what are bearing balls made of
BALL BEARING MATERIALS
There are essentially two choices for the material used in ball bearings - chrome steel or stainless steel. Since the material plays a major part in the performance of a bearing in any given application, it is very important that the correct material is used. Note that the specified material applies to the load bearing components only - the rings and the balls. The retainer and the shields (if used) are usually made from a different material and are subject to separate specification.
CHROME STEEL (AISI 52100 OR EQUIVALENT)
This is the standard material used for ball bearing applications where load capacity is the main consideration.
How it's made - Ball bearings
https://www.youtube.com/watch?v=41Z5v4NybWA
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