Title:
HIGH-STRENGTH SPRING STEEL
Document Type and Number:
WIPO Patent Application WO/2011/078165
Kind Code:
A1
Abstract:
Provided is a spring steel that contains 0.15-0.40% carbon, 1-3.5% silicon, 0.20-2.0% manganese, 0.05-1.20% chromium, at most 0.030% phosphorus, at most 0.02% sulfur, and at least one of the following: 0.005-0.10% titanium, 0.005-0.05% niobium, and at most 0.25% vanadium. The remainder of said spring steel comprises iron and unavoidable impurities. The carbon equivalent (Ceq1) of the provided spring steel, as calculated by formula (1), is at most 0.55.
(1) Ceq1 = [C] + 0.108×[Si] − 0.067×[Mn] + 0.024×[Cr] − 0.05×[Ni] + 0.074×[V]
(In formula (1), each symbol in brackets represents the content (mass%) of the corresponding element.)
Inventors:
NAGAMATSU SAYAKA
MARUO TOMOTADA
YOSHIHARA NAO
MARUO TOMOTADA
YOSHIHARA NAO
Application Number:
PCT/JP2010/073003
Publication Date:
June 30, 2011
Filing Date:
December 21, 2010
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
NAGAMATSU SAYAKA
MARUO TOMOTADA
YOSHIHARA NAO
NAGAMATSU SAYAKA
MARUO TOMOTADA
YOSHIHARA NAO
International Classes:
C22C38/00; C21D9/02; C22C38/38; C22C38/58; C21D7/06
Foreign References:
| JP2001049337A | 2001-02-20 | |||
| JPH11323495A | 1999-11-26 | |||
| JP2004263247A | 2004-09-24 | |||
| JP2009046764A | 2009-03-05 | |||
| JP4406341B2 | 2010-01-27 | |||
| JP3577411B2 | 2004-10-13 | |||
| JP3246733B2 | 2002-01-15 |
Other References:
See also references of EP 2518175A4
Attorney, Agent or Firm:
TANAKA, Mitsuo et al. (JP)
Mitsuo Tanaka (JP)
Mitsuo Tanaka (JP)
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