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:
Jul. 23, 2019
Filed:
Jul. 29, 2015
Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;
Jtekt Corporation, Osaka, JP;
Yutaka Neishi, Muroran, JP;
Takahisa Suzuki, Muroran, JP;
Tatsuya Koyama, Nishio, JP;
Shingo Yamasaki, Kimitsu, JP;
Kohei Kanetani, Kashiwara, JP;
Takashi Sada, Kashiwara, JP;
NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;
JTEKT CORPORATION, Osaka, JP;
Abstract
Provided is a carbonitrided bearing part which has high hardenability and toughness, and is excellent in wear resistance and surface-originated flaking life. A carbonitrided bearing part of the present embodiment has a chemical composition containing, in mass %, C: 0.15 to 0.45%, Si: not more than 0.50%, Mn: 0.40 to 1.50%, P: not more than 0.015%, S: not more than 0.005%, Cr: 0.30 to 2.0%, Mo: 0.10 to 0.35%, V: 0.20 to 0.40%, Al: 0.005 to 0.10%, N: not more than 0.030%, and O: not more than 0.0015%, with the balance being Fe and impurities, and satisfying Formulae (1) and (2). At surface, C concentration is 0.7 to 1.2%, N concentration is 0.15 to 0.6%, and Rockwell hardness HRC is 58 to 65.1.20<0.4Cr+0.4Mo+4.5V<2.60  (1)2.7C+0.4Si+Mn+0.8Cr+Mo+V>2.20  (2)