| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a gas cutting-off method for a continuously cast material capable of increasing cutting-off speed of gas cutting-off, and moreover, lessening the gouged amount of a cut surface. Ž<P>SOLUTION: The gas cutting-off machine uses a burner 20 which spouts combustion gas for forming a preheating flame and preheating oxygen and spouts oxygen for cutting for combusting and cutting a steel preheated by a preheating flame. The height from the burner 20 to the steel 16 is set at ≥100 to ≤30 mm. The pressure of the oxygen for cutting-off supplied to the burner 20 is regulated to ≥1.00 to ≤1.2 MPa in gauge pressure. The cutting-off speed of the steel 16 by the burner 20 is set at ≥500/min. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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