PURPOSE: To prevent the V-shaped dense segregation and negative segregation of an ingot and to make mechanical properties homogeneous by limiting the mounting positions of electromagnetic stirrers, and the product of the magnetic flux density at the interface between an unsolidified part and a solidified part and stirring time.
CONSTITUTION: One a number of pieces of electromagnetic stirrers 2 are provided below a casting mold 1, in the positions nearer the drawing direction side than the drawing position where the unsolidified thickness with respect to the thickness of the ingot in the thickness direction thereof is 45%. Molten steel is stirred in the casting direction in such a way that the product of the magnetic flux density at the interface between an unsolidified part and a solidified part and stirring time attains ≥1,600 gauss min/m3 with respect to the volume of the entire unsolidified molten steel existing in the drawing direction side from the positions where the electromagnetic stirrers exist.
YOSHII KENTA
KAWASAKI SHIYOUZOU
MATSUO KATSUYOSHI
TOMONAGA MITSUO
