| 摘要 |
PURPOSE:To produce a continuously cast slab having only little development of cavity or porosity by eliminating center segregation, by executing plastic deformation to the cast slab at cooling process of the cast slab continuously cast under pressing reduction by pressing device. CONSTITUTION:The cast slab 4 drawn from a mold 3 in the continuous casting apparatus is cooled by injecting cooling water, to make progress of solidification of the liquid phase 4a at center part of the cast slab 4. The pressing device 20 of hydraulic type, etc., is arranged between straightening rolls 8 and guide rolls 6 or 7 in a strand, where the solidification of the liquid phase 4a at center part of the cast slab 4 is not completed, and the pressing reduction is applied to upper/lower direction of the cast slab 4. By this pressing reduction, the center segregation of carbon in the cast slab 4 substantially becomes zero and cavity is crushed. A pressing device 30 is arranged between the straightening rolls 8 and cutting machine 10 together with the above pressing device 20 or instead of the pressing device 20 and by applying the pressing reduction to the cast slab 4, the development of cavity and porosity is extremely reduced.
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