| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing a hot-rolled steel strip having homogenous material at high yield by keeping constant the temperature of the hot- rolled steel strip on the inlet side of a finishing mill, finish rolling conditions and cooling rate on a run out table constant over the length direction of the hot-rolled steel strip. SOLUTION: In the rolling method of the hot-rolled steel strip by which, after a slab heated to a specified temperature is rough rolled with a roughing mill and, next, the finish rolling of the rough bar 2 is performed with a continuous hot finishing mill 5, the hot-rolled steel strip having a prescribed thickness is manufactured by cooling it on a cooling stand 8, the rough bar 2 which is rough rolled is heated so as to be uniform temperature in the length direction with an induction heating device 3 provided on the inlet side of the finishing mill 5 and the finish rolling is performed by passing the rough bar 2 which is heated uniformly like this through the finishing mill 5 at a constant speed. Next, the hot-rolled steel strip is passed through the cooling stand 8 at a constant speed and the average cooling rate during the hot-rolled steel strip is advanced from the position of a thermometer 6 on the outlet side of the finishing mill to the position of a thermometer 9 for coiling is maintained at the uniform cooling rate.
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