Title:
STEEL SHEET, METHOD FOR MANUFACTURING SAME AND PLATED STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2020/195605
Kind Code:
A1
Abstract:
This steel sheet uses a steel sheet which has a specific chemical composition and a tensile strength of at least 780 MPa, and in which the average grain size at a depth position of 1/4 of the sheet thickness from the surface thereof is 15.0 μm, the total grain boundary density of a solid solution C and a solid solution B is 1.0 /nm2 to 12.0 /nm2, and the total pole density of ｛２１１｝<011> and ｛３３２｝<113> of a central part in the sheet thickness direction is at most 12.0.
Inventors:
YOSHIDA MITSURU (JP)
KOJIMA NOBUSATO (JP)
KOJIMA NOBUSATO (JP)
Application Number:
PCT/JP2020/008888
Publication Date:
October 01, 2020
Filing Date:
March 03, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; C22C38/00; C22C38/58
Domestic Patent References:
| WO2019009410A1 | 2019-01-10 | |||
| WO2018026016A1 | 2018-02-08 | |||
| WO2013103125A1 | 2013-07-11 | |||
| WO2012161248A1 | 2012-11-29 | |||
| WO2008123366A1 | 2008-10-16 | |||
| WO2018026016A1 | 2018-02-08 |
Foreign References:
| JP2012001775A | 2012-01-05 | |||
| JP2012001776A | 2012-01-05 | |||
| JP2019059420A | 2019-04-18 | |||
| JP2008255484A | 2008-10-23 | |||
| JP2014205890A | 2014-10-30 | |||
| JP2009084648A | 2009-04-23 |
Other References:
TSUCHIYAMA, T: "Heat Treatment", vol. 42, 2002, article "Physical Meaning of Tempering Parameter and Its Application for Continuous Heating or Cooling Heat Treatment Process", pages: 163 - 168
See also references of EP 3950974A4
See also references of EP 3950974A4
Attorney, Agent or Firm:
TANAI Sumio et al. (JP)
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