| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface treated steel sheet which has excellent solderability, rust resistance, electric conductivity and whisker resistance. SOLUTION: In the surface treated steel sheet, as a lower layer, tinning is present, and as an upper layer, a V-containing layer is present. Alternatively, the steel sheet is subjected to galvanizing as an intermediate layer. Alternatively, the steel sheet is subjected to diffusion treatment by heat treatment. Thus, the surface treated steel sheet having excellent solderability, rust resistance, electric conductivity and whisker resistance is provided.
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