Copper/Nickel Alloy Tube (Cu70/Ni30)

Copper/Nickel Alloy Tube (Cu70/Ni30) offers exceptional corrosion resistance, mechanical durability, and thermal conductivity, making it indispensable for marine, chemical, and heat transfer applications. The 70/30 composition ensures superior resistance to seawater corrosion and stress corrosion cracking, while maintaining high strength and ductility. This alloy is widely employed in seawater cooling systems, desalination plants, and heat exchangers where prolonged exposure to saline or chemically aggressive environments occurs. Specific uses include condensers in offshore oil and gas platforms, seawater intake piping in naval vessels, and evaporator tubing in large-scale desalination units. In research, Cu70/Ni30 tubes are essential for developing optimized marine-grade alloys, improving thermal efficiency in heat exchange systems, and exploring anti-biofouling surface treatments. The synergy of resilience, heat transfer efficiency, and environmental resistance positions it as a key material in both industrial infrastructure and advanced engineering research.

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Tolerance

Properties

Reference & Citations

Health hazard/Hazardous to the ozone layer

Serious health hazard

each

Tolerances

Tube

Outside Diameter	=<2mm	±0.05mm
Outside Diameter	2mm - 5mm	±0.1mm
Outside Diameter	>5mm	±5%
Wall Thickness		±10%

Material Properties for Alloys

Mechanical Properties

Element	Value
Elongation at break( % )	<45
Tensile strength( MPa )	410-420

Electrical Properties

Element	Value
Electrical resistivity( µOhmcm )	37.4
Temperature coefficient( K⁻¹ )	-

Thermal Properties

Element	Value
Melting point( C )	1171
Specific heat( J K⁻¹ kg⁻¹ )	377@23°C
Thermal conductivity( W m⁻¹ K⁻¹ )	29.4
Coefficient of thermal expansion( x10⁻⁶ K⁻¹ )	16.2@20-300°C