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Title:
HOT-ROLLED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2021/065346
Kind Code:
A1
Abstract:
This hot-rolled steel sheet has a predetermined chemical composition and is configured such that: with respect to the metal structure of this hot-rolled steel sheet, residual austenite constitutes less than 3.0% by area, ferrite constitutes 15.0% by area or more but less than 60.0% by area, and pearlite constitutes less than 5.0% by area; L60/L7, which is the ratio of the length L60 of the grain boundary at a crystal misorientation of 60° with respect to the <110> direction to the length L7 of the grain boundary at a crystal misorientation of 7° with respect to the <110> direction, is less than 0.60; the standard deviation of the Mn concentration is 0.60% by mass or less; and the tensile strength is 980 MPa or more.

Inventors:
SHUTO HIROSHI (JP)
TSUTSUI KAZUMASA (JP)
HAYASHI KOUTAROU (JP)
SAKAKIBARA AKIFUMI (JP)
ANDO JUN (JP)
ENDO SHOTA (JP)
Application Number:
PCT/JP2020/033593
Publication Date:
April 08, 2021
Filing Date:
September 04, 2020
Export Citation:
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Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C22C38/58; C21D8/02; C21D9/46
Foreign References:
JP2007070661A2007-03-22
JPS59222528A1984-12-14
JP2019181314A2019-10-24
JPH1161326A1999-03-05
JP2005177903A2005-07-07
JPH10168544A1998-06-23
JP2005298924A2005-10-27
Other References:
See also references of EP 4039842A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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