| 摘要 |
PROBLEM TO BE SOLVED: To establish a continuous casting method of a steel, with which the abnormality of quality caused by cleaning of a bottom cast slab can be prevented from occurring. SOLUTION: In the continuous casting method of the steel in which pouring into a mold 11 is started after storing the molten steel 12 in a tundish 1, the pickup rate of total oxygen concn. in the cast slab at the time of starting the casting and the separating ratio of oxide base inclusion, are pre-measured in the casting condition decided with the combination of three casting factors of whether or not molten steel in the tundish is heated, whether or not molten steel in the tundish is stirred and the molten steel stuck quantity in the tundish. Based on these measured results, the total oxygen concn. in the cast slab at the time of starting the casting and the separating ratio of the oxide base inclusion in the individual casting condition, are estimated and based on these estimated values, the surface cleaning method on the cast slab and the operating method at the time of starting the casting are decided for each product.
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