UNS C72700 Tin-Bearing Copper-Nickel
C72700 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products.
The properties of C72700 copper-nickel include four 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 C72700 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 17 x 106 psi
Elongation at Break
4.0 to 36 %
Poisson's Ratio
0.34
Shear Modulus
44 GPa 6.4 x 106 psi
Shear Strength
310 to 620 MPa 44 to 89 x 103 psi
Tensile Strength: Ultimate (UTS)
460 to 1070 MPa 66 to 150 x 103 psi
Tensile Strength: Yield (Proof)
580 to 1060 MPa 84 to 150 x 103 psi
Thermal Properties
Latent Heat of Fusion
210 J/g
Maximum Temperature: Mechanical
200 °C 390 °F
Melting Completion (Liquidus)
1100 °C 2010 °F
Melting Onset (Solidus)
930 °C 1700 °F
Specific Heat Capacity
380 J/kg-K 0.091 BTU/lb-°F
Thermal Conductivity
54 W/m-K 31 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
11 % IACS
Otherwise Unclassified Properties
Base Metal Price
36 % relative
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
4.0 kg CO2/kg material
Embodied Energy
62 MJ/kg 27 x 103 BTU/lb
Embodied Water
350 L/kg 42 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
20 to 380 MJ/m3
Resilience: Unit (Modulus of Resilience)
1420 to 4770 kJ/m3
Stiffness to Weight: Axial
7.4 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
14 to 34 points
Strength to Weight: Bending
15 to 26 points
Thermal Diffusivity
16 mm2/s
Thermal Shock Resistance
16 to 38 points
Alloy Composition
Among wrought copper alloys, the composition of C72700 copper-nickel is notable for including magnesium (Mg). Magnesium is used to improve strain hardenability. This increases strength but reduces the ability to form the alloy into complex shapes.
| Cu | 82.1 to 86 | |
| Ni | 8.5 to 9.5 | |
| Sn | 5.5 to 6.5 | |
| Fe | 0 to 0.5 | |
| Zn | 0 to 0.5 | |
| Mn | 0.050 to 0.3 | |
| Mg | 0 to 0.15 | |
| Nb | 0 to 0.1 | |
| Pb | 0 to 0.020 | |
| res. | 0 to 0.3 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015