SURFACE-TREATED TIN-PLATED STEEL SHEET FOR WELDED CAN AND WELDED CAN MADE THEREOF

摘要

A surface-treated tin-plated steel sheet for welded cans forming a surface-treating layer comprising chiefly a silane coupling agent on the surface of a tin-plated layer formed on the surface of a steel sheet, wherein the amount of free tin (Sn) (X g/m 2 ) in the tin-plated layer and the amount of silicon (Si) (Y mg/m 2 ) in the surface-treating layer lie in ranges satisfying all of the following formulas, 0.2 ‰¦ X ‰¦ 13, Y ‰§ 1.0, Y ‰¦ 1.58X + 6.92 and Y ‰¦ -0.36X + 10.70. Despite of a non-chromium surface treatment, the surface-treated tin-plated steel sheet features excellent weldability, particularly high-speed weldability, close adhesion during the working and excellent corrosion resistance.