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Patent Searching and Data


Title:
MATERIAL FOR SPRINGS, MANUFACTURING PROCESS THEREFOR, AND SPRINGS
Document Type and Number:
WIPO Patent Application WO/2013/022033
Kind Code:
A1
Abstract:
Provided are: a material for springs which exhibits both a high strength, namely, a tensile strength as high as 1900MPa or more, and high ductility; and a manufacturing process therefor. A material for springs which consists of an iron-base alloy and which comprises, in terms of area fraction of the internal structure in any cross section, 30 to 80% of tempered martensite, 5 to 70% of lower bainite, and 8 to 15% of retained austenite, with the average carbon concentration of the retained austenite being 1.0 to 2.0 wt%.

Inventors:
SUZUKI TAKESHI (JP)
ONO YOSHIKI (JP)
KUROKAWA SHIMPEI (JP)
SHIBAIRI KOSUKE (JP)
Application Number:
PCT/JP2012/070222
Publication Date:
February 14, 2013
Filing Date:
August 08, 2012
Export Citation:
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Assignee:
NHK SPRING CO LTD (JP)
SUZUKI TAKESHI (JP)
ONO YOSHIKI (JP)
KUROKAWA SHIMPEI (JP)
SHIBAIRI KOSUKE (JP)
International Classes:
C22C38/00; B24C1/10; C21D7/06; C21D9/02; C22C38/34; F16F1/06
Foreign References:
JPS605820A1985-01-12
JPH01165751A1989-06-29
JPS58193323A1983-11-11
JP2007154240A2007-06-21
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
End 成 Mikio (JP)
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Claims: