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UNS C72150 (CuNi44) Copper-Nickel

C72150 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. CuNi44 is the EN chemical designation for this material. C72150 is the UNS number.

It has the highest base cost among wrought copper-nickels. In addition, it has the lowest electrical conductivity and the highest melting temperature.

The graph bars on the material properties cards below compare C72150 copper-nickel to: wrought copper-nickels (top), all copper alloys (middle), and the entire database (bottom). A full bar means this is the highest value in the relevant set. A half-full bar means it's 50% of the highest, and so on.

Mechanical Properties

Brinell Hardness

99

Elastic (Young's, Tensile) Modulus

150 GPa 21 x 106 psi

Elongation at Break

29 %

Poisson's Ratio

0.33

Shear Modulus

55 GPa 8.0 x 106 psi

Shear Strength

320 MPa 46 x 103 psi

Tensile Strength: Ultimate (UTS)

490 MPa 70 x 103 psi

Tensile Strength: Yield (Proof)

210 MPa 30 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

600 °C 1110 °F

Melting Completion (Liquidus)

1210 °C 2210 °F

Melting Onset (Solidus)

1250 °C 2280 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

22 W/m-K 13 BTU/h-ft-°F

Thermal Expansion

14 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

3.5 % IACS

Electrical Conductivity: Equal Weight (Specific)

3.6 % IACS

Otherwise Unclassified Properties

Base Metal Price

45 % relative

Density

8.9 g/cm3 550 lb/ft3

Embodied Carbon

6.1 kg CO2/kg material

Embodied Energy

88 MJ/kg 38 x 103 BTU/lb

Embodied Water

270 L/kg 33 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

120 MJ/m3

Resilience: Unit (Modulus of Resilience)

150 kJ/m3

Stiffness to Weight: Axial

9.1 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

15 points

Strength to Weight: Bending

15 points

Thermal Diffusivity

6.0 mm2/s

Thermal Shock Resistance

18 points

Alloy Composition

Among wrought copper alloys, the composition of C72150 copper-nickel is notable for including silicon (Si) and manganese (Mn). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy. Manganese is used to improve strength without a proportional reduction in ductility.

Copper (Cu) 52.5 to 57
Nickel (Ni) 43 to 46
Silicon (Si) 0 to 0.5
Zinc (Zn) 0 to 0.2
Carbon (C) 0 to 0.1
Iron (Fe) 0 to 0.1
Manganese (Mn) 0 to 0.050
Lead (Pb) 0 to 0.050
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001