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  10. Rockwell scale - Wikipedia

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  12. COMMON PROBLEMS IN ROCKWELL HARDNESS

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  25. Is mid-30's Rockwell too hard? - practicalmachinist.com

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    Rockwell Hardness Testers. How they are used and which model type is best for you? The Rockwell Hardness Scale is used to rank the hardness of materials, and it is widely used in the fields of metallurgy and engineering. The Rockwell test uses indentation to test the hardness of a material.

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