SIST EN ISO 6507-3:2018
(Main)Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks (ISO 6507-3:2018)
Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks (ISO 6507-3:2018)
This document 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.g
Metallische Werkstoffe - Härteprüfung nach Vickers - Teil 3: Kalibrierung von Härtevergleichsplatten (ISO 6507-3:2018)
Dieses Dokument legt ein Verfahren für die Kalibrierung von Härtevergleichsplatten fest, die bei der indirekten Überprüfung von Härteprüfmaschinen nach Vickers nach ISO 6507 2 verwendet werden.
Das Verfahren ist nur anwendbar für Eindrücke mit Diagonalenlängen ≥ 0,020 mm.
Matériaux métalliques - Essai de dureté Vickers - Partie 3: Étalonnage des blocs de référence (ISO 6507-3:2018)
L'ISO 6507-3:2018 spécifie une méthode pour l'étalonnage des blocs de référence à utiliser pour la vérification indirecte des machines d'essai de dureté Vickers comme spécifiée dans l'ISO 6507‑2.
La méthode s'applique uniquement pour les empreintes avec des diagonales ≥0,020 mm.
Kovinski materiali - Preskus trdote po Vickersu - 3. del: Umerjanje primerjalnih ploščic (ISO 6507-3:2018)
Ta dokument določa metodo za umerjanje primerjalnih ploščic, ki se uporabljajo pri posrednem preverjanju naprav za preskušanje trdote po Vickersu, kot so določene v standardu ISO 6507‑-2.
Ta metoda se uporablja samo za zareze z diagonalami ≥ 0,020 mm.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 6507-3:2018
01-julij-2018
1DGRPHãþD
SIST EN ISO 6507-3:2006
.RYLQVNLPDWHULDOL3UHVNXVWUGRWHSR9LFNHUVXGHO 8PHUMDQMHSULPHUMDOQLK
SORãþLF ,62
Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks (ISO
6507-3:2018)
Metallische Werkstoffe - Härteprüfung nach Vickers - Teil 3: Kalibrierung von
Härtevergleichsplatten (ISO 6507-3:2018)
Matériaux métalliques - Essai de dureté Vickers - Partie 3: Étalonnage des blocs de
référence (ISO 6507-3:2018)
Ta slovenski standard je istoveten z: EN ISO 6507-3:2018
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 6507-3:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 6507-3:2018
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SIST EN ISO 6507-3:2018
EN ISO 6507-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 6507-3:2005
English Version
Metallic materials - Vickers hardness test - Part 3:
Calibration of reference blocks (ISO 6507-3:2018)
Matériaux métalliques - Essai de dureté Vickers - Partie Metallische Werkstoffe - Härteprüfung nach Vickers -
3: Étalonnage des blocs de référence (ISO 6507- Teil 3: Kalibrierung von Härtevergleichsplatten (ISO
3:2018) 6507-3:2018)
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 6507-3:2018 E
worldwide for CEN national Members.
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SIST EN ISO 6507-3:2018
EN ISO 6507-3:2018 (E)
Contents Page
European foreword . 3
2
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SIST EN ISO 6507-3:2018
EN ISO 6507-3:2018 (E)
European foreword
This document (EN ISO 6507-3:2018) 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 6507-3:2005.
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 6507-3:2018 has been approved by CEN as EN ISO 6507-3:2018 without any
modification.
