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Rockwell hardness number

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Rockwell hardness number
A measure of Rockwell hardness; determined by use of a machine having an indentor which can be loaded; the number is derived from the net increase in depth of impression that the indentor makes in the material as the load on the indentor is increased from a fixed load to a higher load, and then returned to the minimum load.
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The Rockwell hardness number is a measure of the non-recoverable indentation after a heavy load of 588N for a period of 15s, and subsequently reduced to a minor load of 98N for another duration of 15 s.
Scratch Resistance of Mineral-Filled Polypropylene Materials by CHU, J.; XIANG, C.; SUE, H.-J.; HOLLIS, R. DAMON / Polymer Engineering and Science
A major load of 60,100 lb or 50 kg is then applied and released and the difference between the major and minor load is automatically registered by an indicator which reads directly the Rockwell hardness number.
Testing and inspection: the final step in assuring casting quality by Bex, Tom / Modern Casting
 
 
 
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