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.
ISHIGAKI HAJIME
JP2008214645A | 2008-09-18 |
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