Molten steel pouring nozzle
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Aug 8, 1989
Grant Date -
N/A
app pub date -
Dec 5, 1988
filing date -
Dec 21, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A molten steel pouring nozzle comprising an upper nozzle made of a refractory, an upper end portion of which is to be inserted into a bottom wall of a molten steel receiving vessel; a lower nozzle made of a refractory, having, on an upper end portion thereof, a recess for receiving a lower end portion of the upper nozzle; and an open air shutoff means for preventing an open air from penetrating through an interface between the lower end portion of the upper nozzle and the recess of the lower nozzle. The open air shutoff means comprises a steel shell covering the upper end portion of the lower nozzle and having on a side surface thereof an inert gas feed port; an annular equalizing chamber, provided between the upper end portion of the lower nozzle and the side surface of the steel shell, communicating with the inert gas feed port of the steel shell; and a plurality of grooves formed between the upper end surface of the lower nozzle and the upper surface of the steel shell, one end of each of the grooves communicating with the annular equalizing chamber, and the other end thereof communicating with the recess of the lower nozzle.
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