EN ISO 6507-1:2018

SLOVENSKI STANDARD
01-julij-2018
1DGRPHãþD
SIST EN ISO 6507-1:2006
Kovinski materiali - Preskus trdote po Vickersu - 1. del: Preskusni postopek (ISO
6507-1:2018)
Metallic materials - Vickers hardness test - Part 1: Test method (ISO 6507-1:2018)
Metallische Werkstoffe - Härteprüfung nach Vickers - Teil 1: Prüfverfahren (ISO 6507-
1:2018)
Matériaux métalliques - Essai de dureté Vickers - Partie 1: Méthode d'essai (ISO 6507-
1:2018)
Ta slovenski standard je istoveten z: EN ISO 6507-1:2018
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 6507-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 6507-1:2005
English Version
Metallic materials - Vickers hardness test - Part 1: Test
method (ISO 6507-1:2018)
Matériaux métalliques - Essai de dureté Vickers - Partie Metallische Werkstoffe - Härteprüfung nach Vickers -
1: Méthode d'essai (ISO 6507-1:2018) Teil 1: Prüfverfahren (ISO 6507-1:2018)
This European Standard was approved by CEN on 18 January 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6507-1:2018 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6507-1:2018) has been prepared by Technical Committee ISO/TC 164
“Mechanical testing of metals” in collaboration with Technical Committee ECISS/TC 101 “Test methods
for steel (other than chemical analysis)” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2018, and conflicting national standards
shall be withdrawn at the latest by September 2018.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 6507-1:2005.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 6507-1:2018 has been approved by CEN as EN ISO 6507-1:2018 without any
modification.
INTERNATIONAL ISO
STANDARD 6507-1
Fourth edition
2018-01
Metallic materials — Vickers
hardness test —
Part 1:
Test method
Matériaux métalliques — Essai de dureté Vickers —
Partie 1: Méthode d'essai
Reference number
ISO 6507-1:2018(E)
©
ISO 2018
ISO 6507-1:2018(E)
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Symbols and designations . 2
5.1 Symbols and designations used in this document . 2
5.2 Designation of hardness number . 3
6 Testing machine . 3
6.1 Testing machine . 3
6.2 Indenter . . 3
6.3 Diagonal measuring system . 4
7 Test piece . 4
7.1 Test surface . 4
7.2 Preparation . 4
7.3 Thickness . 4
7.4 Tests on curved surfaces . 4
7.5 Support of unstable test pieces . 5
8 Procedure. 5
8.1 Test temperature . 5
8.2 Test force . 5
8.3 Periodic verification . 5
8.4 Test piece support and orientation . 5
8.5 Focus on test surface . 6
8.6 Test force application . 6
8.7 Prevention of the effect of shock or vibration . 6
8.8 Minimum distance between adjacent indentations . 6
8.9 Measurement of the diagonal length . 7
8.10 Calculation of hardness value . 7
9 Uncertainty of the results . 7
10 Test report . 8
Annex A (normative) Minimum thickness of the test piece in relation to the test force and
to the hardness . 9
Annex B (normative) Tables of correction factors for use in tests made on curved surfaces .11
Annex C (normative) Procedure for periodic checking of the testing machine, diagonal
measuring system and the indenter by the user .15
Annex D (informative) Uncertainty of the measured hardness values .17
Annex E (informative) Vickers hardness measurement traceability .24
Annex F (informative) CCM — Working group on hardness .28
Annex G (informative) Adjustment of Köhler illumination systems .29
Bibliography .30
ISO 6507-1:2018(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals,
Subcommittee SC 3, Hardness testing.
