Nippon Kokan Kabushiki Kaisha

Eiichi Sakamoto

Akichika Ozeki

Kiyomi Taguchi

Yoshio Miyashita

Katsuhiko Tachibana

Takashi Yasui

Shigeyuki Ono

Katsuya Suzuki

Masanobu Kubo

Steel making by a converter comprises blowing oxygen onto the surface of molten steel held in the converter and blowing agitating gases of 1/3 to 1/3000 of the amount of said oxygen thereinto from tuyeres provided at bottom of the converter, which number from 1 to 30 and are from 2 to 30 mm.phi. in inside diameter, thereby to effectively agitate the molten steel and make blowing reaction stabilized for purposes of increasing production and improving quality of the steel.

Steel making by converter

In the refining of steel by an oxygen topblown converter, the temperature and carbon content of molten steel are simultaneously measured by a sensor at a predetermined time before the end point, whereby in accordance with the difference between a calculated carbon content at the endpoint obtained by processing the measured values and a target carbon content at the end-point, the oxygen quantity to be blown in at the end-point and the coolant requirement or the pattern of soft-blow are computed to simultaneously control the temperature and carbon content of the molten steel at the end-point.

Method of simultaneously controlling temperature and carbon content of

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Kamakura, Japan

Eiichi Sakamoto