Metal working – Method of mechanical manufacture – Combined manufacture including applying or shaping of fluent...
Patent
1980-04-04
1982-11-16
Moon, Charlie T.
Metal working
Method of mechanical manufacture
Combined manufacture including applying or shaping of fluent...
29 33Q, 72372, 72 46, 72 47, B22D 11126, B21B 4500, B21C 2324
Patent
active
043588875
ABSTRACT:
A method and apparatus for galvanized pipe and other formed sections which sometimes include reentrant angles and strapping. The pipe and other sections are sized and hot dipped in a bath of molten zinc at a temperature of about 850.degree. F. (450.degree. C.) and then controlled for thickness with an air knife. The molten zinc is cooled at a rate of 20.degree.-70.degree./second by an air blast or an air amplifier to solidify the zinc coating before the formation of more than 0.00008" to 0.00018" of intermetallic compound to form a layer of zinc from 0.0004" to 0.0008" in thickness. The zinc is water quenched without the formation of spangles and plastic coated with a layer of polyesters, vinyl alkyds or fluorocarbons, from 0.002" to 0.006", resulting in a coated steel that does not develop extensive rust corrosion in less than 1000 hours in a neutral salt spray. The formed product meets ASTM A-525 specifications and is designated G-30 or G-60 according to the thickness of the zinc layer.
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Moon Charlie T.
Rising V. K.
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