This fourth edition cancels and replaces the third edition (ISO 6507-1:2005), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— requirements for testing hardmetals and other cemented carbides have been added;
— all references of indentation diagonals, <0,020 mm, have been removed;
— resolution requirements for the measuring system have been defined;
— the lower test force limit of the Vickers microhardness test has been expanded to 0,009 807 N;
— requirements for the periodic (weekly or daily) verifications of the testing machine are normative,
and the maximum permissible bias value has been revised. Requirements for the maximum
permissible error in measuring a reference indentation have been revised;
— recommendations for inspection and monitoring of the indenter have been added;
— requirements have been added for the approach velocity of the indenter prior to contact with the
sample surface;
— the timing requirements for the test force application and the duration at maximum test force have
been revised to indicate target time values;
— Figure 2, which illustrates the requirements for the minimum distance between indentations, has
been added, but the requirements have not changed;
— requirements have been added to the test report for reporting the test date and any hardness
conversion method used;
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ISO 6507-1:2018(E)
— Annex D has been revised;
— Annexes E, F and G have been added concerning Vickers hardness measurement traceability, the
CCM — Working group on hardness and adjustment of Köhler illumination systems.
A list of all parts in the ISO 6507 series can be found on the ISO website.
INTERNATIONAL STANDARD ISO 6507-1:2018(E)
Metallic materials — Vickers hardness test —
Part 1:
Test method
1 Scope
This document specifies the Vickers hardness test method for the three different ranges of test force for
metallic materials including hardmetals and other cemented carbides (see Table 1).
Table 1 — Ranges of test force
Ranges of test force, F
Hardness symbol Designation
N
F ≥ 49,03 ≥HV 5 Vickers hardness test
1,961 ≤ F < 49,03 HV 0,2 to 0,009 807 ≤ F < 1,961 HV 0,001 to The Vickers hardness test is specified in this document for lengths of indentation diagonals between
0,020 mm and 1,400 mm. Using this method to determine Vickers hardness from smaller indentations
is outside the scope of this document as results would suffer from large uncertainties due to the
limitations of optical measurement and imperfections in tip geometry.
A periodic verification method is specified for routine checking of the testing machine in service by
the user.
For specific materials and/or products, particular International Standards exist.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 6507-2:2017, Metallic materials — Vickers hardness test — Part 2: Verification and calibration of
testing machines
ISO 6507-3, Metallic materials — Vickers hardness test — Part 3: Calibration of reference blocks
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
ISO 6507-1:2018(E)
4 Principle
A diamond indenter, in the form of a right pyramid with a square base and with a specified angle
between opposite faces at the vertex, is forced into the surface of a test piece followed by measurement
of the diagonal length of the indentation left in the surface after removal of the test force, F (see
Figure 1).
Figure 1 — Principle of the test, geometry of indenter and Vickers indentation
The Vickers hardness is proportional to the quotient obtained by dividing the test force by the area
of the sloped surface of indentation, which is assumed to be a right pyramid with a square base and
having at the vertex the same angle as the indenter.
NOTE 1 A right pyramid has its apex aligned with the centre of the base.
NOTE 2 As applicable, this document has adopted hardness test parameters as defined by the Working Group
on Hardness (CCM-WGH) under the framework of the International Committee of Weights and Measures (CIPM)
Consultative Committee for Mass and Related Quantities (CCM) (see Annex F).
5 Symbols and designations
5.1 Symbols and designations used in this document
See Table 2 and Figure 1.
2 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Table 2 — Symbols and designations
Symbol Designation
α Mean angle between the opposite faces at the vertex of the pyramidal indenter (nominally 136°)
(see Figure 1)
F Test force, in newtons (N)
d Arithmetic mean, in millimetres, of the two diagonal lengths d and d (see Figure 1)
1 2
Test force (kgf)
Vickers hardness =
Surface area of indentation (mm )
1 TestForce(N)
=×
g
n Surfaceareaofindentation(mm)
α
2Fsin
1 F 1
=× =×
HV
g α g
 
2 d
nn
d /s2 in
 
 
For the nominal angle α = 136°,
F
Vickers hardness ≈×0,1891
d
NOTE 1  Standard acceleration due to gravity, g = 9,806 65 m/s which is the conversion factor from kgf to N
n
To reduce uncertainty, the Vickers hardness may be calculated using the actual mean indenter angle, α.
5.2 Designation of hardness number
Vickers hardness, HV, is designated as shown in the following example.
