C65620

C65620 is a silicon bronze alloy, also known under specifications like AMS 4616 or Copper Alloy B (CuSi3Fe2Zn3). It is appreciated for its high strength, corrosion resistance, good fatigue endurance, and excellent brazing and welding abilities.

Chemical Composition (Approximate)

• Copper (Cu): ~90%

• Silicon (Si): 1.5 – 2.4%

• Iron (Fe): Up to 1.0%

• Manganese (Mn): 0.7 – 2.0%

• Zinc (Zn): About 1.0 – 4.0%

• Lead (Pb): Typically low, less than 0.05%

Mechanical Properties

• Tensile Strength: Approximately 480 MPa (70 ksi)

• Yield Strength (0.2% Offset): Around 220 MPa (32 ksi)

• Elongation (in 50 mm): About 30%

• Rockwell Hardness B Scale: Around 55

Physical Properties

• Density: About 8.75 g/cm³

• Melting Range: Around 1030 – 1060°C

• Modulus of Elasticity: About 117,000 MPa

• Excellent corrosion resistance similar to copper, but with added strength

• Electrical and thermal conductivities are moderate due to alloying elements

Key Features and Applications

• Excellent brazing and welding capabilities, including gas shielded arc welding

• Used in electrical conduit, motor and rotor bars, fasteners, hydraulic pressure lines, and heat exchanger tubes

• Good fatigue properties and resistance to oxidation and wear

• Suitable for marine hardware and industrial components where strength and corrosion resistance are essential