UNS C61300 (ERCuAl-A2) Aluminum Bronze
C61300 bronze is a bronze formulated for primary forming into wrought products. ERCuAl-A2 is the AWS designation for this material. C61300 is the UNS number. It has a moderately high melting temperature and can have a moderately high ductility among wrought bronzes.
The properties of C61300 bronze include five 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 C61300 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
34 to 40 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
370 to 390 MPa 54 to 56 x 103 psi
Tensile Strength: Ultimate (UTS)
550 to 580 MPa 79 to 84 x 103 psi
Tensile Strength: Yield (Proof)
230 to 310 MPa 33 to 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
220 J/g
Maximum Temperature: Mechanical
210 °C 420 °F
Melting Completion (Liquidus)
1050 °C 1910 °F
Melting Onset (Solidus)
1040 °C 1910 °F
Specific Heat Capacity
420 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
55 W/m-K 32 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
29 % relative
Density
8.5 g/cm3 530 lb/ft3
Embodied Carbon
3.0 kg CO2/kg material
Embodied Energy
49 MJ/kg 21 x 103 BTU/lb
Embodied Water
370 L/kg 44 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
150 to 190 MJ/m3
Resilience: Unit (Modulus of Resilience)
230 to 410 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
18 to 19 points
Strength to Weight: Bending
18 points
Thermal Diffusivity
15 mm2/s
Thermal Shock Resistance
19 to 20 points
Alloy Composition
Among wrought copper alloys, the composition of C61300 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 | 88 to 91.8 | |
| Al | 6.0 to 7.5 | |
| Fe | 2.0 to 3.0 | |
| Sn | 0.2 to 0.5 | |
| Mn | 0 to 0.2 | |
| Zn | 0 to 0.2 | |
| Ni | 0 to 0.15 | |
| Si | 0 to 0.1 | |
| P | 0 to 0.015 | |
| Pb | 0 to 0.010 | |
| res. | 0 to 0.2 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B169: Standard Specification for Aluminum Bronze Sheet, Strip, and Rolled Bar
ASTM B150: Standard Specification for Aluminum Bronze Rod, Bar, and Shapes
ASTM B111: Standard Specification for Copper and Copper-Alloy Seamless Condenser Tubes and Ferrule Stock
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