Process for vacuum degassing and decarbonization with temperatur

Details Process for vacuum degassing and decarbonization with temperatur Process for vacuum degassing and decarbonization with temperatur

1989-06-21

1990-12-25

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Producing or treating free metal

75512, C21C 710

Patent

active

049799835

ABSTRACT:
A process of degassing and decarbonizing is directed to a process for performing vacuum degassing non-deoxidized or slightly deoxidized molten steel utilizing RH process or DH process. The process includes blowing of oxygen or oxygen containing gas toward the surface of the molten steel in a vacuum chamber for promoting decarbonizing reaction. The process further includes a step of combustioning of CO gas in the vicinity of the surface of the molten metal at a timing, in which concentration of (CO+CO.sub.2) in an exhaust gas is higher than or equal to 5% and a ratio of CO.sub.2 versus (CO+CO.sub.2) in the exhaust gas is approximately 30%. Heat generated by combustioning of CO gas is utilized for compensating temperature drop of the molten steel.

REFERENCES:
patent: 3497196 (1975-02-01), Ruttiger
patent: 4160664 (1979-07-01), Maruhashi
patent: 4615511 (1986-10-01), Sherwood
Patent Abstracts of Japan, vol. 4, No. 98(C-18)[580], Jul. 15, 1980, p. 163 C 18; & JP-A-55 062 118 (Kawasaki Seitetsu K.K.), 10-05-1980.
Patent Abstracts of Japan, vol. 8, No. 168, (C-236)[1605], Aug. 3, 1984; & JP-A-59 067 310 (Shin Nippon Seitetsu K.K.), 17-04-1984, (CatA).
Patent Abstracts of Japan, vol. 4, No. 186, (C-36)[668], Dec. 20, 1980; & JP-A-55 125 220, (Sumitomo Kinzoku Kogyo K.K.), 26-09-1980, (Cat. A).

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