comprises a step for melting iron and steel slag that contains a rare earth element, and a step for adding a phosphate to the iron and steel slag; and iron and steel slag which has a rare earth element-enriched phase.
C22B 9/10 - General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor
The present invention comprises bringing heating units (212a to 212l, 222a to 222l) into contact with regions to be heated (11a to 11l) of outermost electromagnetic steel sheets (10a, 10b) of an electromagnetic steel sheet group (100) to pressurize and heat the regions to be heated (11a to 11l) at once.
H02K 15/02 - Methods or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines of stator or rotor bodies
The present invention provides a duplex stainless steel material which has excellent intergranular corrosion resistance. A duplex stainless steel material according to the present disclosure is composed of, in mass%, 0.030% or less of C, 0.50% or less of Si, 2.00% or less of Mn, 0.040% or less of P, 0.0010% or less of S, 26.0% to 28.0% of Cr, 6.0% to 10.0% of Ni, 0.20% to 1.70% of Mo, more than 2.00% but not more than 3.00% of W, more than 0.30% but not more than 0.40% of N, 0.020% or less of O and 0.050% or less of Al, with the balance being made up or Fe and impurities; and if the longitudinal direction and the thickness direction of three rectangular regions thereof are respectively defined as direction L and direction T, and five line segments that divide each region into six equal parts in direction L are defined as line segments LS, the average thickness TF of ferrites overlapping with 15 line segments LS is 2.50 µm to 4.50 µm, the sample standard deviation ∆TF of the ferrite thickness is 0.50 µm or less, and the average thickness TA of austenites overlapping with the line segments LS is 2.50 µm to 4.50 µm.
C21D 8/00 - Modifying the physical properties by deformation combined with, or followed by, heat treatment
C21D 9/08 - Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes
C22C 38/58 - Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.5% by weight of manganese
[Problem] To provide a coated metal sheet which can be produced in a simpler manner, can further improve an anti-viral function, and has durability. [Solution] The present invention relates to a coated metal sheet having a metal sheet and a coating layer located on at least one surface of the metal sheet, in which the metal sheet has a zinc-containing metal layer containing at least zinc on at least one surface thereof, and also has, as the coating layer, a first coating layer located on the outermost surface of the coated metal sheet and containing at least a compound having a photocatalytic activity, the average thickness of the first coating layer is 0.05 to 5.00 μm, the total thickness from the surface of the zinc-containing metal layer to the outermost surface of the first coating layer is 15.00 μm or less, and the concentration of zinc ions eluted into a virus-containing solution is 0.60 to 5.00% by mass when the anti-virus test prescribed in JIS R1756:2020 is performed for 4 hours.
B32B 15/08 - 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
B32B 15/01 - Layered products essentially comprising metal all layers being exclusively metallic
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
Provided is a steel plate characterized by having: a specific chemical composition; an average Vicker's hardness Hs, in a region spanning from at least one surface to 10% of the plate thickness, that is no greater than 0.60 times the average Vicker's hardness Hc at a position of 1/2 the plate thickness; a ratio of macroscopic brittle fracture surface of 35.0% or less as determined by a Charpy impact test at room temperature; and a tensile strength of 1500 MPa or greater.
w0w1w1c1w2w2c2EE is maintained. Further provided is a spot welded joint in which the number ratio of crystal grains having an aspect ratio of 7 or more is 50% or less in an intermediate portion in the longer-axis direction of a nugget.
A temperature measurement device for measuring the temperature of a steel sheet, wherein: an imaging unit, which is a spectral camera, has a field of view that includes at least a portion of the steel sheet in the width direction of the steel sheet, and acquires the radiance of the steel sheet at a plurality of wavelengths at positions on a surface of the steel sheet in the field of view; and a calculation processing unit 14 selects two wavelengths from among the wavelengths at which the radiance of the steel sheet is acquired by the imaging unit, and uses the radiance of the steel sheet, which has been acquired by the imaging unit at the selected two wavelengths, to calculate the temperature at each of the positions on the surface of the steel sheet by two-color radiation pyrometry.
