Title:
SPRING STEEL AND SPRING
Document Type and Number:
WIPO Patent Application WO/2013/024876
Kind Code:
A1
Abstract:
Provided is a spring steel that ultimately forms a high strength spring by maximizing a temper softening resistance effect achieved by alloying elements while suppressing the generation of a SiO2 hard inclusion or the occurrence of decarbonization, which cause a deterioration in the fatigue characteristics of a spring. This spring steel is characterized by containing, in terms of mass %, 0.50 to 0.70% of C, 1.00 to 5.00% of Si, 0.30 to 2.00% of Mn, 0.0002 to 0.0500% of P, 0.0002 to 0.0500% of S, 0.10 to 3.50% of Cr, 0.0005 to 0.0500% of Al and 0.0020 to 0.0100% of N, with the remainder comprising Fe and unavoidable impurities, wherein the value of H, as defined by formula (a) is 160 or higher and the value of C, as defined by formula (b), is 3.25 or lower.
H = 33.6[C] + 10.0[Si] + 5.95[Mn] + 11.1[Cr] + 90.0···(a)
C = [Si]/[Mn]···(b)
Inventors:
TERAMOTO SHINYA (JP)
KUBOTA MANABU (JP)
KUBOTA MANABU (JP)
Application Number:
PCT/JP2012/070767
Publication Date:
February 21, 2013
Filing Date:
August 15, 2012
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
TERAMOTO SHINYA (JP)
KUBOTA MANABU (JP)
TERAMOTO SHINYA (JP)
KUBOTA MANABU (JP)
International Classes:
C22C38/60; F16F1/02; C21D1/06; C21D9/02
Domestic Patent References:
WO2012005373A1 | 2012-01-12 |
Foreign References:
JP2007169688A | 2007-07-05 | |||
JP2009024245A | 2009-02-05 | |||
JP2007302950A | 2007-11-22 | |||
JPS62177152A | 1987-08-04 |
Other References:
See also references of EP 2746420A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
Aoki 篤 (JP)
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Claims: