| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for avoiding the surface defect, particularly, occurrence of web cracking, in a continuous casting of a beam blank disposing one immersion nozzle at one side of flange parts in a mold. SOLUTION: When a beam blank is continuously cast by using a bend type beam blank continuous caster, and pouring molten steel through one immersion nozzle disposed at the center part of either one side of the flange parts in the mold, into the mold of an H-shaped cross sectional plane having the flange parts at both sides of the web part, the casting is performed so that the horizontal inclining angle from the center line of the cross sectional plane in the web part to the outside of the bend in the spouting direction of the molten steel stream spouted toward the other side of the mold from a side directional hole of the immersion nozzle, is made to be >2 deg. and becomes smaller than the angle in the tangential direction to the joining part between the web part and the flange part.
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