This induction heating device for metal sheets comprises: a first conductor member that is disposed facing at least one surface among the front surface and the rear surface of a metal sheet and disposed across the metal sheet in the width direction; a second conductor member that is spaced away, by a first distance, from the first conductor member in the sheet passing direction of the metal sheet, and is disposed facing at least one surface among the front surface and the rear surface of the metal sheet and disposed across the metal sheet in the width direction; connecting members that connect the first conductor member and the second conductor member to each other at positions spaced away from width direction end sections of the metal sheet to form a primary closed circuit; and an alternating current power source that is connected to the primary closed circuit. The first distance is greater than the sum of the dimensions of the first conductor member and the second conductor member in the sheet passing direction of the metal sheet.
B21B 45/00 - Devices for surface treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
H05B 6/10 - Induction heating apparatus, other than furnaces, for specific applications
In the present invention, the volumes of cores (1120, 1220) are made to differ between a heating upstream-side area and a heating downstream-side area.
In one slot (1121a, 1121b, 1221a, 1221b), first copper pipes (1111a to 1111f, 1211a to 1211f) and a second copper pipe (1111g, 1111h, 1211g, 1211h) are disposed. At each position (each y-coordinate) in a heated length direction in the one slot, the first copper pipe is located closest to a conductor plate M. In the one slot, the second copper pipe is located closer to the conductor plate M than at least one first copper pipe. In the one slot, there is at least one second copper pipe electrically connected in series to the first copper pipe.
An adhesive resin composition-coated electromagnetic steel sheet comprising a steel sheet and an adhesive resin composition coating film provided to at least one surface of the steel sheet, wherein the adhesive resin composition coating film is a semi-cured object of an adhesive resin composition that contains a curing agent and an adhesive resin containing a thermosetting resin as at least a portion thereof, the maximum penetration λ of the adhesive resin composition coating film at 100-300°C as measured through a thermomechanical analysis described in JIS K 7196:2012 is not less than 3% but less than 100%, a portion of the curing agent exists in the adhesive resin composition coating film in a crystal state, and the depolarization light scattering intensity I of the adhesive resin composition coating film is 1.00×107to 50.00×107.
C09J 133/04 - Homopolymers or copolymers of esters
C09J 163/00 - Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
C09J 167/00 - Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
H01F 1/147 - Alloys characterised by their composition
H01F 1/18 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
71.
ADHESIVE RESIN COMPOSITION-COATED ELECTROMAGNETIC STEEL SHEET AND METHOD FOR PRODUCING SAME
An adhesive resin composition-coated electromagnetic steel sheet comprising: a steel sheet; and an adhesive resin composition film on at least one surface of the steel sheet, wherein the adhesive resin composition film is a semi-cured product of an adhesive resin composition composed of a curing agent and an adhesive resin containing at least partially a thermosetting resin, the maximum penetration λ of the adhesive resin composition film at 100-300°C is at least 3% and less than 100%, as measured by thermomechanical analysis according to JIS K 7196:2012, a portion of the curing agent in the adhesive resin composition film is present in a crystalline state, and the area ratio of the curing agent in the crystalline state in a cross section, parallel to the surface of the steel sheet, of the adhesive resin composition film is 0.10-40%.
