| 摘要 |
PROBLEM TO BE SOLVED: To reduce the center segregation of a cast slab even when the withdrawal speed of the cast slab is changed in a continuous casting method in which reduction is carried out after bulging. SOLUTION: This method is a continuous casting method by which rolling reduction which is not larger than an equivalent amount to the bulging is given to rolling reduction rolls after the bulging caused on the cast slab and, when changing the withdrawal speed of the cast slab, rolling reduction D1 (mm) or the amount Tb of the bulging is changed in the range which is corresponding to the thickness D2 (mm) of molten steel before the rolling reduction of the cast slab and satisfies a formula ( 0.2≤D1/D2≤0.7 ) and a formula ( D1≥5 mm). COPYRIGHT: (C)2004,JPO
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