Process for vacuum degassing and decarbonization with...

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

C - Chemistry, Metallurgy

21

C

53/108, 53/77

C21C 7/10 (2006.01)

Patent

CA 1337846

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 combusting CO gas in the vicinity of the surface of the molten metal at a timing, in which the concentration of (CO + CO2) in an exhaust gas is higher than or equal to 5% by volume and at a CO2/(CO + CO2) ratio in the exhaust gas is approximately 0.3. Heat generated by combustion of CO gas is utilized for compensating temperature drop of the molten steel.

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