C09J 133/04 - Homopolymers or copolymers of esters
C09J 163/00 - Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
C09J 167/00 - Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
H01F 1/147 - Alloys characterised by their composition
H01F 1/18 - Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets with insulating coating
H01F 41/02 - Apparatus or processes specially adapted for manufacturing or assembling magnets, inductances or transformers; Apparatus or processes specially adapted for manufacturing materials characterised by their magnetic properties for manufacturing cores, coils or magnets
The present invention provides a steel material which has excellent fusion cracking resistance, excellent resistance to cracking during hot working and excellent machinability, and which enables a component for machine structures to achieve a high fatigue strength in cases where the component is formed of this steel material. A steel material according to the present disclosure has a chemical composition that is set forth in the description, while having an Fn of 0.45-1.05, the Fn being defined by formula (1). With respect to this steel material, the number density of fine Bi particles that have a circle-equivalent diameter of 0.1-1.0 µm is 15.00 per mm2or more and the number density of coarse Bi particles that have a circle-equivalent diameter of 10.0 µm or more is 0.25 per mm2or less at a depth of 0.08R (R represents the radius) from the surface of the steel material; and the number density of the fine Bi particles is less than 15.00 per mm2and the number density of the coarse Bi particles is more than 0.25 per mm2 at a depth of 0.65R from the surface of the steel material.
This fastening member comprises a body portion, a first end portion, a second end portion, a first linking portion, and a second linking portion. A part of the body portion that is adjacent to the first linking portion and the first linking portion have outer diameters with different values. The outer diameters of the first end portion and the first linking portion are smaller than the outer diameter of the part of the body portion adjacent to the first linking portion. A part of the body portion that is adjacent to the second linking portion and the second end portion have outer diameters with different values. The thicknesses of the first end portion and the first linking portion as viewed from the axial direction are smaller than the thickness of the body portion.
(Problem) Provided are a quantitative analysis method and a quantitative analysis device that speed up calibration in mass spectrometry using a mass spectrometer, and that are less likely to be affected by a device state (fluctuations in sensitivity). (Solution) This quantitative analysis method using a mass spectrometer for a measurement target comprises: a gas introduction step for introducing, into a mass spectrometer, a mixture of a gas of the measurement target and a carrier gas that is different from the gas of the measurement target and that has at least two natural isotopes; a mass spectrometry step for performing mass spectrometry on the gas of the measurement target and the at least two natural isotopes in the carrier gas, using the mass spectrometer; and a gas concentration calculation step for calculating the concentration of the gas of the measurement target, using, as a calibration reference, an analysis value of the at least two natural isotopes in the carrier gas obtained in the mass spectrometry step.
G01N 27/62 - Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electric discharges, e.g. emission of cathode
Provided is a sliding member having excellent peeling resistance against a plating layer even when sliding under high surface pressure exceeding 1.5 GPa in terms of hertzian surface pressure. A sliding member (1) comprises: a substrate (2) including a sliding surface (20) that slides on other members; and a plating layer (3) disposed at least on the sliding surface (20). The plating layer (3) includes a matrix (30) and polytetrafluoroethylene (31). The matrix (30) is a Zn-Ni alloy containing 10.0-17.0 mass% of Ni, with the remainder comprising Zn and impurities. The content of polytetrafluoroethylene (31) in the plating layer (3) is 6.5-21.0 mass%.
An aluminum-plated steel sheet for hot stamping according to the present invention comprises: a base material steel sheet; an aluminum plating layer that is provided on at least one surface of the base material steel sheet; and a surface treatment film that is provided on the aluminum plating layer, wherein the surface treatment film contains a needle-like compound X, of the needle-like compound X, the proportion of a needle-like compound X1 in which the ratio of the major axis thereof to the minor axis thereof is 4-50 and which has a hexagonal crystal structure is not less than 70% by number, and, of the needle-like compound X1, the proportion of a needle-like compound X2 in which a smaller one of angles at an intersection of a straight line that is parallel to the major axis thereof and a straight line that is parallel to a surface of the aluminum plating layer is 0-40 degrees is not less than 70% by number.
