| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a hot-rolled steel strip by which the hot-rolled steel strip having reduced surface defects due to recess-shaped flaws of a work roll can be manufactured even when a hard material is taken as an object. SOLUTION: In the manufacturing method for the hot-rolled steel strip, after making a slab into a rough bar by performing rough rolling with a roughing mill, the rough bar is heated with an induction heating device, successively finish-rolled with a finishing mill, and is made into the hot-rolled steel strip. In this manufacturing method, in the heating of the rough bar with the induction heating device, a local region including the nose part and its neighbor part and/or a local region including the rear end part and the neighbor part of the rough bar are heated with more weight than the regions before and after the local regions in the longitudinal direction of the rough bar, and also the heating temperature of the local regions of the rough bar is changed in accordance with the tensile strength or a surface pressure (load per unit area) of a material to be rolled and the hardness of the rolls of the finishing mill. COPYRIGHT: (C)2005,JPO&NCIPI
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