| 摘要 |
PURPOSE:To obtain a steel sheet having a pure Sn layer formed discontinuously on an Ni-Sn-Fe alloy layer by plating the surface of a steel sheet with Ni, electrolytically tinning it by a specified extent of deposition, washing the steel sheet with washing water contg. no additive and subjecting it to reflow treatment at a specified temp. CONSTITUTION:The surface of a steel sheet is plated with Ni, and Sn is deposited by electrolytic tinning by 0.66-1.12g/m<2>. The steel sheet is then washed with washing water contg. no additive and it is subjected to reflow treatment at 235-250 deg.C. Thus, a surface treated steel sheet for a welded can having a pure Sn layer formed discontinuously on an Ni-Sn-Fe alloy layer is efficiently produced with high productivity.
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