The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 05, 2024
Filed:
Mar. 31, 2020
Applicant:
Nippon Steel Corporation, Tokyo, JP;
Inventors:
Norifumi Asahara, Tokyo, JP;
Katsuhiko Kato, Tokyo, JP;
Mikio Futaka, Tokyo, JP;
Yasuhiro Tanaka, Tokyo, JP;
Naoki Kaneko, Tokyo, JP;
Junichi Nakagawa, Tokyo, JP;
Assignee:
NIPPON STEEL CORPORATION, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C21C 7/00 (2006.01); C21C 5/00 (2006.01); C21C 5/52 (2006.01); C21C 5/54 (2006.01); C22C 33/04 (2006.01);
U.S. Cl.
CPC ...
C21C 7/0006 (2013.01); C21C 5/005 (2013.01); C21C 5/527 (2013.01); C21C 5/54 (2013.01); C21C 7/0025 (2013.01); C22C 33/04 (2013.01); C21C 5/5217 (2013.01);
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.