IMMERSION NOZZLE FOR CONTINUOUS CASTING AND CONTINUOUS CASTING METHOD USING THE IMMERSION NOZZLE

摘要

Immersion nozzles for continuous casting enabling an improvement in the quality of a casting piece surface layer part and an increase in the efficiency of casting by suppressing the self-excited oscillation of a fluid in a mold without using a complicated mechanism such as a swirl flow imparting immersion nozzle. A first immersion nozzle for continuous casting is characterized by comprising a cylindrical body and a pair of discharge holes formed, oppositely to each other, in the side walls near the bottom part of the cylinder body and in that one ridge-shaped projection extending parallel with the discharge direction projected on the cross section of the nozzle is formed on the inner surface of the bottom part and the bottom part is formed in a waterfall basin-like recessed shape having the maximum depth of 5 to 50 mm. A second immersion nozzle for continuous casting is characterized by comprising a cylindrical body and a pair of discharge holes formed, oppositely to each other, in the side walls near the bottom part of the cylindrical body and in that the cross sectional areas of the discharge holes vertical to the discharge direction projected on the cross section or longitudinal section of the nozzle are decreased toward the outlet thereof.