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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.

Copper (Cu) 88.5 to 90.5
Nickel (Ni) 9.5 to 10.5
Manganese (Mn) 0 to 0.5
Iron (Fe) 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