6 Testing machine
6.1 Testing machine
The testing machine shall be capable of applying a predetermined force or forces within the desired
range of test forces, in accordance with ISO 6507-2.
6.2 Indenter
The indenter shall be a diamond in the shape of a right pyramid with a square base, as specified in
ISO 6507-2.
ISO 6507-1:2018(E)
6.3 Diagonal measuring system
The diagonal measuring system shall satisfy the requirements in ISO 6507-2.
Magnifications should be provided so that the diagonal can be enlarged to greater than 25 % but less
than 75 % of the maximum possible optical field of view. Many objective lenses are nonlinear towards
the edge of the field of view.
A diagonal measuring system using a camera for measurement can use 100 % of the camera’s field of
view provided it is designed to consider field of view limitations of the optical system.
The resolution required of the diagonal measuring system depends on the size of the smallest
indentation to be measured and shall be in accordance with Table 3. In determining the resolution of
the measuring system, the resolution of the microscope optics, the digital resolution of the measuring
scale and the step-size of any stage movement, where applicable, should be taken into account.
Table 3 — Resolution of the measuring system
Diagonal length, d
Resolution of the measuring system
mm
0,020 ≤ d < 0,080 0,000 4 mm
0,080 ≤ d ≤ 1,400 0,5 % of d
7 Test piece
7.1 Test surface
The test shall be carried out on a surface which is smooth and even, free from oxide scale, foreign matter
and, in particular, completely free from lubricants, unless otherwise specified in product standards.
The finish of the surface shall permit accurate determination of the diagonal length of the indentation.
For hardmetal samples, the thickness of the layer removed from the surface shall be not less than 0,2 mm.
7.2 Preparation
Surface preparation shall be carried out in such a way as to prevent surface damage or alteration of the
surface hardness due to excessive heating or cold-working.
Due to the small depth of Vickers microhardness indentations, it is essential that special precautions
be taken during preparation. It is recommended to use a polishing/electropolishing process which is
suitable for the material to be measured.
7.3 Thickness
The thickness of the test piece or of the layer under test shall be at least 1,5 times the diagonal length of
the indentation as defined in Annex A. No deformation shall be visible at the back of the test piece after
the test.
The thickness of a hardmetal test piece shall be at least 1 mm.
NOTE The depth of the indentation is approximately 1/7 of the diagonal length (0,143 d).
7.4 Tests on curved surfaces
For tests on curved surfaces, the corrections given in Tables B.1 to B.6 shall be applied.
4 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
7.5 Support of unstable test pieces
For a test piece of small cross-section or of irregular shape, either a dedicated support should be used
or it should be mounted in a similar manner to a metallographic micro-section in appropriate material
so that it is adequately supported and does not move during the force application.
8 Procedure
8.1 Test temperature
The test is normally carried out at ambient temperature within the limits of 10 °C to 35 °C. If the test
is carried out at a temperature outside this range, it shall be noted in the test report. Tests carried out
under controlled conditions shall be made at a temperature of (23 ± 5) °C.
8.2 Test force
The test forces given in Table 4 are typical. Other test forces may be used including greater than 980,7 N,
but not less than 0,009 807 N. Test forces shall be chosen that result in indentations with diagonals
greater than 0,020 mm.
NOTE For hardmetals, the preferred test force is 294,2 N (HV 30).
Table 4 — Typical test forces
a
Hardness test Low-force hardness test Microhardness test
Nominal value of Nominal value of Nominal value of
Hardness Hardness Hardness
the test force, F the test force, F the test force, F
symbol symbol symbol
N N N
— — — — HV 0,001 0,009 807
— — — — HV 0,002 0,019 61
— — — — HV 0,003 0,029 42
— — — — HV 0,005 0.049 03
HV 5 49,03 HV 0,2 1,961 HV 0,01 0,098 07
HV 10 98,07 HV 0,3 2,942 HV 0,015 0,147 1
HV 20 196,1 HV 0,5 4,903 HV 0,02 0,196 1
HV 30 294,2 HV 1 9,807 HV 0,025 0,245 2
HV 50 490,3 HV 2 19,61 HV 0,05 0,490 3
a
HV 100 980,7 HV 3 29,42 HV 0,1 0,980 7
a
Nominal test forces greater than 980,7 N may be applied.
