Metal founding – Process – Shaping liquid metal against a forming surface
Reexamination Certificate
2007-10-02
2007-10-02
Kerns, Kevin P. (Department: 1725)
Metal founding
Process
Shaping liquid metal against a forming surface
C164S437000, C222S591000, C222S606000
Reexamination Certificate
active
10569006
ABSTRACT:
A nozzle for continuous casting of clean steel is capable of preventing adhesion of Al2O3-based inclusions to a wall surface of the inner hole of the nozzle while fully achieving an effect of a swirl vane. The swirl vane prevents drift in molten steel passing through the inner hole. The swirl vane is disposed in the inner hole. A wall surface is at least partly formed as a tubular-shaped refractory layer and is prepared by controlling a weight ratio of CaO/MgO and an apparent porosity to have a thickness of 3 to 20 mm, so as to prevent adhesion of Al2O3-based inclusions to the wall surface and the swirl vane while effectively maintaining the anti-drift effect for long hours. Further, inert gas is injected into a molten steel flow between an upper nozzle and the swirl vane to facilitate surfacing of Al2O3-based inclusions in a mold and reduce Al2O3-based inclusions in molten steel so as to achieve stable casting operation and high-quality steel with high cleanness.
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Asano Keisuke
Morikawa Katsumi
Uchida Saeko
Yoshitomi Joki
Bianco Paul D.
Fleit Martin
Fleit Kain Gibbons Gutman Bongini & Bianco P.L.
Kerns Kevin P.
Krosakiharima Corporation
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