Surface-treated steel sheet having improved weldability and...

Details Surface-treated steel sheet having improved weldability and... Surface-treated steel sheet having improved weldability and...

C - Chemistry, Metallurgy

23

C

117/92

C23C 2/02 (2006.01) C25D 5/10 (2006.01) C25D 5/50 (2006.01)

Patent

CA 2036701

The zinc or zinc-alloy plated steel sheet having improved weldability comprises an extra low carbon steel sheet, an iron-carbon plated layer or a carbon-rich layer generated by diffusion of the iron-carbon plated layer on at least one major surface of the extra low carbon steel sheet, and a zinc or zinc-alloy plated layer on the iron- carbon plated layer or the carbon-rich layer. The zinc or zinc-alloy plated steel sheet having improved weldability and/or plating properties is produced by depositing on the steel sheet an iron-carbon plated layer having a carbon content of from 0.01% by weight to 10% by weight to a coating weight of from 0.01 g/m2 to 10 g/m2, optionally annealing the iron-carbon plated steel sheet, and depositing a zinc or zinc-alloy plated layer, preferably by galvanizing or galvannealing, on the annealed steel sheet.

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