CW612N

CW612N, also known as CuZn39Pb2 or forging brass C37700, is a free-cutting hot forging brass alloy with a high copper content and a significant lead addition to improve machinability. It is commonly used for parts that require extensive hot stamping followed by machining.

Chemical Composition (EN 12164:2016)

• Copper (Cu): 59.0 - 60.0%

• Lead (Pb): 1.6 - 2.5%

• Tin (Sn): ≤ 0.3%

• Iron (Fe): ≤ 0.3%

• Nickel (Ni): ≤ 0.3%

• Aluminium (Al): ≤ 0.05%

• Others (total): ≤ 0.2%

• Zinc (Zn): Remainder

Mechanical Properties

• Tensile Strength: 390 - 550 MPa

• Yield Strength: 180 - 450 MPa

• Elongation: 5% - 35%

• Hardness: 110 - 150 HB

Physical Properties

• Density: 8.44 g/cm³

• Electrical Conductivity: Approximately 23% IACS

• Thermal Conductivity: 120 W/m·K

• Thermal Expansion Coefficient: 20 x 10⁻⁶ /°C

• Melting Point: Around 895°C

Fabrication Characteristics

• Excellent machinability (around 85% relative to CuZn39Pb3)

• Fair cold workability

• Excellent hot workability, suitable for hot stamping

• Good soft soldering and fair brazing

• Welding is mostly not recommended, or limited to butt welding

Applications

• Hot-stamped and machined components

• Builder’s hardware

• Valve components

• Electrical fittings