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Title:
ROLLING ROD FOR COLD-FORGED THERMALLY REFINED ARTICLE
Document Type and Number:
WIPO Patent Application WO/2017/094870
Kind Code:
A1
Abstract:
Provided is a rolling rod for a cold-forged thermally refined article, the rolling rod having superior cold workability, and, when subjected to cold forging and thermal refining, a high strength and superior anti hydrogen embrittlement properties. A rolling rod for a cold-forged thermally refined article according to the present invention contains, in terms of % by mass: 0.22-0.40 % C; 0.35-1.5 % Si; 0.20-0.40 % Mn; less than 0.020 % P; less than 0.015 % S; 0.70-1.45 % Cr; 0.005-0.060 % Al; 0.01-0.05 % Ti; 0.0003-0.0040 % B; 0.0020-0.0080 % N; and less than or equal to 0.0020 % O, wherein the balance includes Fe and impurities. The rolling rod has a chemical composition that satisfies expressions (1) and (2), wherein the total fractional area of proeutectoid ferrite and perlite is 90 % or greater, the fractional area of the proeutectoid ferrite is 30 % or greater, and the tensile strength is 700 MPa or less. 0.50 ≤ C + Si/10 + Mn/5 + 5Cr/22 ≤ 0.85 (1) Si/Mn > 1.0 (2)

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Inventors:
SANO NAOYUKI (JP)
MATSUI NAOKI (JP)
NEISHI YUTAKA (JP)
Application Number:
PCT/JP2016/085854
Publication Date:
June 08, 2017
Filing Date:
December 02, 2016
Export Citation:
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Assignee:
NIPPON STEEL & SUMITOMO METAL CORP (JP)
International Classes:
C22C38/00; C22C38/54; F16B35/00; C21D8/06; C21D9/00
Domestic Patent References:
WO2016080308A12016-05-26
Foreign References:
JP2009527638A2009-07-30
JP2015189987A2015-11-02
JP2012237052A2012-12-06
JP2014148739A2014-08-21
JP2013227602A2013-11-07
JP2010196094A2010-09-09
JP2007277705A2007-10-25
JP2006307272A2006-11-09
JPH1129842A1999-02-02
JPH09194999A1997-07-29
Other References:
See also references of EP 3385400A4
Attorney, Agent or Firm:
ASCEND IP LAW FIRM (JP)
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