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.
| Cu | 89 to 92.2 | |
| Al | 6.3 to 7.0 | |
| Si | 1.5 to 2.0 | |
| Zn | 0 to 0.5 | |
| Fe | 0 to 0.3 | |
| Ni | 0 to 0.25 | |
| Sn | 0 to 0.2 | |
| As | 0 to 0.15 | |
| Mn | 0 to 0.1 | |
| Pb | 0 to 0.050 | |
| res. | 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