| 摘要 |
PURPOSE: To produce a large cross sectional cast bloom without causing bulging and cracking by specifying the relation between casting velocity and the length of long wall side and specifying the spraying rate of cooling water. CONSTITUTION: The rectangular large area cast bloom is produced by using a vertical type continuous casting apparatus and drawing out while cooling with cooling water from the lower part of a mold. In this case, when Vmm/min is denoted for the casting velocity and Lmm for the length of the long wall side in the cross section of the cast bloom, the relation of VL<=15×10<4> mm<2> /min is satisfied. Further, the spraying rate of cooling water in the range from just below the mold to [16V-the length in the vertical direction of the cast bloom (mm)] is made to be 1-100cm<3> /cm<2> .min and after this position, the spraying rate of cooling water is made to be below the above spraying rate and <=5 cm<3> /cm<2> .min to execute the operation. In this way, the large area cast bloom without causing bulging and cracking can be produced with simplified equipment construction.
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