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An intercomparison of measurements on the Rockwell B and Rockwell C scales has been carried out for the Community Bureau of Reference. The results of an earlier BCR-funded intercomparison of these and Vickers hardness scales has also been included in order to demonstrate the long-term stability of the scales. In order to assess the influence of the machines on the realisation of hardness scales, measurements by six laboratories using common HRB and common HRC scale indenters are described. The geometrical form and performance of a selected indenter were measured by four of the laboratories and the results of additional comparative measurements of two other indenters by two laboratories are also given. An important development arising from this measurement exercise is that the measurements obtained by the participants using national standardising indenters have been combined to establish harmonised scales for the Rockwell B and for the Rockwell C hardness tests.

Additional information

Authors: PEGGS G N, National Physical Laboratory, Teddington (GB)
Bibliographic Reference: EUR 11947 EN (1988) 42 pp.
Availability: (2)
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