C47940

C47940 is a naval brass alloy characterised by an increased amount of lead and tin to improve machinability, corrosion resistance, and strength at elevated temperatures. It is widely used in marine and industrial applications where strength and resistance to stress corrosion are required.

Chemical Composition

• Copper (Cu): 63.0 – 66.0%

• Zinc (Zn): 28.1 – 34.6%

• Tin (Sn): 1.2 – 2.0%

• Lead (Pb): 1.0 – 2.0%

• Iron (Fe): 0.1 – 1.0%

• Nickel (Ni): 0.1 – 0.5%

• Other elements: Up to 0.4%

Mechanical Properties

• Tensile Strength (Ultimate): 380 – 520 MPa

• Yield Strength (Proof): 160 – 390 MPa

• Elongation: 14 – 34%

• Shear Strength: 250 – 310 MPa

• Modulus of Elasticity: ~100 GPa

Physical and Thermal Properties

• Density: Around 8.2 g/cm³

• Melting Range: 800 – 850 °C

• Thermal Conductivity: 110 W/m-K

• Thermal Expansion: 20 µm/m-K

• Specific Heat Capacity: 380 J/kg-K

• Excellent resistance to stress corrosion, heat, and wear

Applications

• Marine hardware and structural components

• Bearing parts

• Components exposed to elevated temperature and stress

• Suitable for applications requiring high strength and corrosion resistance