| 摘要 |
PROBLEM TO BE SOLVED: To reduce occurrence of surface defects over the whole region in the width direction of a slab by optimizing the distribution of draft in the width direction when manufacturing a steel plate by hot-rolling the slab. SOLUTION: Accordingly to this method, in the first pass of a rough rolling, the draft in the edge parts within 1/9 of the slab width from both ends in the width direction of the slab is increased as approaching the edge part ends and also the draft in the middle part on the side of the middle in the width direction from the edge parts is taken as a constant in the width direction and the average draft re of the edge parts is made larger than the average draft rc in the middle part. By further optimizing the distribution of the draft in the width direction, the distribution in the width direction of the stress in the rolling direction in the outer layer of the slab is equalized and the generation of the surface defects is reduced over the whole region in the width direction of the slab. COPYRIGHT: (C)2007,JPO&INPIT
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