| 摘要 |
PROBLEM TO BE SOLVED: To provide a continuous casting method of steel capable of obtaining a cast slab developing no macro-segregation. SOLUTION: When the cast slab 7 having a rectangular cross sectional shape is cast, the casting is performed while giving vibration to the cast slab by continuously hitting the short side surface 9 of the cast slab containing unsolidified part 6 with a hit-vibrating device 10 disposed at least in one position at the short side surface 9 side of the cast slab containing the unsolidified part 6. It is desirable to apply rolling-reduction to the cast slab at the ratio corresponding to 0.5 mm-2.5 mm per 1 m in the casting direction by using plural guide roll pairs 4a, at a position containing the unsolidified part having 0.2-0.95 center solid-phase ratio at the downstream side from the position firstly hitting the short side surface of the cast slab. Further, it is desirable to apply the rolling-reduction to the bulged cast slab with at least one rolling-reduction roll pair 12 under suitable rolling-reduction ratio at the interval till completing the solidification in the center part of the thickness at the downstream side from the position firstly hitting the short side surface of the cast slab.
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