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

1984-09-24

1985-12-24

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 53, 75 58, C21C 702

Patent

active

045604061

ABSTRACT:
The refining of chromium-containing molten steel by the treatments of decarburization, reduction, and desulfurization is improved in terms of consumption of argon gas used for blowing molten steel, amount of refractories of an AOD furnace, and CaO and CaF.sub.2, etc. by a process which comprises 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 SiO.sub.2 content of not more than 10% and a CaO/Al.sub.2 O.sub.3 ratio in the range of 0.8 to 2.0, thereby enabling the treatments of reduction and desulfurization to proceed simultaneously.

REFERENCES:
patent: 2980529 (1961-04-01), Knapp
patent: 3702243 (1972-11-01), Miltenberger
patent: 4374664 (1983-02-01), Mitsuo

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