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The Rockwell hardness test is the most used and versatile of the hardness tests. For soft materials such as copper alloys, soft steel, and aluminum alloys a 1/16 diameter steel ball is used with a 100-kilogram load and the hardness is read on the B scale.
RC is hardness on the Rockwell C scale. There are multiple Rockwell Hardness scales for different things. I believe the the scale is based on how far a penetrator will go into a material given a certain load. 60s are kinda high and some steels can start to embrittle.