| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treated steel sheet excellent in seam weldability, capable of stably producing a welded can in a state of being nongrind, good in the color tone of the steel sheet and furthermore combining corrosion resistance. SOLUTION: In a surface treated steel sheet in which both sides of a steel sheet base are successively applied with a tinning layer, a metallic chromium layer and a chromium hydrated oxide layer, the coating weight of the tinning layer is regulated to 0.3 to 3.0<2> g/m per side of the steel sheet, furthermore, the existing form of tin is regulated to the one of being granularly scattered onto the surface of the steel sheet, also, the average particle diameter of the tin grains is regulated to 0.1 to 5μm, its area ratio occupied in the steel sheet is regulated to 10 to 70%, the coating weight of the metallic chromium is regulated to 110 to 300 mg/m<2> per side of the steel sheet, and the coating weight of the chromium hydrated oxide layer is regulated to the range of 3 to 30 mg/m<2> per smde of the steel sheet.
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