30% Copper Nickel Copper Alloy - CDA 715
30% Copper Nickel Copper Alloy (CDA 715) is a copper-nickel alloy consisting of approximately 30% nickel, known for its exceptional corrosion resistance, particularly in seawater, as well as high strength and good ductility. This alloy is commonly used in marine applications and industries that require reliable performance in harsh environments.
Chemical Composition
Element |
Composition (%) |
Copper (Cu) |
69.0-71.5 |
Nickel (Ni) |
29.0-33.0 |
Iron (Fe) |
0.4-1.0 |
Manganese (Mn) |
1.0 max |
Lead (Pb) |
0.05 max |
Zinc (Zn) |
1.0 max |
Carbon (C) |
0.05 max |
Sulfur (S) |
0.05 max |
Physical Properties
Property |
Value |
Density |
0.323 lb/in³ (8.94 g/cm³) |
Melting Range |
2140-2260°F (1171-1238°C) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Electrical Conductivity |
4.6% IACS |
Thermal Conductivity |
17 Btu/ft²/ft·h·°F (29 W/m·K) |
Coefficient of Thermal Expansion |
9.0 × 10⁻⁶ in/in/°F (16.2 × 10⁻⁶ m/m/°C) |
Mechanical Properties
Property |
Value |
Tensile Strength |
54,000-75,000 psi (372-517 MPa) |
Yield Strength |
20,000-70,000 psi (138-483 MPa) |
Elongation |
15-45% |
Hardness |
35-80 Rockwell B |
Modulus of Elasticity |
22,000 ksi (152 GPa) |
Shear Modulus |
8,300 ksi (57.2 GPa) |
Poisson's Ratio |
0.325 |
Thermal Properties
Property |
Value |
Melting Range |
2140-2260°F (1171-1238°C) |
Thermal Conductivity |
17 Btu/ft²/ft·h·°F (29 W/m·K) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Coefficient of Thermal Expansion |
9.0 × 10⁻⁶ in/in/°F (16.2 × 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 |
Excellent |
Brazing |
Excellent |
Oxyacetylene Welding |
Good |
Gas Shielded Arc Welding |
Excellent |
Resistance Welding - Spot and Seam |
Good |
Resistance Welding - Butt |
Good |
Common Applications
Common applications for 30% Copper Nickel Copper Alloy (CDA 715) include:
- Marine Hardware: Used for critical components such as valves, fittings, and fasteners in marine environments.
- Shipbuilding: Employed in piping systems, hull fittings, and other structural components in vessels.
- Heat Exchangers: Ideal for use in seawater heat exchangers due to its corrosion resistance and thermal conductivity.
- Desalination Facilities: Components in desalination plants where seawater is processed.
- Oil and Gas Industries: Utilized in offshore platforms and subsea equipment that require corrosion resistance.
- Pumps and Compressors: Suitable for parts that handle corrosive fluids in various industrial applications.
- Electrical Applications: Used for connectors and terminals in marine electrical systems for reliable performance.
- Instrumentation: Components in gauges and sensors exposed to seawater or corrosive environments.
- Pressure Vessels: Employed in pressure vessels designed for marine and industrial applications requiring durability.
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