CW306G

CW306G is a high-strength aluminium bronze alloy, also designated as CuAl10Fe3Mn2. It is characterised by its excellent corrosion resistance, fatigue strength, and mechanical properties, particularly at elevated temperatures up to about 300°C.

Chemical Composition

• Copper (Cu): Remainder (~84-88%)

• Aluminium (Al): 9.0 – 11.0%

• Iron (Fe): 2.0 – 4.0%

• Manganese (Mn): 1.5 – 3.5%

• Nickel (Ni): Up to 1.0%

• Lead (Pb): Up to 0.05%

• Zinc (Zn): Up to 0.5%

• Silicon (Si): Up to 0.2%

• Tin (Sn): Up to 0.1%

Mechanical Properties (Typical at 20°C)

• Tensile Strength (Rm): 560 – 690 MPa

• Yield Strength (Rp0.2): 330 – 510 MPa

• Elongation (A5): 6 – 12%

• Brinell Hardness (HB): 140 – 180

• Modulus of Elasticity: Approx. 120 GPa

Physical Properties

• Density: 7.6 g/cm³

• Thermal Conductivity: 54 W/m·K

• Electrical Conductivity: 6 MS/m

• Thermal Expansion (20-300°C): 16 × 10⁻⁶ /°C

Fabrication and Use

• Excellent corrosion resistance to seawater and acidic solutions

• Good scaling resistance at higher temperatures

• Suitable for gas shielded arc welding and resistance welding

• Machinability: About 50% (relative to free-cutting brass)

• Used for marine components, chemical industry parts, nuts, bolts, bushings, bearings, and construction parts