C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
39/104, 53/93
C22B 9/05 (2006.01) C21C 7/00 (2006.01) C21C 7/10 (2006.01) C22B 9/10 (2006.01)
Patent
CA 1238788
SO2-39616M/AO/85 ABSTRACT A controlled melt refining method is provided that ensures rapid and consistent refining by controlling the gas holdup (.DELTA.H/H), as an index for the intensity of boiling, at a predetermined value in the range of 0.1-0.5. The method comprises (a) covering the surface of a semi-killed molten steel in a ladle with a basic slag which either is non-oxidizing or contains not more than 5% of FeO; (b) maintaining the pressure of the atmosphere above the melt in the range of 30-150 Torr; (c) blowing an inert gas into the ladle from the bottom; and (d) maintaining the height of the boiling melt in terms of gas hold- up (.DELTA.H/H) within the range of 001-0.5 by controlling the pressure at which the inert gas is blown and/or by adjusting a vacuum exhaust valve, .DELTA.H being the difference in height between the surface of the boiling melt and a quiet melt, and H being the height of the quite melt. The present invention also comprises an apparatus for refining molten steel in accordance with the above method.
490811
Riches Mckenzie & Herbert Llp
Sumitomo Electric Industries Ltd.
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