CW505L

CW505L, also known as CZ106 or Cartridge Brass, is an alpha brass alloy that contains approximately 69-71% copper and the remainder zinc with small amounts of other elements like nickel, tin, lead, and aluminium to enhance properties.

Chemical Composition

• Copper (Cu): 69.00% – 71.00%

• Zinc (Zn): Balance (~29-31%)

• Nickel (Ni): Up to 0.30%

• Tin (Sn): Up to 0.10%

• Lead (Pb): Up to 0.05%

• Aluminium (Al): Up to 0.02%

• Other impurities: Up to 0.10%

Mechanical Properties

• Tensile Strength: 270 – 480 MPa depending on temper and thickness

• Proof Stress: 90 – 430 MPa

• Elongation: 9% – 50%

• Hardness: Vickers 55 – 155 HV (varies by temper)

Physical Properties

• Density: 8.55 g/cm³

• Melting Point: Approximately 965°C

• Electrical Conductivity: 28% IACS

• Thermal Conductivity: ~121 W/m·K

• Thermal Expansion Coefficient: 19 x 10⁻⁶ /K

Fabrication Properties

• Excellent cold working and deep drawing properties

• Good corrosion resistance

• Used extensively in deep drawn and spun components, heat exchanger tubes, chemical processing parts, and fastenings

• Machinability rating about 30% relative to free cutting brass

• Suitable for soldering, brazing, welding (oxyacetylene and spot welding preferred)

Applications

• Electrical fittings and lamp holders

• Heat exchanger tubes

• Chains, fastenings, and chemical processing components

• Fire extinguishers and decorative hardware