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UNS C95400 Aluminum Bronze

C95400 bronze is a bronze formulated for casting. C95400 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze C. Older literature may refer to this material as ASTM Alloy 9C, but this is now discouraged.

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

The properties of C95400 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 C95400 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

160 to 200

Elastic (Young's, Tensile) Modulus

110 GPa 17 x 106 psi

Elongation at Break

8.1 to 16 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 x 106 psi

Tensile Strength: Ultimate (UTS)

600 to 710 MPa 87 to 100 x 103 psi

Tensile Strength: Yield (Proof)

240 to 360 MPa 35 to 52 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

230 °C 440 °F

Melting Completion (Liquidus)

1040 °C 1900 °F

Melting Onset (Solidus)

1030 °C 1880 °F

Specific Heat Capacity

440 J/kg-K 0.11 BTU/lb-°F

Thermal Conductivity

59 W/m-K 34 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

27 % relative

Density

8.2 g/cm3 510 lb/ft3

Embodied Carbon

3.2 kg CO2/kg material

Embodied Energy

53 MJ/kg 23 x 103 BTU/lb

Embodied Water

390 L/kg 47 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

48 to 75 MJ/m3

Resilience: Unit (Modulus of Resilience)

250 to 560 kJ/m3

Stiffness to Weight: Axial

7.7 points

Stiffness to Weight: Bending

20 points

Strength to Weight: Axial

20 to 24 points

Strength to Weight: Bending

19 to 22 points

Thermal Diffusivity

16 mm2/s

Thermal Shock Resistance

21 to 25 points

Alloy Composition

Among cast copper alloys, the composition of C95400 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) 83 to 87
Aluminum (Al) 10 to 11.5
Iron (Fe) 3.0 to 5.0
Nickel (Ni) 0 to 1.5
Manganese (Mn) 0 to 0.5
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