Differentially coated galvanized steel strip and method and appa

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

1984-11-16

1985-07-16

Silverberg, Sam

Coating apparatus

With heat exchange, drying, or non-coating gas or vapor...

To remove or spread applied coating by gas blast

118 67, 118 69, C23C 102

Patent

active

045289352

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 transforming 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.

REFERENCES:
patent: 4171394 (1979-10-01), Patil

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