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
The welded joint according to an embodiment of the present invention comprises: a first steel plate; a second steel plate; a weld bead with which an end of the first steel plate is bonded to a first surface of the second steel plate; an HAZ; a coating film disposed on the surfaces of the welded joint; and a scale lying between the HAZ and the coating film so as to be in contact with the HAZ on the second-surface side of the second steel plate that is opposite from the first surface. The second steel plate has a chemical composition satisfying Ti+1.2×Al-1.2×C-7×P>0. The weld bead has a penetration depth of 50-90% with respect to the thickness of the second steel plate. The scale contains, in terms of atm.%, 2.00-60.00% Ti and 2.00-30.00% Al. In the region overlying the HAZ on the second-surface side of the second steel plate, the areal proportion of the coating film which peels off in a coating-film peel test is 15% or less.
This impact-absorbing member for an automobile door is molded from a blank which is a monolithic blank or a tailored blank. The impact-absorbing member for an automobile door comprises a coupling-band portion extending in a first direction, and at least three coupled portions one end of each of which is connected to the coupling-band portion and which extend in a second direction transverse to the first direction. The coupled portions include an impact-absorbing location that is a closed-cross section structure.
This hot-rolled steel sheet has a desired chemical composition and has a metal structure which contains, in terms of area%, at least 10% of bainite, at least 10% of tempered martensite, a total of 70-96% of bainite and tempered martensite, at most 20% of fresh martensite, 4-12% of retained austenite, at most 5% of ferrite, and at most 5% of pearlite, and in which: the average grain diameter of prior austenite grains is at most 20.0 μm; the average aspect ratio of prior austenite grains is at most 3.00; and the area ratio of an aggregate of fresh martensite having a major diameter of at least 30 μm and retained austenite is at most 5%.
This mobile quenching device performs mobile quenching on a shaft body in which a large-diameter part having a relatively large outside diameter and a small-diameter part having a relatively small outside diameter adjoin each other across a step part, the mobile quenching device comprising a plurality of split coils that are disposed in a ring shape around a center axis and that channel a high-frequency current, and a coil drive unit for moving each of the split coils towards and away from the center axis. Each of the split coils is provided with a plurality of convex coil parts shaped so as to be convex away from the center axis when viewed along the center axis. The convex coil parts are disposed so as to at least partially overlap in the direction in which the center axis extends, and so as to overlap in the radial direction centered on the center axis when viewed along the center axis.
Provided is a guard rail beam characterized by being constituted from a plated steel material comprising a steel material and a plating layer that is formed on both surfaces of the steel material and that comprises Zn-based plating, at least one edge surface of the steel material being covered by the plating layer, and the relationships 0.60 × tc ≤ te < tc, We ≥ Wc, and Wt ≥ Wc being satisfied (where tc is the average plate thickness (mm) of the steel material at positions at least 10 mm inward from the edge surface covered by the plating layer, te is the average plate thickness (mm) of the steel material at positions 1-10 mm from the edge surface covered by the plating layer, We is the average thickness (μm) of the plating layer per surface at positions 1-10 mm from the edge surface covered by the plating layer, Wc is the average thickness (μm) of the plating layer per surface at positions at least 10 mm inward from the edge surface covered by the plating layer, and Wt is the average thickness (μm) of the plating layer on the edge surface covered by the plating layer).
This traverse hardening device performs traverse hardening on a shaft-like body in which a large-diameter portion having a relatively large outer diameter and a small-diameter portion having a relatively small outer diameter are contiguous via a stepped portion, and comprises: a plurality of first coil sections arranged in a first position on a traverse central line, in an annular shape around the traverse central line; a plurality of second coil sections arranged in a second position different from the first position on the traverse central line, in an annular shape around the traverse central line; a first coil section driving unit that moves each of the first coil sections toward and away from the traverse central line; a second coil section driving unit that moves each of the second coil sections toward and away from the traverse central line; and a control unit that controls the first coil section driving unit and the second coil section driving unit.
