| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for subjecting a slab of high internal quality having reduced center segregation and center porosities to soft reduction continuous casting only by the addition of a simple apparatus. SOLUTION: In the continuous casting method with soft reduction for steel in which drawing with soft reduction is performed in such a manner that the opening degree of rolls in the middle period of solidification is made wider as it goes to the downstream side to introduce thickness expansion of a slab, and next, the opening degree of rolls in the last stage of the solidification is made narrower as it goes to the downstream side, the thickness of the slab after the soft reduction is measured at least in two parts of the edge part in the width direction of the slab and the part other than the edge part, a soft reduction evaluation value (ΔR) is obtained from the thickness Te of the slab at the edge part in the width direction and the thickness Tc of the slab other than the edge part in the width direction, and the opening degree S<SB>0</SB>of the rolls, the opening degree S<SB>1</SB>and S<SB>2</SB>of the rolls at the initial stage of the solidification, and on the basis of the soft reduction evaluation value (ΔR), the control of the opening degree of rolls is performed. COPYRIGHT: (C)2011,JPO&INPIT
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