CW706R

CW706R is a dezincification-resistant brass alloy also known as Admiralty Brass. It has a pure alpha structure and excellent cold working properties, making it well-suited for applications in warm, acidic, and marine environments.

Chemical Composition

• Copper (Cu): 70% – 73%

• Zinc (Zn): 25.2% – 29.1%

• Tin (Sn): 0.9% – 1.2%

• Arsenic (As): 0.02% – 0.06%

• Lead (Pb): Up to 0.07%

• Iron (Fe): Up to 0.06%

• Other impurities: Up to 0.4%

Mechanical Properties

• Tensile Strength: Around 350 MPa

• Yield (Proof) Strength: About 120 MPa

• Elongation: Minimum 45%

• Hardness: Approximately 130 HB (Brinell)

Physical & Thermal Properties

• Density: Approximately 8.5 g/cm³

• Thermal Conductivity: Approximately 110 W/m·K

• Electrical Conductivity: Around 28% IACS

• Thermal Expansion: 20 μm/m-K

• Melting Range: Solidus ~900 °C, Liquidus ~940 °C

Key Features and Fabrication

• Excellent resistance to dezincification and corrosion in marine and acidic environments

• Good formability with high strength and ductility

• Suitable for soldering and brazing, but not recommended for welding

• Machinability is moderate at about 25-30% compared to free-cutting brasses

• Commonly used in heat exchangers, condensers, chemical processing, and marine hardware