Immersion nozzle
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United States of America Patent
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-
Aug 20, 2002
Grant Date -
N/A
app pub date -
Mar 21, 2000
filing date -
Sep 22, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An immersion nozzle 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 the quality of cast pieces are further enhanced. 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.
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