| 摘要 |
PROBLEM TO BE SOLVED: To restrain the development of surface flaw near the edge part of a hot-rolled steel plate obtained by applying a hot-rolling to a continuously cast slab produced with a continuous caster without bringing about a special increase of a process load. SOLUTION: In a long side 5 direction of the cast slab 1 which casts into a mold in the continuous caster and has almost rectangular cross section of the long side 5 and the short side 7, two edge parts positioned at both sides of the center part 1a are not rolled down and the cast slab 1 is drawn out while guiding with the plurality of support roll pairs. In such a way, the continuously cast slab 1 having the almost rectangular cross section of the long side 5 and the short side 7 and provided with the center part 1a including the center 2 in this long side 5 direction and the edge parts 1b at both sides of the center part 1a, is produced so that an average thicknessαof the center part 1a in the long side 5 direction and thicknessesβ<SB>1</SB>,β<SB>2</SB>of the edge parts at the position separating 10-20mm from the edge surfaces in the long side 5 direction of the edge parts 1b, satisfy the relation (α-β<SB>1</SB>)≥4mm and (α-β<SB>2</SB>)≥4mm. COPYRIGHT: (C)2006,JPO&NCIPI
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