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UNS C95500 Aluminum Bronze

C95500 bronze is a bronze formulated for casting. C95500 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze D. Older literature may refer to this material as ASTM Alloy 9D, but this is now discouraged.

It has a very high heat capacity among cast bronzes. In addition, it has a very high melting temperature and can have a fairly high tensile strength.

The properties of C95500 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 C95500 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

200 to 210

Elastic (Young's, Tensile) Modulus

120 GPa 17 x 106 psi

Elongation at Break

8.4 to 10 %

Poisson's Ratio

0.34

Shear Modulus

44 GPa 6.4 x 106 psi

Tensile Strength: Ultimate (UTS)

700 to 850 MPa 100 to 120 x 103 psi

Tensile Strength: Yield (Proof)

320 to 470 MPa 46 to 69 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

230 °C 450 °F

Melting Completion (Liquidus)

1050 °C 1930 °F

Melting Onset (Solidus)

1040 °C 1900 °F

Specific Heat Capacity

450 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

42 W/m-K 24 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.8 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

3.5 kg CO2/kg material

Embodied Energy

57 MJ/kg 24 x 103 BTU/lb

Embodied Water

390 L/kg 46 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

58 to 61 MJ/m3

Resilience: Unit (Modulus of Resilience)

420 to 950 kJ/m3

Stiffness to Weight: Axial

8.0 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

24 to 29 points

Strength to Weight: Bending

21 to 24 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

24 to 29 points

Alloy Composition

Among cast copper alloys, the composition of C95500 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) 78 to 84
Aluminum (Al) 10 to 11.5
Nickel (Ni) 3.0 to 5.5
Iron (Fe) 3.0 to 5.0
Manganese (Mn) 0 to 3.5
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 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

CRC Materials Science and Engineering Handbook, 4th ed., James F. Shackelford et al. (editors), 2015