Surface Treated Steel Sheet

Abstract: [Problem] To further improve the thermal yellowing resistance of a coating layer even when the coating layer contains a vanadium compound. [Solution] A surface-treated steel sheet according to the present invention has: a Zn-containing plating layer disposed on the surface of a base steel sheet; a primer coating layer that is disposed on the Zn-containing plating layer and contains at least a vanadium compound; and an upper coating layer disposed on the primer coating layer, wherein the average thickness of the primer coating layer is in the range of 3.0-15.0 µm, the average thickness of the upper coating layer is in the range of 7.0-25.0 µm, the Vickers hardness of the upper coating layer is in the range of 25-70 Hv, the Vickers hardness of the primer coating layer is 20 Hv or less, and the difference between the Vickers hardness of the upper coating layer and the Vickers hardness of the primer coating layer is in the range of 5-50 Hv.

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