Process for refining of chromium-containing molten steel

Details Process for refining of chromium-containing molten steel Process for refining of chromium-containing molten steel

C - Chemistry, Metallurgy

21

C

53/109

C21C 7/064 (2006.01) C21C 5/00 (2006.01) C21C 7/068 (2006.01)

Patent

CA 1230974

ABSTRACT OF THE DISCLOSURE The refining of chromium-containing molten steel by the treatments of decarburization, reduction, and desul- furization is improved in terms of consumption of argon gas used for blowing molten steel, amount of refractories of the AOD furnace, and CaO and CaF2, etc. by a process which com- prises adding to the slag existing after completion of the decarburization, metallic Al as a reducing agent and CaO as a slag-forming agent respectively in amounts necessary for the slag, after completion of the subsequent reduction, to acquire a SiO2 content of not more than 10% and a CaO/Al2O3 ratio in the range of 0.8 to 2.0 thereby enabling the treatments of reduction and desulfurization to proceed simultaneously.

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