10% Copper Nickel Copper Alloy - CDA 706
10% Copper Nickel Copper Alloy (CDA 706) is a copper-nickel alloy containing approximately 10% nickel, known for its excellent corrosion resistance, especially in marine environments, as well as its good strength and thermal conductivity. This alloy is widely used in applications that require resistance to seawater and other harsh environments.
Chemical Composition
Element |
Composition (%) |
Copper (Cu) |
88.0-90.0 |
Nickel (Ni) |
9.0-11.0 |
Iron (Fe) |
1.0-1.8 |
Manganese (Mn) |
0.5-1.0 |
Zinc (Zn) |
0.5 max |
Lead (Pb) |
0.03 max |
Carbon (C) |
0.05 max |
Sulfur (S) |
0.05 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 |
Electrical Resistivity |
19.1 μΩ·in |
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 of 10% Copper Nickel Copper Alloy (CDA 706) include:
- Marine Hardware: Used in fittings, valves, and fasteners that are exposed to seawater.
- Shipbuilding: Components such as pipes, tubing, and hull fittings for ships and boats.
- Heat Exchangers: Employed in marine and industrial heat exchangers due to its corrosion resistance and thermal properties.
- Desalination Plants: Utilized in components that handle seawater and brine solutions.
- Electrical Connectors: Suitable for connectors in marine electrical systems, providing good conductivity and corrosion resistance.
- Piping Systems: Ideal for seawater piping systems in naval applications.
- Offshore Platforms: Used in structures and equipment on offshore oil and gas platforms.
- Valves and Pumps: Components that require durability and resistance to corrosive environments.
- Instruments and Gauges: Employed in marine instrumentation where exposure to corrosive elements is a concern.
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