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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 10350676 B1

PDFFull Text
Date of Patent:
Jul. 16, 2019

Filed:

Apr. 23, 2013

Spring steel with excellent fatigue resistance and method of manufacturing the same

Applicant:

Nippon Steel & Sumitomo Metal Corporation, Tokyo, JP;

Inventors:

Masafumi Miyazaki, Kisarazu, JP;

Hideaki Yamamura, Sendai, JP;

Masayuki Hashimura, Kisarazu, JP;

Takashi Fujita, Kisarazu, JP;

Assignee:

NIPPON STEEL & SUMITOMO METAL CORPORATION, Tokyo, JP;

Attorney:

Birch, Stewart, Kolasch & Birch, LLP

Primary Examiner:

Colleen P Dunn

Assistant Examiner:

Rajinder Bajwa

Int. Cl.
CPC ...
C21C 7/00 (2006.01); B22D 11/11 (2006.01); C22C 38/26 (2006.01); C22C 38/24 (2006.01); C21C 7/06 (2006.01); C22C 38/00 (2006.01); C22C 38/58 (2006.01); C22C 38/04 (2006.01); C22C 38/06 (2006.01); C22C 38/20 (2006.01); C22C 38/22 (2006.01); C22C 38/28 (2006.01); C22C 38/32 (2006.01); C22C 38/34 (2006.01); C22C 38/40 (2006.01); C21C 7/10 (2006.01); C21D 8/06 (2006.01); C21D 9/02 (2006.01); B22D 11/00 (2006.01); B22D 11/113 (2006.01); B22D 11/114 (2006.01); C21D 1/26 (2006.01); C21D 6/00 (2006.01); C22C 38/02 (2006.01); C22C 38/08 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/42 (2006.01); C22C 38/44 (2006.01); C22C 38/46 (2006.01); C22C 38/48 (2006.01); C22C 38/50 (2006.01); C22C 38/54 (2006.01);
U.S. Cl.
CPC ...
B22D 11/11 (2013.01); B22D 11/001 (2013.01); B22D 11/113 (2013.01); B22D 11/114 (2013.01); C21C 7/0006 (2013.01); C21C 7/0075 (2013.01); C21C 7/06 (2013.01); C21C 7/10 (2013.01); C21D 1/26 (2013.01); C21D 6/004 (2013.01); C21D 6/005 (2013.01); C21D 6/008 (2013.01); C21D 8/065 (2013.01); C21D 9/02 (2013.01); C22C 38/00 (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 38/08 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (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 38/34 (2013.01); C22C 38/40 (2013.01); C22C 38/42 (2013.01); C22C 38/44 (2013.01); C22C 38/46 (2013.01); C22C 38/48 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); C22C 38/58 (2013.01); C21D 8/06 (2013.01); C21D 2211/004 (2013.01);
Abstract

A spring steel includes a predetermined chemical composition and a composite inclusion having a maximum diameter of 2 μm or more that TiN is adhered to an inclusion containing REM, O and Al, in which the number of the composite inclusion is 0.004 pieces/mmto 10 pieces/mm, the maximum diameter of the composite inclusion is 40 μm or less, the sum of the number density of an alumina cluster having the maximum diameter of 10 μm or more, MnS having the maximum diameter of 10 μm or more and TiN having the maximum diameter of 1 μm to 10 pieces/mm.

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