Nippon Steel Corporation

Mishima Kosan Co., Ltd.

Kurosaki Yogyo Co., Ltd.

Yasunobu Ikehara

Ryoichi Hidaka

Hidemaro Takeuchi

Shogo Matsumura

Tsuyoshi Saeki

Kazumichi Honda

Takashi Yanai

Terumoto Matsuo

Haruki Ariyoshi

Tadao Uryu

Fusakazu Kotzumi

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.

Continuous casting of steel slabs and blooms free from surface defects

A method of regulating the flow of molten metal through the pour opening of a vessel is disclosed which is characterized by a combination of a pair of load detecting elements and a contactor which is disposed between the load detecting elements such that there is effected control of a hydraulic cylinder for actuating a sliding control nozzle which is capable of moving bit-by-bit resulting in the fine regulation of the sliding control nozzle.

Method of regulating the flow of molten metal through the pouring

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Yamaguchi, Japan

Yasunobu Ikehara