UNS C72200 Chromium-Bearing Copper-Nickel
C72200 copper-nickel is a copper-nickel alloy formulated for primary forming into wrought products.
The properties of C72200 copper-nickel include eight 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 C72200 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
130 GPa 19 x 106 psi
Poisson's Ratio
0.33
Rockwell B Hardness
71 to 86
Rockwell Superficial 30T Hardness
64 to 75
Shear Modulus
48 GPa 7.0 x 106 psi
Tensile Strength: Ultimate (UTS)
350 to 580 MPa 50 to 84 x 103 psi
Thermal Properties
Latent Heat of Fusion
220 J/g
Maximum Temperature: Mechanical
230 °C 450 °F
Melting Completion (Liquidus)
1180 °C 2150 °F
Melting Onset (Solidus)
1120 °C 2050 °F
Specific Heat Capacity
400 J/kg-K 0.095 BTU/lb-°F
Thermal Conductivity
34 W/m-K 20 BTU/h-ft-°F
Thermal Expansion
16 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
6.5 % IACS
Electrical Conductivity: Equal Weight (Specific)
6.6 % IACS
Otherwise Unclassified Properties
Base Metal Price
36 % relative
Density
8.9 g/cm3 560 lb/ft3
Embodied Carbon
3.9 kg CO2/kg material
Embodied Energy
59 MJ/kg 25 x 103 BTU/lb
Embodied Water
300 L/kg 35 gal/lb
Common Calculations
Stiffness to Weight: Axial
8.0 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
11 to 18 points
Strength to Weight: Bending
12 to 17 points
Thermal Diffusivity
9.6 mm2/s
Thermal Shock Resistance
12 to 20 points
Alloy Composition
Among wrought copper alloys, the composition of C72200 copper-nickel is notable for including chromium (Cr). Chromium additions permits certain types of heat treatment to improve mechanical strength.
| Cu | 78.1 to 84.2 | |
| Ni | 15 to 18 | |
| Fe | 0.5 to 1.0 | |
| Mn | 0 to 1.0 | |
| Cr | 0.3 to 0.7 | |
| Zn | 0 to 1.0 | |
| Pb | 0 to 0.050 | |
| res. | 0 to 0.2 |
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
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
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