ISO 6507-3:2018
Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks
ISO 6507-3:2018 specifies a method for the calibration of reference blocks to be used for the indirect verification of Vickers hardness testing machines, as specified in ISO 6507‑2.
The method is applicable only for indentations with diagonals ≥0,020 mm.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Manufacture of reference blocks
4.1 General
4.2 Thickness
4.3 Test surface area
4.4 Magnetism
4.5 Flatness and parallelism
4.6 Surface roughness
4.7 Prevention of the regrind of the test surface
5 Calibration machine
5.1 General
5.2 Direct verification
5.3 Traceability of verification instruments
5.4 Test force
5.5 Indenter
5.6 Diagonal measuring system
6 Calibration procedure
7 Number of indentations
8 Uniformity of hardness
8.1 Relative non-uniformity
8.2 Uncertainty of measurement
9 Marking
10 Calibration certificate
11 Validity
Annex A (informative) Uncertainty of the mean hardness value of hardness reference blocks
Annex B (informative) Adjustment of Köhler illumination systems
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Manufacture of reference blocks
4.1 General
4.2 Thickness
4.3 Test surface area
4.4 Magnetism
4.5 Flatness and parallelism
4.6 Surface roughness
4.7 Prevention of the regrind of the test surface
5 Calibration machine
5.1 General
5.2 Direct verification
5.3 Traceability of verification instruments
5.4 Test force
5.5 Indenter
5.6 Diagonal measuring system
6 Calibration procedure
7 Number of indentations
8 Uniformity of hardness
8.1 Relative non-uniformity
8.2 Uncertainty of measurement
9 Marking
10 Calibration certificate
11 Validity
Annex A (informative) Uncertainty of the mean hardness value of hardness reference blocks
Annex B (informative) Adjustment of Köhler illumination systems
Bibliography