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Copper Nickel Pipe | 90/10 & 70/30 CuNi Pipes for Shipbuilding

Copper Nickel Pipe

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Copper nickel pipe, also known as cupronickel pipe or CuNi pipe, is specially designed for seawater service and marine environments. Copper nickel alloys contain copper, nickel, iron and manganese, which provide excellent corrosion resistance and good mechanical performance in seawater applications.

Compared with carbon steel and some stainless steels, copper nickel pipe performs well in chloride-containing seawater environments. It can form a stable protective surface film in seawater, helping to reduce corrosion, erosion and marine organism attachment. For this reason, CuNi pipe is commonly used in shipbuilding, offshore engineering, desalination systems and heat exchanger equipment.With excellent resistance to seawater corrosion, erosion corrosion and marine biofouling, copper nickel pipe is one of the preferred materials for marine piping applications.

We supply 90/10 copper nickel pipes and 70/30 copper nickel pipes in grades such as C70600, C71500, CuNi10Fe1Mn and CuNi30Mn1Fe. Seamless pipes, welded pipes, heat exchanger tubes and matching copper nickel pipe fittings are available according to ASTM, DIN, EN, EEMUA and customer project requirements.

Available Copper Nickel Pipe Products

We supply a wide range of copper nickel pipes and tubes for marine and offshore piping systems.

Product	Description
90/10 Copper Nickel Pipe	Commonly used CuNi pipe for marine seawater systems, grade C70600 / CuNi10Fe1Mn
70/30 Copper Nickel Pipe	Higher nickel content, better strength and erosion resistance, grade C71500 / CuNi30Mn1Fe
Copper Nickel Seamless Pipe	Suitable for pressure piping, heat exchangers and critical marine systems
Copper Nickel Welded Pipe	Suitable for large diameter seawater piping systems
Copper Nickel Heat Exchanger Tube	Used in condensers, coolers, evaporators and desalination equipment

Common Material Grades

Alloy	UNS Grade	European / Common Grade	Typical Application
90/10 Copper Nickel	C70600	CuNi10Fe1Mn	General marine seawater piping
70/30 Copper Nickel	C71500	CuNi30Mn1Fe	High strength and demanding seawater service
90/10 CuNi	C70620 / equivalent	Project specified grade	Shipbuilding and offshore projects
70/30 CuNi	C71520 / equivalent	Project specified grade	Severe marine and heat exchanger applications

90/10 Copper Nickel Pipe vs 70/30 Copper Nickel Pipe

90/10 copper nickel pipe, usually supplied as C70600 or CuNi10Fe1Mn, contains approximately 90% copper and 10% nickel. It offers excellent seawater corrosion resistance, good weldability and cost-effective performance. It is widely used in shipbuilding and general marine piping systems.

70/30 copper nickel pipe, usually supplied as C71500 or CuNi30Mn1Fe, contains approximately 70% copper and 30% nickel. Compared with 90/10 CuNi, it provides higher strength and better resistance to erosion corrosion, making it suitable for higher velocity seawater systems and more demanding marine environments.

Standards and Specifications

Our marine copper nickel pipes can be supplied according to the following standards or customer specifications:

ASTM B466
ASTM B467
ASTM B111
ASME SB466
DIN 86019
DIN 86090
EEMUA 144
EN 12449
EN 12451
GB/T standards
Customer drawings and project specifications

Specifications

Item	Supply Range
Material	C70600, C71500, CuNi10Fe1Mn, CuNi30Mn1Fe
Product Type	Seamless pipe, welded pipe, heat exchanger tube
Outside Diameter	According to standard or customer requirement
Wall Thickness	According to standard, pressure rating or drawing
Length	Random length, fixed length or cut-to-length
Pipe End	Plain end, beveled end, expanded end, flanged end
Surface	Cleaned, pickled or bright finish
Processing	Cutting, beveling, bending, flanging, pipe spool fabrication
Packaging	Wooden case, wooden pallet, bundle packing, export seaworthy packing