3
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SIST EN ISO 6507-3:2018
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SIST EN ISO 6507-3:2018
INTERNATIONAL ISO
STANDARD 6507-3
Fourth edition
2018-01
Metallic materials — Vickers
hardness test —
Part 3:
Calibration of reference blocks
Matériaux métalliques — Essai de dureté Vickers —
Partie 3: Étalonnage des blocs de référence
Reference number
ISO 6507-3:2018(E)
©
ISO 2018
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SIST EN ISO 6507-3:2018
ISO 6507-3:2018(E)
COPYRIGHT PROTECTED DOCUMENT
© 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
---------------------- Page: 8 ----------------------
SIST EN ISO 6507-3:2018
ISO 6507-3:2018(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Manufacture of reference blocks . 1
4.1 General . 1
4.2 Thickness . 1
4.3 Test surface area . 1
4.4 Magnetism . . 2
4.5 Flatness and parallelism . 2
4.6 Surface roughness . 2
4.7 Prevention of the regrind of the test surface . 2
5 Calibration machine . 2
5.1 General . 2
5.2 Direct verification . 2
5.3 Traceability of verification instruments . 2
5.4 Test force . 3
5.5 Indenter . . 3
5.6 Diagonal measuring system . 4
6 Calibration procedure . 5
7 Number of indentations . 5
8 Uniformity of hardness . 6
8.1 Relative non-uniformity . 6
8.2 Uncertainty of measurement . 7
9 Marking . 7
10 Calibration certificate . 7
11 Validity . 8
Annex A (informative) Uncertainty of the mean hardness value of hardness reference blocks .9
Annex B (informative) Adjustment of Köhler illumination systems .14
Bibliography .15
© ISO 2018 – All rights reserved iii
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SIST EN ISO 6507-3:2018
ISO 6507-3:2018(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 6507-3:2005), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— requirements have been added for the maximum test surface area of the reference block;
— requirements have been revised for the maximum uncertainty of the line intervals on the stage
micrometer;
— requirements for the calibration and verification of the measuring system have been revised per
ISO 6507-2;
— requirements for the uniformity of the reference block hardness have been revised to account for
different numbers of calibration indentations;
— the timing requirements for the approach velocity and the time duration at maximum test force
have been revised to indicate a target time value;
— Annex A has been revised.
A list of all parts in the ISO 6507 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved
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SIST EN ISO 6507-3:2018
INTERNATIONAL STANDARD ISO 6507-3:2018(E)
Metallic materials — Vickers hardness test —
Part 3:
Calibration of reference blocks
1 Scope
This document 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.
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 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial
testing machines
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6507-2, Metallic materials — Vickers hardness test — Part 2: Verification and calibration of testing
machines
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 http://www.iso.org/obp
4 Manufacture of reference blocks
4.1 General
The block shall be specially manufactured for use as a hardness-reference block using a manufacturing
process that will give the necessary homogeneity, stability of structure, uniformity of surface hardness
and time-dependent stability in hardness.
4.2 Thickness
The thickness of the reference block shall not be less than 5 mm.
4.3 Test surface area
2
The test surface area of the reference block shall not exceed 40 cm .
© ISO 2018 – All rights reserved 1
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SIST EN ISO 6507-3:2018
ISO 6507-3:2018(E)
4.4 Magnetism
The reference blocks shall be free of magnetism. It is recommended that the manufacturer shall ensure
that the blocks, if made of steel, have been demagnetized at the end of the manufacturing process
(before calibration).
4.5 Flatness and parallelism
The maximum deviation in flatness of the test and support surfaces shall not exceed 0,005 mm. The
maximum error in parallelism shall not exceed 0,010 mm in 50 mm.
4.6 Surface roughness
The test surface shall be free from scratches that interfere with the measurement of the indentations.
[1]
The test surface roughness, R , shall not exceed 0,05 µm. The bottom support surface shall be a finely
a
ground finish or better.
4.7 Prevention of the regrind of the test surface
To verify that no material has been subsequently removed from the reference block, its thickness at
the time of calibration shall be marked on the reference block to the nearest 0,01 mm or an identifying
mark shall be made on the test surface [see Clause 9 e)].
5 Calibration machine
5.1 General
In addition to fulfilling the general requirements specified in ISO 6507-2, the calibration machine shall
also meet the requirements given in 5.2 to 5.6.
NOTE The criteria specified in this document for the performance of the calibration 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 direct verification of the calibration machine.
5.2 Direct verification
The calibration machine shall be verified directly at intervals not exceeding 12 months.
