H-section steel manufacturing method and H-section steel products

摘要

PROBLEM TO BE SOLVED: To make an operation design condition more efficient than a conventional one; to improve the ability of biting during rolling and shaping; and to suppress occurrence of a product flaw.SOLUTION: A manufacturing method of H-shaped steel includes a rough rolling step, an intermediate rolling step, and a finish rolling step. A plurality of calibers to shape a rolled material are craved on a rolling mill performing the rough rolling step. The plurality of the calibers include: a plurality of wedging calibers in which projection parts to have division parts formed at an end of the rolled material are formed by making a wedge vertical to a width direction of the rolled material; and a plurality of bending calibers in which projection parts which abut on the wedge and sequentially bend the division parts formed in the wedging calibers are formed. The rough rolling step by the plurality of the calibers is performed by two-heat rolling, and bending shaping by at least one bending caliber among the plurality of the bending calibers that perform bending shaping is included in shaping during the second heat rolling.SELECTED DRAWING: Figure 8