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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 9359661 B1

PDFFull Text
Date of Patent:
Jun. 07, 2016

Filed:

Jul. 17, 2013

Bearing steel material with excellent rolling fatigue property and bearing part

Applicant:

Kobe Steel, Ltd., Kobe-shi, JP;

Inventors:

Masaki Shimamoto, Kobe, JP;

Yosuke Shindo, Kobe, JP;

Masaki Kaizuka, Kobe, JP;

Akihiro Owaki, Kobe, JP;

Sei Kimura, Kakogawa, JP;

Tetsushi Deura, Kobe, JP;

Tomoko Sugimura, Kobe, JP;

Assignee:

Kobe Steel, Ltd., Kobe-shi, JP;

Attorney:

Oblon, McClelland, Maier & Neustadt, L.L.P.

Primary Examiner:

Scott Kastler

Assistant Examiner:

Vanessa Luk

Int. Cl.
CPC ...
C22C 29/12 (2006.01); C22C 38/28 (2006.01); C22C 38/00 (2006.01); C21D 9/40 (2006.01); F16C 33/32 (2006.01); F16C 33/34 (2006.01); F16C 33/62 (2006.01); C22C 38/02 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C21D 9/36 (2006.01); C21D 9/38 (2006.01); C22C 38/60 (2006.01); F16C 33/30 (2006.01);
U.S. Cl.
CPC ...
C22C 38/002 (2013.01); C21D 9/36 (2013.01); C21D 9/38 (2013.01); C21D 9/40 (2013.01); C22C 29/12 (2013.01); C22C 38/00 (2013.01); C22C 38/001 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/28 (2013.01); C22C 38/60 (2013.01); F16C 33/30 (2013.01); F16C 33/32 (2013.01); F16C 33/34 (2013.01); F16C 33/62 (2013.01); C21D 2211/004 (2013.01);
Abstract

A bearing steel material which contains 0.8-1.1 mass % C, 0.15-0.8 mass % Si, 0.1-1.0 mass % Mn, 1.3-1.8 mass % Cr, up to 0.05 mass % P (0 mass % is excluded), up to 0.015 mass % S (0 mass % excluded), 0.0002-0.005 mass % Al, 0.0002-0.0020 mass % Ca, 0.0005-0.010 mass % Ti, up to 0.0080 mass % N (0 mass % is excluded), and up to 0.0025 mass % O (0 mass % is excluded). The steel material contains oxide inclusions which have an average composition that comprises, in terms of mass %, 20-50% CaO, 20-50% AlO, 20-70% SiO, and 3-10% TiO.

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