| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous-casting method capable of preventing the deterioration of quality at the boundary part of a sequence casting. SOLUTION: In the continuous-casting method, a cast-slab containing non-solidified part is rolling-reduced by using rolling-reduction pair set in the continuous-casting machine or the end part of the machine. When the sequence casting is performed, the molten steel weight in a tundish at the interval from the supplying stop of first charging of molten steel to the supplying start of after charging of molten steel secures≥2/3 of the molten steel weight when the continuous-casting in the steady state is performed, and the lowering of the over-heat degree of the molten steel in the tundish, is restrained within≤10°C at this timing. Further, the molten steel casting speed at the interval from the supplying stop of the first charging of molten steel to the supplying start of the after charging of molten steel secures the same casting speed as the casting speed in the steady state, and the rolling-reduction rate when the unsolidified part in the cast slab, in which the molten steel corresponding to the molten steel exists in the tundish, is cast at the interval from after supplying stop of the first charging of molten steel to the supplying start of the after charging of molten steel is made to target rolling-reduction rate or higher necessary to the discharge of non-solidified concentrating molten steel. COPYRIGHT: (C)2011,JPO&INPIT
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