Silicon Bronze Copper Alloy - CDA 655
Silicon Bronze Copper Alloy (CDA 655) is a copper alloy primarily composed of copper, silicon, and small amounts of other elements like manganese and iron. It is known for its excellent corrosion resistance, high strength, and good weldability, making it ideal for various applications, particularly in marine environments.
Chemical Composition
Element |
Composition (%) |
Copper (Cu) |
96.0-98.0 |
Silicon (Si) |
2.8-3.8 |
Manganese (Mn) |
0.50-1.3 |
Iron (Fe) |
0.20 max |
Zinc (Zn) |
0.50 max |
Lead (Pb) |
0.05 max |
Physical Properties
Property |
Value |
Density |
0.308 lb/in³ (8.53 g/cm³) |
Melting Range |
1,850-1,900°F (1,010-1,038°C) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Electrical Conductivity |
7% IACS |
Electrical Resistivity |
14.5 μΩ·in |
Thermal Conductivity |
19 Btu/ft²/ft·h·°F (33 W/m·K) |
Coefficient of Thermal Expansion |
9.8 × 10⁻⁶ in/in/°F (17.6 × 10⁻⁶ m/m/°C) |
Mechanical Properties
Property |
Value |
Tensile Strength |
70,000-95,000 psi (483-655 MPa) |
Yield Strength |
30,000-70,000 psi (207-483 MPa) |
Elongation |
10-45% |
Hardness |
65-115 Brinell |
Modulus of Elasticity |
16,000 ksi (110 GPa) |
Shear Modulus |
6,000 ksi (41 GPa) |
Thermal Properties
Property |
Value |
Melting Range |
1,850-1,900°F (1,010-1,038°C) |
Thermal Conductivity |
19 Btu/ft²/ft·h·°F (33 W/m·K) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Coefficient of Thermal Expansion |
9.8 × 10⁻⁶ in/in/°F (17.6 × 10⁻⁶ m/m/°C) |
Fabrication Properties
Property |
Characteristic |
Capacity for Cold Working |
Good |
Capacity for Hot Forming |
Excellent |
Machinability (Free Cutting Brass = 100) |
20 |
Soldering |
Good |
Brazing |
Excellent |
Oxyacetylene Welding |
Good |
Gas Shielded Arc Welding |
Excellent |
Resistance Welding - Spot and Seam |
Fair |
Resistance Welding - Butt |
Good |
Common Applications
Common applications for Silicon Bronze Copper Alloy (CDA 655) include:
- Marine Hardware: Used for fittings, fasteners, and other components exposed to seawater.
- Architectural Applications: Utilized in decorative architectural elements, such as handrails and window frames.
- Electrical Applications: Suitable for connectors and terminals due to its good electrical conductivity.
- Shipbuilding: Components in boats and ships, including propellers and rudders.
- Welding and Fabrication: Employed in welding rods and filler materials because of its weldability.
- Hydraulic Systems: Used in hydraulic components and fittings where corrosion resistance is needed.
- Artistic Applications: Popular in sculpture and artistic metalwork due to its appealing appearance and patina.
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