This panel set (100) comprises an outer panel component (1), an inner panel component (2), and a stiffening member (3). The outer panel component (1) includes an outer panel body (10) that bends convexly outward in a cross-sectional view perpendicular to a first direction. The inner panel component (2) includes an inner panel body (20), and is integrated with the outer panel component (1). The stiffening member (3) is disposed in space (V) between the outer panel body (10) and the inner panel body (20). A first outer-side corner part (35) and a second outer-side corner part (36) of the stiffening member (3) are bonded to the outer panel body (10), and a first inner-side lateral part (33) and a second inner-side lateral part (34) of the stiffening member (3) are bonded to the inner panel body (20).
Provided is a metal pipe for oil wells, the pipe having outstanding high-torque performance. A metal pipe for oil wells (1) according to the present disclosure comprises a main pipe body (10). The main pipe body (10) has a pin (40) and a box (50). The pin (40) includes a pin contact surface (400) including a male pin section (41). The box (50) includes a box contact surface (500) including a female screw section (51). The metal pipe for oil wells (1) further comprises a resin coating film (100) formed as a top layer on at least either the pin contact surface (400) or the box contact surface (500). The resin coating film (100) includes an epoxy resin. The resin coating film (100) was measured using a 1222 of the three components is 110.0 µs or less.
According to the present invention, a hollow member has a circumferential hardness difference section in at least a portion in the longitudinal direction along the center axis thereof. When viewing the circumferential hardness difference section in a cross-section perpendicular to the center axis, a thickness difference, derived by subtracting the minimum value of the thickness in the circumferential direction of the cross-section from the maximum value of the thickness, is no more than 20% of an average value of the thickness over the entire circumference of the cross-section. Furthermore, when the average of the integral of the Vicker's hardness over the entire circumference of the cross-section is used as a hardness threshold, the cross-section includes: a low-strength range in which the Vicker's hardness in the circumferential direction is no more than the hardness threshold; and a high-strength range in which the Vicker's hardness in the circumferential direction exceeds the hardness threshold.
B21C 37/06 - Manufacture of metal sheets, rods, wire, tubes, profiles or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of tubes or metal hoses; Combined procedures for making tubes, e.g. for making multi-wall tubes
B21D 22/28 - Deep-drawing of cylindrical articles using consecutive dies
This wound core is configured so that the average distance of first group connection sections and the average distance of second group connection sections satisfy prescribed conditions, said average distances determined under prescribed conditions.
This welded joint manufacturing method includes: a thermal stress calculating step for obtaining a thermal stress generated in a welded joint as a result of a difference between a linear expansion coefficient of welded metal and the linear expansion coefficient of a base material at a usage temperature of a low-temperature liquefied gas tank; a required CTOD value calculating step for obtaining a required CTOD value for preventing brittle fracture of the low-temperature liquefied gas tank during operation of the low-temperature liquefied gas tank, taking into account the effects of thermal stress, assuming a defect in the welded joint; a CTOD value measuring step for measuring the CTOD value of a heat affected zone of the welded joint at the usage temperature of the low-temperature liquefied gas tank; and a welding step for welding the base material, using, as the base material, a thick steel plate for which it has been confirmed that the CTOD value of the heat affected zone is equal to or greater than the required CTOD value.
B23K 31/00 - Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by any single one of main groups
B63B 25/16 - Load-accommodating arrangements, e.g. stowing or trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
This plated steel sheet comprises a steel sheet and a plating layer disposed over a surface of the steel sheet. The chemical composition of the plating layer contains, in mass%, 10.0-30.0% Al, 3.0-15.0% Mg, 0.01-2.0% Fe, greater than 0 to 2.0% Si, and 0.05-2.0% Ca, as well as one or two elements selected from the group consisting of group A and group B, with the remainder being Zn and impurities. The number density of Ca-Zn phases with an equivalent circle diameter of 1 μm or greater exposed on the surface of the plating layer is 0-10 per 10,000 μm2area, and the number density of Al-Si-Zn-Ca phases with an equivalent circle diameter of 1 μm or greater exposed on the surface of the plating layer is 1-50 per 10,000 μm2 area.
