C4622

C4622 is a naval brass alloy widely recognised for its high ductility, excellent electrical and thermal conductivity, good creep resistance, and high impact strength. It is used in applications such as marine hardware, machine hardware, valve stems, and screw machine products, where both strength and corrosion resistance are critical.

Chemical Composition

• Copper (Cu): 61.00 – 64.00%

• Tin (Sn): 0.70 – 1.50%

• Iron (Fe): Up to 0.20%

• Lead (Pb): Up to 0.30%

• Zinc (Zn): Balance

Mechanical Properties

• Tensile Strength (UTS): Approximately 365 MPa (depending on form and size)

• Elongation: 20% minimum

• Hardness: Moderate to high, depending on treatment and size

Physical Properties

• Density: 8.44 g/cm³

• Melting Range: Solidus ~1630°F (888°C), Liquidus ~1650°F (899°C)

• Electrical Conductivity: Approximately 26% IACS

• Thermal Conductivity: Around 67 BTU/(ft²·hr·°F)

• Coefficient of Thermal Expansion: 11.8 × 10⁻⁶ /°F

• Specific Heat Capacity: 0.09 BTU/lb/°F

• Modulus of Elasticity: 15,000 ksi

• Modulus of Rigidity: 5,600 ksi

Fabrication and Applications

• Excellent soldering and good brazing capabilities

• Poor cold workability but excellent hot workability (forgeability rating 90)

• Limited welding capabilities

• Machinability rating around 50%

• Used in marine and industrial applications requiring strength, thermal/electrical conductivity, and corrosion resistance