METHOD FOR CONTINUOUSLY CASTING STEEL

PROBLEM TO BE SOLVED: To provide a method for continuously casting a steel where, when a partition hardware is installed in a mold, also, a tundish is exchanged, and molten steels of different components are subjected to consecutive continuous casting, the phenomenon that knot parts formed by temporarily stopping the pouring of the molten steels to the mold for installing a partition hardware and the exchange of the tundish are overcooled, is prevented. SOLUTION: The pouring of molten steels 14 to a mold 4 is temporarily stopped, and a partition hardware is installed in the mold, and consecutive continuous casting is performed, the pouring of the molten steels from a tundish to the mold is restarted, further, the drawing of a slab is restarted, thereafter, the positions of knot parts are successively grasped, regarding the respective cooling zones 8 to 13 in the secondary cooling zones 8 to 13, in a period for which the knot parts are passed through, a secondary cooling water quantity is controlled to a cooling water quantity (α×Q) obtained by multiplying a secondary cooling water quantity (Q) calculated from a slab drawing speed by a correction factor α(α