C65500 High Silicon Bronze 'A'
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C65500 High Silicon Bronze 'A'
C65500 is a high strength, engineering alloy that has excellent resistance to a wide range of corrosives, including fresh and salt water, most acids, alkalies, salts, and organic chemicals. However, it is not suitable for use with sulfides, nitric acid, acid chromates, or oxidizing salts such as ferric chloride.
UNS C65500 (CW116C) Silicon Bronze
C65500 bronze is a bronze formulated for primary forming into wrought products. CW116C is the EN numeric designation for this material. C65500 is the UNS number. Additionally, the EN chemical designation is CuSi3Mn1. The British Standard (BS) designation is CS101. And the common industry name is High-Silicon Bronze A.
It has a moderately low electrical conductivity among wrought bronzes. In addition, it can have the highest ductility and has a moderately low embodied energy.
Mechanical Properties
Elastic (Young's, Tensile) Modulus
120 GPa17 x 106 psi
Elongation at Break
4.0 to 70 %
Poisson's Ratio
0.34
Rockwell B Hardness
62 to 97
Shear Modulus
43 GPa6.3 x 106 psi
Shear Strength
260 to 440 MPa38 to 63 x 103 psi
Tensile Strength: Ultimate (UTS)
360 to 760 MPa52 to 110 x 103 psi
Tensile Strength: Yield (Proof)
120 to 430 MPa17 to 62 x 103 psi
Thermal Properties
Latent Heat of Fusion
260 J/g
Maximum Temperature: Mechanical
200 °C390 °F
Melting Completion (Liquidus)
1030 °C1880 °F
Melting Onset (Solidus)
970 °C1780 °F
Specific Heat Capacity
400 J/kg-K0.1 BTU/lb-°F
Thermal Conductivity
36 W/m-K21 BTU/h-ft-°F
Thermal Expansion
18 µm/m-K
Electrical Properties
Electrical Conductivity: Equal Volume
7.0 % IACS
Electrical Conductivity: Equal Weight (Specific)
7.3 % IACS
Otherwise Unclassified Properties
Base Metal Price
29 % relative
Calomel Potential
-270 mV
Density
8.6 g/cm3540 lb/ft3
Embodied Carbon
2.7 kg CO2/kg material
Embodied Energy
42 MJ/kg18 x 103 BTU/lb
Embodied Water
300 L/kg36 gal/lb
Common Calculations
Resilience: Ultimate (Unit Rupture Work)
11 to 450 MJ/m3
Resilience: Unit (Modulus of Resilience)
62 to 790 kJ/m3
Stiffness to Weight: Axial
7.5 points
Stiffness to Weight: Bending
19 points
Strength to Weight: Axial
12 to 24 points
Strength to Weight: Bending
13 to 21 points
Thermal Diffusivity
10 mm2/s
Thermal Shock Resistance
12 to 26 points
Alloy Composition
Among wrought copper alloys, the composition of C65500 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.
| Copper (Cu) | 91.5 to 96.7 | |
| Silicon (Si) | 2.8 to 3.8 | |
| Manganese (Mn) | 0.5 to 1.3 | |
| Zinc (Zn) | 0 to 1.5 | |
| Iron (Fe) | 0 to 0.8 | |
| Nickel (Ni) | 0 to 0.6 | |
| 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
How are the material properties defined?Why does this material have multiple names?
How does C65500 bronze compare to other copper alloys?How does it compare to other metal alloys?
Similar Alloys
UNS C66100 Leaded Silicon BronzeUNS C87200 Silicon Bronze
UNS C87300 Silicon BronzeUNS C65400 Silicon Bronze
UNS C65100 (CW115C) Silicon BronzeUNS C63800 Aluminum Bronze
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
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)
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
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