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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.

Copper (Cu) 71 to 78.5
Manganese (Mn) 11 to 14
Aluminum (Al) 7.0 to 8.5
Iron (Fe) 2.0 to 4.0
Nickel (Ni) 1.5 to 3.0
Silicon (Si) 0 to 0.1
Lead (Pb) 0 to 0.030
Residuals 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