UNS C62400 Aluminum Bronze
C62400 bronze is a bronze formulated for primary forming into wrought products. C62400 is the UNS number for this material. Additionally, the EN chemical designation is CuAl11Fe3.
It has a moderately high heat capacity among wrought bronzes. In addition, it has a moderately low base cost and a moderately high embodied energy.
The properties of C62400 bronze include seven 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 C62400 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
11 to 14 %
Poisson's Ratio
0.34
Shear Modulus
42 GPa 6.1 x 106 psi
Shear Strength
420 to 440 MPa 61 to 64 x 103 psi
Tensile Strength: Ultimate (UTS)
690 to 730 MPa 100 to 110 x 103 psi
Tensile Strength: Yield (Proof)
270 to 350 MPa 39 to 51 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
220 °C 430 °F
Melting Completion (Liquidus)
1040 °C 1900 °F
Melting Onset (Solidus)
1030 °C 1880 °F
Specific Heat Capacity
440 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
59 W/m-K 34 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
27 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
3.2 kg CO2/kg material
Embodied Energy
53 MJ/kg 23 x 103 BTU/lb
Embodied Water
400 L/kg 47 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
68 to 77 MJ/m3
Resilience: Unit (Modulus of Resilience)
320 to 550 kJ/m3
Stiffness to Weight: Axial
7.6 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
23 to 25 points
Strength to Weight: Bending
21 to 22 points
Thermal Diffusivity
16 mm2/s
Thermal Shock Resistance
25 to 26 points
Alloy Composition
Among wrought copper alloys, the composition of C62400 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 | 82.8 to 88 | |
| Al | 10 to 11.5 | |
| Fe | 2.0 to 4.5 | |
| Mn | 0 to 0.3 | |
| Si | 0 to 0.25 | |
| Sn | 0 to 0.2 | |
| 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
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001