Nippon Steel Corporation

Shin-ichi Sanuki

Toru Yoshida

Yuziro Ueda

Kosaburo Ikenouchi

Takeshi Shoji

Tomoaki Kume

Toshiharu Mitsuo

The present invention provides an improved process for desulfurization of molten pig iron by a first step of adding powdered aluminum to the molten pig iron and a second step of adding CaO to the molten pig iron, the improvement comprising adding the aluminum as a powdery mixture with CaO, alumina or both, whereby splashing associated with the addition of aluminum alone is reduced.

Process for desulfurizing molten pig iron

A method of controlling the temperature of molten steel and the carbon content in an oxygen converter comprising the steps of, making measurements by the use of a detecting probe at the suitable time in the midst of the blowing; measuring the actual value at that time as the starting point for the thereafter operation of prediction; using the amount of slag accumulated oxygen as a principal parameter for operation of the prediction, and combining the third feature stated above with the second feature stated above for obtaining the predicted value with higher accuracy.

Method of controlling molten steel temperature and carbon content in

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Kishiwada, Japan

Shin-ichi Sanuki