| 摘要 |
PROBLEM TO BE SOLVED: To provide a direct-feed rolling method by which no surface flaws are generated on a steel plate and the slab temperature is raised so that the slab after the casting does not need to be heated. SOLUTION: In the method for direct-feed rolling of a continuous cast slab having a composition of <=0.07 wt.% with the ratio of Mn concentration to S concentration being <=50, the slab having a solidification ratio of 10-50% is cooled in a continuous casting machine at a cooling speed of >=10 deg.C/sec, the surface temperature thereof is dropped to <=700 deg.C and maintained at <=700 deg.C for 15 seconds. Then, the cooling speed is adjusted and the slab surface temperature is returned to >=900 deg.C, and then the slab is straightened to a flat shape and cut to a predetermined length by a cutting machine on the outlet side of the continuous casting machine, and hot-rolled within 30 minutes after the cutting.
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