| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method where, even in the rolling reduction for the unsolidified part in a slab by simple rolling-reduction equipment, a sufficient rolling draft can be imparted, thus the internal cracks of the slab can be suppressed, and further, central segregation can be reduced. SOLUTION: Regarding the continuous casting method for a metal, when, using rolling reduction rolls as a pair in the upper and lower sides arranged in a continuous casting machine or at the machine edge part, a slab including an unsolidified part is subjected to rolling reduction, the lower roll in the rolling reduction rolls as a pair is projected to the upper part than the lower side pass line in the slab, and rolling reduction is performed. In this case, on the upstream side than the rolling reduction position, the unsolidified part in the slab is not bulged, or, in the central part in the lateral direction of the slab, it is bulged within the range of≤5 mm in the thickness direction, the projecting amount of the lower roll to the upper part than the lower side pass line in the slab is controlled to≥30% of the objective total draft, and, in a state where the rolling reduction is progressed by≥80% of the objective total draft, the upper solidified shell and the lower solidified shell on the long side in the slab are stuck by pressure. COPYRIGHT: (C)2008,JPO&INPIT
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