| 摘要 |
PURPOSE:To prevent segregation of impurities in a cast slab by executing the rolling reduction to the cast slab at the range of temp. in the center part of cast slab, corresponding to the temp. from the specific solidus ratio to the fluidized limit solidus ratio by the specific rolling reduction rate and avoiding the rolling reduction to the cast slab at the range of temp. from the fluidized limit solidus ratio to the solidus line temp. CONSTITUTION:The cast slab is positively to execute the rolling reduction at the range of temp. in the center part thereof, that is, at the time of reaching to temp. corresponding to the temp. from 0.1-0.3 solidus ratio to the fluidized limit solidus ratio. In the temp. range, the cast slab is continuously reduced as rolling at the ratio of >=0.5mm/min and <2.5mm/min. In the temp. range at the time of becoming to the temp. corresponding to the temp. from the fluidized limit solidus ratio to the solid phase, shifting of the molten steel caused by shrinkage after solidifying does not occurred and so the rolling reduction is not executed. In this way, the segregation of impurities in the cast slab produced by the continuous casting is prevented and the homogenous steel is obtd.
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