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.
| Cu | 65.5 to 71 | |
| Ni | 29 to 33 | |
| Fe | 0 to 0.5 | |
| Mn | 0 to 0.3 | |
| C | 0 to 0.070 | |
| Pb | 0 to 0.050 | |
| Zn | 0 to 0.050 | |
| res. | 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