Direct verification involves
a) verification of the test force,
b) verification of the indenter,
c) calibration and verification of the diagonal measuring system, and
d) verification of the testing cycle; if this is not possible, at least the force versus time behaviour.
5.3 Traceability of verification instruments
The instruments used for verification and calibration shall be traceable to national standards.
2 © ISO 2018 – All rights reserved
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SIST EN ISO 6507-3:2018
ISO 6507-3:2018(E)
5.4 Test force
Each test force shall be verified at three different positions of the plunger, spaced at approximately
equal increments covering the limits of travel used during testing. At each position, the force shall
be measured three times using an elastic proving device according to ISO 376, class 0,5 or better or
by another method having the same or better accuracy. Each measurement shall agree with the
nominal value to within ±0,2 % for normal hardness, to within ±0,3 % for low-force hardness and to
within ±0,5 % for microhardness.
5.5 Indenter
The indenter shall comply with ISO 6507-2 and meet the following requirements.
a) The four faces of the square-based diamond pyramid shall be highly polished, free from surface
defects and flat within 0,000 3 mm.
b) The angle between the opposite faces of the vertex of the diamond pyramid shall be 136° ± 0,1°.
c) The angle between the axis of the diamond pyramid and the axis of the indenter-holder (normal to
the seating surface) shall be less than 0,3°.
d) The point of the diamond indenter shall be examined with a high-power measuring microscope
or preferably with an interference microscope. If the fo
...
SLOVENSKI STANDARD
oSIST prEN ISO 6507-3:2016
01-oktober-2016
.RYLQVNLPDWHULDOL3UHVNXVWUGRWHSR9LFNHUVXGHO 8PHUMDQMHSULPHUMDOQLK
SORãþLF ,62',6
Metallic materials - Vickers hardness test - Part 3: Calibration of reference blocks
(ISO/DIS 6507-3:2016)
Metallische Werkstoffe - Härteprüfung nach Vickers - Teil 3: Kalibrierung von
Härtevergleichsplatten (ISO/DIS 6507-3:2016)
Matériaux métalliques - Essai de dureté Vickers - Partie 3: Étalonnage des blocs de
référence (ISO/DIS 6507-3:2016)
Ta slovenski standard je istoveten z: prEN ISO 6507-3:2016
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
oSIST prEN ISO 6507-3:2016 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
oSIST prEN ISO 6507-3:2016
---------------------- Page: 2 ----------------------
oSIST prEN ISO 6507-3:2016
DRAFT INTERNATIONAL STANDARD
ISO/DIS 6507-3
ISO/TC 164/SC 3 Secretariat: DIN
Voting begins on: Voting terminates on:
2016-07-12 2016-10-03
Metallic materials — Vickers hardness test —
Part 3:
Calibration of reference blocks
Matériaux métalliques — Essai de dureté Vickers —
Partie 3: Étalonnage des blocs de référence
ICS: 77.040.10
ISO/CEN PARALLEL PROCESSING
This draft has been developed within the International Organization for
Standardization (ISO), and processed under the ISO lead mode of collaboration
as defined in the Vienna Agreement.
This draft is hereby submitted to the ISO member bodies and to the CEN member
bodies for a parallel five month enquiry.
