What hardness tester should be used to test the hardness of cast iron?

Rockwell hardness testers can be used for the hardness testing of certain cast iron workpieces. While the HRB or HRF scales are often used for testing, it is preferable to use the HRE or HRK scales, as they utilize a 3.175mm diameter steel ball, which can provide better average readings than a 1.588mm diameter steel ball. For hard malleable cast iron materials, HRC is typically used; if the material is non-uniform, multiple data points can be measured and the average value taken.

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