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UNS C63800 Aluminum Bronze

C63800 bronze is a bronze formulated for primary forming into wrought products. It has a moderately low thermal conductivity and a moderately low electrical conductivity among wrought bronzes.

The properties of C63800 bronze include nine 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 C63800 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

110 GPa 17 x 106 psi

Elongation at Break

7.9 to 41 %

Poisson's Ratio


Rockwell B Hardness

94 to 110

Rockwell Superficial 30T Hardness

74 to 93

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

320 to 500 MPa 46 to 73 x 103 psi

Tensile Strength: Ultimate (UTS)

460 to 1010 MPa 67 to 150 x 103 psi

Thermal Properties

Latent Heat of Fusion

240 J/g

Maximum Temperature: Mechanical

200 °C 400 °F

Melting Completion (Liquidus)

1030 °C 1880 °F

Melting Onset (Solidus)

1000 °C 1830 °F

Specific Heat Capacity

410 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

40 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

10 % IACS

Electrical Conductivity: Equal Weight (Specific)

10 % IACS

Otherwise Unclassified Properties

Base Metal Price

30 % relative


8.6 g/cm3 540 lb/ft3

Embodied Carbon

2.8 kg CO2/kg material

Embodied Energy

45 MJ/kg 19 x 103 BTU/lb

Embodied Water

330 L/kg 39 gal/lb

Common Calculations

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

15 to 33 points

Strength to Weight: Bending

15 to 26 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

17 to 36 points

Alloy Composition

Among wrought copper alloys, the composition of C63800 bronze is notable for including cobalt (Co) and aluminum (Al). Cobalt is used to improve strength. Aluminum is used to add strength and oxidation resistance.

Copper (Cu)Cu 92.4 to 95.8
Aluminum (Al)Al 2.5 to 3.1
Silicon (Si)Si 1.5 to 2.1
Cobalt (Co)Co 0.25 to 0.55
Zinc (Zn)Zn 0 to 0.8
Nickel (Ni)Ni 0 to 0.2
Iron (Fe)Fe 0 to 0.2
Manganese (Mn)Mn 0 to 0.1
Lead (Pb)Pb 0 to 0.050
Residualsres. 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

ASTM B422: Standard Specification for Copper-Aluminum-Silicon-Cobalt Alloy, Copper-Nickel-Silicon-Magnesium Alloy, Copper-Nickel-Silicon Alloy, Copper-Nickel-Aluminum-Magnesium Alloy, and Copper- Nickel-Tin Alloy Sheet and Strip

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