Title:
HIGH-STRENGTH AND HIGH-DUCTILITY STEEL FOR SPRING, METHOD FOR PRODUCING SAME, AND SPRING
Document Type and Number:
WIPO Patent Application WO2010110041
Kind Code:
A1
Abstract:
Disclosed is a steel for springs, which has the following overall composition (% by mass): C: 0.5 to 0.6%, Si: 1.0 to 1.8%, Mn: 0.1 to 1.0%, Cr: 0.1 to 1.0%, P: 0.035% or less, and S: 0.035% or less, with the remainder being iron and unavoidable impurities, wherein, in the area of the internal structure in an arbitrary cross-section surface of the steel, bainite makes up 65% or more, remaining austenite makes up 6 to 13% and martensite makes up the remainder (including 0%), and wherein the average C concentration in the remaining austenite is 0.65 to 1.7%. The steel for springs can have a tensile strength as high as 1800 MPa or more and high ductility.
Inventors:
SUZUKI TAKESHI (JP)
ONO YOSHIKI (JP)
ONO YOSHIKI (JP)
Application Number:
PCT/JP2010/053794
Publication Date:
September 30, 2010
Filing Date:
March 08, 2010
Export Citation:
Assignee:
NHK SPRING CO LTD (JP)
SUZUKI TAKESHI (JP)
ONO YOSHIKI (JP)
SUZUKI TAKESHI (JP)
ONO YOSHIKI (JP)
International Classes:
C22C38/34; C21D6/00; C21D9/02; F16F1/02
Foreign References:
| JP2002048693A | 2002-02-15 | |||
| JPH05320749A | 1993-12-03 | |||
| JPS5842246B2 | 1983-09-19 | |||
| JPS63312917A | 1988-12-21 | |||
| JP2007154240A | 2007-06-21 | |||
| JP2006291291A | 2006-10-26 | |||
| JP3783306B2 | 2006-06-07 | |||
| JP2005023404A | 2005-01-27 | |||
| JP2001288530A | 2001-10-19 | |||
| JP2002212665A | 2002-07-31 | |||
| JPS5129492B2 | 1976-08-26 | |||
| JP2007100209A | 2007-04-19 |
Other References:
See also references of EP 2412840A4
Attorney, Agent or Firm:
SUENARI, Mikio (JP)
End 成 Mikio (JP)
End 成 Mikio (JP)
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