Jfe Steel Corporation

Atsuo Yuasa

Yusuke Vincent Fujii

Yukio Takahashi

Naoki Kikuchi

Shingo Sato

Shota Amano

Nobuhiko Oda

Shinji Koseki

Ryo Kawabata

Goro Okuyama

Yumi Murakami

A top-blowing lance nozzle is configured to freely switch an adequate expansion condition so as to control an oxygen-blowing amount and a jetting velocity independently of each other without requiring a plurality of lance nozzles or a mechanically movable part. A lance nozzle is configured to blow refining oxygen to molten iron charged in a reaction vessel while a gas is blown from a top-blowing lance to the molten iron. One or more blowing holes for blowing a working gas are on an inner wall side surface of the nozzle, at a site where the lance nozzle has a minimum cross-sectional area in a nozzle axis direction or at a neighboring site of the site.

Lance nozzle

Growing community of inventors

Tokyo, Japan

Atsuo Yuasa