Corcerning copper or copper-alloy tubes for pipes used in...

Details Corcerning copper or copper-alloy tubes for pipes used in... Corcerning copper or copper-alloy tubes for pipes used in...

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F16L 9/00 (2006.01) B21C 37/083 (2006.01) C22F 1/08 (2006.01) C23G 5/00 (2006.01) F28F 19/00 (2006.01) F28F 21/08 (2006.01)

Patent

CA 1145273

ABSTRACT TITLE IMPROVEMENTS CONCERNING COPPER OR COPPER-ALLOY TUBES FOR PIPES USED IN SANITARY, CONDENSER AND OTHER INSTALLATIONS A process of making tubes of copper or copper-alloy for resistance to pin-hole corrosion caused by water or water carrying chemically aggressive constituents. The process comprises successive steps of an oxidation heat treatment to a strip of copper or copper-alloy to achieve a carbon content reduction to a predetermined value, followed by surface cleaning treatment to remove loose, non-adhering deposits and finally welding the strip to make a tube with the cleaned surface forming the in- terior of the tube. The tubes have particular application for use in pipework installations of condensers and heat exchangers.

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