CZ131

CZ131 is a brass alloy also known by the designations CW606N, UNS C35300, or ISO CuZn37Pb2. It is an alpha/beta brass alloy with a chemical composition designed to balance machinability, strength, and ductility.

Chemical Composition

• Copper (Cu): 61.0% – 63.0%

• Lead (Pb): 1.7% – 2.8%

• Iron (Fe): Up to 0.1% - 0.2%

• Aluminium (Al): Up to 0.05%

• Nickel (Ni): Up to 0.3%

• Tin (Sn) and Manganese (Mn): Trace amounts, each up to 0.1%

• Zinc (Zn): Balance (approximately 33-38%)

Mechanical Properties

• Ultimate Tensile Strength (UTS): 340 – 480 MPa

• Proof Stress: 200 – 350 MPa

• Elongation: 8% – 20%

• Hardness (Brinell): Max 140 HB

Physical Properties

• Density: About 8.5 g/cm³

• Melting Point: Approximately 885°C

• Modulus of Elasticity: 105 GPa

• Electrical Resistivity: 0.66 x 10⁻⁶ Ω.m

• Thermal Conductivity: Around 115 W/m.K

Fabrication and Machinability

• Machinability rating: Around 70-90% relative to free machining brass CZ121/CW614N (100%)

• Good soldering and brazing capability

• Fair for butt welding, but other welding methods are not recommended

• Fair cold working and poor hot forming

• Can be annealed by rapid cooling after heating to 430–600°C

Common Uses

• Nuts, rivets, screws, and other headed components

• Builders' hardware, plumbing fittings, faucet seats

• Instrument parts, including clock and watch components

• Battery terminals, hose fittings, fasteners

• Automotive and domestic appliances parts