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Title:
HIGH-STRENGTH STEEL WIRE
Document Type and Number:
WIPO Patent Application WO/2019/004454
Kind Code:
A1
Abstract:
A high-strength steel wire comprising a predetermined material composition, wherein: in a cross-section including a central axis of the steel wire and parallel to the central axis, the area ratio of pearlite structures in the steel wire is 90% or greater, the area ratio of pearlite structures in a surface layer part of the steel wire is 80% or greater, and from among the structures over the whole of the steel wire, the area ratio of lamellar pearlite structures with an average cementite length of 1.0 µm or larger is 30% to 65%, and the area ratio of fragmented pearlite structures with an average cementite length of 0.30 µm or smaller is 20% to 50%; and the steel wire has a tensile strength of 1,960 MPa or greater.

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Inventors:
OKONOGI MAKOTO (JP)
MATSUI NAOKI (JP)
Application Number:
PCT/JP2018/024904
Publication Date:
January 03, 2019
Filing Date:
June 29, 2018
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/54; C21D8/06
Domestic Patent References:
WO2016024635A12016-02-18
WO2017069207A12017-04-27
Foreign References:
JP2000297323A2000-10-24
JP2000336459A2000-12-05
JP3130445B22001-01-31
JP5169839B22013-03-27
JP3725576B22005-12-14
JP2553612B21996-11-13
JP2017128871A2017-07-27
Other References:
See also references of EP 3647446A4
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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