| 摘要 |
An immersion nozzle which dissolves problems involved in continuous casting of molten steel and is excellent in flow control of molten steel in a mold and durability, and which comprises a twisted tape-shaped part (1) for allowing a flow of molten steel to swirl in the nozzle.This part is applicable to both of straight pipe type and double port type immersion nozzles,and a double port type immersion nozzle (12) is constructed to be bottomless to eliminate a problem associated with inclusions that may attached to bottom surface.Further, in the immersion nozzle, an inner wall surface of a discharge port is shaped to be arcuately divergent in longitudinal cross section, whereby effects of improving a quality of cast pieces are further enhanced. In addition, when the immersion nozzle additionally includes a construction (15) for blowing a gas into a flow of molten steel which is made by the twisted tape-shaped part to swirl, effects of catching, carrying and floating inclusions are further enhanced. <IMAGE> |
