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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 9970072 B1

PDFFull Text
Date of Patent:
May. 15, 2018

Filed:

Dec. 02, 2013

High-strength spring steel wire with excellent hydrogen embrittlement resistance, manufacturing process therefor, and high-strength spring

Applicant:

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

Inventors:

Atsuhiko Takeda, Kobe, JP;

Nao Yoshihara, Kobe, JP;

Assignee:

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

Attorney:

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

Primary Examiner:

Scott Kastler

Assistant Examiner:

Vanessa T Luk

Int. Cl.
CPC ...
C22C 38/02 (2006.01); C22C 38/04 (2006.01); C21D 9/52 (2006.01); C21D 1/18 (2006.01); C21D 6/00 (2006.01); C21D 1/42 (2006.01); C21D 9/60 (2006.01); C22C 38/00 (2006.01); C22C 38/06 (2006.01); C22C 38/54 (2006.01); C22C 38/08 (2006.01); C22C 38/12 (2006.01); C22C 38/14 (2006.01); C22C 38/16 (2006.01); C22C 38/34 (2006.01); C21D 8/06 (2006.01); C21D 1/22 (2006.01); C21D 9/02 (2006.01); C22C 38/18 (2006.01); C22C 38/42 (2006.01); C22C 38/50 (2006.01); F16F 1/02 (2006.01);
U.S. Cl.
CPC ...
C21D 1/42 (2013.01); C21D 1/22 (2013.01); C21D 6/001 (2013.01); C21D 6/002 (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); C21D 9/525 (2013.01); C21D 9/60 (2013.01); C22C 38/00 (2013.01); C22C 38/002 (2013.01); C22C 38/02 (2013.01); C22C 38/04 (2013.01); C22C 38/06 (2013.01); C22C 38/08 (2013.01); C22C 38/12 (2013.01); C22C 38/14 (2013.01); C22C 38/16 (2013.01); C22C 38/18 (2013.01); C22C 38/34 (2013.01); C22C 38/42 (2013.01); C22C 38/50 (2013.01); C22C 38/54 (2013.01); F16F 1/021 (2013.01); C21D 2211/008 (2013.01); Y02P 10/253 (2015.11);
Abstract

A high-strength spring steel wire is provided which secures excellent hydrogen embrittlement resistance even when the adding amount of alloy elements is suppressed, and has 80 area % or more of tempered martensite and 1,900 MPa or more of the tensile strength, in which a predetermined chemical composition is satisfied, with C and Si satisfying the relation of the expression (1) below, with prior austenite grain size number being No. 10 or more, and with the hydrogen absorption amount being 14.0 ppm or more.0.73%≤[C]+[Si]/8≤0.90%  (1)where [C] and [Si] express the content (mass %) of C and Si respectively.

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