Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1985-09-18
1986-08-05
Rosenberg, Peter D.
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
C21C 552
Patent
active
046041370
ABSTRACT:
A controlled melt refining method is provided that ensures rapid and consistent refining by controlling the gas hold-up (.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 0.1-0.5 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 quiet melt. The present invention also comprises an apparatus for refining molten steel in accordance with the above method.
REFERENCES:
patent: 3574603 (1971-04-01), Rassenfoss
patent: 3980469 (1976-09-01), Forster
patent: 4036635 (1977-07-01), Klapdar
patent: 4200452 (1980-04-01), Savov
Rosenberg Peter D.
Sumitomo Electric Industries Ltd.
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