Title:
HIGH STRENGTH STAINLESS STEEL WIRE AND SPRING
Document Type and Number:
WIPO Patent Application WO/2024/018520
Kind Code:
A1
Abstract:
The present invention uses a high strength stainless steel wire which contains C, Si, Mn, P, S, Ni, Cr, N, Al, O and Ca and in which the total amount of Ti, Nb, Ta and W is 0.50% or less, with the remainder comprising Fe and impurities. The value of Md30 represented by formula (1) is 0-30 (ºC). The strength of the steel wire is 1800 MPa or more. The amount of strain-induced martensite is 20-80 vol.%. The tensile residual stress in the longitudinal direction in a surface layer of the steel wire is 500 MPa or less. Formula 1: Md30(ºC)=551-462(C+N)-9.2Si-8.1Mn-29(Ni+Cu)-13.7Cr-18.5Mo. However, atomic symbols in formula (1) indicate content values (mass%) of elements in the chemical composition of the steel, and if an element is not contained, a value of 0 is substituted.
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Inventors:
TAKANO KOHJI (JP)
SAKAI HIROKI (JP)
AKIURA TSUNEO (JP)
AKIZUKI TAKAYUKI (JP)
SAKAI HIROKI (JP)
AKIURA TSUNEO (JP)
AKIZUKI TAKAYUKI (JP)
Application Number:
PCT/JP2022/028039
Publication Date:
January 25, 2024
Filing Date:
July 19, 2022
Export Citation:
Assignee:
NIPPON STEEL STAINLESS STEEL CORP (JP)
NIPPON SEISEN CO LTD (JP)
NIPPON SEISEN CO LTD (JP)
International Classes:
C22C38/00; C22C38/58; C21D8/06; C21D9/02
Domestic Patent References:
| WO2019240127A1 | 2019-12-19 | |||
| WO2021124511A1 | 2021-06-24 |
Foreign References:
| JP2021195589A | 2021-12-27 |
Attorney, Agent or Firm:
MATSUNUMA Yasushi et al. (JP)
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