Title:
STEEL SHEET
Document Type and Number:
WIPO Patent Application WO/2022/181761
Kind Code:
A1
Abstract:
The present invention provides a steel sheet which has high strength, while achieving excellent appearance quality. A steel sheet which has a chemical composition that contains, in mass%, more than 0.030% but not more than 0.145% of C, 0% to 0.500% of Si, 0.50% to 2.50% of Mn, 0% to 0.100% of P, 0% to 0.020% of S, 0% to 1.000% of Al, 0% to 0.0100% of N and the like, while having a metal structure that is composed of 70% to 95% by volume of ferrite and 5% to 30% by volume of a hard phase. With respect to this steel sheet, the value X1 which is obtained by dividing the standard deviation in the sheet thickness direction of the average Mn concentration in the rolling direction at a position corresponding to 1/4 the sheet thickness by the average Mn concentration at the position corresponding to 1/4 the sheet thickness is 0.025 or less.
Inventors:
HIRONAKA SATOSHI (JP)
NAGANO MAI (JP)
ITO YASUHIRO (JP)
TAKAYAMA TAKUYA (JP)
NAGANO MAI (JP)
ITO YASUHIRO (JP)
TAKAYAMA TAKUYA (JP)
Application Number:
PCT/JP2022/007854
Publication Date:
September 01, 2022
Filing Date:
February 25, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C21D9/46; C22C18/00; C22C18/04; C22C38/00; C22C38/06; C22C38/58
Domestic Patent References:
| WO2021187238A1 | 2021-09-23 |
Foreign References:
| JP2017197787A | 2017-11-02 | |||
| JP2015193897A | 2015-11-05 | |||
| JPS63180305A | 1988-07-25 | |||
| JP2005220430A | 2005-08-18 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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