52100 is a high carbon steel used primarily for ball bearings. It has a good amount of carbon and very few other alloys. Ball bearing steels usually have to withstand a great deal of force in a very small area. Traditionally, ball bearing steels make good edge steels because an edge also has to withstand much force in a small area. 52100 serves that function well. Oil quenched and drawn to Rc 62, it is a difficult steel to heat treat. A very fine molecular structure permits very sharp edges, even at thin angles.
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