CONTINUOUS CASTING METHOD OF STEEL

PROBLEM TO BE SOLVED: To provide the continuous casting method of steel, with which, when molten steel 6 is continuously cast using a continuous casting machine 1 provided with a light rolling reduction zone composed of two or more pairs of rolls 4A, 4B for applying rolling reduction force to a slab 7, and when a boundary between a dummy bar head 15 and the bottommost slab 7A passes through the slight rolling reduction zone 11, variation in the molten metal surface 10 of the molten steel in a mold 3 and bulging of the slab 7 in the vicinity of the boundary caused by the discharging resistance owing to the narrowing in the intervals of the rolls can be jointly prevented. SOLUTION: When the outflow of hydraulic oil from a hydraulic cylinder 16 for applying rolling reduction force to the slab 7 by the rolls 4A, 4B reaches a fixed value or above, rolling reduction force is applied to the slab 7 by the rolls 4A, 4B. COPYRIGHT: (C)2009,JPO&INPIT