UNS C66100 Leaded Silicon Bronze
C66100 bronze is a bronze formulated for primary forming into wrought products. It has the lowest thermal conductivity and a moderately low embodied energy among wrought bronzes.
The properties of C66100 bronze include five 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 C66100 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
120 GPa 17 x 106 psi
Elongation at Break
8.0 to 40 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.2 x 106 psi
Shear Strength
280 to 460 MPa 40 to 67 x 103 psi
Tensile Strength: Ultimate (UTS)
410 to 790 MPa 60 to 110 x 103 psi
Tensile Strength: Yield (Proof)
120 to 430 MPa 17 to 62 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
200 °C 390 °F
Melting Completion (Liquidus)
1050 °C 1930 °F
Melting Onset (Solidus)
1000 °C 1830 °F
Specific Heat Capacity
400 J/kg-K 0.1 BTU/lb-°F
Thermal Conductivity
34 W/m-K 19 BTU/h-ft-°F
Thermal Expansion
17 µm/m-K
Otherwise Unclassified Properties
Base Metal Price
29 % relative
Density
8.7 g/cm3 540 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
42 MJ/kg 18 x 103 BTU/lb
Embodied Water
300 L/kg 36 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
53 to 120 MJ/m3
Resilience: Unit (Modulus of Resilience)
60 to 790 kJ/m3
Stiffness to Weight: Axial
7.4 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
13 to 25 points
Strength to Weight: Bending
14 to 22 points
Thermal Diffusivity
9.7 mm2/s
Thermal Shock Resistance
15 to 29 points
Alloy Composition
Among wrought copper alloys, the composition of C66100 bronze is notable for including silicon (Si) and manganese (Mn). Silicon is used to increase strength at the expense of ductility. It also lowers the melting temperature and raises the fluidity of the alloy. Manganese is used to improve strength without a proportional reduction in ductility.
| Cu | 92 to 97 | |
| Si | 2.8 to 3.5 | |
| Mn | 0 to 1.5 | |
| Zn | 0 to 1.5 | |
| Pb | 0.2 to 0.8 | |
| Fe | 0 to 0.25 | |
| res. | 0 to 0.5 |
All values are % weight. Ranges represent what is permitted under applicable standards.
Followup Questions
Similar Alloys
Further Reading
ASTM B98: Standard Specification for Copper-Silicon Alloy Rod, Bar and Shapes
ASM Specialty Handbook: Copper and Copper Alloys, J. R. Davis (editor), 2001