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UNS C62300 Aluminum Bronze

C62300 bronze is a bronze formulated for primary forming into wrought products. C62300 is the UNS number for this material. Additionally, the common industry name is 9% Aluminum Bronze. It has a moderately high heat capacity and a moderately high melting temperature among wrought bronzes.

The properties of C62300 bronze include three common variations. This page shows summary ranges across all of them. For more specific values, follow the links immediately below. The graph bars on the material properties cards further below compare C62300 bronze to: wrought 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

18 to 32 %

Poisson's Ratio

0.34

Shear Modulus

43 GPa 6.2 x 106 psi

Shear Strength

360 to 390 MPa 53 to 57 x 103 psi

Tensile Strength: Ultimate (UTS)

570 to 630 MPa 82 to 92 x 103 psi

Tensile Strength: Yield (Proof)

230 to 310 MPa 34 to 46 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 1910 °F

Specific Heat Capacity

440 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

54 W/m-K 31 BTU/h-ft-°F

Thermal Expansion

18 µm/m-K

Electrical Properties

Electrical Conductivity: Equal Volume

12 % IACS

Electrical Conductivity: Equal Weight (Specific)

13 % IACS

Otherwise Unclassified Properties

Base Metal Price

28 % relative

Density

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 46 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

95 to 150 MJ/m3

Resilience: Unit (Modulus of Resilience)

240 to 430 kJ/m3

Stiffness to Weight: Axial

7.6 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

19 to 21 points

Strength to Weight: Bending

18 to 20 points

Thermal Diffusivity

15 mm2/s

Thermal Shock Resistance

20 to 22 points

Alloy Composition

Among wrought copper alloys, the composition of C62300 bronze is notable for including aluminum (Al) and silicon (Si). Aluminum is used to add strength and oxidation resistance. Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy.

Copper (Cu) 83.2 to 89.5
Aluminum (Al) 8.5 to 10
Iron (Fe) 2.0 to 4.0
Nickel (Ni) 0 to 1.0
Tin (Sn) 0 to 0.6
Manganese (Mn) 0 to 0.5
Silicon (Si) 0 to 0.25
Residuals 0 to 0.5

All values are % weight. Ranges represent what is permitted under applicable standards.

Followup Questions

Similar Alloys

Further Reading

ASTM B150: Standard Specification for Aluminum Bronze Rod, Bar, and Shapes

ASTM B124: Standard Specification for Copper and Copper Alloy Forging Rod, Bar, and Shapes

ASTM B283: Standard Specification for Copper and Copper-Alloy Die Forgings (Hot-Pressed)

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