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UNS C95600 Silicon-Aluminum Bronze

C95600 bronze is a bronze formulated for casting. Cited properties are appropriate for the as-fabricated (no temper or treatment) condition. C95600 is the UNS number for this material. Additionally, the common industry name is Aluminum Bronze E. Older literature may refer to this material as ASTM Alloy 9E, but this is now discouraged.

It has a moderately low base cost among cast bronzes. In addition, it has a moderately low electrical conductivity and a moderately low thermal conductivity.

The graph bars on the material properties cards below compare C95600 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

110 GPa 16 x 106 psi

Elongation at Break

15 %

Poisson's Ratio

0.34

Shear Modulus

42 GPa 6.0 x 106 psi

Tensile Strength: Ultimate (UTS)

500 MPa 72 x 103 psi

Tensile Strength: Yield (Proof)

230 MPa 33 x 103 psi

Thermal Properties

Latent Heat of Fusion

260 J/g

Maximum Temperature: Mechanical

210 °C 410 °F

Melting Completion (Liquidus)

1000 °C 1840 °F

Melting Onset (Solidus)

980 °C 1800 °F

Specific Heat Capacity

430 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

39 W/m-K 23 BTU/h-ft-°F

Thermal Expansion

17 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

8.0 % IACS

Electrical Conductivity: Equal Weight (Specific)

8.7 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

8.3 g/cm3 520 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

50 MJ/kg 21 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

60 MJ/m3

Resilience: Unit (Modulus of Resilience)

230 kJ/m3

Stiffness to Weight: Axial

7.5 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

17 points

Strength to Weight: Bending

17 points

Thermal Diffusivity

11 mm2/s

Thermal Shock Resistance

18 points

Alloy Composition

Among cast copper alloys, the composition of C95600 bronze is notable for containing comparatively high amounts of silicon (Si) and aluminum (Al). Silicon is used to improve casting fluidity and lower melting temperature. It also raises strength at the expense of ductility. Aluminum is used to add strength and oxidation resistance, at the cost of requiring additional care during casting.

Copper (Cu) 88 to 92.2
Aluminum (Al) 6.0 to 8.0
Silicon (Si) 1.8 to 3.2
Nickel (Ni) 0 to 0.25
Residuals 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

ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001