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UNS C95300 Aluminum Bronze

C95300 bronze is a bronze formulated for casting. C95300 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze B. Older literature may refer to this material as ASTM Alloy 9B, but this is now discouraged.

It has a very high melting temperature among cast bronzes. In addition, it has a fairly high heat capacity and a moderately low base cost.

The properties of C95300 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 C95300 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

120 to 170

Elastic (Young's, Tensile) Modulus

110 GPa 16 x 106 psi

Elongation at Break

14 to 25 %

Poisson's Ratio


Shear Modulus

42 GPa 6.0 x 106 psi

Tensile Strength: Ultimate (UTS)

520 to 610 MPa 75 to 89 x 103 psi

Tensile Strength: Yield (Proof)

190 to 310 MPa 28 to 44 x 103 psi

Thermal Properties

Latent Heat of Fusion

230 J/g

Maximum Temperature: Mechanical

220 °C 430 °F

Melting Completion (Liquidus)

1050 °C 1910 °F

Melting Onset (Solidus)

1040 °C 1900 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

63 W/m-K 36 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

28 % relative


8.3 g/cm3 520 lb/ft3

Embodied Carbon

3.1 kg CO2/kg material

Embodied Energy

52 MJ/kg 22 x 103 BTU/lb

Embodied Water

390 L/kg 47 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

73 to 100 MJ/m3

Resilience: Unit (Modulus of Resilience)

170 to 420 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

17 to 21 points

Strength to Weight: Bending

17 to 19 points

Thermal Diffusivity

17 mm2/s

Thermal Shock Resistance

19 to 22 points

Alloy Composition

Among cast copper alloys, the composition of C95300 bronze is notable for containing comparatively high amounts of aluminum (Al) and iron (Fe). Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting. Iron is used to increase strength inexpensively.

Copper (Cu)Cu 86.5 to 90.2
Aluminum (Al)Al 9.0 to 11
Iron (Fe)Fe 0.8 to 1.5
Residualsres. 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

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