Cupro Nickel
Cupro nickel seamless pipe, condenser tube, plate and fittings in 90/10 (C70600), 70/30 (C71500) and the desalination variant 66/30/2/2 (C71640). The copper-nickel film resists seawater corrosion while the copper content stops barnacle and mussel settlement, which is why marine, offshore, naval and desalination systems specify it over stainless steel for seawater duty.
[ 01 ] Grades in this family
Cupro Nickel
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Cupro Nickel 90/10 Seamless Pipes
Mill indentThe default seawater alloy. 90% copper with 10% nickel and a controlled iron addition builds a protective cuprous oxide film in seawater, and the inherent copper toxicity stops macrofouling — barnacles and mussels do not settle, so cooling lines stay clean without chlorination. Specified for ship and platform seawater systems, firewater ring mains and condenser tubing where the velocity stays below about 3.5 m/s.
Cupro Nickel 70/30 Seamless Pipes
Mill indentThe higher-duty cupro nickel. Tripling the nickel to 30% raises strength, erosion-corrosion resistance and the allowable seawater velocity to around 4.5 m/s, and lifts the service temperature well above 90/10. It is the grade for pump and valve-adjacent piping, hot brine and MSF desalination heat recovery, and any line where turbulence or sand loading would strip the film off 90/10.
Cupro Nickel 66/30/2/2 (C71640)
Project supplyThe desalination variant of 70/30. Raising iron and manganese to about 2% each stabilises the protective film under high velocity, sand-laden and partly deaerated brine, which is exactly the duty inside MSF evaporator heat recovery and reject sections. Where 70/30 tubes thin at the inlet ends, C71640 holds.
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