18% Nickel Copper Alloy - CDA 752
18% Nickel Copper Alloy (CDA 752) is a copper-nickel alloy containing approximately 18% nickel, recognized for its outstanding corrosion resistance, excellent mechanical properties, and high strength, particularly in marine environments. This alloy is widely used in applications where durability and resistance to seawater and other harsh conditions are critical.
Chemical Composition
Element |
Composition (%) |
Copper (Cu) |
79.0-82.0 |
Nickel (Ni) |
17.0-19.0 |
Iron (Fe) |
0.25-1.0 |
Manganese (Mn) |
1.0 max |
Zinc (Zn) |
0.5 max |
Lead (Pb) |
0.05 max |
Carbon (C) |
0.15 max |
Physical Properties
Property |
Value |
Density |
0.318 lb/in³ (8.80 g/cm³) |
Melting Range |
2100-2300°F (1149-1260°C) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Electrical Conductivity |
4% IACS |
Thermal Conductivity |
15 Btu/ft²/ft·h·°F (26 W/m·K) |
Coefficient of Thermal Expansion |
8.6 × 10⁻⁶ in/in/°F (15.5 × 10⁻⁶ m/m/°C) |
Mechanical Properties
Property |
Value |
Tensile Strength |
70,000-110,000 psi (483-758 MPa) |
Yield Strength |
30,000-90,000 psi (207-621 MPa) |
Elongation |
2-45% |
Hardness |
60-90 Rockwell B |
Modulus of Elasticity |
22,000 ksi (152 GPa) |
Shear Modulus |
8,300 ksi (57 GPa) |
Thermal Properties
Property |
Value |
Melting Range |
2100-2300°F (1149-1260°C) |
Thermal Conductivity |
15 Btu/ft²/ft·h·°F (26 W/m·K) |
Specific Heat |
0.09 Btu/lb/°F (377 J/kg·K) |
Coefficient of Thermal Expansion |
8.6 × 10⁻⁶ in/in/°F (15.5 × 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 |
Fair |
Gas Shielded Arc Welding |
Good |
Resistance Welding - Spot and Seam |
Good |
Resistance Welding - Butt |
Good |
Common Applications
Common applications for 18% Nickel Copper Alloy (CDA 752) include:
- Marine Hardware: Used for fittings, valves, and fasteners in seawater applications.
- Shipbuilding: Employed in piping systems, hull fittings, and structural components for vessels.
- Heat Exchangers: Ideal for marine and industrial heat exchangers due to its thermal conductivity and resistance to corrosion.
- Desalination Plants: Utilized in components that handle seawater and brine solutions.
- Oil and Gas Industry: Components for offshore platforms and subsea equipment requiring corrosion resistance.
- Pumps and Compressors: Suitable for parts that operate in corrosive environments and require high strength.
- Electrical Connectors: Used for connectors and terminals in marine electrical systems.
- Instrumentation: Employed in gauges, sensors, and other devices exposed to harsh conditions.
- Marine Propulsion Systems: Critical components in propeller shafts, rudders, and related systems.
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