CW624N

CW624N is a leaded brass alloy commonly designated as CZ130, also known as CuZn43Pb2Al. It is a duplex (alpha-beta phase) brass with added aluminium for improved strength and tarnish resistance.

Chemical Composition

• Copper (Cu): 55.00% - 57.00%

• Zinc (Zn): Balance (~38-43%)

• Lead (Pb): 1.60% - 3.00%

• Aluminium (Al): 0.05% - 5.00%

• Minor trace elements like iron and tin may be present

Mechanical Properties

• Tensile Strength: 350 - 420 MPa

• Proof Stress: 150 - 220 MPa

• Elongation: 20 - 30%

• Hardness (Vickers): 90 - 120 HV

Physical Properties

• Density: 8.44 g/cm³

• Melting Point: Approximately 890 °C

• Thermal Conductivity: 109 W/m·K

• Electrical Conductivity: About 16.4 MS/m

Fabrication and Machinability

• Very good machinability (~90% relative to CZ121/CW614N)

• Excellent hot workability, suitable for hot extrusion and forming complex profiles

• Poor to fair cold workability

• Excellent soldering and brazing capabilities

• Welding is not recommended except for limited types

• Good corrosion resistance and tarnish resistance due to aluminium content

Typical Uses

• Architectural profiles such as handrails, angles, channels, and decorative trims

• Plumbing fittings, fasteners, and machine parts requiring machinability and strength

• Electrical and consumer appliance components