1 Scope
This standard specifies a method for the calibration of reference blocks to be used for the
indirect verification of Vickers hardness testing machines, as specified in GB/T 4340.2.
The method is applicable only for indentations with diagonals > 0.020 mm.
The force values in this standard were calculated from kilogram force (kgf) values. They were introduced before the SI-system was adopted. It was decided to keep the values based on the old units for this edition, but for the next revision it will be necessary to consider the advantage of introducing rounded values of test force and the consequence on the hardness scales.
2 Normative References
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 1031-1995 Surface Roughness — Parameters and Their Values (neq ISO468:1982)
GB/T 4340.1-1999 Metallic Vickers Hardness Test — Part 1: Test Method (eqv ISO 6507-1:1997)
GB/T 4340.2-1999 Metallic Vickers Hardness Test — Part 2: Verification of Hardness Testers (idt ISO 6507-2:1997)
GB/T 13634-1992 Calibration of Force-proving Instruments Used for the Verification of Testing Machines (neq ISO 376:1987)
Foreword II
ISO Foreword IV
1 Scope
2 Normative References
3 Manufacture of Reference Blocks
4 Calibrating Machine
5 Calibration Procedure
6 Number of Indentations
7 Uniformity of Hardness
8 Marking
9 Validity
