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UNS C64210 Aluminum-Silicon Bronze

C64210 bronze is a bronze formulated for primary forming into wrought products. It has a moderately low thermal conductivity and a moderately high ductility among wrought bronzes.

The properties of C64210 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 C64210 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

35 %

Poisson's Ratio

0.34

Rockwell B Hardness

77

Shear Modulus

42 GPa 6.1 x 106 psi

Shear Strength

380 MPa 55 x 103 psi

Tensile Strength: Ultimate (UTS)

570 MPa 83 x 103 psi

Tensile Strength: Yield (Proof)

290 MPa 41 x 103 psi

Thermal Properties

Latent Heat of Fusion

250 J/g

Maximum Temperature: Mechanical

210 °C 410 °F

Melting Completion (Liquidus)

1040 °C 1910 °F

Melting Onset (Solidus)

990 °C 1810 °F

Specific Heat Capacity

430 J/kg-K 0.1 BTU/lb-°F

Thermal Conductivity

48 W/m-K 28 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

29 % relative

Density

8.4 g/cm3 520 lb/ft3

Embodied Carbon

3.0 kg CO2/kg material

Embodied Energy

49 MJ/kg 21 x 103 BTU/lb

Embodied Water

360 L/kg 43 gal/lb

Common Calculations

Resilience: Ultimate (Unit Rupture Work)

170 MJ/m3

Resilience: Unit (Modulus of Resilience)

360 kJ/m3

Stiffness to Weight: Axial

7.4 points

Stiffness to Weight: Bending

19 points

Strength to Weight: Axial

19 points

Strength to Weight: Bending

18 points

Thermal Diffusivity

13 mm2/s

Thermal Shock Resistance

21 points

Alloy Composition

Among wrought copper alloys, the composition of C64210 bronze is notable for including arsenic (As) and aluminum (Al). Arsenic is used to protect the alloy against dezincification. Aluminum is used to add strength and oxidation resistance.

Copper (Cu) 89 to 92.2
Aluminum (Al) 6.3 to 7.0
Silicon (Si) 1.5 to 2.0
Zinc (Zn) 0 to 0.5
Iron (Fe) 0 to 0.3
Nickel (Ni) 0 to 0.25
Tin (Sn) 0 to 0.2
Arsenic (As) 0 to 0.15
Manganese (Mn) 0 to 0.1
Lead (Pb) 0 to 0.050
Residuals 0 to 0.5

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

Followup Questions

Similar Alloys

Further Reading

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