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Title:
STEEL MATERIAL
Document Type and Number:
WIPO Patent Application WO/2019/182054
Kind Code:
A1
Abstract:
The steel material according to an embodiment of the present invention has a predetermined chemical composition, and includes, in a region in which a distance r from the center of a cross-section thereof perpendicular to the length direction thereof satisfies 0.7R≤r≤0.9R, a structure that contains ferrite and bainite and in which the average fraction of the ferrite is in the range of 40-70% by area percentage, the average value of the total of the average fractions of structures other than the ferrite and the bainite is 0-3%, and the balance is bainite, and the standard deviation of the fraction of the ferrite in the region is 4% or less.

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Inventors:
KOYAMA TATSUYA (JP)
NEISHI YUTAKA (JP)
Application Number:
PCT/JP2019/011847
Publication Date:
September 26, 2019
Filing Date:
March 20, 2019
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/60; B22D11/00; B22D11/20; B22D11/22; C21D1/06; C21D8/06; C21D9/32
Domestic Patent References:
WO2014171472A12014-10-23
WO2011055651A12011-05-12
Foreign References:
JP2011157597A2011-08-18
JP2014185389A2014-10-02
JP2006097066A2006-04-13
JP2018056867A2018-04-05
Other References:
See also references of EP 3770291A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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