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US 6,435,385 B1Granted
Immersion nozzle
OwnerKatsukiyo Marukawa, Shigeta Hara +1inventors
InventorsKatsukiyo Marukawa, Shigeta Hara, Shinichiro Yokoya
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OwnerKatsukiyo Marukawa, Shigeta Hara +1inventors
InventorsKatsukiyo Marukawa, Shigeta Hara, Shinichiro Yokoya
Estimating the term…
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.
An immersion nozzle having an element for providing swirling to molten steel flow in the immersion nozzle, wherein the element consists of a single twisted-tape having a width D nearly equal to an inner diameter of the nozzle and said twisted-tape divides said molten steel flow into two parts at an inner diameter portion of the immersion nozzle.
An immersion nozzle having an element for providing swirling to molten steel flow in the immersion nozzle, wherein an outlet in the immersion nozzle has a structure without a bottom with two hollowed portions in a direction to a diameter of the immersion nozzle.
Dependencies are inferred from the claim text.