| 摘要 |
PROBLEM TO BE SOLVED: To provide a method and equipment for hot-rolling for hot-rolled steel strips by which ferritic particles are adequately micronized and further more, the control of intermediate temperature (or cooling stopping temperature) is accurately performed by combining rapid cooling and slow cooling. SOLUTION: In the rolling method of the hot-rolled steel strip in which a slab is made into a rough bar with a roughing mill, the rough bar is made into the hot-rolled steel strip by performing finish rolling with a finishing mill, after that, the hot-rolled steel strip is conveyed on a hot run table and coiled with a coiler, this rolling method of the hot-rolled steel strip is provided with a heating stage where the rough bar is heated over the whole in the width direction between the final stand of the roughing mill and the final stand of the finishing mill and a cooling stage including rapid cooling by which the finish-rolled hot-rolled steel strip is cooled at >=200 deg.C/s by at least one or more cooling systems.
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