CW301G

CW301G is a copper-aluminium-silicon-iron alloy, also known as CuAl6Si2Fe or UNS C64200. It is a silicon-aluminium bronze notable for its strength, corrosion resistance, and good wear resistance, widely used in marine and industrial applications.

Chemical Composition

• Copper (Cu): 88.2 – 92.2%

• Aluminium (Al): 6.3 – 7.6%

• Silicon (Si): 1.5 – 2.2%

• Iron (Fe): 0 – 0.3%

• Zinc (Zn), Nickel (Ni), Tin (Sn), Arsenic (As), Manganese (Mn), Lead (Pb): Present in trace amounts or very low amounts

Mechanical Properties

• Tensile Strength: 540 – 640 MPa

• Yield Strength: 230 – 320 MPa

• Elongation: 14 – 35%

• Brinell Hardness: 120 HB (typical)

Physical Properties

• Density: 8.3 g/cm³

• Thermal Conductivity: Approx. 45 W/m·K

• Electrical Conductivity: Around 8% IACS

• Melting Range: Solidus ~980°C, Liquidus ~1000°C

• Coefficient of Thermal Expansion: Approx. 18 µm/m·K

Applications

• Marine parts such as pumps and valve components, shafts, and propellers

• Chemical industry components exposed to corrosive environments

• Bearings, bushings, fasteners, and structural components requiring strength and corrosion resistance

Additional Notes

• Good welding and brazing capabilities

• Suitable for hot working and cold forming

• Fair machinability with around 40% of free-machining brass rating