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
To expedite distribution, this document is circulated as received from the
IN ADDITION TO THEIR EVALUATION AS
committee secretariat. ISO Central Secretariat work of editing and text
BEING ACCEPTABLE FOR INDUSTRIAL,
composition will be undertaken at publication stage.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 6507-3:2016(E)
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
©
PROVIDE SUPPORTING DOCUMENTATION. ISO 2016
---------------------- Page: 3 ----------------------
oSIST prEN ISO 6507-3:2016
ISO/DIS 6507-3:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland
All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 4 ----------------------
oSIST prEN ISO 6507-3:2016
ISO/DIS 6507-3:2016(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative references .1
3 Manufacture of reference blocks .1
3.1 General .1
3.2 Thickness .1
3.3 Magnetism .1
3.4 Flatness and parallelism .1
3.5 Surface roughness .2
3.6 Prevention of the regrind of the test surface .2
4 Calibration machine .2
4.1 General .2
4.2 Direct verification.2
4.3 Traceability of verification instruments.2
4.4 Test force .2
4.5 Indenter .2
4.6 Diagonal measuring system.3
5 Calibration procedure.4
6 Number of indentations .4
7 Uniformity of hardness .5
7.1 Relative non-uniformity .5
7.2 Uncertainty of measurement .6
8 Marking .6
9 Calibration certificate .7
10 Validity .7
Annex A (informative) Uncertainty of the mean hardness value of hardness reference blocks.8
Annex B (informative) Adjustment of Köhler illumination systems. 13
Bibliography . 14
© ISO 2016 – All rights reserved iii
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oSIST prEN ISO 6507-3:2016
ISO/DIS 6507-3:2016(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 meaning of ISO specific terms and expressions related to conformity assessment,
as well as information about ISO's adherence to the WTO principles in the Technical Barriers to Trade (TBT)
see the following URL: Foreword - Supplementary information
ISO 6507-3 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 6507-3:2005), which has been technically
revised.
ISO 6507 consists of the following parts, under the general title Metallic materials — Vickers hardness test:
Part 1: Test method
Part 2: Verification and calibration of testing machines
Part 3: Calibration of reference blocks
Part 4: Tables of hardness values
iv © ISO 2016 – All rights reserved
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oSIST prEN ISO 6507-3:2016
DRAFT INTERNATIONAL STANDARD ISO/DIS 6507-3:2016(E)
Metallic materials — Vickers hardness test — Part 3: Calibration
of reference blocks
1 Scope
This part of ISO 6507 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.
2 Normative references
The following referenced documents are indispensable for the application 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 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial
testing machines
ISO 4287, Geometrical Product Specifications (GPS) — Surface texture: Profile method — Terms, definitions
and surface texture parameters
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6507-2, Metallic materials — Vickers hardness test — Part 2: Verification and calibration of testing
machines
3 Manufacture of reference blocks
3.1 General
The block shall be specially manufactured for use as a hardness-reference block using a manufacturing
process that will give the necessary homogeneity, stability of structure and uniformity of surface hardness.
3.2 Thickness
Each metal block to be calibrated shall be of a thickness not less than 5 mm.
3.3 Magnetism
The reference blocks shall be free of magnetism. It is recommended that the manufacturer shall ensure that
the blocks, if made of steel, have been demagnetized at the end of the manufacturing process (before
calibration).
3.4 Flatness and parallelism
The maximum deviation in flatness of the test and support surfaces shall not exceed 0,005 mm in 50 mm. The
maximum error in parallelism shall not exceed 0,010 mm in 50 mm.
© ISO 2016 – All rights reserved
1
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oSIST prEN ISO 6507-3:2016
ISO/DIS 6507-3:2016(E)
3.5 Surface roughness
The test surface shall be free from scratches that interfere with the measurement of the indentations. The
surface roughness R shall not exceed 0,05 µm for the test surface. The sampling length l shall be 0,80 mm
a
(see ISO 4287). The bottom surface shall be a finely ground finish or better.
3.6 Prevention of the regrind of the test surface
To verify that no material has been subsequently removed from the reference block, its thickness at the time
of calibration shall be marked on the reference block to the nearest 0,01 mm, or an identifying mark shall be
made on the test surface [see 8.1 e)].
4 Calibration machine
4.1 General
In addition to fulfilling the general requirements specified in ISO 6507-2, the calibration machine shall also
meet the requirements given in 4.2 to 4.7.
4.2 Direct verification
The calibration machine shall be verified directly at intervals not exceeding 12 months.
Direct verification involves
a) verification of the test force;
b) verification of the indenter;
c) calibration and verification of the diagonal measuring system ;
d) verification of the testing cycle; if this is not possible, at least the force versus time behaviour.
