CC493K

CC493K is a leaded bearing bronze alloy, commonly known as RG7 or CuSn7Zn4Pb7-C, specified under EN 1982. It is designed for good machinability, wear resistance, and corrosion resistance.

Chemical Composition (Weight %)

• Copper (Cu): 81.0 – 86.0%

• Tin (Sn): 5.2 – 8.0%

• Lead (Pb): 5.0 – 8.0%

• Zinc (Zn): 2.0 – 5.0%

• Nickel (Ni): Up to 2.0%

• Aluminium (Al), Phosphorus (P), Sulfur (S), Silicon (Si), Antimony (Sb): Trace amounts

Mechanical Properties

• Tensile Strength (Ultimate): Approximately 230 – 260 MPa

• Yield Strength (0.2% Proof): Around 140 – 160 MPa

• Elongation at Break: Around 12 – 14%

• Brinell Hardness: Approx. 65 – 74 HB

Physical Properties

• Density: ~8.7 g/cm³

• Good corrosion resistance, including to seawater

• Suitable for dry running and pressure-tight applications

Applications

• Plain bearings and bearing bushings

• Sliding parts and gear components

• Valve and pump housings

• Steam fittings and general machinery parts

Key Features

• Excellent machinability due to high lead content

• Good wear resistance and sliding characteristics

• Effective pressure tightness for bearing applications

• Moderate strength and good corrosion resistance in marine environments