UNS C95700 Manganese-Aluminum Bronze
C95700 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C95700 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze F. Older literature may refer to this material as ASTM Alloy 9F, but this is now discouraged.
It has the lowest thermal conductivity among cast bronzes. In addition, it has a very low electrical conductivity and a fairly high heat capacity.
The graph bars on the material properties cards below compare C95700 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
130 GPa 18 x 106 psi
Elongation at Break
23 %
Poisson's Ratio
0.34
Shear Modulus
47 GPa 6.8 x 106 psi
Tensile Strength: Ultimate (UTS)
680 MPa 99 x 103 psi
Tensile Strength: Yield (Proof)
310 MPa 45 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
220 °C 430 °F
Melting Completion (Liquidus)
990 °C 1810 °F
Melting Onset (Solidus)
950 °C 1740 °F
Specific Heat Capacity
440 J/kg-K 0.11 BTU/lb-°F
Thermal Conductivity
12 W/m-K 6.9 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
3.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
3.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
26 % relative
Density
8.2 g/cm3 510 lb/ft3
Embodied Carbon
3.3 kg CO2/kg material
Embodied Energy
54 MJ/kg 23 x 103 BTU/lb
Embodied Water
360 L/kg 43 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
130 MJ/m3
Resilience: Unit (Modulus of Resilience)
390 kJ/m3
Stiffness to Weight: Axial
8.5 points
Stiffness to Weight: Bending
20 points
Strength to Weight: Axial
23 points
Strength to Weight: Bending
21 points
Thermal Diffusivity
3.3 mm2/s
Thermal Shock Resistance
21 points
Alloy Composition
Among cast copper alloys, the composition of C95700 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 | 71 to 78.5 | |
| Mn | 11 to 14 | |
| Al | 7.0 to 8.5 | |
| Fe | 2.0 to 4.0 | |
| Ni | 1.5 to 3.0 | |
| Si | 0 to 0.1 | |
| Pb | 0 to 0.030 | |
| 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 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