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Title:
STEEL WIRE FOR SPRING EXCELLENT IN FATIGUE PROPERTY AND DRAWING PROPERTY
Document Type and Number:
WIPO Patent Application WO/2008/053884
Kind Code:
A1
Abstract:
A steel wire for springs which shows excellent drawing properties when used not only as a steel wire for springs for cold winding which is to be drawn, subsequently quenched/tempered, and processed into a steel spring, but also as a steel wire for springs for cold winding which is drawn and then directly processed into a steel spring. It gives a spring having excellent fatigue properties. The steel wire for springs, which is excellent in fatigue properties and drawing properties, comprises a steel containing carbon, silicon, manganese, chromium, titanium, boron, etc. in specific amounts and having boron, titanium, and nitrogen contents (wt.%) satisfying the following relationship (1): 0.03≤B/(Ti/3.43-N)≤5.0, the amount of boron in solution being 0.0005-0.0040% and the remainder being iron and incidental impurities. In the steel wire, the boron in solution is present at perlite nodule boundaries in a higher concentration.

Inventors:
YOSHIHARA NAO
Application Number:
PCT/JP2007/071113
Publication Date:
May 08, 2008
Filing Date:
October 30, 2007
Export Citation:
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Assignee:
KOBE STEEL LTD (JP)
YOSHIHARA NAO
International Classes:
C22C38/00; C21D8/06; C21D9/52; C22C38/34; C22C38/54; F16F1/06
Foreign References:
JP2004002994A2004-01-08
JP2000313937A2000-11-14
JPH1129839A1999-02-02
JP2002180200A2002-06-26
JP2000355736A2000-12-26
Other References:
See also references of EP 2096184A4
Attorney, Agent or Firm:
UEKI, Kyuichi et al. (1-16 Dojima 2-chome,Kita-ku, Osaka-shi, Osaka 03, JP)
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