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AssigneeJfe Steel Corporation
InventorsHiroto Goto, Naoki Nakata, Yukio Kimura, Masaru Miyake, Satoshi Ueoka, Nobuo Nishiura, Sonomi Shirasaki, Takaomi Kato
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A method for manufacturing a hot-rolled steel sheet having a large thickness and a large width, a larger sheet width and a lower temperature can stably be cut at a cutting load equal to that of a conventional steel sheet having a usual sheet thickness, a usual sheet width and a usual temperature. In a rough rolling step, the steel sheet is formed so that the shortest length L (mm) from a concave portion bottom to a convex portion top of the fishtail shape satisfies Equation (1) mentioned below, and an intermediate portion between the concave portion bottom and the convex portion top, defined as a desired cutting location, is cut: (2X+30)≤L≤300 (1), in which X is a maximum deviation (mm) of the cutting location of a crop cutting machine and 0≤X≤90.
A method for manufacturing a hot-rolled steel sheet which comprises a rough rolling step and a finish rolling step and in which after the rough rolling step and before the finish rolling step, a crop portion of a front end of a steel sheet in a conveying direction is cut with a crop cutting machine, and then the steel sheet is finish-rolled in the finish rolling step to manufacture the hot-rolled steel sheet,
Dependencies are inferred from the claim text.