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:
Feb. 08, 2022
Filed:
Nov. 30, 2017
Applicant:
Jfe Steel Corporation, Chiyoda-ku Tokyo, JP;
Inventors:
Naoya Ihara, Tokyo, JP;
Masayuki Kasai, Tokyo, JP;
Takashi Iwamoto, Tokyo, JP;
Kimihiro Nishimura, Tokyo, JP;
Assignee:
JFE STEEL CORPORATION, Chiyoda-ku Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23C 8/32 (2006.01); C21D 1/06 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/08 (2006.01); C22C 38/10 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/32 (2006.01); C22C 38/60 (2006.01);
U.S. Cl.
CPC ...
C23C 8/32 (2013.01); C21D 1/06 (2013.01); C22C 38/001 (2013.01); C22C 38/008 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/10 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/32 (2013.01); C22C 38/60 (2013.01); C21D 2211/001 (2013.01); C21D 2211/004 (2013.01);
Abstract
Provided is a steel for nitrocarburizing that can ensure hardened case depth by suppressing precipitation of Cr, V, and Nb in a part of the surface layer very close to the surface. The provided steel comprises: a specific chemical composition satisfying 9.5≤([Cr]/52+[V]/50.9+[Nb]/92.9+M)×10≤18.5, with the balance being Fe and inevitable impurities; and a steel microstructure in which an area ratio of bainite phase with respect to the entire microstructure is more than 50%.