公开(公告)号：US12134799B2

公开(公告)日：2024-11-05

申请号：US17603593

申请日：2020-03-31

Applicant: NIPPON STEEL CORPORATION

Inventor： Norifumi Asahara ,  Katsuhiko Kato ,  Mikio Futaka ,  Yasuhiro Tanaka ,  Naoki Kaneko ,  Junichi Nakagawa

IPC: C21C7/00 ,  C21C5/00 ,  C21C5/52 ,  C21C5/54 ,  C22C33/04

Abstract: A charged material containing a metal raw material of at least one of ferrochromium containing metal Si or ferrosilicon and unreduced slag containing Cr oxide generated by oxidation refining is charged into an AC electric furnace including three electrodes, a mass ratio of a metal Si amount to a Cr oxide amount being from 0.30 to 0.40, and a C concentration being from 2.0% by mass to a saturation concentration.