CZ122

CZ122, also known as CW617N, is a free-machining stamping brass alloy with excellent hot forming properties and high machinability. It is widely used for producing complex hot-pressed components and is mainly supplied as bar stock for forging, although it is also suitable for free machining. The sheet equivalent grade of CZ122 is CZ120.

Chemical Composition

• Copper (Cu): 56.0 – 58.5%

• Lead (Pb): 1.5 – 2.5%

• Iron (Fe): Up to 0.3%

• Zinc (Zn): Remainder

• Total impurities: Maximum 0.7%

Mechanical and Physical Properties

• Tensile Strength: Approximately 380 - 550 MPa

• Yield Strength: Approximately 180 - 450 MPa

• Elongation: 10 - 35%

• Hardness: 110 - 150 Brinell Hardness Number

• Density: 8.4 g/cm³

• Melting Point: Around 895°C

• Electrical Conductivity: 27% IACS

• Thermal Conductivity: 117 W/m·K

• Thermal Expansion Coefficient (20 - 200°C): 20 x 10⁻⁶ /°C

Fabrication Characteristics

• Hot forming temperature range: 650 - 775°C, excellent hot formability

• Cold formability: Limited

• Machinability rating: Approximately 85% (compared to free cutting brass at 100%)

• Soldering: Excellent

• Brazing: Good

• Welding: Generally not recommended, fair for butt welding

Typical Applications

• Automotive components

• Precision machined parts

• Hot forged and pressed components

• Valve parts

• Architectural hardware

• Specialty fasteners