| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method of a thin cast slab, with which the warping deformation thereof after executing rolling reduction is prevented and the drawing-out working thereof is facilitated and the temp. thereof kept high. SOLUTION: In the continuous casting method of a steel reducing the thickness by using at least one pair of rolling reduction rolls to execute the rolling reduction on the way of the ordinary casting, the rolling reduction is executed at the position of the cast slab containing unsolidified part, and a water ratio Q (l/kg of steel) of secondary cooling water for cooling the cast slab after completing the rolling reduction, is regulated to the quantity satisfying Q <=0.6×(y/y1)×Q1. Wherein, Q1 is the water ratio (l/kg of steel) of the secondary cooling water in the case of executing no rolling reduction under containing of the unsolidified state at the downstream side of the casting direction from the rolling reduction roll pair, (y) is the target thickness (mm) of the cast slab after executing the rolling reduction and (y1) is the thickness (mm) of the cast slab before starting the rolling reduction.
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