SURFACE-TREATED TIN-PLATED STEEL SHEET FOR WELDED CANS AND WELDED CANS MADE THEREFROM
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United States of America Patent
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Issued Date -
Dec 23, 2010
app pub date -
Aug 6, 2008
filing date -
Aug 23, 2007
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Abandoned
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Abstract
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.sup.2) in the tin-plated layer and the amount of silicon (Si) (Y mg/m.sup.2) in the surface-treating layer lie in ranges satisfying all of the following formulas, 0.2.ltoreq.X.ltoreq.13, Y.gtoreq.1.0, Y.ltoreq.1.58X+6.92 and Y.ltoreq.-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.
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