| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems encountered in the conventional light drafting method. SOLUTION: In the continuously casting steel, from the position when the central section solidus rate of a casting slab 5b becomes 0 to 0.2, to a complete coagulation in the W type crater end, the roll cavity drawing quantity is increased by 0.1 to 0.5 mm/m, and the surface temperature recuperative quantity of the casting slab in the boundary section of the secondary cooling zone is set at 30 deg.C or less and simultaneously, the secondary cooling is continued until the casting slab 5b is completely coagulated. As a result, the light drafting method effectively obtains a continuously casting slab whose central segregation is low-graded.
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