| 摘要 |
PURPOSE:To obtain a cast slab without center porosity and inner cracking by specifying the ratio of rolling reduction rate/non-solidified thickness, the solidus ratio of the center part in cast slab and the strain of rolling reduction at the time of the rolling reduction to the continuously cast slab drawn from a mold. CONSTITUTION:The continuously cast slab drawn from the mold is reduced by rolls. Then, the rolling reduction of cast slab is executed under condition of 0.5-1.0 the ratio R/L of the rolling reduction rate R and the non-solidified thickness L at the time of the rolling reduction, 0.5-0.8 the solidus ratio of the center part in cast slab and <=0.2% the strain of rolling reduction. In this way, the cast slab without any center porosity and inner cracking is obtd.
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