Title:
STEEL WIRE
Document Type and Number:
WIPO Patent Application WO/2018/012625
Kind Code:
A1
Abstract:
This steel wire has a specified chemical composition. In the region of an L cross-section, which is along the axial direction and includes the axial line of the steel wire, closer to the axial line than a depth of 100 µm from the surface of the steel wire, the metal structure comprises at least 90% of drawn pearlite in area ratio. In the region of the L cross-section from the surface of the steel wire to a depth of 100 µm, the metal structure comprises at least 70% of drawn pearlite in area ratio. When D is defined as the diameter of the steel wire in mm units, σHV as the standard deviation of the Vickers hardness of the surface of the steel wire, and Rp0.2 as the yield strength of the steel wire, σHV<(-9500×ln(D)+30000)×exp(-0.003×Rp0.2) is satisfied and tensile strength TS is at least 1770 MPa.
Inventors:
MANABE TOSHIYUKI (JP)
HIRAKAMI DAISUKE (JP)
OKONOGI MAKOTO (JP)
MATSUI NAOKI (JP)
ISO ARATA (JP)
HIRAKAMI DAISUKE (JP)
OKONOGI MAKOTO (JP)
MATSUI NAOKI (JP)
ISO ARATA (JP)
Application Number:
PCT/JP2017/025782
Publication Date:
January 18, 2018
Filing Date:
July 14, 2017
Export Citation:
Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/32; C21D8/06
Domestic Patent References:
| WO2015186801A1 | 2015-12-10 | |||
| WO2010150537A1 | 2010-12-29 | |||
| WO2008093466A1 | 2008-08-07 |
Foreign References:
| JP2013249492A | 2013-12-12 | |||
| JP2005163082A | 2005-06-23 | |||
| US20040118486A1 | 2004-06-24 | |||
| JP2016139744A | 2016-08-04 | |||
| JP3984393B2 | 2007-10-03 | |||
| JP3036393B2 | 2000-04-24 | |||
| JP4377715B2 | 2009-12-02 |
Other References:
LECTURES, MODERN METALLURGY, MATERIALS VOL. 4, FERROUS MATERIALS, vol. 4, pages 43
See also references of EP 3486345A4
See also references of EP 3486345A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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