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Title:
HIGH STRENGTH STEEL WIRE
Document Type and Number:
WIPO Patent Application WO/2018/021574
Kind Code:
A1
Abstract:
A high strength steel wire with a specified chemical composition, wherein: the metal structure has at least 95 area% of pearlite structure; the average aspect ratio R of pearlite blocks measured in the surface layer in axial direction cross-sections that comprise the axis of the steel wire is at least 2.0; when the diameter of the steel wire is D, (average aspect ratio measured in the surface layer)/(average aspect ratio measured at the 0.25D position) in axial direction cross-sections that comprise the axis of the steel wire is at least 1.1; and tensile strength is at least 1800 MPa.

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Inventors:
OKONOGI MAKOTO (JP)
MATSUI NAOKI (JP)
Application Number:
PCT/JP2017/027578
Publication Date:
February 01, 2018
Filing Date:
July 28, 2017
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/04; C22C38/54; C21D8/06; C21D9/52
Domestic Patent References:
WO2015186801A12015-12-10
WO2013031640A12013-03-07
WO2016021556A12016-02-11
WO2014208492A12014-12-31
WO2012124679A12012-09-20
Foreign References:
JP2012041587A2012-03-01
JP2004360005A2004-12-24
JP2009280836A2009-12-03
JP2016150584A2016-08-22
Other References:
See also references of EP 3492616A4
Attorney, Agent or Firm:
TAIYO, NAKAJIMA & KATO (JP)
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