CW608N

CW608N, also known as CZ120 or C38500, is an alpha-beta free-machining brass alloy with about 2% lead content, which gives it excellent machinability. It is primarily used in the manufacture of machine-engraved nameplates, signs, door furniture, window fittings, valve parts, and decorative metalwork.

Chemical Composition

• Copper (Cu): 55.0 – 59.0%

• Zinc (Zn): 36.7 – 42.5%

• Lead (Pb): 2.5 – 3.5%

• Iron (Fe): 0 – 0.35%

• Others: Up to 0.5%

Mechanical Properties

• Tensile Strength: Approximately 370 MPa

• Yield Strength: Approximately 130 MPa

• Elongation: Around 17%

• Hardness: 50 – 75 HB

Physical Properties

• Density: About 8.1 g/cm³

• Electrical Conductivity: Around 28% IACS

• Thermal Conductivity: Approximately 120 W/m·K

• Melting Point: Around 880 to 890°C

• Thermal Expansion Coefficient: About 21 µm/m-K

Fabrication and Applications

• Excellent free-machining properties due to uniform lead distribution

• Good corrosion resistance suitable for decorative and architectural uses

• Excellent hot formability, but not suitable for acid etching due to the duplex structure

• Suitable for soldering, brazing, and some welding (limited)

• Widely used in precision machining industries and architectural hardware