WORLD-WIDE UNIFIED SCALES FOR THE ROCKWELL HARDNESS TEST WITH CONICAL INDENTERS
Th. Polzin, D. Schwenk
Abstract:
The aim of this round robin test was to discover what needs to be done to achieve the worldwide unification of Rockwell hardness scales using diamond indenters (HRC, HRA, HRD, HR15N, HR30N and HR45N). These scales are the most commonly used and their unification is of high industrial importance. The current degree of unification at an international level was assessed by conducting a round robin test. Seventy four specially developed hardness test blocks were all calibrated by twelve laboratories in eleven countries and the results were compared. Test parameters were specified that were more precise than those required by the standards. The indenters used to make hardness measurements have a significant effect on the measured result. To separate these indenter effects, measurements were made using common indenters as well as the indenters normally used by the laboratories.
Joint International Conference on Force, Mass, Torque, Hardness and Civil Engineering Metrology in the age of globalization
Title:
8th HARDMEKO Conference on Hardness Measurement (together with 18th TC3 Conference on Force, Mass and Torque and 1st TC20 Conference on Civil Engineering Metrology)
