| 摘要 |
PURPOSE:To continuously produce a steel plate having a smooth casting surface without development of non-solidified defects by controlling roll peripheral velocity more than critical velocity for developing flow mark and less than critical peripheral velocity for non-solidification. CONSTITUTION:Twin roll type continuous casting apparatus arranges a tundish 3 storing temporarily molten metal, a molten metal pouring nozzle 4 arranged in the tundish 3 and one pair of rolls 1, 2 carried out as forming to platelike while solidifying the molten metal poured from a nozzle 4. In this case, by measuring the rolling reduction force, the roll peripheral velocity is maintained in the range of value, so that the rolling reduction force becomes to more than the prescribed value, and is controlled to less than the critical peripheral velocity for non-solidification. Further, the roll peripheral velocity is controlled to more than the critical velocity for developing flow mark, to cast. In this way, the steel plate having smoothly casting surface without the development of non- solidified defect, is produced.
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