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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.:

US 10538832 B1

PDFFull Text
Date of Patent:
Jan. 21, 2020

Filed:

Jul. 29, 2015

Steel for carbonitrided bearing

Applicants:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Jtekt Corporation, Osaka, JP;

Inventors:

Yutaka Neishi, Muroran, JP;

Takahisa Suzuki, Muroran, JP;

Tatsuya Koyama, Nishio, JP;

Shingo Yamasaki, Kimitsu, JP;

Kohei Kanetani, Kashiwara, JP;

Takashi Sada, Kashiwara, JP;

Assignees:

NIPPON STEEL CORPORATION, Tokyo, JP;

JTEKT CORPORATION, Osaka, JP;

Attorney:

Clark & Brody

Primary Examiner:

Haytham Soliman

Int. Cl.
CPC ...
C22C 38/22 (2006.01); C22C 38/32 (2006.01); C21D 9/40 (2006.01); C23C 8/80 (2006.01); C21D 1/06 (2006.01); C22C 38/24 (2006.01); F16C 33/62 (2006.01); C21D 6/00 (2006.01); C23C 8/32 (2006.01); C22C 38/00 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/12 (2006.01);
U.S. Cl.
CPC ...
C22C 38/32 (2013.01); C21D 1/06 (2013.01); C21D 6/002 (2013.01); C21D 6/008 (2013.01); C21D 9/40 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/12 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C23C 8/32 (2013.01); C23C 8/80 (2013.01); F16C 33/62 (2013.01); F16C 2204/66 (2013.01); F16C 2204/70 (2013.01); F16C 2223/16 (2013.01); F16C 2240/90 (2013.01);
Abstract

Provided is a steel for carbonitrided bearing which excels in hardenability and also excels in toughness, wear resistance, and surface-originated flaking life after quenching and tempering. A steel for carbonitrided bearing of the present embodiment has a chemical composition containing, in mass %, C: 0.22 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).1.20<0.4Cr+0.4Mo+4.5V<2.60  (1)2.7C+0.4Si+Mn+0.8Cr+Mo+V>2.20  (2)

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