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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


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


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.

Copper (Cu)Cu 78.1 to 84.2
Nickel (Ni)Ni 15 to 18
Iron (Fe)Fe 0.5 to 1.0
Manganese (Mn)Mn 0 to 1.0
Chromium (Cr)Cr 0.3 to 0.7
Zinc (Zn)Zn 0 to 1.0
Lead (Pb)Pb 0 to 0.050
Residualsres. 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