Title:
WIRE FOR HIGH-STRENGTH SPRING, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2017/122827
Kind Code:
A1
Abstract:
Provided are: a wire for a high-strength spring containing, in % by mass, C: 0.55-0.63%, Si: 1.90-2.30%, Mn: 0.15-0.55%, P: more than 0% but no more than 0.015%, S: more than 0% but no more than 0.015%, Al: 0.001-0.1%, Cu: 0.15-0.45%, Ni: 0.35-0.75%, Cr: 0.36-0.65%, and Ti: 0.04-0.11%, with the remainder being made up of iron and unavoidable impurities, and an ideal critical diameter DCI represented by formula (1) not exceeding 120, the hydrogen content of steel not exceeding 0.30ppm, the prior austenite crystal grain size being at least 9.5, and the percentage of the entire structure accounted for by perlite not exceeding 1% by area; and a method for producing the wire for a high-strength spring. (1) DCI = 25.4 × (0.171 + 0.001 × [C] + 0.265 × [C]2) × (3.3333 × [Mn] + 1) × (1 + 0.7 × [Si]) × (1 + 0.363 × [Ni]) × (1 + 2.16 × [Cr]) × (1 + 0.365 × [Cu]) × (1 + 1.73 × [V]) × (1 + 3 × [Mo]).
Inventors:
TAKEDA ATSUHIKO
MASUDA TOMOKAZU
YASUI TAKAYUKI
MASUDA TOMOKAZU
YASUI TAKAYUKI
Application Number:
PCT/JP2017/001266
Publication Date:
July 20, 2017
Filing Date:
January 16, 2017
Export Citation:
Assignee:
KOBE STEEL LTD (JP)
International Classes:
C22C38/00; C21D8/06; C21D9/52; C22C38/50; C22C38/54; F16F1/02
Domestic Patent References:
| WO2015098531A1 | 2015-07-02 | |||
| WO2014097872A1 | 2014-06-26 | |||
| WO2013179934A1 | 2013-12-05 |
Foreign References:
| CN103725984A | 2014-04-16 |
Attorney, Agent or Firm:
SAMEJIMA, Mutsumi et al. (JP)
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