| 摘要 |
PROBLEM TO BE SOLVED: To prevent the internal crack and the breakout caused by the internal crack when a round billet is continuously cast. SOLUTION: This cooling method is applied at just below a mold when the round billet is continuously cast from molten steel having 0.3-1.0 wt.% carbon content. In the case D (mm) is thickness of a solidified shell 3a just below the mold 1 andΔT( deg.C) is return-back heat quantity during the interval from just below the mold 1 to a mold spraying 2, based on the setting position of the preset mold spray 2, at least one of the cooling water quantity of the mold spray 2 and the casting speed is controlled so thatΔT/D( deg.C/min) becomes <=8.5. In this way, the round billet having sound interval quality without the internal crack, can be produced.
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