UNS C95300 Aluminum Bronze
C95300 bronze is a bronze formulated for casting. C95300 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze B. Older literature may refer to this material as ASTM Alloy 9B, but this is now discouraged.
It has a very high melting temperature among cast bronzes. In addition, it has a fairly high heat capacity and a moderately low base cost.
The properties of C95300 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 C95300 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
120 to 170
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Elongation at Break
14 to 25 %
Poisson's Ratio
0.34
Shear Modulus
42 GPa 6.0 x 106 psi
Tensile Strength: Ultimate (UTS)
520 to 610 MPa 75 to 89 x 103 psi
Tensile Strength: Yield (Proof)
190 to 310 MPa 28 to 44 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
220 °C 430 °F
Melting Completion (Liquidus)
1050 °C 1910 °F
Melting Onset (Solidus)
1040 °C 1900 °F
Specific Heat Capacity
440 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
63 W/m-K 36 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
28 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
3.1 kg CO2/kg material
Embodied Energy
52 MJ/kg 22 x 103 BTU/lb
Embodied Water
390 L/kg 47 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
73 to 100 MJ/m3
Resilience: Unit (Modulus of Resilience)
170 to 420 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
17 to 21 points
Strength to Weight: Bending
17 to 19 points
Thermal Diffusivity
17 mm2/s
Thermal Shock Resistance
19 to 22 points
Alloy Composition
Among cast copper alloys, the composition of C95300 bronze is notable for containing comparatively high amounts of aluminum (Al) and iron (Fe). Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting. Iron is used to increase strength inexpensively.
| Cu | 86.5 to 90.2 | |
| Al | 9.0 to 11 | |
| Fe | 0.8 to 1.5 | |
| res. | 0 to 1.0 |
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