STEEL FOR LEAF SPRING WITH HIGH FATIGUE STRENGTH, AND LEAF SPRING COMPONENT

Title:

STEEL FOR LEAF SPRING WITH HIGH FATIGUE STRENGTH, AND LEAF SPRING COMPONENT

Document Type and Number:

WIPO Patent Application WO/2011/074600

Kind Code:

A1

Abstract:

Disclosed is steel for a leaf spring with high fatigue strength, which contains, in mass%, 0.40-0.54% of C, 0.40-0.90% of Si, 0.40-1.20% of Mn, 0.70-1.50% of Cr, 0.070-0.150% of Ti, 0.0005-0.0050% of B and 0.0100% or less of N, with the balance made up of Fe and unavoidable impurities. Also disclosed is a leaf spring component with high fatigue strength, which is obtained by shaping the steel for a leaf spring. The Ti content and the N content in the steel for a leaf spring satisfy the following relation: Ti/N ≥ 10. The leaf spring component has been preferably subjected to shot peening that is carried out in a temperature range from room temperature to 400˚C, while applying a bending stress of 650-1900 MPa to the leaf spring component.

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Inventors:

SUGIMOTO ATSUSHI (JP)
KURIMOTO KIYOSHI (JP)
TANGE AKIRA (JP)
GOTO YURIKA (JP)

Application Number:

PCT/JP2010/072541

Publication Date:

June 23, 2011

Filing Date:

December 15, 2010

Export Citation:

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Assignee:

AICHI STEEL CORP (JP)
NHK SPRING CO LTD (JP)
SUGIMOTO ATSUSHI (JP)
KURIMOTO KIYOSHI (JP)
TANGE AKIRA (JP)
GOTO YURIKA (JP)

International Classes:

C22C38/00; C21D7/06; C22C38/32; C22C38/54

Foreign References:

JP2008266782A	2008-11-06
JP2002097551A	2002-04-02
JPH08295984A	1996-11-12
JPH1129839A	1999-02-02
JPH09324219A	1997-12-16
JPH101746A	1998-01-06

Other References: