UNS C70400 Copper-Nickel
C70400 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. It can have a moderately low tensile strength and has a moderately low embodied energy among wrought copper-nickels.
The properties of C70400 copper-nickel include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C70400 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
Elastic (Young's, Tensile) Modulus
120 GPa 18 x 106 psi
Poisson's Ratio
0.34
Shear Modulus
45 GPa 6.6 x 106 psi
Tensile Strength: Ultimate (UTS)
300 to 310 MPa 43 to 45 x 103 psi
Tensile Strength: Yield (Proof)
95 to 230 MPa 14 to 33 x 103 psi
Thermal Properties
Latent Heat of Fusion
210 J/g
Maximum Temperature: Mechanical
210 °C 410 °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
64 W/m-K 37 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
14 % IACS
Electrical Conductivity: Equal Weight (Specific)
14 % IACS
Otherwise Unclassified Properties
Base Metal Price
32 % relative
Density
8.9 g/cm3 560 lb/ft3
Embodied Carbon
3.0 kg CO2/kg material
Embodied Energy
47 MJ/kg 20 x 103 BTU/lb
Embodied Water
300 L/kg 36 gal/lb
Common Calculations
Resilience: Unit (Modulus of Resilience)
38 to 220 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
9.3 to 9.8 points
Strength to Weight: Bending
11 to 12 points
Thermal Diffusivity
18 mm2/s
Thermal Shock Resistance
10 to 11 points
Alloy Composition
Among wrought copper alloys, the composition of C70400 copper-nickel is notable for containing a comparatively high amount of iron (Fe) and including manganese (Mn). Iron is used to increase strength inexpensively. Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 89.8 to 93.6 | |
| Ni | 4.8 to 6.2 | |
| Fe | 1.3 to 1.7 | |
| Mn | 0.3 to 0.8 | |
| Zn | 0 to 1.0 | |
| Pb | 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
ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001