Abstract: A non-oriented electrical steel sheet is provided which has a chemical composition including, in mass %, C: 0.0010 to 0.0050%, Si: 1.50% or less, Mn: 0.10 to 1.50%, sol. Al: 0.010 to 0.040%, Ti: 0.0030% or less, Nb: 0.0030% or less, V: 0.0030% or less, Zr: 0.0030% or less, N: 0.0030% or less, S: 0.0040% or less, B: 0.0045% or less, and the balance: Fe and impurities, and which satisfies [0.0020?Ti+Nb+V+Zr?0.0120], [0.5?B/N?1.5], [sol. B?0.0005], and [NAlN?0.0005].

Abstract: A method for producing a metal ingot by using an electron-beam melting furnace including an electron gun and a hearth that accumulates a molten metal of a metal raw material, in which, in a downstream region between an upstream region in which the metal raw material is supplied onto the surface of the molten metal and a first side wall, an irradiation line is disposed so as to block a lip portion and so that two end portions are positioned in the vicinity of the side wall of the hearth. A first electron beam is radiated onto the surface of the molten metal along the irradiation line, such that the surface temperature (T2) of the molten metal along the irradiation line is made higher than the average surface temperature (T0) of the entire surface of the molten metal in the hearth.

Abstract: A method of producing a ferritic heat-resistant steel welded joint, the method including: a multi-layer welding step in which a ferritic heat-resistant steel base material including B at 0.006% by mass to 0.023% by mass is multi-layer welded using a Ni-based welding material for heat-resistant alloy, wherein root pass welding is performed under a welding condition such that a ratio of an area [SBM] that has been melted of the ferritic heat-resistant steel base material to an area [SWM] of a weld metal, in a transverse cross-section of a weldment after the root pass welding but before second pass welding in the multi-layer welding step, satisfies the following formula (1): 0.1?[SBM]/[SWM]??50×[% BBM]+1.3, with respect to a mass percent of B, [% BBM], which is included in the ferritic heat-resistant steel base material.

Abstract: The martensitic stainless steel material has a chemical composition, which contains: in mass %, C: 0.030% or less, Si: 1.00% or less, Mn: 1.00% or less, P: 0.030% or less, S: 0.005% or less, Al: 0.010 to 0.100%, N: 0.0010 to 0.0100%, Ni: 5.00 to 6.50%, Cr: 10.00 to 13.40%, Cu: 1.80 to 3.50%, Mo: 1.00 to 4.00%, V: 0.01 to 1.00%, Ti: 0.050 to 0.300%, Co: 0.300% or less, Ca: 0.0006 to 0.0030%, and O: 0.0050% or less, and satisfies Formulae (1) and (2) in the description. An area of each intermetallic compound and each Cr oxide in the steel material is 5.0 ?m2 or less, a total area fraction of intermetallic compounds and Cr oxides is 3.0% or less, and a maximum circle-equivalent diameter of Ca oxide is 9.5 ?m or less.

Abstract: The present invention has as its object to provide a method for manufacturing a shaped part able to suppress the occurrence of shaping defects when manufacturing a tubular shaped part. The above object is achieved by providing a method for manufacturing a shaped part comprising a first bending process of press-forming a metal sheet to obtain a curved intermediate part curved in a longitudinal direction by a curvature ?, a U-process of press-forming the curved intermediate part into an approximately U-section to obtain a first curved U-section intermediate part provided with a bottom part having the curvature ?, and an O-process of press-forming the first curved U-section intermediate part to form a closed cross-section to obtain a tubular shaped part provided with a bottom part having the curvature ?.

Abstract: A manufacturing method of a press-formed article (200) including: press-forming a metal sheet into a preformed article (100) including a preformed bottom sheet portion (110), a first preformed standing wall portion (120a), a second preformed standing wall portion (120b), a preformed ridge portion (130) provided between the first preformed standing wall portion (120a) and the second preformed standing wall portion (120b), and a swollen portion (140) provided between the preformed bottom sheet portion (110) and the first and second preformed standing wall portions (120a) and (120b); and press-forming the preformed article (100) into a press-formed article (200) including a bottom sheet portion (210), a first standing wall portion (220a) adjacent to the bottom sheet portion (210), a second standing wall portion (220b) adjacent to the bottom sheet portion (210), and a ridge portion (230) provided between the first standing wall portion (220a) and the second standing wall portion (220b).