This component analysis system for a molten metal bath is provided with: a laser oscillator for emitting a laser beam; a tubular probe an open end of which is immersed in a molten metal bath, which supplies inert gas toward the open end, and which optically guides the laser beam to the open end to irradiate the molten metal; and a detection unit for detecting plasma emission from the molten metal produced by the laser beam irradiation and performing spectral analysis. The position of the open end of the tubular probe in the molten metal bath and/or the angle of the tubular probe with respect to the perpendicular direction is configured to be controllable.
G01N 21/71 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light thermally excited
C23C 2/00 - Hot-dipping or immersion processes for applying the coating material in the molten state without affecting the shape; Apparatus therefor
C23C 2/06 - Zinc or cadmium or alloys based thereon
G01N 21/63 - Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
G01N 33/205 - Metals in liquid state, e.g. molten metals
Provided is a wound core which is constructed by laminating a plurality of bent bodies in a plate thickness direction, the bent bodies being obtained by forming a grain-oriented electrical steel sheet. The wound core includes a plurality of flat portions and a plurality of corner portions. The bent bodies each include a plurality of flat areas and a plurality of bend areas adjacent to the flat areas. The radius of curvature of each bend area is less than or equal to 5.0 mm. The bent bodies each include one or more joint portions where end faces of the grain-oriented electrical steel sheet in the longitudinal direction thereof face each other. In the wound core, an average distance of a first group of joint portions and an average distance of a second group of joint portions according to a predetermined condition are greater than or equal to 25 mm. In this way, it is possible to avoid interference between the plastic strain and elastic strain in a bend area and the sheering strain in a joint portion, and to suppress iron loss.
Provided is a metal pipe for an oil well, the metal pipe comprising a Zn-Ni alloy plating layer having excellent seizure resistance. A metal pipe (1) for an oil well according to the present disclosure comprises a pipe body (10) including a first end part (10A) and a second end part (10B). The pipe body (10) includes a pin (40) formed on the first end part (10A) and a box (50) formed on the second end part (10B). The pin (40) includes a pin contact surface (400) including a male screw part (41). The box (50) includes a box contact surface (500) including a female screw part (51). The metal pipe (1) for an oil well further comprises a Ni plating layer (100) formed on the pin contact surface (400) and/or the box contact surface (500), and a Zn-Ni alloy plating layer (110) formed on the Ni plating layer (100). The deposition amount of the Ni plating layer (100) is larger than or equal to 6.00 g/m 2.
Provided is a tin-plated steel sheet having superior yellowing resistance without conventional chromate treatment, wherein the steel sheet is used for containers and has a zirconium-containing film layer. The tin-plated steel sheet comprises: a steel sheet; a tin-plating layer disposed on at least one surface of the steel sheet; and a film layer that is disposed on the tin-plating layer and contains zirconium oxide and tin sulfide, wherein the plating amount of the tin-plating layer is 0.1 g/m2to 15 g/m2in terms of metal Sn content, and in the film layer, the plating amount of zirconium oxide is 0.2 mg/m2to 50 mg/m2in terms of metal Zr content and the plating amount of tin sulfide is 0.1 mg/m2to 5 mg/m2 in terms of sulfur content.
C25D 9/08 - Electrolytic coating other than with metals with inorganic materials by cathodic processes
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
95.
