| 摘要 |
PROBLEM TO BE SOLVED: To provide a highly durable coated steel plate suppressed in the rise in temperature due to solar rays and excellent in coating film deterioration resistance and corrosion resistance. SOLUTION: As a substrate plating steel plate, a Zn alloy plated steel plate containing 1-10 mass% Mg, 2-19 mass% Al, and 0.01-2 mass% Si is used, and characterized in that Mg and Al satisfy Mg (mass%)+Al (mass%)≤20 mass% and the remainder comprises Zn and inevitable impurities. A topcoating layer containing 2-60 mass% of an infrared-resistant pigment and having not less than 4.0% of solar radiation reflectivity at a wavelength of 780-2,100 nm is provided to the uppermost layer of at least the single surface of the Zn alloy plated steel plate to obtain the highly durable coated steel plate. COPYRIGHT: (C)2004,JPO
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