8.3 Periodic verification
The periodic verification defined in Annex C shall be performed within a week prior to use for each test
force used but is recommended on the day of use. The periodic verification is recommended whenever
the test force is changed. The periodic verification shall be done whenever the indenter is changed.
8.4 Test piece support and orientation
The test piece shall be placed on a rigid support. The support surfaces shall be clean and free from
foreign matter (scale, oil, dirt, etc.). It is important that the test piece lies firmly on the support so that
any displacement that affects the test result cannot occur during the test.
For anisotropic materials, for example, those which have been heavily cold-worked, there could be a
difference between the lengths of the two diagonals of the indentation. Therefore, where possible, the
ISO 6507-1:2018(E)
indentation should be made so that the diagonals are oriented in plane at approximately 45° to the
direction of cold-working. The specification for the product could indicate limits for the differences
between the lengths of the two diagonals.
8.5 Focus on test surface
The diagonal measuring system microscope shall be focused so that the specimen surface and the
desired test location can be observed.
NOTE Some testing machines do not require that the microscope be focused on the specimen surface.
8.6 Test force application
The indenter shall be brought into contact with the test surface and the test force shall be applied in a
direction perpendicular to the surface, without shock, vibration or overload, until the applied force
attains the specified value. The time from the initial application of the force until the full test force is
+1
reached shall be7 s .
−5
+1
NOTE 1 The requirements for the time durations are given with asymmetric limits. For example, 7 s
−5
indicates that 7 s is the nominal time duration, with an acceptable range of not less than 2 s (calculated as 7 s – 5 s)
to not more than 8 s (calculated as 7 s + 1 s).
For the Vickers hardness range and low-force Vickers hardness range tests, the indenter shall contact
the test piece at a velocity of ≤0,2 mm/s. For micro-hardness tests, the indenter shall contact the test
piece at a velocity of ≤0,070 mm/s.
+1
The duration of the test force shall be 14 s , except for tests on materials whose time-dependent
−4
properties would make this an unsuitable range. For these tests, this duration shall be specified as part
of the hardness designation (see 5.2).
NOTE 2 There is evidence that some materials are sensitive to the rate of straining which causes changes in
the value of the yield strength. The corresponding effect on the termination of the formation of an indentation
can make alterations in the hardness value.
8.7 Prevention of the effect of shock or vibration
[5]
Throughout the test, the testing machine shall be protected from shock or vibration .
8.8 Minimum distance between adjacent indentations
The minimum distance between adjacent indentations and the minimum distance between an
indentation and the edge of the test piece are shown in Figure 2.
The distance between the centre of any indentation and the edge of the test piece shall be at least
2,5 times the mean diagonal length of the indentation in the case of steel, copper and copper alloys and
at least three times the mean diagonal length of the indentation in the case of light metals, lead and tin
and their alloys.
The distance between the centres of two adjacent indentations shall be at least three times the mean
diagonal length of the indentation in the case of steel, copper and copper alloys and at least six times the
mean diagonal length in the case of light metals, lead and tin and their alloys. If two adjacent indentations
differ in size, the spacing shall be based on the mean diagonal length of the larger indentation.
6 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Key
1 edge of test piece
2 steel, copper and copper alloys
3 light metals, lead and tin and their alloys
Figure 2 — Minimum distance for Vickers indentations
8.9 Measurement of the diagonal length
The lengths of the two diagonals shall be measured. The arithmetical mean of the two readings shall be
taken for the calculation of the Vickers hardness. For all tests, the perimeter of the indentation shall be
clearly defined in the field of view of the microscope.
Magnifications should be selected so that the diagonal can be enlarged to greater than 25 %, but less
than 75 % of the maximum possible optical field of view; see 6.3.
