JFE Steel Patente

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There are provided a method for determining a decarburization treatment end, vacuum degassing equipment, a method for operating vacuum degassing equipment, and a method for producing molten steel capable of estimating the carbon content in molten steel with high accuracy by properly utilizing exhaust gas measurement values to end the decarburization treatment at appropriate timing. A method for determining a decarburization treatment end for determining an end of decarburization treatment when vacuum degassing treatment including the decarburization treatment is performed by placing molten steel in a reduced-pressure environment includes: dividing the decarburization treatment into two stages of first half decarburization treatment M1 and latter half decarburization treatment M2, and estimating the carbon contents in molten steel in the first half decarburization treatment M1 and the latter half decarburization treatment M2 using different estimation models for the carbon content in molten steel for the first half decarburization treatment M1 and the latter half decarburization treatment M2, in the first half decarburization treatment M1, using the estimation model constructed based on machine learning for actual operation result data (S3), and, in the latter half decarburization treatment M2, determining the end of the decarburization treatment when an estimated value of the carbon content in molten steel has reached a target value (S7).

There is provided a press-forming method excellent in shape fixability and dimensional accuracy variation capable of stably mass-producing a component close to the target component shape. A method for manufacturing a press-formed article includes manufacturing a product having a curved portion curved convexly or concavely to the side of a top sheet portion in a cross section of a U-shape or the like. The method includes: a first step (2A) of forming an intermediate component (10) using a die with a first radius of curvature (R1) smaller than a top sheet radius of curvature (R0) in a product shape as a top sheet forming radius of curvature; and a second step (2B) of press-forming the intermediate component (10) using a die with a second radius of curvature (R2) equal to or larger than the top sheet radius of curvature (R0) in the product shape as a top sheet forming radius of curvature, in which the first radius of curvature (R1) is set such that a top sheet radius of curvature (R1') after die release of the intermediate component (10) is less than the top sheet radius of curvature (R0), and the first radius of curvature (R1) and the second radius of curvature (R2) are adjusted based on strain caused by the forming in the first step (2A) and the second step (2B).

A conveyance state of an article to be conveyed on a belt is automatically detectable. A conveyance state detection device (21) that detects a conveyance state of a raw material (2) on each belt (3) of a plurality of belt conveyors (1) that conveys the raw material (2), the device includes: an imaging device configured to image the belt (3) that conveys the article to be conveyed from above; and a conveyance state detection unit (10) that detects the conveyance state of the raw material (2) on the belt (3) by performing image processing on a captured image captured by the imaging device.

A vehicle body structure 1 according to the present invention includes: a pair of left and right front side members 11 extending in a vehicle front-rear direction and having a closed cross section structure; and a crash box 21 extending from a distal end of each of the front side members 11 toward a vehicle front side and having a closed cross section structure, in which a plate thickness and a tensile strength of a metal plate used for each of the front side member 11 and the crash box 21 are set such that a ratio F<x1>/F<x2> between an axial force F<x1> of a cross section where a line length in a cross-sectional direction is the minimum of the closed cross section structure in the crash box 21, and an axial force F<x2> of a cross section where a line length in a cross-sectional direction is the minimum of the closed cross section structure in the front side member 11, is equal to or less than a predetermined critical ratio of axial force.

Provided is a mold powder for continuous casting that enables production of high-quality cast steel and prevention of operational problems when continuously casting high-Al steel. The mold powder for continuous casting has a chemical composition including at least one oxide selected from the group consisting of CaO, BaO, MgO, La<2>O<3>, and ZrO<2>, aggregate carbon, Al<2>O<3>, fluorine compound, and Li<2>O, with the balance being inevitable impurity. Al<2>O<3> content is 25 mass% to 35 mass%, total content of Ca, Ba, Mg, La, and Zr as oxide equivalent is 40 mass% to 60 mass%, F content is 3 mass% to 10 mass%, Li content as Li<2>O equivalent is 6 mass% to 12 mass%, total content of the inevitable impurity is 0 mass% to 2.0 mass%, and Y, expressed as -12.7 × (%C) + 51.8, is 5 to 35.

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An underbody structure for a battery electric vehicle according to the present invention includes: a pair of left and right side sills 10; a battery pack 20 disposed between the side sills 10; a floor cross member 30 having a groove shape extending linearly in a vehicle width direction; and a ground-side cross member 40 having a groove shape extending in the vehicle width direction, in which the side sills 10 each include a side sill inner 11 having a hat cross section and a side sill outer 13 having a groove shape. A side portion 11a of the side sill inner 11 and a surface portion 30a provided at an end of the floor cross member 30 in the vehicle width direction have substantially the same cross section orthogonal to a vehicle front-rear direction, and the side sill inner 11 is disposed such that ridge line sections 11b in a vehicle vertical direction overlap an upper end edge and a lower end edge of the surface portion 30a of the floor cross member 30.

A manufacturing method of an automobile part 1 according to the present invention includes: a resin application step S1 of applying resin 7 to a steel sheet 11 before molding; a steel sheet patch installation step S3 of installing a steel sheet patch 13 on the steel sheet 11 to which the resin 7 is applied in such a manner as to cover the resin 7; a pre-baking step S5 of pre-baking a sandwich structure member 15 having a sandwich structure in which the resin 7 is sandwiched between the steel sheet 11 and the steel sheet patch 13 in such a manner that the resin 7 has an elastic modulus of 45 MPa or more and ductility of 10% or more; and a press molding step S7 of press molding the pre-baked sandwich structure member 15 into a part shape of the automobile part 1.

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