UNS C65100 (CW115C) Silicon Bronze
C65100 bronze is a bronze formulated for primary forming into wrought products. CW115C is the EN numeric designation for this material. C65100 is the UNS number. Additionally, the EN chemical designation is CuSi1. And the common industry name is Low-Silicon Bronze B.
It has the lowest embodied energy and can have a moderately low tensile strength among wrought bronzes.
The properties of C65100 bronze include nine 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 C65100 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
2.4 to 50 %
Poisson's Ratio
0.34
Shear Modulus
43 GPa 6.3 x 106 psi
Shear Strength
200 to 350 MPa 29 to 50 x 103 psi
Tensile Strength: Ultimate (UTS)
280 to 560 MPa 40 to 82 x 103 psi
Tensile Strength: Yield (Proof)
95 to 440 MPa 14 to 63 x 103 psi
Thermal Properties
Latent Heat of Fusion
230 J/g
Maximum Temperature: Mechanical
200 °C 390 °F
Melting Completion (Liquidus)
1060 °C 1940 °F
Melting Onset (Solidus)
1030 °C 1890 °F
Specific Heat Capacity
390 J/kg-K 0.094 BTU/lb-°F
Thermal Conductivity
57 W/m-K 33 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
12 % IACS
Electrical Conductivity: Equal Weight (Specific)
12 % IACS
Otherwise Unclassified Properties
Base Metal Price
30 % relative
Calomel Potential
-280 mV
Density
8.8 g/cm3 550 lb/ft3
Embodied Carbon
2.6 kg CO2/kg material
Embodied Energy
41 MJ/kg 18 x 103 BTU/lb
Embodied Water
300 L/kg 36 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
12 to 110 MJ/m3
Resilience: Unit (Modulus of Resilience)
39 to 820 kJ/m3
Stiffness to Weight: Axial
7.3 points
Stiffness to Weight: Bending
18 points
Strength to Weight: Axial
8.7 to 18 points
Strength to Weight: Bending
11 to 17 points
Thermal Diffusivity
16 mm2/s
Thermal Shock Resistance
9.5 to 19 points
Alloy Composition
Among wrought copper alloys, the composition of C65100 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 | 94.5 to 99.2 | |
| Si | 0.8 to 2.0 | |
| Zn | 0 to 1.5 | |
| Fe | 0 to 0.8 | |
| Mn | 0 to 0.7 | |
| 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 B98: Standard Specification for Copper-Silicon Alloy Rod, Bar and Shapes
ASTM B96: Standard Specification for Copper-Silicon Alloy Plate, Sheet, Strip, and Rolled Bar for General Purposes and Pressure Vessels
Copper: Its Trade, Manufacture, Use, and Environmental Status, Gunter Joseph, 2001
Pressure Vessels: External Pressure Technology, 2nd ed., Carl T. F. Ross, 2011
Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, ASM Handbook vol. 2, ASM International, 1993