Phosphros Bronze

Phosphor Bronze is a type of bronze alloy that includes a small amount of phosphorus. The addition of phosphorus enhances the alloy’s strength, hardness, and corrosion resistance while maintaining good machinability and ductility. Phosphor Bronze is commonly used in applications that require high mechanical properties and excellent wear resistance.

Composition:

Copper (Cu): Typically 89-95%
Tin (Sn): 1-10%
Phosphorus (P): 0.01-0.35%
Other elements: May include small amounts of zinc (Zn), lead (Pb), and iron (Fe).

Grades

C67300 / C67500 / C66800 / C67400 / C67600 / C86200 / C67000:

ASTM standards specifying the composition and mechanical properties for different grades of phosphor bronze.

BS 1400/ HTB-3:

British Standard specifying the requirements for high-tensile phosphor bronze alloys.

Properties:

Corrosion Resistance:
- Excellent resistance to corrosion in various environments, including seawater and industrial atmospheres.
- Resistant to stress corrosion cracking.
Mechanical Properties:
- Tensile Strength: Typically around 350-800 MPa.
- Yield Strength: Approximately 150-400 MPa.
- Elongation: Generally around 10-20%, indicating good ductility.
- Hardness: Moderate to high hardness, with a typical Brinell hardness number (HB) of around 100-300.
Wear Resistance:
- Superior wear resistance, suitable for applications involving heavy loads and friction.
- Good anti-galling properties, ideal for bearings and bushings.
Machinability:
- Good machinability, allowing for the manufacturing and machining of complex components.
- Can be cast, forged, and worked to various shapes.
Thermal and Electrical Conductivity:
- Good thermal conductivity, suitable for heat exchange applications.
- Moderate electrical conductivity, sufficient for many industrial uses but lower than pure copper.

Applications:

Bearings and Bushings: Extensively used in the production of bearings and bushings due to its superior wear resistance and low friction properties.
Spring and Electrical Contacts: Commonly used in electrical contacts and springs due to its good conductivity and mechanical properties.
Marine Hardware: Suitable for marine hardware such as propellers, pumps, and valves due to its excellent corrosion resistance.
Industrial Equipment: Used in various industrial equipment parts, including gears, connectors, and fasteners.
Aerospace and Defense: Employed in the aerospace and defense industries for components requiring high strength and corrosion resistance.