Coating processes – With post-treatment of coating or coating material – Gas jet or blast mechanically treats coating
Patent
1984-01-20
1985-04-23
Silverberg, Sam
Coating processes
With post-treatment of coating or coating material
Gas jet or blast mechanically treats coating
4273839, 4273746, 4273743, 4273744, 427433, C23C 102
Patent
active
045130337
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: 3148080 (1960-05-01), Mayhew
patent: 3782909 (1974-01-01), Cleary
patent: 4120997 (1978-10-01), Franks
patent: 4171392 (1979-10-01), Sievert
patent: 4171394 (1979-10-01), Patil et al.
Johnson Donald F.
Patil Ram S.
Quasney John T.
Inland Steel Company
Silverberg Sam
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