CZ126

CZ126 is a brass alloy equivalent to CW707R, also known as Admiralty Brass. This alloy contains roughly 70% copper and 30% zinc with a small addition of arsenic to enhance corrosion resistance.

Chemical Composition

• Copper (Cu): 68.5% to 71.5%

• Zinc (Zn): Balance (about 28.5% to 31.5%)

• Arsenic (As): 0.02% to 0.06%

• Lead (Pb): Up to 0.07%

• Iron (Fe): Up to 0.05%

• Other impurities: Up to 0.20%

Mechanical Properties

• Tensile strength: Approximately 340-400 MPa

• Proof stress: Minimum 130 MPa

• Elongation: Minimum 45%

• Hardness: Around 130 HB (Brinell Hardness)

Physical Properties

• Density: 8.55 g/cm³

• Electrical conductivity: Approximately 28% IACS

• Thermal conductivity: Near 120 W/m·K

• Coefficient of thermal expansion: 19.7 × 10⁻⁶ /°C

• Melting range: 910 to 965°C

Applications and Fabrication

• Excellent corrosion resistance in marine, acidic, and sub-sea environments

• High strength combined with good formability and ductility

• Suitable for heat exchanger tubes, condensers, marine hardware, chemical processing equipment, and steam turbines

• Machinability rating at about 25% relative to free-cutting brass