Cupro-nickel tube is a copper nickel alloy, mainly containing copper, nickel and a small amount of iron and manganese to improve corrosion resistance in high velocity water, including sea water. Cu/Ni tube is endowed with excellent corrosion resistance, high coefficient of heat transfer, good machnical property as well as that of technological performance, weldability and anti-fouling property against sea microorganism, therefore, widely applied to sea water desalination equipment, offshore thermal power plant, ship building and repairing, oil exploitation platform and other auxiliary system aiming to achieving heat transfer and pipe installation, especially great consumed as heat exchanger tube in evaporating and condensing process in sea water desalination and hydraulic power station.