Nippon Steel Corporation

Haruki Ariyoshi

Yasunobu Ikehara

Ryoichi Hidaka

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.

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Hikarishi, Japan

Haruki Ariyoshi