Pipes and tubular conduits – Distinct layers – Bonded to each other
Patent
1991-11-01
1994-01-11
Bryant, II, James E.
Pipes and tubular conduits
Distinct layers
Bonded to each other
138140, 138145, 138171, 138DIG6, 138142, F16L 900, F16L 914
Patent
active
052772284
ABSTRACT:
Disclosed are a welded pipe with an excellent corrosion resistance, having two plate layers on the inner surface thereof, and a method of manufacturing it. The inner surface is coated with the plate layers even on the bead part and other steel foundation-exposed parts. A first plate layer of at least one of Ni, Co and Ni- or Co-base alloys is formed on at least one surface of a steel strip, then a second plate layer made of a metal or alloy having a lower melting point than the metal or alloy of forming the first plate layer is formed over the first plate layer. The thus plated steel strip is formed into a pipe and then heat-treated to give a welded pipe having no exposed steel foundation. The welded pipe has excellent corrosion resistance and workability.
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Bryant, II James E.
Usui Kokusai Sangyo Kaisha Limited
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