UNS C62300 Aluminum Bronze
C62300 bronze is a bronze formulated for primary forming into wrought products. C62300 is the UNS number for this material. Additionally, the common industry name is 9% Aluminum Bronze. It has a moderately high heat capacity and a moderately high melting temperature among wrought bronzes.
The properties of C62300 bronze include three 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 C62300 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 16 x 106 psi
Elongation at Break
18 to 32 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
360 to 390 MPa 53 to 57 x 103 psi
Tensile Strength: Ultimate (UTS)
570 to 630 MPa 82 to 92 x 103 psi
Tensile Strength: Yield (Proof)
230 to 310 MPa 34 to 46 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
220 °C 430 °F
Melting Completion (Liquidus)
1050 °C 1910 °F
Melting Onset (Solidus)
1040 °C 1910 °F
Specific Heat Capacity
440 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
54 W/m-K 31 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
12 % IACS
Electrical Conductivity: Equal Weight (Specific)
13 % IACS
Otherwise Unclassified Properties
Base Metal Price
28 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
52 MJ/kg 22 x 103 BTU/lb
Embodied Water
390 L/kg 46 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
95 to 150 MJ/m3
Resilience: Unit (Modulus of Resilience)
240 to 430 kJ/m3
Stiffness to Weight: Axial
7.6 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
19 to 21 points
Strength to Weight: Bending
18 to 20 points
Thermal Diffusivity
15 mm2/s
Thermal Shock Resistance
20 to 22 points
Alloy Composition
Among wrought copper alloys, the composition of C62300 bronze is notable for including aluminum (Al) and silicon (Si). Aluminum is used to add strength and oxidation resistance. Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.
| Cu | 83.2 to 89.5 | |
| Al | 8.5 to 10 | |
| Fe | 2.0 to 4.0 | |
| Ni | 0 to 1.0 | |
| Sn | 0 to 0.6 | |
| Mn | 0 to 0.5 | |
| Si | 0 to 0.25 | |
| res. | 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
ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes
ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)
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