Copper Nickel Pipe is a metal pipe made up of copper nickel alloy. The copper nickel alloys contain copper and nickel and in addition some iron and manganese for strength. There are different grades in the cupronickel material. There are pure copper variations and there are alloyed ones. The Class 200 Cuni Pipes are a 90/10 copper grade. It is highly electrically conductive and thermally conductive. It is resistant to ammonia in seawater and is resistant to acidic conditions. The Cupro Nickel Seamless Pipes are made through cold drawing procedures and it has higher dimensional precision. The copper material is highly ductile. It could be bent without the need for special tools.

Copper in its pure form is not strong enough like the other alloy metals. Therefore the Copper Nickel Alloy Pipes includes material such as iron and manganese for additional strength. There are different pressure classes of copper that are used in calculation for the need of the correct grade. The Schedule 40 Copper Nickel Pipes can withstand mild pressures whereas the Schedule 80 Copper Nickel Pipes can withstand high pressure environments.

Technical Data

Physical Properties of Copper Nickel Condenser Tubes

Property of copper nickel pipe	Metric in °C	Imperial in °F
Melting Point	11,500°C	21,000°F
Melting Point	11,000°C	20,100°F

Density	8.94 gm/cm³ @ 20°C	0.323 lb/in³ @ 68°F
Specific Gravity	8.94	8.94

Coefficient of Thermal Expansion	17.1 x 10 -6 / °C (20-300°C)	9.5 x 10 -5 / °F (68-392°F)
Themal Conductivity	40 W/m. °K @ 20°C	23 BTU/ft³/ft/hr/°F @ 68°F
Thermal Capacity	380 J/kg. °K @ 20°C	0.09 BTU/lb/°F @ 68°F

Electrical Conductivity	5.26 microhm?¹.cm?¹ @ 20°C	9.1% IACS
Electrical Resistivity	0.190 microhm.cm @ 20°C	130 ohms (circ mil/ft) @ 68°F

Modulus of Elasticity	140 GPa @ 20°C	20 x 10 6 psi @ 68°F
Modulus of Rigidity	52 GPa @ 20°C	7.5 x 10 6 psi @ 68°F

Copper Nickel Alloy Pipe Chemical Composition Chart

Grade	Cu	Mn	Pb	Ni	Fe	Zn
Cu-Ni 90-10	88.6 min	1.00 max	0.5 max	9-11 max	1.8 max	1.00 max
Cu-Ni 70-30	65.0 min	1.00 max	0.5 max	29-33 max	0.4-1.0	1.00 max

Mechanical Analysis of ASTM B466 Copper Nickel Tube

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Element	Density	Melting Point	Tensile Strength	Yield Strength (0.2%Offset)	Elongation
Cupro Nickel 90-10	0.323 lb/in3 at 68 F	2260 F	50000 psi	90-1000 psi	30 %
Cupro Nickel 70-30	0.323 lb/in3 at 68 F	2260 F	50000 psi	90-1000 psi	30 %

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