UNS C95400 Aluminum Bronze
C95400 bronze is a bronze formulated for casting. C95400 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze C. Older literature may refer to this material as ASTM Alloy 9C, but this is now discouraged.
It has a fairly high heat capacity among cast bronzes. In addition, it has a very high melting temperature and can have a moderately high tensile strength.
The properties of C95400 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 C95400 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
160 to 200
Elastic (Young's, Tensile) Modulus
110 GPa 17 x 106 psi
Elongation at Break
8.1 to 16 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.2 x 106 psi
Tensile Strength: Ultimate (UTS)
600 to 710 MPa 87 to 100 x 103 psi
Tensile Strength: Yield (Proof)
240 to 360 MPa 35 to 52 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
230 °C 440 °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
13 % IACS
Electrical Conductivity: Equal Weight (Specific)
14 % 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
390 L/kg 47 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
48 to 75 MJ/m3
Resilience: Unit (Modulus of Resilience)
250 to 560 kJ/m3
Stiffness to Weight: Axial
7.7 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
20 to 24 points
Strength to Weight: Bending
19 to 22 points
Thermal Diffusivity
16 mm2/s
Thermal Shock Resistance
21 to 25 points
Alloy Composition
Among cast copper alloys, the composition of C95400 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 | 83 to 87 | |
| Al | 10 to 11.5 | |
| Fe | 3.0 to 5.0 | |
| Ni | 0 to 1.5 | |
| Mn | 0 to 0.5 | |
| 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