CZ121PB3

CZ121PB3 offers good corrosion resistance and high strength, combined with excellent hot formability. It is widely used in mass production for components where high output and long tool life are required and where no further cold forming after machining is necessary. The alloy is mainly used for high-speed machined components, fasteners, extruded sections, window frames, plug pins, switch blocks, and similar industrial parts.

Chemical Composition (approximate)

• Copper (Cu): 56.5 – 58.5%

• Lead (Pb): 2.5 – 3.5%

• Iron (Fe): Up to 0.3%

• Other impurities: Up to 0.7%

• Zinc (Zn): Balance (remainder)

Mechanical Properties (Typical)

• Tensile Strength: 360–580 MPa

• Elongation: 15–25%

• Hardness: 90–160 Brinell Hardness Number

• Density: Approximately 8.47 g/cm³

• Melting Point: Around 875°C (solidus)

Fabrication Characteristics

• Machinability rating: About 90 (where Alloy 360 brass is 100)

• Excellent soldering, good brazing

• Butt welding fair; other welding methods not recommended

• Cold working is not recommended; hot working is recommended between 630-730°C