Kabushiki Kaisha Kobe Seiko Sho

Hideaki Fujimoto

Takao Harada

Hidetoshi Tanaka

Shuzo Ito

Hiroshi Sugitatsu

Tsuyoshi Mimura

Minoru Kitamura

Masahiko Ohgami

Shinji Koyama

Hideo Matsui

Tsuyoshi Yasui

Isamu Hirose

A blowing tuyere to be embedded in a bottom of side wall of a molten metal bath container for blowing a gas thereinto, the tuyere including a cylindrical core body fixedly located at the center of the tuyere and an outer tube fixed concentrically around the core body with a gap of a predetermined width to form an annular blowing passage therebetween.

Tuyere for blowing gases into molten metal bath container

A method for stably refining high carbon steel by top and bottom blown converter refining in which the entire quantity or part of refining pure oxygen is blown onto molten iron through a top blowing lance nozzle while blowing an inert gas into the converter through a nozzle at the bottom thereof, and wherein the bottom blown inert gas is fed at a rate less than 0.09 Nm.sup.3 /min.multidot.ton during the blowing and/or at a rate less than 0.03 Nm.sup.3 /min.multidot.ton in a controlling stage immediately after turndown.

Method for stably refining high carbon steel

Growing community of inventors

Akashi, Japan

Hideaki Fujimoto