UNS C70620 Copper-Nickel
C70620 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products.
The properties of C70620 copper-nickel include six 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 C70620 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
Rockwell B Hardness
65 to 87
Rockwell Superficial 30T Hardness
61 to 75
Shear Modulus
46 GPa 6.7 x 106 psi
Tensile Strength: Ultimate (UTS)
300 to 570 MPa 43 to 83 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 0.094 BTU/lb-°F
Thermal Conductivity
49 W/m-K 28 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
33 % relative
Density
8.9 g/cm3 560 lb/ft3
Embodied Carbon
3.4 kg CO2/kg material
Embodied Energy
51 MJ/kg 22 x 103 BTU/lb
Embodied Water
300 L/kg 35 gal/lb
Common Calculations
Stiffness to Weight: Axial
7.7 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
9.3 to 18 points
Strength to Weight: Bending
11 to 17 points
Thermal Diffusivity
14 mm2/s
Thermal Shock Resistance
10 to 20 points
Alloy Composition
Among wrought copper alloys, the composition of C70620 copper-nickel is notable for including sulfur (S). Sulfur is used to improve machinability at the cost of a decrease in electrical conductivity.
| Cu | 86.5 to 90 | |
| Ni | 9.0 to 11 | |
| Fe | 1.0 to 1.8 | |
| Mn | 0 to 1.0 | |
| Zn | 0 to 0.5 | |
| P | 0 to 0.2 | |
| C | 0 to 0.050 | |
| S | 0 to 0.020 | |
| Pb | 0 to 0.020 | |
| res. | 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)
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015