CZ128

CZ128 is a forging brass alloy also known as CW608N in European standards. It is recognised for its high copper content and excellent malleability and hot-forming capabilities. The alloy is used for complex forged parts where a combination of ductility, strength, and machinability is needed.

Chemical Composition

• Copper (Cu): 58.5 – 61.0%

• Lead (Pb): 1.5 – 2.5%

• Iron (Fe): Up to 0.3%

• Zinc (Zn): Balance

Mechanical and Physical Properties

• Tensile Strength: Approximately 380 to 550 MPa, depending on temper

• Yield Strength: Around 180 to 450 MPa

• Elongation: 10% to 35%

• Hardness: Around 110 to 150 Brinell Hardness Number

• Density: Approximately 8.44 g/cm³

• Thermal Conductivity: Around 120 W/m·K

• Melting Point: About 875 °C

• Coefficient of Thermal Expansion: Approximately 20.9 x 10⁻⁶ /°C

Fabrication and Applications

• Excellent hot forming capabilities with limited cold formability

• Good machinability relative to other leaded brasses

• Ideal for hot forging, stamping, and pressure forming

• Used in automotive parts, valve components, and forged fittings