4.3 Traceability of verification instruments
The instruments used for verification and calibration shall be traceable to national standards.
4.4 Test force
Each test force shall be verified at 3 different positions of the plunger, spaced at approximately equal
increments covering the limits of travel used during testing. At each position, the force shall be measured
three times using an elastic proving device according to ISO 376 Class 0,5 or better, or by another method
having the same or better accuracy. Each measurement shall agree with the nominal value to within 0,2 %
for normal hardness, to within ± 0,3 % for low-force hardness, and to within 0,5 % for microhardness.
4.5 Indenter
The indenter shall comply with ISO 6507-2, clause 4.3 and meet the following requirements:
a) The four faces of the square-based diamond pyramid shall be highly polished, free from surface defects,
and flat within 0,000 3 mm.
b) The angle between the opposite faces of the vertex of the diamond pyramid shall be 136° 0,1°.
c) The angle between the axis of the diamond pyramid and the axis of the indenter-holder (normal to the
seating surface) shall be less than 0,3°.
© ISO 2016 – All rights reserved
2
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oSIST prEN ISO 6507-3:2016
ISO/DIS 6507-3:2016(E)
d) The point of the diamond indenter shall be examined with a high-power measuring microscope or
preferably with an interference microscope and, if the four faces do not meet at a point, the line of junction
between opposite faces shall comply with the values in Table 1.
Table 1
Ranges of test force, F Maximum permissible length of the line of junction, a
N mm
0,001
F ≧ 49,03
0,000 5
1,961 ≦ F 49,03
0,009 807 ≦ F 1,961 0,000 25
e) It shall be verified that the quadrilateral which would be formed by the intersection of the faces with a
plane perpendicular to the axis of the diamond pyramid has angles of 90° 0,2° (see Figure 1).
A valid calibration certificate shall exist which confirms the geometrical deviations of the indenter.
Figure 1 — Permissible difference of the sectional planes of the square form
4.6 Diagonal measuring system
The scale of the diagonal measuring system shall be graduated to permit estimation of the diagonals of the
indentation in accordance with Table 2.
© ISO 2016 – All rights reserved
3
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oSIST prEN ISO 6507-3:2016
ISO/DIS 6507-3:2016(E)
Table 2
Diagonal length, d
Resolution of the diagonal
Maximum permissible error
measuring system
mm
d ≤ 0,060 0,000 15 mm ±0,000 3 mm
0,060 d ≤ 0,200 0,25 % of d ±0,5 % of d
d 0,200 0,000 5 mm ±0,001 mm
The system for measuring the diagonal of the indentation shall be verified at each magnification and for each
incorporated line scale to be used in two perpendicular measurement axis (if applicable), by performing
measurements on an accurately ruled stage micrometer. Measurements shall be made at a minimum of five
evenly spaced intervals, arranged centrally in the field of view, covering each working range.
The maximum uncertainty of the line intervals on the stage micrometer shall be 0,000 1 mm or 0,02 %,
whichever is greater.
Three measurements shall be made at each of the evenly spaced intervals. The maximum permissible error of
each of the three measurements at each interval shall not exceed the values given in Table 2. If necessary, a
calibration factor can be applied to comply with this tolerance.
NOTE A helpful technique for adjusting optical systems that have Köhler illumination is given in Annex B.
5 Calibration procedure
The reference blocks shall be calibrated in a calibration machine as described in Clause 4, at a temperature of
(23 5) °C, using the general procedure specified in ISO 6507-1.
During calibration, the thermal drift should not exceed 1 °C.
The time from the initial application of force until the full test force is reached, and the approach velocity of the
indenter, shall meet the requirements given in Table 3.
+1
The duration of application of the test force shall be 14 s.
−1
For microhardness testing, the maximum allowable vibrational acceleration reaching the calibration machine
2
shall be 0,005 g (g equals the standard acceleration of gravity: g
...
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