Commercial Bronze Copper Alloy - CDA 220
Commercial Bronze Copper Alloy (CDA 220) is a copper alloy composed of approximately 90% copper and 10% zinc. It offers good strength, corrosion resistance, and excellent formability, making it ideal for applications requiring both conductivity and durability.
CDA 220 has a reddish-golden color and is commonly used in decorative and electrical components.
Chemical Composition
Element |
Composition (%) |
Copper (Cu) |
90.0% Min |
Tin (Sn) |
10.0% |
Lead (Pb) |
0.5% Max |
Other Elements (Total) |
0.5% Max |
Physical Properties
Property |
Value |
Density |
0.318 lb/in³ |
Ultimate Tensile Strength |
45 ksi |
Yield Tensile Strength |
34.8 ksi |
Shear Strength |
33.4 ksi |
Shear Modulus |
6,380 ksi |
Hardness (Rockwell) |
B42 |
Hardness (Brinell) |
76 |
Elongation at Break Percentage |
25% |
Modulus of Elasticity |
16,700 ksi |
Poisson's Ratio |
0.31 |
Machinability Percentage |
20% |
Melting Point |
1,870-1,913 °F |
Specific Heat |
8.99 x 10^-2 BTU/lb-°F |
Thermal Conductivity |
1310 BTU-in/hr-ft²-°F |
Electrical Conductivity |
44% IACS |
Mechanical Properties
Property |
Value |
Ultimate Tensile Strength (UTS) |
90 ksi (620 MPa) |
Yield Strength (0.2% offset) |
40 ksi (276 MPa) |
Elongation (in 4D) |
25% |
Reduction of Area |
50% |
Hardness (Rockwell) |
B70 |
Hardness (Brinell) |
150 HB |
Modulus of Elasticity |
16,700 ksi (115 GPa) |
Shear Strength |
33.4 ksi (230 MPa) |
Fatigue Strength |
20 ksi (138 MPa) |
Thermal Properties
Property |
Value |
Melting Point |
1,870 - 1,913 °F |
Specific Heat |
0.0899 BTU/lb-°F |
Thermal Conductivity |
1,310 BTU-in/hr-ft²-°F |
Fabrication Properties
Property |
Value |
Soldering |
Excellent |
Brazing |
Excellent |
Oxyacetylene Welding |
Good |
Gas Shielded Arc Welding |
Good |
Coated Metal Arc Welding |
Not Recommended |
Spot Welding |
Fair |
Seam Welding |
Not Recommended |
Butt Welding |
Good |
Cold Working Capacity |
Excellent |
Hot Forming Capacity |
Fair |
Machinability Rating |
30 |
Common Applications
Common Applications of Commercial Bronze Copper Alloy (CDA 220):
- Electrical connectors and terminals
- Decorative hardware and architectural elements
- Springs and fasteners
- Electrical switch components
- Plumbing fittings
- Musical instruments
- Medal and coin production
- Heat exchanger tubing
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