Painted steel plate

Abstract

[Problem] To address the issue of coating steel sheets using Zn-plated steel sheets, achieving both the concealment of discoloration caused by the substrate and the adhesion of the colored film during processing. [Solution] The coated steel sheet of this embodiment comprises: a Zn-plated steel sheet and a colored film layer; the thickness of the colored film layer is 3.0~10.0μm; the area ratio of the colored pigment in the colored film layer is 10~50%; in a cross-section obtained by cutting the colored film layer in the thickness direction, imaginary grid lines are set at 1μm intervals, and the grid lines divide the area into 1μm×1μm regions, and the area ratio of the colored pigment is measured for at least 500 regions. In the measured results, the proportion of regions with an area ratio of 0% or more and less than 10% relative to all measured regions is within the range of 10~40%, and the proportion of regions with an area ratio of 60% or more and less than 100% relative to all measured regions is within the range of 10~40%.

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