NOTE 1 In general, decreasing the test force increases the scatter of results of the measurements. This is
particularly true for low-force Vickers hardness tests and Vickers microhardness tests, where the principal
limitation will arise in the measurement of the diagonals of the indentation. For Vickers microhardness, the
accuracy of determination of the mean diagonal length is unlikely to be better than ±0,001 mm when using an
optical microscope (see References [6] to [9]).
NOTE 2 A helpful technique for adjusting optical systems that have Köhler illumination is given in Annex G.
For flat surfaces, the difference between the lengths of the diagonals should not be greater than 5 %. If
the difference is greater, this shall be stated in the test report.
8.10 Calculation of hardness value
Calculate the Vickers hardness value using the formula given in Table 2. The Vickers hardness value can
also be determined using the calculation tables given in ISO 6507-4. For curved surfaces, the correction
factors given in Annex B shall be applied.
9 Uncertainty of the results
[4]
A complete evaluation of the uncertainty should be done according to JCGM 100:2008 .
ISO 6507-1:2018(E)
Independent of the type of sources, for hardness, there are two possibilities for the determination of the
uncertainty.
— One possibility is based on the evaluation of all relevant sources appearing during a direct calibration.
[10]
As a reference, a Euramet guideline is available.
— The other possibility is based on indirect calibration using a hardness reference block [below
abbreviated as certified reference material (CRM)] (see References [10] to [13]). A guideline for the
determination is given in Annex D.
It may not always be possible to quantify all the identified contributions to the uncertainty. In this case,
an estimate of type A standard uncertainty may be obtained from the statistical analysis of repeated
indentations into the test piece. Care should be taken, if standard uncertainties of type A and B are
[4]
summarized, that the contributions are not counted twice (JCGM 100:2008, Clause 4 ).
10 Test report
The test report shall include the following information unless otherwise agreed by the parties
concerned:
a) a reference to this document, i.e., ISO 6507-1;
b) all information necessary for identification of the test piece;
c) the date of the test;
d) the hardness result obtained in HV, reported in the format defined in 5.2;
e) all operations not specified in this document or regarded as optional;
f) details of any circumstances that affected the results;
g) the temperature of the test, if it is outside the ambient range specified in 8.1;
h) where conversion to another hardness scale is also performed, the basis and method of this
conversion .
There is no general process of accurately converting Vickers hardness into other scales of hardness
or into tensile strength. Such conversions, therefore, should be avoided, unless a reliable basis for
conversion can be obtained by comparison tests (see also ISO 18265).
NOTE A strict comparison of hardness values is only possible at identical test forces.
8 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Annex A
(normative)
Minimum thickness of the test piece in relation to the test force
and to the hardness
Key
X thickness of the test piece, mm
Y hardness, HV
Figure A.1 — Minimum thickness of the test piece in relation to the test force and to the
hardness (HV 0,2 to HV 100)
ISO 6507-1:2018(E)
Key
a
Hardness value, HV.
b
Minimum thickness, t, mm.
c
Diagonal length, d, mm.
d
Hardness symbol, HV.
e
Test force F, N.
Figure A.2 — Nomogram designed for the minimum thickness of the test piece
(HV 0,01 to HV 100)
The nomogram shown in Figure A.2 has been designed for the minimum thickness of a test piece,
assuming that the minimum thickness has to be 1,5 times the diagonal length of the indentation. The
required thickness is given by the point of intersection of the minimum thickness scale and a line
(shown dotted in the example in Figure A.2) joining the test force (right-hand scale) with the hardness
(left-hand scale).
10 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Annex B
(normative)
Tables of correction factors for use in tests made on curved
surfaces
B.1 Spherical surfaces
Tables B.1 and B.2 give the correction factors when tests are made on spherical surfaces.
The correction factors are tabulated in terms of the ratio of the mean diagonal, d, of the indentation to
the diameter, D, of the sphere.
