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STANDARD 6508-3
Fourth edition
2023-12
Metallic materials — Rockwell
hardness test —
Part 3:
Calibration of reference blocks
Matériaux métalliques — Essai de dureté Rockwell —
Partie 3: Étalonnage des blocs de référence
Reference number
ISO 6508-3:2023(E)
© ISO 2023
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ISO 6508-3:2023(E)
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© ISO 2023 – All rights reserved
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ISO 6508-3:2023(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Manufacture of reference blocks . 1
5 Calibration machine and calibration indenter . 2
5.1 General . 2
5.2 Direct verification of the calibration machine . 2
5.3 Calibration diamond indenter . 3
5.4 Calibration ball indenter . 4
5.5 Performance verification of the calibration machine and indenter . 5
6 Reference block calibration procedure . 6
7 Number of indentations . 7
8 Uniformity of hardness . 7
9 Marking . . 8
10 Calibration certificate .8
11 Validity . 8
Annex A (informative) Uniformity of reference blocks . 9
Annex B (informative) Uncertainty of the mean hardness value of hardness-reference
blocks .
...