METHOD FOR MANUFACTURING ARC WELDED JOINT, ARC WELDED JOINT, AND AUTOMOTIVE COMPONENT
A method for manufacturing an arc welded joint according to an embodiment of the present invention comprises: stacking a first steel sheet and a second steel sheet in a sheet thickness direction so that an end portion of the first steel sheet is disposed on the surface of the second steel sheet; and arc-welding the end portion of the first steel sheet and the surface of the second steel sheet, the end portion being laid over the surface, to form a weld bead. The surface of the second steel sheet has a zinc-based plating. The arc welding is weaving arc welding in which the torch performs a periodically undulating motion in a direction transverse to the welding direction. The sheet thickness tL (mm) of the second steel sheet and the weaving wavelength y (mm) of the torch during weaving arc welding have values such that y/tL≤2.8 is satisfied. The width w (mm) of the weld bead and the sheet thickness tL of the second steel sheet have values such that 3.3≤w/tL≤7.0 is satisfied. During the weaving arc welding, a droplet transfer frequency D (times/second) from the torch to a molten pool and the undulation frequency f (Hz) have values such that D/f≥25 is satisfied.
The present invention provides an austenitic stainless alloy material which has excellent creep strength and excellent stress relaxation cracking resistance. An austenitic stainless alloy material according to the present disclosure contains, in mass%, 0.03% to 0.12% of C, 0.05% to 2.00% of Si, 0.05% to 3.00% of Mn, 0.03% or less of P, 0.010% or less of S, not less than 18.0% but less than 25.0% of Ni, not less than 22.0% but less than 30.0% of Cr, 0.04% to 0.80% of Co, 0.002% to 0.010% of Ti, 0.1% to 1.0% of Nb, 0.01% to 1.00% of V, not less than 0.001% but less than 0.030% of Al and 0.10% to 0.35% of N, while having a number density of precipitates having a circle-equivalent diameter of 0.5 µm to 2.0 µm of 5,000 per mm2 or more.
Provided is a threaded joint which is for a steel pipe and which can improve seizure resistance performance and manufacturability. A threaded joint 1 for a steel pipe comprises: a pin 10; and a box 20. The pin 10 has a male screw 11, an inner pin seal surface 12, and an outer pin seal surface 13. The box 20 has a female screw 12, an inner box seal surface 12, and an outer box seal surface 23. The male screw 11 includes a tapered region 111 positioned on the outer pin seal surface 13 side, and a tapered region 112 positioned on the inner pin seal surface 11 side. The gradient β1 of the tapered region 112 is smaller than the gradient α1 of the tapered region 111. The insertion surface pitch of screw threads included in the male screw 112 is constant. The screw threads included in the tapered region 112 have a screw thread width wider than that of screw threads included in the tapered region 111.
This Zn-Al-Mg hot-dip plated steel sheet comprises a steel sheet and a hot-dip plated layer formed on the surface of the steel sheet. The hot-dip plated layer has an average composition including more than 10 mass% and no more than 22 mass% of Al, 1.0-10 mass% of Mg, and a remainder of Zn and impurities. When the thickness of the hot-dip plated layer is denoted by t and a 5-mm square cross-section parallel to the surface is exposed at any of a 3t/4 position, a t/2 position, or a t/4 position from the surface of the hot-dip plated layer, the area fraction of a [Zn phase] of the plating composition in at least one cross section is less than 20%.
PHBHPMBMPLBLPMBMPHBHPMBMPLBLBL are the reflection intensities of the pattern section and the non-pattern section in the normal direction for incident light with an incidence angle of greater than 80° and less than 90°.
This hot dipped steel sheet comprises a hot dip layer that is formed on the surface of a steel sheet; the hot dip layer contains 4% by mass to 22% by mass of Al and 1.0% by mass to 10% by mass of Mg, with the balance being made up of Zn and impurities; the hot dip layer is provided with a patterned part and a non-patterned part; an element-enriched region containing an element M and an interfacial alloy layer containing Fe and Al are present at the interface between the steel sheet and the hot dip layer in the patterned part; the average concentration of the element M contained in the element-enriched region and the hot dip layer in the patterned part is 0.0010% by mass to 2% by mass; and in the element-enriched region, the element M is enriched to be twice or more of those in the hot dip layer in the patterned part, or alternatively, the element M is unevenly distributed.
patents
