UNS C70700 (CuNi10) Copper-Nickel
C70700 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. Cited properties are appropriate for the annealed condition. CuNi10 is the EN chemical designation for this material. C70700 is the UNS number.
It has a moderately low tensile strength among the wrought copper-nickels in the database.
The graph bars on the material properties cards below compare C70700 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
73
Elastic (Young's, Tensile) Modulus
120 GPa 18 x 106 psi
Elongation at Break
39 %
Poisson's Ratio
0.34
Shear Modulus
46 GPa 6.7 x 106 psi
Shear Strength
220 MPa 32 x 103 psi
Tensile Strength: Ultimate (UTS)
320 MPa 47 x 103 psi
Tensile Strength: Yield (Proof)
110 MPa 16 x 103 psi
Thermal Properties
Latent Heat of Fusion
220 J/g
Maximum Temperature: Mechanical
220 °C 430 °F
Melting Completion (Liquidus)
1120 °C 2050 °F
Melting Onset (Solidus)
1060 °C 1950 °F
Specific Heat Capacity
390 J/kg-K 0.093 BTU/lb-°F
Thermal Conductivity
59 W/m-K 34 BTU/h-ft-°F
Thermal Expansion
16 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
12 % IACS
Otherwise Unclassified Properties
Base Metal Price
34 % relative
Density
8.9 g/cm3 560 lb/ft3
Embodied Carbon
3.4 kg CO2/kg material
Embodied Energy
52 MJ/kg 22 x 103 BTU/lb
Embodied Water
300 L/kg 36 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
100 MJ/m3
Resilience: Unit (Modulus of Resilience)
51 kJ/m3
Stiffness to Weight: Axial
7.6 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
10 points
Strength to Weight: Bending
12 points
Thermal Diffusivity
17 mm2/s
Thermal Shock Resistance
12 points
Alloy Composition
Among wrought copper alloys, the composition of C70700 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 | 88.5 to 90.5 | |
| Ni | 9.5 to 10.5 | |
| Mn | 0 to 0.5 | |
| Fe | 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