Method of treating ferrous strand for coating with aluminum-zinc

Details Method of treating ferrous strand for coating with aluminum-zinc Method of treating ferrous strand for coating with aluminum-zinc

1976-05-27

1977-10-11

Kendall, Ralph S.

Coating processes

With pretreatment of the base

Heating or drying pretreatment

427321, 427432, 427433, 427434D, C23C 102

Patent

active

040536637

ABSTRACT:
This invention relates to a method of hot-dip coating a ferrous strand. The strand is passed through a furnace in which the strand is heated, passed through a second furnace in which the strand is subjected to a reducing atmosphere and then passed through a protective hood and into the molten bath of aluminum-zinc alloy. A preheated reducing gas is introduced into the protective hood so as to sweep across and cover the surface of the molten bath within such hood prior to passing upwardly through it and the second furnace countercurrent to the movement of the strand. The preheated reducing gas has a temperature of at least 750.degree. F, a dew point no greater then 0.degree. F and is composed of at least 20% by volume of hydrogen, balance essentially nitrogen.

REFERENCES:
patent: 2110893 (1938-03-01), Sendzimir
patent: 2570906 (1951-10-01), Alferieff
patent: 3027269 (1962-03-01), Teshima et al.
patent: 3051587 (1962-08-01), Coburn
patent: 3227577 (1966-01-01), Baessler et al.
patent: 3343930 (1967-09-01), Borzillo et al.
patent: 3726705 (1973-04-01), Carter et al.
patent: 3728144 (1973-04-01), Van Poucke

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