C - Chemistry – Metallurgy – 21 – C
Patent
C - Chemistry, Metallurgy
21
C
53/77
C21C 7/10 (2006.01) C21C 1/00 (2006.01) C21C 7/072 (2006.01) C22B 9/05 (2006.01)
Patent
CA 1338397
A method for refining molten steel in a vacuum comprises an immersion process, wherein two immersion nozzles arranged at the lower portion of a vacuum vessel are immersed in molten steel in a ladle; a dissolving process, wherein gases are dissolved in molten steel by blowing gases containing at least gas soluble in the molten steel from a gas blow-in opening arranged in a ladle in the molten steel; a first degassing process, wherein the molten steel is degassed by keeping the the vacuum vessel evacuated, having the molten steel circulated between the ladle and the vacuum vessel by injecting gases containing at least an inert gas from the middle of the rising tube and blowing gases containing at least gas soluble in the molen steel from a gas blow-in opening arranged in the ladle;and a second degassing process, wherein the molten steel is degassed by keeping the vacuum vessel evacuated, stopping a gas blow-in from the gas blow-in opening arranged in the ladle and having the molten steel circulated between the ladle and the vacuum vessel by injecting gases containing at least an inert gas from the middle of the rising tube in the molten steel.
588802
Fukuda Shuzo
Ishii Toshio
Kawai Yoshihiko
Okubo Yutaka
Nkk Corporation
Ridout & Maybee Llp
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