Title:
HIGH-STRENGTH HOT-DIP GALVANIZED STEEL SHEET AND PROCESS FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2013/157222
Kind Code:
A1
Abstract:
A hot-dip galvannealed steel sheet which comprises a steel sheet that has a composition containing, in terms of mass%, 0.02-0.30% C, 0.01-2.5% Si, 0.1-3.0% Mn, 0.003-0.08% P, up to 0.01% S, 0.001-0.20% Al, and 0.03-0.40% Ti, with the remainder comprising Fe and unavoidable impurities, and a zinc coating layer formed on each of the surfaces thereof in an amount of 20-120 g/m2 per surface, wherein each coating layer contains carbide grains having an average grain diameter of 10 nm or smaller in a number of 5-50 per section and oxide grains having an average grain diameter of 50 nm or larger in a number of 5-50 per section. The section means an area (t1×1 (µm2)) defined by the coating-layer thickness (t1 µm) and segments obtained by dividing a cross-section of the coating layer in the direction perpendicular to the thickness direction at an interval of 1 µm.
Inventors:
SUZUKI YOSHITSUGU (JP)
HARAKO DAISUKE (JP)
NAGATAKI YASUNOBU (JP)
HARAKO DAISUKE (JP)
NAGATAKI YASUNOBU (JP)
Application Number:
PCT/JP2013/002420
Publication Date:
October 24, 2013
Filing Date:
April 09, 2013
Export Citation:
Assignee:
JFE STEEL CORP (JP)
International Classes:
C23C2/06; C21D1/76; C21D9/46; C22C38/00; C22C38/14; C23C2/02; C23C2/28
Foreign References:
| JP2007231373A | 2007-09-13 | |||
| JPS64299A | 1989-01-05 |
Attorney, Agent or Firm:
KUMASAKA, Akira et al. (JP)
Akira Kumasaka (JP)
Akira Kumasaka (JP)
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