Bronze is a metal alloy composed primarily of two metals:
1. Copper
2. Tin
However, certain types of bronzes feature other metals. One common addition is lead. High leaded tin bronze alloys are chosen for several reasons. Industrial concerns regard bronze favorably for its high thermal conductivity and free cutting qualities. The addition of lead into the mix provides the alloy with good lubricity. The combination imparts a durability that protects the surface of the component they cover from wear.
Types and Applications
This type of bronze alloy comes in various types or classifications. The list includes:
* C93400
* C93500
* C93600
* C93900
* C94000
* C94300
However, the most commonly offered by suppliers and manufacturers are C93200 (SAE 660) and C93800 high leaded tin bronze (SAE 67).
C93200 (SAE 660, ASTM B584) is a bearing bronze. This is the standard metal alloy for diverse applications requiring light duty such as bearings and bushings. Properties include:
* Easy machinability
* Durability
* Strength
* Wear resistant
* Less dependent upon lubrication
* Good marine corrosion resistance
C93800 is also a common high leaded tin bronze. It is popular for certain marine applications e.g. bearings for ships as well as a variety of other uses involving moderate pressures. In industry, this alloy offers high machinability, corrosion resistance to acid and marine elements as well as high friction and wear resistant properties. Applications include:
* Industrial centrifuges
* Material for rod bushings, wedges, and shoes
* Pump impellers and bodies for Acid Mine Water
* Freight car bearings
In fact, when it comes to railroad cars – freight and passenger alike, C93800 is excellent for such things as bearings, bushings and other machine parts.
High Leaded Tin Bronze
In general, companies find multiple uses for the varieties of high leaded tin bronze available from suppliers and manufacturers. These alloys provide excellent performance where the environments are harsh. In particular, they are ideal where foreign matter may be present, or a high potential exists for a loss of a lubrication boundary.