EXAMPLE
Convex sphere, D = 10 mm
Test force, F = 98,07 N
Mean diagonal of indentation, d = 0,150 mm
d 0,150
==0,015
D 10
98,07
VickershardnessH=×0,1891 =824 V10
(,015)
Correction factor from Table B.1, by interpolation = 0,983
Hardness of sphere = 824 × 0,983 = 810 HV 10
Table B.1 — Convex spherical surfaces
d/D Correction factor d/D Correction factor
0,004 0,995 0,086 0,920
0,009 0,990 0,093 0,915
0,013 0,985 0,100 0,910
0,018 0,980 0,107 0,905
0,023 0,975 0,114 0,900
0,028 0,970 0,122 0,895
0,033 0,965 0,130 0,890
0,038 0,960 0,139 0,885
0,043 0,955 0,147 0,880
0,049 0,950 0,156 0,875
0,055 0,945 0,165 0,870
0,061 0,940 0,175 0,865
0,067 0,935 0,185 0,860
0,073 0,930 0,195 0,855
0,079 0,925 0,206 0,850
ISO 6507-1:2018(E)
Table B.2 — Concave spherical surfaces
d/D Correction factor d/D Correction factor
0,004 1,005 0,057 1,080
0,008 1,010 0,060 1,085
0,012 1,015 0,063 1,090
0,016 1,020 0,066 1,095
0,020 1,025 0,069 1,100
0,024 1,030 0,071 1,105
0,028 1,035 0,074 1,110
0,031 1,040 0,077 1,115
0,035 1,045 0,079 1,120
0,038 1,050 0,082 1,125
0,041 1,055 0,084 1,130
0,045 1,060 0,087 1,135
0,048 1,065 0,089 1,140
0,051 1,070 0,091 1,145
0,054 1,075 0,094 1,150
B.2 Cylindrical surfaces
Tables B.3 to B.6 give the correction factors when tests are made on cylindrical surfaces.
The correction factors are tabulated in terms of the ratio of the mean diagonal, d, of the indentation to
the diameter, D, of the cylinder.
EXAMPLE
Concave cylinder, one diagonal of the indentation parallel to axis, D = 5 mm
Test force, F = 294,2 N
Mean diagonal of indentation, d = 0,415 mm
d 0,415
==0,083
D 5
294,2
VickershardnessH=×0,1891 =323 V30
(,0 415)
Correction factor from Table B.6 = 1,075
Hardness of cylinder = 323 × 1,075 = 347 HV 30
12 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Table B.3 — Convex cylindrical surfaces — Diagonals at 45° to the axis
d/D Correction factor d/D Correction factor
0,009 0,995 0,119 0,935
0,017 0,990 0,129 0,930
0,026 0,985 0,139 0,925
0,035 0,980 0,149 0,920
0,044 0,975 0,159 0,915
0,053 0,970 0,169 0,910
0,062 0,965 0,179 0,095
0,071 0,960 0,189 0,900
0,081 0,955 0,200 0,895
0,090 0,950
0,100 0,945
0,109 0,940
Table B.4 — Concave cylindrical surfaces — Diagonals at 45° to the axis
d/D Correction factor d/D Correction factor
0,009 1,005 0,127 1,080
0,017 1,010 0,134 1,085
0,025 1,015 0,141 1,090
0,034 1,020 0,148 1,095
0,042 1,025 0,155 1,100
0,050 1,030 0,162 1,105
0,058 1,035 0,169 1,110
0,066 1,040 0,176 1,115
0,074 1,045 0,183 1,120
0,082 1,050 0,189 1,125
0,089 1,055 0,196 1,130
0,097 1,060 0,203 1,135
0,104 1,065 0,209 1,140
0,112 1,070 0,216 1,145
0,119 1,075 0,222 1,150
Table B.5 — Convex cylindrical surfaces — One diagonal parallel to the axis
d/D Correction factor d/D Correction factor
0,009 0,995 0,085 0,965
0,019 0,990 0,104 0,960
0,029 0,985 0,126 0,955
0,041 0,980 0,153 0,950
0,054 0,975 0,189 0,945
0,068 0,970 0,243 0,940
ISO 6507-1:2018(E)
Table B.6 — Concave cylindrical surfaces — One diagonal parallel to the axis
d/D Correction factor d/D Correction factor
0,008 1,005 0,087 1,080
0,016 1,010 0,090 1,085
0,023 1,015 0,093 1,090
0,030 1,020 0,097 1,095
0,036 1,025 1,100 1,100
0,042 1,030 0,103 1,105
0,048 1,035 0,105 1,110
0,053 1,040 0,108 1,115
0,058 1,045 0,111 1,120
0,063 1,050 0,113 1,125
0,067 1,055 0,116 1,130
0,071 1,060 0,118 1,135
0,076 1,065 0,120 1,140
0,079 1,070 0,123 1,145
0,083 1,075 0,125 1,150
14 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Annex C
(normative)
Procedure for periodic checking of the testing machine, diagonal
measuring system and the indenter by the user
C.1 Periodic verification
The indenter to be used for the periodic verification shall be the same as used for testing. A hardness
reference block shall be chosen for testing that is calibrated in accordance to ISO 6507-3 on the scale
and at the approximate hardness level at which the machine will be used.
