Title:
STEEL WIRE
Document Type and Number:
WIPO Patent Application WO/2021/075509
Kind Code:
A1
Abstract:
The present invention provides a steel wire which is formed into a spring that has excellent fatigue limit. The chemical composition of a steel wire according to one embodiment of the present invention comprises, in mass%, from 0.53% to 0.59% of C, from 2.51% to 2.90% of Si, from 0.70% to 0.85% of Mn, 0.020% or less of P, 0.020% or less of S, from 1.40% to 1.70% of Cr, from 0.17% to 0.53% of Mo, from 0.23% to 0.33% of V, 0.050% or less of Cu, 0.050% or less of Ni, 0.0050% or less of Al, 0.050% or less of Ti, 0.0070% or less of N, from 0% to 0.0050% of Ca and from 0% to 0.020% of Nb, with the balance being made up of Fe and impurities. The number density of V-based precipitates (10) having a maximum diameter of from 2 nm to 10 nm is from 500 to 8,000 per μm2.
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Inventors:
TERAMOTO SHINYA (JP)
NEISHI YUTAKA (JP)
AONO MICHIMASA (JP)
KOZAWA SHUJI (JP)
MINETA SATORU (JP)
OCHI TATSURO (JP)
SUZUKI SHOICHI (JP)
NEISHI YUTAKA (JP)
AONO MICHIMASA (JP)
KOZAWA SHUJI (JP)
MINETA SATORU (JP)
OCHI TATSURO (JP)
SUZUKI SHOICHI (JP)
Application Number:
PCT/JP2020/038954
Publication Date:
April 22, 2021
Filing Date:
October 15, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
NIPPON STEEL SG WIRE CO LTD (JP)
NIPPON STEEL SG WIRE CO LTD (JP)
International Classes:
C21C7/076; C21D7/06; C21D8/06; C21D9/02; C21D9/52; C22C38/00; C22C38/50; F16F1/02
Foreign References:
| JP2018178184A | 2018-11-15 | |||
| JP2018176268A | 2018-11-15 | |||
| JP2010222604A | 2010-10-07 |
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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