Abstract: A long structural member that, in a transverse section of one part or all of the long structural member in a longitudinal direction, includes the following configuration. A top plate part, a first flange part, and a second flange part are flat. A first side plate part, a first upper corner part, and a first lower corner part constitute a first thick-wall part. A thickness of the first thick-wall part is greater than a thickness of the top plate part and is greater than a thickness of the first flange part. A second side plate part, a second upper corner part, and a second lower corner part constitute a second thick-wall part. A thickness of the second thick-wall part is greater than the thickness of the top plate part and is greater than a thickness of the second flange part.

Abstract: This wound core is a wound core including a substantially rectangular wound core main body in a side view, wherein, in the wound core main body, first planar portions and corner portions are alternately continuous in a longitudinal direction, each corner portion has a curved shape in a side view of the grain-oriented electrical steel sheet, two or more bent portions having a second planar portion between the adjacent bent portions are provided, and in at least one of the first planar portion and second planar portion in the vicinity of the bent portion, the following Formula (1) is satisfied: (Nac+Nal)/Nt?0.010??(1) here, Nt is a total number of grain boundary determination locations in the first planar portion and second planar portion region adjacent to the bent portion, and Nac and Nal each are a number of determination location at which subgrain boundaries are able to be identified in a direction parallel to and direction perpendicular to the bent portion boundary.

Abstract: In this method of producing a wound core, at least one bent portion (5) of one or more laminated grain oriented electrical steel sheets (1) is formed such that one side (1b) of the steel sheet (1) is placed and constrained on a die (30) and a punch (40) is press formed against a portion (1a) of the steel sheet (1) to be bent on the other free end side in the thickness (T) direction of the steel sheet. Outer surfaces of the die and the punch each have an arc portion (30a, 40a) having a predetermined curvature, and when the thickness of the steel sheet (1) is T, bent angles of the bent portions (5) are ?(°), a radius of curvature of the arc portion (30a) of the die is Rd, and a radius of curvature of the arc portion (40a) of the punch is Rp, relationships of Equations (1) to (5) below are satisfied. 0.02?T/(2Rd+T)?0.15 ??(1) 0.5 ?Rd ?3.0 ??(2) 0.15 ?T ?0.30 ??(3) 2.

Abstract: A coated steel product including a base steel, and a coating layer containing a Zn—Al—Mg alloy layer disposed on a surface of the base steel, in which the coating layer has a predetermined chemical composition, the coated steel product including dendrite-shaped MgZn2 phase having a surface roughness Sa of 50 nm or less on a surface of the Zn—Al—Mg alloy layer, an area ratio of the dendrite-shaped MgZn2 phase having a surface roughness Sa of 50 nm or less being from 30% to 80% within a region of an observable field of view of 5 mm2, and among the dendrite-shaped MgZn2 phase having a surface roughness Sa of 50 nm or less, a number of dendrite-shaped MgZn2 phase having an area of 0.1 mm2 or more being from 5 to 100 within a region of an observable field of view of 25 mm2.

Abstract: In a threaded connection of a two-step thread construction including intermediate shoulder surfaces, a break is prevented near the intermediate critical cross sections upon application of a tensile load, and the intermediate shoulder surfaces are easier to create, thus improving productivity. The outer periphery portion of a pin located between an intermediate shoulder surface of the pin and a second male thread is provided with a circumferential groove including a curved surface smoothly contiguous to the intermediate shoulder surface, thereby mitigating plastic strains generated near the pin intermediate critical cross section PICCS. The inner periphery portion of a box located between an intermediate shoulder surface of the box and a first female thread is provided with a circumferential groove including a curved surface smoothly contiguous to the intermediate shoulder surface, thereby mitigating plastic strains generated near a box intermediate critical cross section BICCS.

Abstract: A coated steel member includes: a steel sheet substrate containing, as a chemical composition, by mass %, C: 0.25% to 0.65%, Si: 0.10% to 1.00%, Mn: 0.30% 1.00%, P: 0.050% or less, S: 0.0100% or less, N: 0.010% or less, Ti: 0.010% to 0.100%, B: 0.0005% to 0.0100%, Nb: 0.02% to 0.10%, Mo: 0.10% to 1.00%, Cu: 0.15% to 1.00%, and Ni: 0.05% to 0.25%; and a coating formed on a surface of the steel sheet substrate and containing Al and Fe. The maximum Cu content in a range from the surface to a depth of 5.0 ?m is 150% or more of the Cu content of the steel sheet substrate.

