Of copper-nickel base alloys (cupro-nickel) or

74.11 Copper tubes and pipes 741 1.10 - Of refined copper - Of copper alloys : 741 1.21 - - Of copper-zinc base alloys (brass) 7411.22 - - Of copper-nickel base alloys (cupro-nickel) or copper-nickel-zinc base 7411.29 - - Other alloys (nickel silver) Chapter Note 1 (h) defines tubes and pipes. The Explanatory Notes to headin s 73.04 to 73.06 apply, mutatis rnutandis, as regards the scope of the heading and the methods o manufacture of the goods. f Most cop er tubes and pipes are seamless but may sometimes be made by brazing or welding together %e edges of stnp or rocesses. The seamless tubes and pipes are usually to form a tube blank which is hot-rolled or drawn produced b piercing +d throu h a &e to the finished size. or some purposes the tubes and pipes may be extruded to their ml size without drawing. K Cop er tubes and pipes have many industrial a plications (e.g, in cookin , heating, cooling, dist~ling, refining or evaporatin apparatus) an are used in bulldings for fornestic or general water or gas supplies. Copper a loy condenser tubes are widely em loyed in ships and power stations because of their strong resistance to corrosion, particularly sa t water. S f B The heading does not cover : (a) Hollow profiles including finned or gilled tubes and pipes obtained by extrusion (heading 74.07). (b) Tube or pipe fittings (heading 74.12). (c) Tubes and pipes to which fins or gills have been attached, e.g., by welding (generally heading 74.19). (d) Flexible tubing (heading 83.07). (e) Tubes and ipes made up into identifiable articles of ather Chapters, e.g., machinery parts (section X V ~ .