CONTINUOUS CASTING METHOD FOR ALUMINUM-KILLED STEEL

PROBLEM TO BE SOLVED: To provide a continuous casting method for aluminum-killed steel under the high speed casting condition where the amount of the molten steel to be poured per minute is ≥4 ton, by which the clogging of an immersion nozzle caused by Al2O3in the molten steel is prevented, and consecutive continuous casting is performed. SOLUTION: At the time when aluminum-killed molten steel 17 in a tundish is poured into a die 2 using a molten steel pouring means installed in the bottom part of a tundish 1, and composed of an upper nozzle 3 with a gas blowing part 3, a sliding nozzle 4 connected to the upper nozzle, and an immersion nozzle 9 connected to the sliding nozzle, the average pore size of porous brick composing the gas blowing part is controlled to 30 to 50 μm, and further, the aluminum-killed molten steel of ≥4.0 ton per minute is poured into the die while gaseous Ar is blown therein from the gas blowing part in such a manner that the amount of the gaseous Ar to be blown reaches ≥2.0 NL per ton of the amount of the molten steel to be poured. COPYRIGHT: (C)2006,JPO&NCIPI