Nippon Steel Corporation

Ryoichi Hidaka

Yasunobu Ikehara

Shogo Matsumura

Hidemaro Takeuchi

Tsuyoshi Saeki

Haruki Ariyoshi

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.

Process for refining of chromium-containing molten steel

Process for continuous casting of a steel slab free from surface defects, which comprises oscillating a mold under an oscillation condition which restricts the deformation of a meniscus portion of a strand shell so as to prevent oscillation defects.

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Yamaguchi, Japan

Ryoichi Hidaka