JFE Steel Patente

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A metal material is electrolyzed while an electrolyte is flown. In this manner, precipitates and/or inclusions (precipitates and the like) in the metal material can be accurately extracted with ease. The electrolyzing is preferably performed while the electrolyte is flown along at least part of an electrolysis surface of the metal material, the electrolysis surface being a surface to contact the electrolyte. A flow velocity of the electrolyte flowing along the electrolysis surface is preferably not lower than 0.48 mm/s. It is preferable that the metal material and the electrolyte are stored in an electrolytic cell, and the electrolyte is injected into and discharged from the electrolytic cell, whereby the electrolyte is flown.

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Provided is a method for repairing a coke oven by replacing, in a hot condition, bricks of one combustion chamber that compose the coke oven or bricks of a plurality of continuous combustion chambers that compose the coke oven with two or more oven wall bricks and binder bricks along an oven longitudinal direction from an oven mouth. This method includes: a confirmation step in which a three-dimensional measurement device is used to observe, from the oven mouth, concavity and convexity of an oven wall of a neighboring non-replacement target combustion chamber that is adjacent to one side surface of one replacement target combustion chamber or a plurality of continuous replacement target combustion chambers, and concavity and convexity of an oven wall of a neighboring non-replacement target combustion chamber that is adjacent to the other side surface of the one replacement target combustion chamber or plurality of continuous replacement target combustion chambers, thereby confirming that bulging amounts of the oven walls of the neighboring non-replacement target combustion chambers are each smaller than a given value; and a replacement step in which when the bulging amounts of the oven walls of the neighboring non-replacement target combustion chambers have each been confirmed to be smaller than the given value in the confirmation step, a portion of an oven wall of the one replacement target combustion chamber or plurality of continuous replacement target combustion chambers, which requires repair, is dismantled, followed by newly stacking oven wall bricks and binder bricks in the dismantled area.

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Provided is a method for repairing a coke oven that includes: a confirmation step in which a three-dimensional measurement device is used to observe, from an oven mouth, concavity and convexity of an oven wall of a neighboring non-replacement target combustion chamber that is adjacent to one side surface of one replacement target combustion chamber or a plurality of continuous replacement target combustion chambers, and concavity and convexity of an oven wall of a neighboring non-replacement target combustion chamber that is adjacent to the other side surface of the one replacement target combustion chamber or plurality of continuous replacement target combustion chambers, thereby confirming that bulging amounts of the oven walls of the neighboring non-replacement target combustion chambers are each smaller than a given value; a replacement step in which when the bulging amounts of the oven walls of the neighboring non-replacement target combustion chambers have each been confirmed to be smaller than the given value in the confirmation step, a portion of an oven wall of the one replacement target combustion chamber or plurality of continuous replacement target combustion chambers, which requires repair, is dismantled, followed by newly stacking oven wall bricks and binder bricks in the dismantled area; and a step of using a previously formed oven wall refractory aggregate and a previously formed ceiling part refractory aggregate as a newly stacked oven wall and ceiling part in the replacement target combustion chamber.

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There is provided a method for assessing a slab, which method can determine, based on component concentrations in molten steel manufactured by a continuous casting machine, the risk that a slab manufactured from the molten steel will split into two pieces. A method for assessing a slab containing Ti, C, Si, and Mn as components and manufactured using a continuous casting machine includes a first step of determining the index of a liquid fraction of scale formed on the slab using component concentrations in molten steel poured into a mold of a continuous casting machine, and a second step of determining that the slab is at risk of splitting into two pieces when the index of the liquid fraction of the scale is greater than or equal to a predetermined threshold value.

An automotive component designing method according to the present invention includes: acquiring an automotive component model obtained by modeling an automotive component subjected to a compressive load in a longitudinal direction at a time of collision of an automobile (S1); setting a design space in a design target portion to be a design target (S3); generating a design target portion model obtained by modeling the set design space with a shell element and/or a solid element (S5); setting objectives that maximize a buckling load in a primary buckling mode obtained by linear buckling analysis in the automotive component model (S7); executing optimization analysis for obtaining an optimized shape of the design target portion model that satisfies the set objectives (S9); and determining a shape of the design target portion based on the optimized shape of the design target portion model (S11).

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Provided is such a hot-rolled annealed sheet for a non-oriented electrical steel sheet that this hot-rolled annealed sheet is capable of realizing both sheet fracture prevention during cold rolling and excellent magnetic properties after performing cold-rolled sheet annealing. This is because this hot-rolled annealed sheet is configured in a manner such that an average crystal grain size on a cross-sectional surface thereof in a rolling direction after pickling is 40 to 250 µm, and that an integrated intensity of an Fe-Al-based oxide on a steel sheet surface layer is 200 cps·deg or lower when measured by X-ray diffraction. Such configuration is either achieved by obtaining a hot-rolled annealed sheet after heating and hot rolling, under given conditions, a steel slab containing given amounts of C, Si, Mn, P, S, Al, N, O, Sn, and Sb, and then by performing shot blasting and then pickling on the sheet; or is achieved by obtaining a hot-rolled annealed sheet after heating and hot rolling, under given conditions, the above steel slab, and then by performing brush grinding and then pickling on the sheet. Further, a non-oriented electrical steel sheet can be manufactured using the above hot-rolled annealed sheet.

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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).

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.

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.

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