Title:
STEEL SHEET AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2023/008163
Kind Code:
A1
Abstract:
A steel sheet having a chemical composition comprising, in mass%, 0.030-0.200% of C, 0.050-0.500% of Si, 0.50-2.00% of Mn, not more than 0.030% of P, not more than 0.010% of S, 0.001-0.100% of Al, 0.0005-0.0080% of N, 0.0005-0.0080% of O, 0.001-0.050% of Ti, 0.001-0.050% of Nb, 0.01-0.50% of Cu, 0.01-0.10% of Mo, and 0.01-0.30% of Sn, the remaining portion being Fe and impurities, wherein the total contained amount of solid solution Mo and solid solution Sn at the surface portion of the steel sheet is 0.005% or more, the metal structure at a 1/4t positon includes 5-30% of perlite, not more than 10% of bainite, and ferrite for the remaining portion, the metal structure at a 1/10t positon includes 1-20% of perlite, not more than 5% of bainite, and ferrite for the remaining portion, the mean particle diameter of ferrite at the 1/10t positon is 5-50 μm, and the mean particle diameter of perlite at the 1/10t positon is not more than 30 μm.
Inventors:
NAKAI KEISUKE (JP)
ITO MINORU (JP)
ITO MINORU (JP)
Application Number:
PCT/JP2022/027274
Publication Date:
February 02, 2023
Filing Date:
July 11, 2022
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/02; C22C38/16; C22C38/60
Domestic Patent References:
| WO2020184683A1 | 2020-09-17 | |||
| WO2019176112A1 | 2019-09-19 |
Foreign References:
| CN105821314A | 2016-08-03 | |||
| JP2004204344A | 2004-07-22 | |||
| JP2010196166A | 2010-09-09 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
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