Title:
HOT-DIP ZINC-PLATED STEEL SHEET AND PROCESS FOR PRODUCTION THEREOF
Document Type and Number:
WIPO Patent Application WO/2012/081666
Kind Code:
A1
Abstract:
A hot-dip zinc-plated steel sheet comprising a steel sheet and a hot-dip zinc-plating layer formed on the steel sheet, wherein the content ratios of Si and Al in the components of the steel sheet, which are expressed in mass%, fulfill the relationship represented by the formula: 0.5 < Si+Al < 1.0, and wherein the metal structure in the steel sheet fulfills the relationship represented by the formula: {(n2)2/3×d2}/{(n1)2/3×d1}×ln(H2/H1) < 0.3 (formula B) wherein n1 represents the number of MnS precipitates in the surface layer part of the steel sheet, d1 (μm) represents the average equivalent circle diameter of the MnS precipitates in the surface layer part of the steel sheet, H1 (GPa) represents the hardness of martensite in the surface layer part of the steel sheet, n2 represents the number of MnS precipitates in the center part of the steel sheet, d2 (μm) represents the average equivalent circle diameter of the MnS precipitates in the center part of the steel sheet, and H2 (GPa) represents the hardness of martensite in the center part of the steel sheet.
Inventors:
NONAKA TOSHIKI (JP)
OGAWA TOSHIO (JP)
FUJITA NOBUHIRO (JP)
OGAWA TOSHIO (JP)
FUJITA NOBUHIRO (JP)
Application Number:
PCT/JP2011/079045
Publication Date:
June 21, 2012
Filing Date:
December 15, 2011
Export Citation:
Assignee:
NIPPON STEEL CORP (JP)
NONAKA TOSHIKI (JP)
OGAWA TOSHIO (JP)
FUJITA NOBUHIRO (JP)
NONAKA TOSHIKI (JP)
OGAWA TOSHIO (JP)
FUJITA NOBUHIRO (JP)
International Classes:
C22C38/06; C21D8/02; C21D9/46; C22C38/38
Foreign References:
| JP2007070659A | 2007-03-22 | |||
| JP2003239040A | 2003-08-27 | |||
| JP2007138262A | 2007-06-07 | |||
| JP2004308002A | 2004-11-04 | |||
| JP2010236052A | 2010-10-21 |
Other References:
"The Iron and Steel Institute of Japan Kyodo Kenkyukai Atsuen Rironbukai, Ita Atsuen no Riron to Jissai", THE IRON AND STEEL INSTITUTE OF JAPAN, 1 September 1984 (1984-09-01), pages 295 - 299, XP008170571
Attorney, Agent or Firm:
SHIGA Masatake et al. (JP)
Masatake Shiga (JP)
Masatake Shiga (JP)
Download PDF:
Claims: