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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


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


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.

Copper (Cu)Cu 89.8 to 93.6
Nickel (Ni)Ni 4.8 to 6.2
Iron (Fe)Fe 1.3 to 1.7
Manganese (Mn)Mn 0.3 to 0.8
Zinc (Zn)Zn 0 to 1.0
Lead (Pb)Pb 0 to 0.050
Residualsres. 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