Title:
STEEL SHEET AND PRODUCTION METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2020/184683
Kind Code:
A1
Abstract:
A steel sheet that has a chemical composition that is, by mass%, 0.050%–0.200% C, 0.100%–1.000% Si, 0.50%–2.00% Mn, no more than 0.030% P, no more than 0.010% S, 0.002%–0.050% Al, 0.0010%–0.0060% N, 0.0005%–0.0060% O, 0.003%–0.020% Ti, 0.01%–1.50% Cu, 0%–0.0080% Ca, 0%–0.0080% Mg, 0%–0.0080% REM, 0%–0.20% Mo, 0%–0.50% W, 0%–0.030% Nb, 0%–0.050% V, 0%–1.00% Ni, 0%–0.50% Cr, 0%–0.0030% B, 0%–0.30% Sb, 0%–0.30% Sn, 0%–0.30% Pb, 0%–0.30% As, 0%–0.30% Bi, 0%–0.50% Ta, and 0%–0.50% Zr, the remainder being Fe and impurities. The chemical composition also satisfies 0.01≤Mo+W≤0.70, and the total solid-solution Mo and solid-solution W content of a surface layer part of the steel sheet is, by mass%, at least 0.005%. The average ferrite crystal grain size at a 1/4t position is no more than 60 μm.
Inventors:
NAKAI KEISUKE (JP)
TANABE HIROHISA (JP)
SHINTAKU YOSHIAKI (JP)
NAKASHIMA KIYOTAKA (JP)
NAKAMURA SHINGO (JP)
TANABE HIROHISA (JP)
SHINTAKU YOSHIAKI (JP)
NAKASHIMA KIYOTAKA (JP)
NAKAMURA SHINGO (JP)
Application Number:
PCT/JP2020/010944
Publication Date:
September 17, 2020
Filing Date:
March 12, 2020
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
International Classes:
C22C38/00; B21B1/22; B22D11/128; C21C7/04; C21C7/10; C21D8/02; C21D9/46; C22C38/60
Foreign References:
| JP2004204344A | 2004-07-22 | |||
| JP2006137963A | 2006-06-01 | |||
| JP2010196113A | 2010-09-09 |
Attorney, Agent or Firm:
BRIGHTAS IP ATTORNEYS (JP)
Download PDF:
Previous Patent: MOUTH-COATING FEEL ENHANCER
Next Patent: CONTACT PROBE AND SIGNAL TRANSMISSION METHOD
Next Patent: CONTACT PROBE AND SIGNAL TRANSMISSION METHOD