Abstract: The steel sheet contains, as a chemical composition, by mass %, C: 0.040% to 0.100%, Mn: 1.00% to 2.00%, Si: 0.005% to 1.500%, P: 0.100% or less, S: 0.0200% or less, Al: 0.005% to 0.700%, N: 0.0150% or less, O: 0.0100% or less, and a remainder: Fe and impurities, in which an arithmetic mean waviness Wa is in a range of 0.10 to 0.30 ?m.

Abstract: An electronic component including an element main body including an insulation layer and an electrode layer inside the element main body.

Abstract: A dielectric composition includes a main-phase particle and segregation particles. The main-phase particle includes a main component having a perovskite crystal structure represented by a general formula of ABO3. The dielectric composition includes RA, RB, M, and Si. Each of A, B, RA, RB, and M is one or more elements selected from a specific element group. Each of an RA content CRA to the main component, an RB content CRB to the main component, an M content to the main component, and a Si content to the main component is within a predetermined range. 0.50<(?/?)/(CRA/CRB)?1.00 is satisfied, where a is an average RA content (mol %) and ? is an average RB content (mol %) of specific segregation particles mainly including RA, RB, Si, Ba, and Ti in the segregation particles.

Abstract: A dielectric composition includes a main phase, first segregation phases, and second segregation phases. The main phase includes a main component having a perovskite crystal structure of ABO3 (A is one or more selected from Ba, Sr, and Ca, and B is one or more selected from Ti, Zr, and Hf). The first segregation phases include RE (one or more selected from rare earth elements), A, Si, Ti, and O. The second segregation phases include RE, A, Ti, and O and do not substantially include Si. 0.10<S2/S1?1.50 is satisfied on a cross section of the dielectric composition, where S1 is an area ratio of the first segregation phases, and S2 is an area ratio of the second segregation phases.

Abstract: A blank (100) includes a main portion (110) that is made of steel having a tensile strength of 1450 MPa or more and a softened portion (120), the ratio of Vickers hardness of the softened portion (120) to the Vickers hardness of the main portion (110) is 0.7 or more and 0.95 or less, and the softened portion (120) is disposed at a position different from a position of the main portion (110) in an in-plane direction. A structural member (200) includes a first member (210), a second member (220), and a weld (W) at which the first member (210) and the second member (220) are welded to each other.

Abstract: A production method for a steel component includes preparing a patchwork material including steel sheets that are laid one on another, at least one of overlap surfaces of the steel sheets including a zinc-based plating layer, heating the patchwork material, and performing hot stamping on the patchwork material heated to form the steel component in which a joint part between the steel sheets is disposed in a bent area. When tout denotes a sheet thickness of a steel sheet located on an outer side in the bent area, and tin denotes a sheet thickness of a steel sheet located on an inner side, tout/tin?1.1 is satisfied. The joint part is disposed in a ridge portion or at a position in a vicinity of the ridge portion, and the position satisfies d/tin<8.2, where d denotes a distance from the ridge portion to the joint part.

Abstract: A blank sheet which is a material for an outer plate component for an automobile includes a steel sheet. A rolling direction of the steel sheet extends along a longitudinal direction of the blank sheet, and a thickness is 0.6 mm or less. The steel sheet may have a chemical composition in which arithmetic average waviness Wa is 0.10 to 0.30 ?m. The steel sheet may have a chemical composition in which ?C calculated from C20 that is a C content at a depth position of 20 ?m from a surface, C60 that is a C content at a depth position of 60 ?m from the surface, and Expression (1) is 0.20 to 0.90 mass %/mm, and a tensile strength is 500 MPa or greater, ?C=(C60?C20)/(0.04)??(1).

Abstract: An objective of the present invention is to provide a steel sheet having a high strength which can provide excellent appearance quality. The steel sheet has a chemical composition including, in mass %, C: more than 0.030% to 0.145%, Si: 0% to 0.500%, Mn: 0.50% to 2.50%, P: 0% to 0.100%, S: 0% to 0.020%, Al: 0% to 1.000% or less, N: 0% to 0.0100%, and the like, wherein a metal micro-structures consisting of 70 to 95% of ferrite in volume fraction and 5 to 30% of hard phases in volume fraction, and a value X1 obtained by dividing a standard deviation of average Mn concentrations in a rolling direction at ¼ sheet-thickness positions in a sheet thickness direction by an average Mn concentration at the ¼ sheet-thickness positions is 0.025 or less.

Abstract: There is provided a steel sheet that delivers an excellent appearance quality in its formed product. The steel sheet has a chemical composition including, in mass %, C: 0.030% to 0.145%, Si: 0% to 0.500% or less, Mn: 0.50% to 2.50%, P: 0% to 0.100%, S: 0% to 0.020%, Al: 0% to 1.000%, N: 0% to 0.0100%, and the like, wherein a metal micro-structure consists of 70 to 95% ferrite in volume fraction and 5 to 30% hard phases in volume fraction, and a value X1 obtained by dividing a standard deviation of Vickers hardnesses H1/4 at ¼ sheet-thickness positions by an average value of the Vickers hardnesses H1/4 is 0.025 or less, and a value X2 obtained by dividing a standard deviation of Vickers hardnesses H1/2 at a ½ sheet-thickness position by an average Value of the Vickers hardnesses H1/2 is 0.030 or less.

