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UNS C63020 Aluminum-Nickel Bronze

C63020 bronze is a bronze formulated for primary forming into wrought products. Cited properties are appropriate for the TQ30 (quench hardened and tempered) condition. C63020 is the UNS number for this material. Additionally, the EN chemical designation is CuAl11Ni5Fe5.

It has a fairly high tensile strength among wrought bronzes. In addition, it has a fairly high heat capacity and a fairly high embodied energy.

The graph bars on the material properties cards below compare C63020 bronze to: wrought bronzes (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

6.8 %

Poisson's Ratio


Shear Modulus

44 GPa 6.4 x 106 psi

Shear Strength

600 MPa 86 x 103 psi

Tensile Strength: Ultimate (UTS)

1020 MPa 150 x 103 psi

Tensile Strength: Yield (Proof)

740 MPa 110 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

230 °C 450 °F

Melting Completion (Liquidus)

1070 °C 1970 °F

Melting Onset (Solidus)

1020 °C 1870 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Otherwise Unclassified Properties

Base Metal Price

29 % relative


8.2 g/cm3 510 lb/ft3

Embodied Carbon

3.6 kg CO2/kg material

Embodied Energy

58 MJ/kg 25 x 103 BTU/lb

Embodied Water

390 L/kg 46 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

63 MJ/m3

Resilience: Unit (Modulus of Resilience)

2320 kJ/m3

Stiffness to Weight: Axial

8.0 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

34 points

Strength to Weight: Bending

27 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

35 points

Alloy Composition

Among wrought copper alloys, the composition of C63020 bronze is notable for including chromium (Cr) and cobalt (Co). Chromium additions permits certain types of heat treatment to improve mechanical strength. Cobalt is used to improve strength.

Copper (Cu)Cu 74.7 to 81.8
Aluminum (Al)Al 10 to 11
Nickel (Ni)Ni 4.2 to 6.0
Iron (Fe)Fe 4.0 to 5.5
Manganese (Mn)Mn 0 to 1.5
Zinc (Zn)Zn 0 to 0.3
Tin (Sn)Sn 0 to 0.25
Cobalt (Co)Co 0 to 0.2
Chromium (Cr)Cr 0 to 0.050
Lead (Pb)Pb 0 to 0.030
Residualsres. 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B150: Standard Specification for Aluminum Bronze Rod, Bar, and Shapes

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