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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 9732407 B1

PDFFull Text
Date of Patent:
Aug. 15, 2017

Filed:

Oct. 05, 2012

Bearing steel and method for producing same

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Masayuki Hashimura, Tokyo, JP;

Masafumi Miyazaki, Tokyo, JP;

Hideaki Yamamura, Tokyo, JP;

Takahisa Suzuki, Tokyo, JP;

Takashi Fujita, Tokyo, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Helene Klemanski

Int. Cl.
CPC ...
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/24 (2006.01); C22C 38/26 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/50 (2006.01); C21C 7/06 (2006.01); C21D 1/32 (2006.01); C21D 9/40 (2006.01); C21D 9/36 (2006.01); B22D 11/01 (2006.01); B22D 27/02 (2006.01); C21D 8/00 (2006.01); C22C 38/00 (2006.01); C21C 7/064 (2006.01); F16C 33/62 (2006.01);
U.S. Cl.
CPC ...
C22C 38/50 (2013.01); B22D 11/015 (2013.01); B22D 27/02 (2013.01); C21C 7/06 (2013.01); C21C 7/0645 (2013.01); C21D 1/32 (2013.01); C21D 8/005 (2013.01); C21D 9/36 (2013.01); C21D 9/40 (2013.01); C22C 38/001 (2013.01); C22C 38/002 (2013.01); C22C 38/005 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/20 (2013.01); C22C 38/22 (2013.01); C22C 38/24 (2013.01); C22C 38/26 (2013.01); C22C 38/28 (2013.01); C22C 38/32 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); F16C 33/62 (2013.01); F16C 2300/02 (2013.01);
Abstract

A bearing steel includes, as a metallographic structure, inclusions which contain complex oxysulfides including Rare Earth Metal, Ca, O, S, and Al, TiN, MnS, AlO, and complex oxides including Al and Ca, wherein, a number fraction of the complex oxysulfides in a total number of the inclusions is 50% to less than 100% and a number of complex oxysulfides having a major axis of 5 μm or more is 0.001 pieces to 2 pieces in an observed section of 1 mm, and a number of TiN existing independently from the complex oxysulfides and having a major axis of 5 μm or more is 0.001 pieces to less than 1.0 piece in an observed section of 1 mm.

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