| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method where a cast piece including an unsolidified part is subjected to rolling reduction after bulging, and central segregation is uniformly reduced over the whole in the width direction of the cast piece, and to provide the cast piece. SOLUTION: In the continuous casting method, a cast piece is subjected to bulging, and the cast piece including an unsolidified part at the inside is subjected to rolling reduction by at least a pair of rolling reduction rolls. The rolling reduction is started at a position in which the central solid phase ratio in the cast piece is≤0.2, and is performed at a draft satisfying the inequality (1) of D<SB>3</SB>≤D<SB>1</SB>; wherein, D<SB>3</SB>is the average liquid phase thickness (mm) of the unsolidified part in the position at which the rolling reduction is started in the cast piece defined by the following formula (2); and D<SB>1</SB>is the draft (mm) of the cast piece. The formula (2) is D<SB>3</SB>=[(1.2-fs)/2]×D<SB>2</SB>; wherein, D<SB>2</SB>is the thickness (mm) of the unsolidified part in the cast piece at the position where the rolling reduction is started in the cast piece; and fs is the central solid phase ratio of the cast piece in the position at which the rolling reduction is started in the cast piece. COPYRIGHT: (C)2005,JPO&NCIPI
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