Before performing the periodic verification, the diagonal measuring system shall be indirectly verified
using one of the reference indentations on the hardness reference block. The measured indentation
length shall agree with the certified value to within the greater of 0,001 mm or 1,25 % of the
indentation length. If the diagonal measuring system fails this test, a second reference indentation may
be measured. If the diagonal measuring system fails this second test, the diagonal measuring system
shall be adjusted or repaired and undergo direct and indirect verification according to ISO 6507-2.
At least two hardness measurements shall be made on the calibrated surface of the hardness reference
block. The indentations shall be uniformly distributed over the surface of the reference block. The
machine is regarded as satisfactory if the maximum positive or negative percent bias, b , for each
rel
reading does not exceed the limits shown in Table C.1.
The percent bias, b , is calculated according to Formula (C.1):
rel
HH−
CRM
b =×100 (C.1)
rel
H
CRM
where
H is the hardness value corresponding to the hardness measurement taken;
H is the certified hardness of the reference block used.
CRM
If the testing machine fails this test, verify that the indenter and testing machine are in good working
condition and repeat the periodic verification. If the machine continues to fail the periodic verification,
an indirect verification according to ISO 6507-2 shall be performed. A record of the periodic verification
results should be maintained over a period of time and used to measure reproducibility and monitor
drift of the machine.
ISO 6507-1:2018(E)
Table C.1 — Maximum permissible percent HV bias
Maximum permissible percent HV bias,
Mean diagonal length,
b ,
rel
d
of the testing machine
mm
± %HV
0,02 ≤ d < 0,14 0,21/ d + 1,5
0,14 ≤ d ≤ 1,400
NOTE The criteria specified in this document for the performance of the testing machine have been
developed and refined over a significant period of time. When determining a specific tolerance that the machine
needs to meet, the uncertainty associated with the use of measuring equipment and/or reference standards has
been incorporated within this tolerance and it would therefore be inappropriate to make any further allowance
for this uncertainty by, for example, reducing the tolerance by the measurement uncertainty. This applies to all
measurements made when performing a periodic verification of the machine.
C.2 Indenter inspection
Experience has shown that a number of initially satisfactory indenters can become defective after use
for a comparatively short time. This is due to small cracks, pits or other flaws in the surface. lf such
faults are detected in time, many indenters may be reclaimed by regrinding. If not, any small defects on
the surface rapidly worsen and make the indenter useless. Therefore,
— the condition of indenters should be monitored by visually checking the aspect of the indentation on
a reference block each day the testing machine is used;
— the verification of the indenter is no longer valid when the indenter shows defects;
— reground or otherwise repaired indenters shall meet all of the requirements of ISO 6507-2.
16 © ISO 2018 – All rights reserved

ISO 6507-1:2018(E)
Annex D
(informative)
Uncertainty of the measured hardness values
D.1 General requirements
Measurement uncertainty analysis is a useful tool to help determine sources of error and to understand
differences in test results. This annex gives guidance on uncertainty estimation but the methods
contained are for information only, unless specifically instructed otherwise by the customer.
Most p
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