CW307G

CW307G, also known as CA104 or CuAl10Ni5Fe4, is a complex nickel aluminium bronze alloy. It combines high strength, excellent corrosion resistance, and durability, making it widely used in marine, industrial, and high-performance engineering applications.

Chemical Composition

• Copper (Cu): Balance (~76% – 83%)

• Aluminum (Al): 8.5% – 11%

• Nickel (Ni): 4% – 6%

• Iron (Fe): 3% – 5%

• Manganese (Mn): Up to 1%

• Zinc (Zn): Up to 0.4%

• Silicon (Si): Up to 0.2%

• Lead (Pb): Up to 0.05%

• Tin (Sn): Up to 0.1%

• Other impurities: Up to 0.2%

Mechanical Properties

• Tensile Strength: 600 – 760 MPa

• Proof Stress: 400 – 530 MPa

• Elongation: 5% – 15%

• Hardness (Vickers): 170 – 220 HV

Physical Properties

• Density: ~7.58 g/cm³

• Melting Point: ~1035°C

• Thermal Conductivity: 37.7 W/m·K

• Electrical Resistivity: 0.172 x 10^-6 ohm.m

• Modulus of Elasticity: 115 GPa

Fabrication and Uses

• Good resistance to wear, shock, and abrasion

• Excellent corrosion resistance, especially in marine and seawater conditions

• Good weldability with common welding methods

• Machinability is relatively poor (rated about 30 compared to free-machining brasses)

• Commonly used for valve and pump components, marine hardware, bearings, gears, and aerospace parts