Search International and National Patent Collections

1. (WO2018021019) MOLTEN STEEL PRODUCTION METHOD

Pub. No.:    WO/2018/021019    International Application No.:    PCT/JP2017/025296
Publication Date: Fri Feb 02 00:59:59 CET 2018 International Filing Date: Wed Jul 12 01:59:59 CEST 2017
IPC: C21C 5/28
Applicants: NIPPON STEEL & SUMITOMO METAL CORPORATION
新日鐵住金株式会社
Inventors: SUZUKI, Teppei
鈴木 哲平
TASHIRO, Toru
田代 亘
Title: MOLTEN STEEL PRODUCTION METHOD
Abstract:
In the present invention, slag that is obtained by solidifying slag generated in previous decarburization blowing is introduced into a decarburization furnace for the present charge while a part of the slag generated from the previous charge is left in the decarburization furnace. Subsequently, a hot metal with a phosphorus concentration of less than 0.060% by mass is loaded into the decarburization furnace, and decarburization blowing is performed. When the concentration of P2O5 in the slag generated by decarburization blowing of the present charge is not more than a predetermined value, a part thereof is left in the decarburization furnace as slag for use in the next charge.