METHOD FOR CONTINUOUSLY CASTING SMALL CROSS SECTION ALUMINUM-KILLED STEEL CAST SLAB

摘要

PROBLEM TO BE SOLVED: To cast a small cross section aluminum-killed steel cast slab without deteriorating cleanliness of the cast slab while preventing clogging of a nozzle when the above cast slab to which no Ca adding treatment is performed is cast. SOLUTION: When the small cross section aluminum-killed steel cast slab 6 having <=0.1 m2 cross sectional area of the cast slab is continuously cast, the atmosphere in a tundish 3 is shut off from the outer air and the molten metal 1 being applied with Al-deoxidation and substantially containing no Ca is poured into the tundish. While dipping a tundish nozzle 7 where a cap nozzle 8 is disposed at the upper part, into the molten steel in a mold 4 covered with mold powder 5 and blowing inert gas in the range of 20-50 Nl/min per 1 m2 of the cross sectional area of the mold from the lower part of the cap nozzle, the molten steel in the tundish is cast into the mold.