MakeItFrom.com
Menu (ESC)

UNS C71580 (CuNi30) Copper-Nickel

C71580 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. CuNi30 is the EN chemical designation for this material. C71580 is the UNS number.

It has a moderately high base cost among wrought copper-nickels. In addition, it has a moderately high embodied energy and a moderately low electrical conductivity.

The graph bars on the material properties cards below compare C71580 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

75

Elastic (Young's, Tensile) Modulus

140 GPa 20 x 106 psi

Elongation at Break

40 %

Poisson's Ratio

0.33

Shear Modulus

51 GPa 7.5 x 106 psi

Shear Strength

230 MPa 33 x 103 psi

Tensile Strength: Ultimate (UTS)

330 MPa 48 x 103 psi

Tensile Strength: Yield (Proof)

110 MPa 17 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

260 °C 500 °F

Melting Completion (Liquidus)

1180 °C 2150 °F

Melting Onset (Solidus)

1120 °C 2040 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

39 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

4.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

4.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

41 % relative

Density

8.9 g/cm3 560 lb/ft3

Embodied Carbon

5.1 kg CO2/kg material

Embodied Energy

74 MJ/kg 32 x 103 BTU/lb

Embodied Water

280 L/kg 34 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

100 MJ/m3

Resilience: Unit (Modulus of Resilience)

47 kJ/m3

Stiffness to Weight: Axial

8.5 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

10 points

Strength to Weight: Bending

12 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

11 points

Alloy Composition

Among wrought copper alloys, the composition of C71580 copper-nickel is notable for including manganese (Mn) and nickel (Ni). Manganese is used to improve strength without a proportional reduction in ductility. Nickel is used to improve strength (particularly at elevated temperatures) and corrosion resistance.

Copper (Cu) 65.5 to 71
Nickel (Ni) 29 to 33
Iron (Fe) 0 to 0.5
Manganese (Mn) 0 to 0.3
Carbon (C) 0 to 0.070
Lead (Pb) 0 to 0.050
Zinc (Zn) 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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015