Differentially coated galvanized steel strip and method and...

Details Differentially coated galvanized steel strip and method and... Differentially coated galvanized steel strip and method and...

B - Operations, Transporting

32

B

117/115

B32B 15/18 (2006.01)

Patent

CA 1247470

ABSTRACT A differentially coated, galvanized steel strip is produced by hot dip coating both sides of a steel strip and adjusting the weight of coating metal on opposite sides of the strip to produce a light coated side and a heavy coated side. The strip is then precooled to fully solidify the heavy coated side following which the galvanized strip is subjected to a treating step in which simultaneously the light coated side is heated and the heavy coated side is cooled. This fully transforms the light coated side to iron-zinc alloy throughout while only partially transform- ing an inner layer on the heavy coated side to iron-zinc alloy. The outer layer on the heavy coated side consists entirely of coating metal, and there are no intermittent bleed- throughs of iron-zinc alloy to the outer surface of the heavy coated side.

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