CONTINUOUS CASTING METHOD FOR STEEL

摘要

PURPOSE:To obtain an ingot which has substantially no oscillation marks and has low sensitivity to hot cracking by using a casting mold which is specified in the length from the meniscus part of the molten steel in the mold down to the bottom end of the mold, cooling slowly the molten steel near the meniscus and oscillating ultrasonically the mold. CONSTITUTION:The casting mold 3 which is open at both ends and of which the length Lmm from the meniscus 2 part of the molten steel 1 in the mold 3 down to the bottom end of the mold satisfies the conditions determined by the equation is used. The molten steel 1 near the meniscus 2 in the mold is slowly cooled by using such mold 3. The mold is at the same time oscillated ultrasonically by ultrasonic oscillators 5, 5'. The surface flaw of the ingot is surely suppressed by the above-mentioned continuous casting method.