Abstract: Threaded tubular connection comprising a tubular female end extending from a main body of a first tubular member, and a tubular male end extending from a main body of a second tubular member, such that the tubular female end comprises a machined outer cylindrical surface close to the female free end having a first outer diameter and a second machined outer cylindrical surface above a threaded portion of the female end, a second outer diameter of the second outer cylindrical surface being bigger than the first outer diameter.

Abstract: A Ni diffusion-plated steel sheet of the present invention includes a base steel sheet and a Fe—Ni diffusion alloy-plating layer positioned on at least one surface of the base steel sheet, a Ni coating weight of the Fe—Ni diffusion alloy-plating layer is 9.0 to 35 g/m2, a Fe concentration Cs of an outermost layer of the Fe—Ni diffusion alloy-plating layer is 10 to 55 mass %, the base steel sheet has a predetermined chemical composition, and a ferrite grain size number specified by JIS G 0551 (2013) of the base steel sheet is 10.0 or more.

Abstract: The present invention relates to a hot stamped body comprising a steel sheet and a plating layer formed on at least one surface of the steel sheet, wherein the plating layer is comprised of a ZnO region present on a surface side of the plating layer and having an oxygen concentration of 10 mass % or more and an Ni—Fe—Zn alloy region present on a steel sheet side of the plating layer and having an oxygen concentration of less than 10 mass %, and an average concentration of a total of Fe, Mn and Si in the ZnO region is more than 0 mass % and less than 5 mass %.

Abstract: This steel sheet is a steel sheet (100) formed by causing end surfaces of a first sheet material (111) and a second sheet material (113) to abut each other in an in-plane direction and welding the first sheet material (111) and the second sheet material (113) via a strip-shaped welded part (115), and in which a softened part (120) that is softened more than other parts in the welded part (115) is formed in at least a part of the welded part (115), and on a first end surface of the steel sheet in which an end part of the welded part (115) in a longitudinal direction is formed, a region in which the softened part (120) is not formed is provided in at least a part of the end part of the welded part (115) in the longitudinal direction, and a maximum value of a depth of the softened part (120) in a sheet thickness direction is, as a ratio to a sheet thickness of the steel sheet (100), 50% or less.

Abstract: Provided are a roughly-shaped steel material for a nitrided part, and a nitrided part obtained by nitriding the roughly-shaped steel material for a nitrided part, having a determined chemical composition, in which the portion with a diameter or width ranging from 60 to 130 mm of the roughly-shaped steel material for a nitrided part has a microstructure at a depth of 14.5 mm from a surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 70 to 100%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite; and has a microstructure at a depth of 15 mm or more from the surface including, in terms of area fraction: tempered martensite and tempered bainite in total: from 0 to less than 50%; remaining austenite: from 0 to 5%; and a balance: ferrite and perlite.

Abstract: A control system is a control system of casting and rolling equipment having a twin roll-type continuous casting machine, a rolling mill, and a conveyor. The control system includes a rolling mill control unit that controls the rolling mill by any one of controls including a rolling control and an open control, a conveyor control unit that controls the conveyor by any one of controls including a tension control and a speed control, a first control unit that controls to perform the rolling control and the tension control, a second control unit that controls to perform the open control and the speed control, and a third control unit that controls to resume the tension control and the rolling control.

Abstract: There is provided a method for identifying thrust counterforce working point positions of backup rolls of a rolling mill, the method including: changing at least either friction coefficients and inter-roll cross angles between the rolls with an unchanged kiss roll load to cause thrust forces at a plurality of levels to act between the rolls, and measuring thrust counterforces in a roll-axis direction acting on rolls forming at least one of roll pairs other than a roll pair of the backup rolls and measuring backup roll counterforces acting in a vertical direction on the backup rolls at reduction support positions in a kiss roll state; and identifying, based on the measured thrust counterforces, thrust counterforce working point positions of thrust counterforces acting on the backup rolls, using first equilibrium conditional expressions relating to forces acting on the rolls and second equilibrium conditional expressions relating to moments acting on the rolls.

Abstract: A shearing method of a plate-shaped workpiece for applying a shear force in a thickness direction of the plate-shaped workpiece includes: a step for starting applying the shear force on the workpiece with a clearance between action points in a surface direction orthogonal to the thickness direction of the workpiece; a step for applying the shear force after the start of applying the shear force until a fractured surface is created in the workpiece; and a step for increasing the clearance depending on a deformation of the workpiece in the thickness direction after starting applying the shear force until the fractured surface is created in the workpiece.