UNS C95500 Aluminum Bronze
C95500 bronze is a bronze formulated for casting. C95500 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze D. Older literature may refer to this material as ASTM Alloy 9D, but this is now discouraged.
It has a very high heat capacity among cast bronzes. In addition, it has a very high melting temperature and can have a fairly high tensile strength.
The properties of C95500 bronze include two common variations. This page shows summary ranges across both of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C95500 bronze to: cast 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
Brinell Hardness
200 to 210
Elastic (Young's, Tensile) Modulus
120 GPa 17 x 106 psi
Elongation at Break
8.4 to 10 %
Poisson's Ratio
0.34
Shear Modulus
44 GPa 6.4 x 106 psi
Tensile Strength: Ultimate (UTS)
700 to 850 MPa 100 to 120 x 103 psi
Tensile Strength: Yield (Proof)
320 to 470 MPa 46 to 69 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
230 °C 450 °F
Melting Completion (Liquidus)
1050 °C 1930 °F
Melting Onset (Solidus)
1040 °C 1900 °F
Specific Heat Capacity
450 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
42 W/m-K 24 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.8 % IACS
Otherwise Unclassified Properties
Base Metal Price
28 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
3.5 kg CO2/kg material
Embodied Energy
57 MJ/kg 24 x 103 BTU/lb
Embodied Water
390 L/kg 46 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
58 to 61 MJ/m3
Resilience: Unit (Modulus of Resilience)
420 to 950 kJ/m3
Stiffness to Weight: Axial
8.0 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
24 to 29 points
Strength to Weight: Bending
21 to 24 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
24 to 29 points
Alloy Composition
Among cast copper alloys, the composition of C95500 bronze is notable for containing comparatively high amounts of iron (Fe) and aluminum (Al). Iron is used to increase strength inexpensively. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.
| Cu | 78 to 84 | |
| Al | 10 to 11.5 | |
| Ni | 3.0 to 5.5 | |
| Fe | 3.0 to 5.0 | |
| Mn | 0 to 3.5 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B148: Standard Specification for Aluminum-Bronze Sand Castings
ASTM B271: Standard Specification for Copper-Base Alloy Centrifugal Castings
ASTM B505: Standard Specification for Copper Alloy Continuous Castings
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