The Brinell hardness scale is used to compare soft as well as hardened metals. A 10mm hardened steel ball is forced into a test specimen using a 3000 kg load. The load is maintained for a short period of time and the specimen is removed from the machine. An eyepiece instrument with a graduated scale in millimeters is used to measure the width of the indentation. The chart shown compares Brinell hardness to Rockwell B and C scales.
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