UNS C61900 Aluminum Bronze
C61900 bronze is a bronze formulated for primary forming into wrought products. It has a moderately high heat capacity and a moderately high melting temperature among wrought bronzes.
The properties of C61900 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 C61900 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
21 to 32 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
370 to 410 MPa 54 to 59 x 103 psi
Tensile Strength: Ultimate (UTS)
570 to 650 MPa 82 to 94 x 103 psi
Tensile Strength: Yield (Proof)
230 to 310 MPa 33 to 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
220 °C 430 °F
Melting Completion (Liquidus)
1050 °C 1920 °F
Melting Onset (Solidus)
1040 °C 1910 °F
Specific Heat Capacity
440 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
79 W/m-K 46 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
11 % IACS
Electrical Conductivity: Equal Weight (Specific)
11 % 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
51 MJ/kg 22 x 103 BTU/lb
Embodied Water
380 L/kg 46 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
110 to 150 MJ/m3
Resilience: Unit (Modulus of Resilience)
230 to 430 kJ/m3
Stiffness to Weight: Axial
7.6 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
19 to 22 points
Strength to Weight: Bending
18 to 20 points
Thermal Diffusivity
22 mm2/s
Thermal Shock Resistance
20 to 23 points
Alloy Composition
Among wrought copper alloys, the composition of C61900 bronze is notable for including aluminum (Al) and containing a comparatively high amount of iron (Fe). Aluminum is used to add strength and oxidation resistance. Iron is used to increase strength inexpensively.
| Cu | 83.6 to 88.5 | |
| Al | 8.5 to 10 | |
| Fe | 3.0 to 4.5 | |
| Zn | 0 to 0.8 | |
| Sn | 0 to 0.6 | |
| Pb | 0 to 0.020 | |
| 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