10% Nickel Copper Alloy - CDA 740
10% Nickel Copper Alloy (CDA 740) is a copper-nickel alloy containing approximately 10% nickel, known for its excellent corrosion resistance, high strength, and good weldability. This alloy is particularly effective in marine environments, making it suitable for various applications requiring durability and resistance to seawater.
Chemical Composition
Element |
Composition (%) |
Copper (Cu) |
88.0-90.0 |
Nickel (Ni) |
9.0-11.0 |
Iron (Fe) |
1.0-1.8 |
Manganese (Mn) |
1.0 max |
Zinc (Zn) |
0.5 max |
Lead (Pb) |
0.02 max |
Carbon (C) |
0.05 max |
Sulfur (S) |
0.02 max |
Phosphorus (P) |
0.02 max |
Physical Properties
Property |
Value |
Density |
0.323 lb/in³ (8.94 g/cm³) |
Melting Range |
1996-2084°F (1091-1140°C) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Electrical Conductivity |
9% IACS |
Thermal Conductivity |
26 Btu/ft²/ft·h·°F (45 W/m·K) |
Coefficient of Thermal Expansion |
9.5 × 10⁻⁶ in/in/°F (17.1 × 10⁻⁶ m/m/°C) |
Mechanical Properties
Property |
Value |
Tensile Strength |
45,000-60,000 psi (310-414 MPa) |
Yield Strength |
15,000-45,000 psi (103-310 MPa) |
Elongation |
15-45% |
Hardness |
50-95 Rockwell B |
Modulus of Elasticity |
18,000 ksi (124 GPa) |
Shear Modulus |
6,700 ksi (46 GPa) |
Thermal Properties
Property |
Value |
Melting Range |
1996-2084°F (1091-1140°C) |
Thermal Conductivity |
26 Btu/ft²/ft·h·°F (45 W/m·K) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Coefficient of Thermal Expansion |
9.5 × 10⁻⁶ in/in/°F (17.1 × 10⁻⁶ m/m/°C) |
Fabrication Properties
Property |
Characteristic |
Capacity for Cold Working |
Excellent |
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 10% Nickel Copper Alloy (CDA 740) include:
- Marine Hardware: Used in fittings, valves, and fasteners exposed to seawater.
- Shipbuilding: Employed in piping systems and structural components in vessels.
- Heat Exchangers: Ideal for marine and industrial heat exchangers due to its corrosion resistance and thermal properties.
- Desalination Plants: Utilized in components that handle seawater and brine solutions.
- Pumps and Compressors: Components that require durability and resistance to corrosive environments.
- Electrical Connectors: Suitable for connectors and terminals in marine electrical systems due to good conductivity.
- Instrumentation: Used in gauges and sensors exposed to harsh environments.
- Offshore Oil and Gas Applications: Components in equipment on offshore platforms and subsea systems.
- Marine Propulsion Systems: Employed in critical components such as propeller shafts and rudder systems.
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