LEADED COMMERCIAL

ASTM B 140 C31400:

ASTM standard specifying the composition and mechanical properties for leaded commercial bronze alloys.

Properties:

1. Corrosion Resistance:
• Good resistance to corrosion in various environments, including industrial atmospheres.
• Not as resistant to seawater corrosion compared to other bronzes.
Mechanical Properties:
• Tensile Strength: Typically around 310-380 MPa.
• Yield Strength: Approximately 110-220 MPa.
• Elongation: Generally around 20-35%, indicating good ductility
• Hardness: High hardness, with a typical Brinell hardness number (HB) of around 80-120.
Wear Resistance:
• Moderate wear resistance, suitable for applications involving moderate friction and mechanical stress.
Machinability:
• Excellent machinability due to the presence of lead, which acts as a lubricant and reduces friction during machining.
• Can be easily cast, forged, and worked to various shapes.
Thermal and Electrical Conductivity:
• Good thermal conductivity, suitable for heat exchangers and electrical applications.
• Moderate electrical conductivity, sufficient for many industrial uses but lower than pure copper.

Applications:

Bearings and Bushings: Extensively used in the production of bushings and bearings due to its good machinability and moderate wear resistance.
Automotive Parts: Commonly used in automotive parts such as gears, connectors, and fasteners due to its ease of machining and good mechanical properties.
Valves and Fittings: Suitable for manufacturing valves and fittings that require good machinability and moderate corrosion resistance.
Industrial Equipment:Used in various industrial equipment parts, including pump components, gears, and machine parts.