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Title:
HIGH-STRENGTH SPRING, METHOD FOR PRODUCING SAME, STEEL FOR HIGH-STRENGTH SPRING, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2018/074003
Kind Code:
A1
Abstract:
Provided is a high-strength spring containing, by mass%, C: 0.40 to 0.50%, Si: 1.00 to 3.00%, Mn: 0.30 to 1.20%, Ni: 0.05 to 0.50%, Cr: 0.35 to 1.50%, Mo: 0.03 to 0.50%, Cu: 0.05 to 0.50%, Al: 0.005 to 0.100%, V: 0.05 to 0.50%, Nb: 0.005 to 0.150%, N: 0.0100 to 0.0200%, where P is restricted to no more than 0.015% and S is restricted to no more than 0.010%, with Fe and inevitable impurities as the balance. The high-strength spring includes: an Nb compound that contains at least one of an Nb carbide, Nb nitride and Nb carbonitride; and a V compound that is precipitated around the Nb compound and that contains at least one of V carbide and V carbonitride.

Inventors:
WATANABE MOTOKI (JP)
MINOGUCHI KOKI (JP)
OISHI HIROYUKI (JP)
Application Number:
PCT/JP2017/020501
Publication Date:
April 26, 2018
Filing Date:
June 01, 2017
Export Citation:
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Assignee:
MITSUBISHI STEEL MFG (JP)
International Classes:
C22C38/00; C21D9/02; C22C38/48
Domestic Patent References:
WO2006022009A12006-03-02
Foreign References:
JP2016125119A2016-07-11
JPH05320827A1993-12-07
JP2001131699A2001-05-15
JP2001288539A2001-10-19
Other References:
See also references of EP 3336214A4
Attorney, Agent or Firm:
ITOH Tadashige et al. (JP)
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