JFE Steel Patente

A pallet monitoring system capable of identifying a grate bar that is likely to detach before the grate bar actually detaches is provided. A pallet monitoring system for monitoring a pallet of a sintering machine, the pallet having a floor surface formed by multiple grate bars includes: an imaging unit that captures an image of the multiple grate bars and generates image data; a calculation unit that calculates an inclination angle of each of the multiple grate bars based on the image data; and a determination unit that determines whether the inclination angle is greater than or equal to a predetermined threshold.

A polyester film, a laminated metal sheet, and a laminated metal container are provided which can be produced stably in an energy-saving manner at any stage of their production. For example, a polyester film, etc. is provided which has a sufficient corrosion resistance after it is subjected to a process for forming a two-piece can or the like. The polyester film contains a polyester including polyethylene terephthalate as a component. In the polyester film, net intensities of pole figures, obtained by X-ray diffractometry and indicating a crystal orientation distribution, satisfy predetermined conditions.

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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 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.

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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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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 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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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 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.