UNS C95600 Silicon-Aluminum Bronze
C95600 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C95600 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze E. Older literature may refer to this material as ASTM Alloy 9E, but this is now discouraged.
It has a moderately low base cost among cast bronzes. In addition, it has a moderately low electrical conductivity and a moderately low thermal conductivity.
The graph bars on the material properties cards below compare C95600 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
Elastic (Young's, Tensile) Modulus
110 GPa 16 x 106 psi
Elongation at Break
15 %
Poisson's Ratio
0.34
Shear Modulus
42 GPa 6.0 x 106 psi
Tensile Strength: Ultimate (UTS)
500 MPa 72 x 103 psi
Tensile Strength: Yield (Proof)
230 MPa 33 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
210 °C 410 °F
Melting Completion (Liquidus)
1000 °C 1840 °F
Melting Onset (Solidus)
980 °C 1800 °F
Specific Heat Capacity
430 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
39 W/m-K 23 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
8.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
8.7 % IACS
Otherwise Unclassified Properties
Base Metal Price
28 % relative
Density
8.3 g/cm3 520 lb/ft3
Embodied Carbon
3.0 kg CO2/kg material
Embodied Energy
50 MJ/kg 21 x 103 BTU/lb
Embodied Water
360 L/kg 43 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
60 MJ/m3
Resilience: Unit (Modulus of Resilience)
230 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
17 points
Strength to Weight: Bending
17 points
Thermal Diffusivity
11 mm2/s
Thermal Shock Resistance
18 points
Alloy Composition
Among cast copper alloys, the composition of C95600 bronze is notable for containing comparatively high amounts of silicon (Si) and aluminum (Al). Silicon is used to improve casting fluidity and lower melting temperature. It also raises strength at the expense of ductility. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.
| Cu | 88 to 92.2 | |
| Al | 6.0 to 8.0 | |
| Si | 1.8 to 3.2 | |
| Ni | 0 to 0.25 | |
| 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
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001