Abstract: A burring processing method including increasing a diameter of a prepared hole provided in a metal component and bending a part of the metal component to form a burring processed portion (110) including an upright portion (120) and a curved portion (130), wherein in a cross-section that passes through an axis (cb) of the burring processed portion (110) and is parallel to the axis (cb) of the buffing processed portion (110), a cross-sectional shape of the curved portion (130) on an inner surface of the curved portion consists of a curve, and a length of the curved portion (130) in a direction perpendicular to the axis (cb) of the burring processed portion (110) is at least 1.2 times a height of the curved portion in a direction parallel to the axis (cb) of the burring processed portion (110).

Abstract: A dielectric ceramic composition includes main phase grains and a grain boundary. The main phase grains include a perovskite compound as a main component. The perovskite compound includes at least Ca, Sr, Zr, and Ti. The dielectric ceramic composition further includes an oxide of at least one additional element. The dielectric ceramic composition has a total content of Ti, Mn, and Cr of 7.0 parts by mol or less. The main phase grains include a specific main phase grain. The specific main phase grain includes a first minute region having a high total content of Mn and Cr and a second minute region having a low total content of Mn and Cr. The first minute region is located in a peripheral portion of the specific main phase grain. The second minute region is located in a central portion of the specific main phase grain.

Abstract: A dielectric ceramic composition includes main phase grains and a grain boundary between the main phase grains. The main phase grains include a perovskite compound as a main component. The perovskite compound includes at least Ca and Sr as A-site elements and at least Zr and Ti as B-site elements. The dielectric ceramic composition further includes an oxide of at least one additional element. ?/? is 3.0 or more and 6.0 or less, where ? (unit: parts by mol) denotes a content of the at least one additional element of the dielectric ceramic composition with respect to 100 parts by mol B-site elements, and ? (unit: parts by mol) denotes a content of the at least one additional element of the grain boundary with respect to 100 parts by mol B-site elements.

Abstract: Provided is a hot press apparatus (1000) including a punch (1200), a die (1300), and a die pad (1100), in which a groove portion (1220) is provided in a top surface (1210) of the punch (1200), in which, in a cross section in a press direction (P), an angle between a wall surface of the groove portion (1220) and the press direction (P) is 2° to 8°, in which a refrigerant flow path is provided inside the punch (1200), in which the die (1300) and the die pad (1100) are disposed to face the punch (1200) in the press direction (P), the die pad (1100) is disposed facing the top surface (1210) of the punch (1200), and a protrusion (1120) is provided at a position on the die pad (1100) opposing the groove portion (1220) in the press direction (P), and the protrusion (1120) has an inverted shape of the groove portion (1220).

Abstract: Provided is a steel sheet having a chemical composition comprising C: 0.020 to 0.100%, Mn: 1.00 to 2.50%, P: 0.100% or less, S: 0.0200% or less, Al: 0.005 to 0.700%, N: 0.0150% or less, O: 0.0100% or less, etc., and a balance of Fe and impurities, and a microstructure comprising, by area %, ferrite: 70 to 97% and a hard phase: 3 to 30%, wherein an Str of the surface is 0.35 to 0.75, and a difference ?Str of the Str and the Str after imparting 5% tensile strain is 0.15 or less.

Abstract: A structural part includes a part body and a cylindrical bush. The part body includes a through-hole and a cylindrical flange part provided in the periphery of the through-hole. The bush is inserted into the through-hole and the flange part. When seen in a cross section including a central axis of the bush, the flange part has a height difference between a first part that contacts the bush on one side in a direction perpendicular to the central axis and a second part that contacts the bush on the other side.

Abstract: A top sheet (210), two walls (221, 222), and two ridge portions (231, 232) are provided, tensile strengths of the top sheet (210) and the walls (221, 222) are 1470 MPa or more, each of the two ridge portions (231, 232) extend between the top sheet (210) and the walls (221, 222), in a longitudinal direction of the top sheet (210), and a cross section of a center portion in the longitudinal direction is an open cross section having a groove shape.

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: The steel sheet contains, as a chemical composition, by mass %, C: 0.040% to 0.100%, Mn: 1.00% to 2.00%, Si: 0.005% to 1.500%, P: 0.100% or less, S: 0.0200% or less, Al: 0.005% to 0.700%, N: 0.0150% or less, O: 0.0100% or less, and a remainder: Fe and impurities, in which an arithmetic mean waviness Wa is in a range of 0.10 to 0.30 ?m.

Abstract: Provided is a steel sheet having a predetermined chemical composition, wherein an index A represented by 10[C]+0.3[Mn]?0.2[Si]?0.6[Al]?0.05[Cr]?0.2[Mo] is 1.10% or less, and a microstructure comprising, by area %, ferrite: 70 to 95%, and a hard phase: 5 to 30%, wherein a maximum connected length of the hard phase in a rolling direction at a sheet thickness 1/2 position is 80 ?m or less, and a maximum connected length of the hard phase in a rolling direction at a sheet thickness 1/4 position is 40 ?m or less.

Abstract: A laser machining apparatus includes a laser device, an image processing part, and an irradiation controller. The laser device irradiates a surface of a machining object with a laser beam. The image processing part divides an image for drawing with respect to the surface of the machining object into a plurality of gradations and creates a plurality of layer according to the plurality of gradations. The irradiation controller draws a layer on the surface of the machining object by scanning and linearly irradiating each of the plurality of layer with a laser beam in a single direction.