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Title:
HOT-DIP GALVANNEALED STEEL SHEET AND METHOD FOR MANUFACTURING THE SAME
Document Type and Number:
Japanese Patent JP2011080126
Kind Code:
A
Abstract:

To provide a painted metal material which has superior corrosion resistance in a flat part and high electroconductivity, and besides can be manufactured by high-speed operation, and to provide a worked article by using the same.

The hot-dip galvannealed steel sheet is provided with a hot-dip galvannealed layer on the surface of the steel sheet; has a chemical composition including, by mass%, 0.10-0.18% C, 0.10-0.60% Si, 2.2-3.0% Mn, 0.1% or less P, 0.01% or less S, 0.01-0.10% sol. Al, 0.01% or less N, and further one or two of 0.15% or less Ti and 0.15% or less Nb in the range satisfying the following expression (1): 0.05≤Ti+Nb/2≤0.15; also has a steel structure containing 5.0-15% of retained austenite by an area rate; and has such mechanical properties that the tensile strength is 980 MPa or more, the total elongation is 13% or more and the yield strength is 640 MPa or less.


Inventors:
HAYASHI KOTARO
ISHIGAKI HAJIME
Application Number:
JP2009234396A
Publication Date:
April 21, 2011
Filing Date:
October 08, 2009
Export Citation:
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Assignee:
SUMITOMO METAL IND
International Classes:
C22C38/00; C21D9/46; C22C38/14; C23C2/02; C23C2/06; C23C2/28
Domestic Patent References:
JP2008214645A2008-09-18
Attorney, Agent or Firm:
Shoichi Hirose