| 摘要 |
PROBLEM TO BE SOLVED: To prevent the generation of breakout even under condition of raising such problem as the breakout and also, to improve the surface cracking and the surface layer cleanliness of a cast slab. SOLUTION: A negative stripping time in a mold oscillation is regulated to <=0.25 sec to reduce the depth of oscillation mark causing to the surface cracking of the cast slab and the inclusion/blow hole under the surface shell to <=0.5 mm. Further, in the case of the increasing of the casting speed a the starting of the casting, when the increasing ratio of the casting speed is >=1.0 m/min2 and the casting speed is >=3.0 m/min under condition of mostly raising such problem as the breakout, liquid lubricator, such as rapeseed oil, in addition to mold powder is supplied to supplement the shortage of the lubricator.
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