SEQUENTIALLY CONTINUOUS CASTING METHOD FOR SEQUENTIALLY CASTING DIFFERENT KINDS OF MOLTEN STEELS

PROBLEM TO BE SOLVED: To provide a method for setting the suitable component target value in a refining process of molten steel, in order that the weight of off-specification product in a cast slab cast from molten steel component mixed range in a preceding ladle and a succeeding ladle is reduced as much as possible, when a sequentially continuous casting, etc., of the different kinds of steels during continuous casting is executed. SOLUTION: In the sequentially continuous casting method continuing the continuous casting by supplying the molten steel from the succeeding ladle into a tundish after completing the supplying of the molten steel from the preceding ladle into the tundish during continuous casting, in the case the difference between the molten steel specification component values in the preceding ladle and the succeeding ladle exists and also, the overlap part between the molten steel specification component values in the preceding ladle and the succeeding ladle is not contained, the molten steel target component values in the preceding ladle and/or in the succeeding ladle are adjusted in the range of each specification component value in the refining process of the molten steel and the different kinds of steels of the continuously cast molten steel is sequentially cast.