Bronze is a family of alloys that primarily consists of copper and tin, with other elements added to enhance specific properties. Each type of bronze has unique characteristics that make it suitable for different applications. Here’s a more detailed overview of the various types of bronze bearings you mentioned:

1. Bronze SAE660: This is a high-strength, high-ductility bronze that is often used for its fatigue resistance and ability to withstand high loads. It is typically used in applications where high strength and wear resistance are required.

2. Leaded (Tin) Bronze C93200: This bronze contains lead, which acts as a solid lubricant. It has excellent machinability and is often used in applications where self-lubrication is needed, such as in automotive and marine components.

3. Phosphor Bronze PB1: Phosphor bronze is known for its excellent electrical and thermal conductivity, as well as its corrosion resistance. PB1 is a type of phosphor bronze that is often used in electrical contacts and connectors due to its springiness and resistance to tarnishing.

4. Leaded Bronze LB2: This bronze alloy contains lead, which enhances its machinability and provides a self-lubricating effect. It is commonly used in bearings and bushings where a low coefficient of friction is desired.

5. Leaded Bronze LB4: Similar to LB2, LB4 is a leaded bronze with a higher lead content, which can improve its lubricity and machinability even further. It is often used in applications with heavy loads or where a high degree of wear resistance is required.

6. Phosphor Bronze PB2: This is another type of phosphor bronze with a higher phosphorus content, which can improve the alloy’s hardness and strength. It is often used in applications where a combination of electrical conductivity and mechanical strength is needed.

7. Aluminium Bronze BS2874: Aluminium bronzes are known for their high strength and resistance to corrosion, especially in seawater. BS2874 is a specific grade that is often used in marine applications and for components that will be exposed to saltwater or other corrosive environments.

8. Aluminium Bronze CA104: This is a high-strength aluminium bronze with good corrosion resistance. It is often used in high-stress applications where a combination of strength and corrosion resistance is required.

9. Aluminium Bronze NES833: This is a high-alloy aluminium bronze with excellent mechanical properties and corrosion resistance. It is often used in applications that require high strength and resistance to seawater and other corrosive environments.

10. Aluminium Bronze C63000: This is a general-purpose aluminium bronze with good strength and corrosion resistance. It is often used in marine applications and for components that will be exposed to corrosive environments.

11. Aluminium Bronze 63200: Similar to C63000, this is another grade of aluminium bronze that is known for its good mechanical properties and corrosion resistance. It is often used in applications where a combination of strength and corrosion resistance is needed.

Bearings made from these bronze alloys can be manufactured through various casting methods, including centrifugal casting and continuous casting. Centrifugal casting is a process where molten metal is poured into a rotating mold, which helps to distribute the material evenly and create a denser, more uniform structure. Continuous casting, on the other hand, involves pouring molten metal into a continuously moving mold, which allows for the production of long, continuous lengths of material.

The choice of casting method and bronze alloy will depend on the specific requirements of the application, including factors such as load capacity, speed, temperature, and environmental conditions. Each type of bronze bearing offers unique benefits and is chosen based on the specific needs of the application it will be used in.