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
0.34
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
Density
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.
| Cu | 92.4 to 95.8 | |
| Al | 2.5 to 3.1 | |
| Si | 1.5 to 2.1 | |
| Co | 0.25 to 0.55 | |
| Zn | 0 to 0.8 | |
| Ni | 0 to 0.2 | |
| Fe | 0 to 0.2 | |
| Mn | 0 to 0.1 | |
| Pb | 0 to 0.050 | |
| res. | 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