C63200

C63200, also known as Nickel Aluminium Bronze, is a high-performance copper-based alloy combining strength, toughness, and excellent seawater corrosion resistance. It is widely used in marine, aerospace, and heavy engineering components.

Chemical Composition

• Copper (Cu): 78.8 – 82.6%

• Aluminium (Al): 8.7 – 9.5%

• Nickel (Ni): 4.0 – 4.8%

• Iron (Fe): 3.5 – 4.3%

• Manganese (Mn): 1.2 – 2.0%

• Silicon (Si): Up to 0.10%

• Lead (Pb): Max 0.02%

• Other residuals: Up to 0.5%

Mechanical Properties (Annealed, Typical Values)

• Tensile Strength: 90–107 ksi (621–738 MPa)

• Yield Strength (0.2%): 50–56 ksi (345–386 MPa)

• Elongation: 15–25%

• Hardness: 190–230 HB

Physical Properties

• Density: 7.64 g/cm³

• Melting Range: 1905–1940°F (1046°C)

• Electrical Conductivity: 7% IACS

• Thermal Conductivity: 20–36 W/m·K (Btu/sq ft/ft/hr/°F: 20 at 68°F)

• Coefficient of Thermal Expansion: 9 x 10⁻⁶ /°C (68–572°F)

• Modulus of Elasticity: 44 GPa

Fabrication and Joining

• Fair for soldering and brazing

• Excellent for gas-shielded arc welding, good for coated metal arc welding

• Good hot forming; fair for cold working

• Forgeability rating: 70

• Machinability rating: 30% (relative to free-cutting brass)

Key Features and Applications

• Superior resistance to corrosion, erosion, and cavitation in seawater

• High mechanical strength and toughness

• Low magnetic permeability

• Retains properties across a wide temperature range

• Used for marine fasteners, valve assemblies, drive shafts, sleeve bearings, bushings, weapon components, and pump bodies in seawater and chemical environments