| 摘要 |
PROBLEM TO BE SOLVED: To prevent a surface crack of a casting piece in a pressurized zone for prolonging a roll life by always maintaining a surface temperature of the casting piece in a pressurized zone at almost even with alternating comparative water volume in the pressurized zone according to a width ratio of a pressurized slab. SOLUTION: A pressurizing zone is provided at a curvature part of a continuous casting machine. In a case that a comparative water volume of a pressurizing zone before pressurization is set as Q0 (l/min), a comparative water volume at a pressurizing time and after the pressurization is completed as Q (l/min), a casting piece width before the pressurization as y0 (mm) and, a casting piece width at the time of pressurization as y, cooling water volume is adjusted in a range Q=a×(y/y0)×Q0,α=0.6-1.0 from the start of pressurization. Thus, cooling of the pressurized casting piece can be performed without a need of large cooling water, and also surface crack of the casting piece can be reduced to substantially 0. Since cooling water volume can be thus lessened, a casting piece temperature is secured normally at 900 deg.C or above and a deformation resistance of the casting piece is reduced, resulting in a prolongation of the roll life.
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