公开(公告)号：US20220154299A1

公开(公告)日：2022-05-19

申请号：US17601481

申请日：2020-04-02

申请人： JFE STEEL CORPORATION

发明人： Yumi MURAKAMI ,  Nobuhiko ODA ,  Yusuke FUJII ,  Goro OKUYAMA ,  Shota AMANO ,  Shinji KOSEKI ,  Shingo SATO ,  Yukio TAKAHASHI ,  Ryo KAWABATA ,  Naoki KIKUCHI ,  Atsuo YUASA

IPC分类号： C21C5/46

摘要： 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.