Title:
STEEL SHEET AND PLATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2021/124864
Kind Code:
A1
Abstract:
A steel sheet according to the present invention has a predetermined chemical composition; the metal structure of this steel sheet at 1/4 the sheet thickness from the surface contains, in area fraction, 90% or more of ferrite and less than 3% of residual austenite; the average crystal grain size excluding the residual austenite is 10.0 μm or less; the average aspect ratio of crystal grains excluding the residual austenite is 0.3 or more; the standard deviation of the Mn concentration is 0.60% by mass or less; and the tensile strength is 980 MPa or more.
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Inventors:
YOSHIDA MITSURU (JP)
HAYASHI KOUTAROU (JP)
SHUTO HIROSHI (JP)
HAYASHI KOUTAROU (JP)
SHUTO HIROSHI (JP)
Application Number:
PCT/JP2020/044619
Publication Date:
June 24, 2021
Filing Date:
December 01, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C21D9/46; C22C38/58
Domestic Patent References:
| WO2013099206A1 | 2013-07-04 |
Foreign References:
| JP2007270197A | 2007-10-18 | |||
| JP2007070648A | 2007-03-22 |
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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