Nippon Kokan Kabushiki Kaisha

Katsuhiko Tachibana

Kenzo Yamada

Eiichi Sakamoto

Akira Masui

Yoshihiro Kato

Katsuya Suzuki

Masanobu Kubo

Akinori Ninomiya

Takashi Yasui

In a steel making process with an oxygen top-blown converter when a certain inclining angle (.theta.) is given within a range of 0&lt;.theta..ltoreq.15.degree. to normal axis of an oxygen blow lance being supported at an upper portion of the lance and a certain number of rotation (.nu.) is given within the range of 0&lt;.nu..ltoreq.15 rpm to the lance, the blow of oxygen is possible to be properly used as the refining reactions are advanced without any delay of slagging reaction and any stagnation of non-slagging lime during blowing.

Steel making process by oxygen top-blown 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

Katsuhiko Tachibana