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UNS C71520 (ERCuNi) Copper-Nickel

C71520 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products. ERCuNi is the AWS designation for this material. C71520 is the UNS number.

It can have the highest ductility among wrought copper-nickels. In addition, it has a moderately high base cost and a moderately high embodied energy.

The properties of C71520 copper-nickel include five common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C71520 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

140 GPa 20 x 106 psi

Elongation at Break

10 to 45 %

Poisson's Ratio

0.33

Rockwell B Hardness

35 to 86

Shear Modulus

51 GPa 7.5 x 106 psi

Shear Strength

250 to 340 MPa 36 to 50 x 103 psi

Tensile Strength: Ultimate (UTS)

370 to 570 MPa 54 to 83 x 103 psi

Tensile Strength: Yield (Proof)

140 to 430 MPa 20 to 63 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

260 °C 500 °F

Melting Completion (Liquidus)

1170 °C 2150 °F

Melting Onset (Solidus)

1120 °C 2040 °F

Specific Heat Capacity

400 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

32 W/m-K 19 BTU/h-ft-°F

Thermal Expansion

15 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

5.7 % IACS

Electrical Conductivity: Equal Weight (Specific)

5.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

40 % relative

Density

8.9 g/cm3 560 lb/ft3

Embodied Carbon

5.0 kg CO2/kg material

Embodied Energy

73 MJ/kg 31 x 103 BTU/lb

Embodied Water

280 L/kg 34 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

54 to 130 MJ/m3

Resilience: Unit (Modulus of Resilience)

67 to 680 kJ/m3

Stiffness to Weight: Axial

8.6 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

12 to 18 points

Strength to Weight: Bending

13 to 17 points

Thermal Diffusivity

8.9 mm2/s

Thermal Shock Resistance

12 to 19 points

Alloy Composition

Among wrought copper alloys, the composition of C71520 copper-nickel is notable for including sulfur (S). Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.

Copper (Cu) 65 to 71.6
Nickel (Ni) 28 to 33
Iron (Fe) 0.4 to 1.0
Manganese (Mn) 0 to 1.0
Zinc (Zn) 0 to 0.5
Phosphorus (P) 0 to 0.2
Carbon (C) 0 to 0.050
Sulfur (S) 0 to 0.020
Lead (Pb) 0 to 0.020
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B151: Standard Specification for Copper-Nickel-Zinc Alloy (Nickel Silver) and Copper-Nickel Rod and Bar

ASTM B122: Standard Specification for Copper-Nickel-Tin Alloy, Copper-Nickel-Zinc Alloy (Nickel Silver), and Copper-Nickel Alloy Plate, Sheet, Strip, and Rolled Bar

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001