EN ISO 6508-3:2023

SLOVENSKI STANDARD
01-april-2024
Kovinski materiali - Preskus trdote po Rockwellu - 3. del: Umerjanje primerjalnih
ploščic (ISO 6508-3:2023)
Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks (ISO
6508-3:2023)
Metallische Werkstoffe - Härteprüfung nach Rockwell - Teil 3: Kalibrierung von
Härtevergleichsplatten (ISO 6508-3:2023)
Matériaux métalliques - Essai de dureté Rockwell - Partie 3: Étalonnage des blocs de
référence (ISO 6508-3:2023)
Ta slovenski standard je istoveten z: EN ISO 6508-3:2023
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 6508-3
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2023
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 6508-3:2015
English Version
Metallic materials - Rockwell hardness test - Part 3:
Calibration of reference blocks (ISO 6508-3:2023)
Matériaux métalliques - Essai de dureté Rockwell - Metallische Werkstoffe - Härteprüfung nach Rockwell -
Partie 3: Étalonnage des blocs de référence (ISO 6508- Teil 3: Kalibrierung von Härtevergleichsplatten (ISO
3:2023) 6508-3:2023)
This European Standard was approved by CEN on 13 November 2023.

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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6508-3:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 6508-3:2023) has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals" in collaboration with Technical Committee CEN/TC 459/SC 1 “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 June 2024, and conflicting national standards shall be
withdrawn at the latest by June 2024.
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 6508-3:2015.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 6508-3:2023 has been approved by CEN as EN ISO 6508-3:2023 without any
modification.
INTERNATIONAL ISO
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 6508-3:2023(E)
© ISO 2023
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
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
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 .11
Annex C (normative) Requirements for reference diamond indenters .16
Annex D (normative) Control verification of the calibration machine .17
Bibliography .18
iii
ISO 6508-3:2023(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 document 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).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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
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, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 459, ECISS - European Committee for Iron and Steel Standardization,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This fourth edition cancels and replaces the third edition (ISO 6508-3:2015), which has been technically
revised.
The main changes are as follows:
— removed all statements of requirements, permissions, and recommendations from the Scope of the
document (Clause 1);
— addition of Clause 3, Terms and definitions;
— modification of the requirements for the calibration and verification of the machine and indenter
(Clause 5);
— added a performance verification for the calibration machine and indenter (Clause 5);
— added a requirement to conduct a control verification prior to the calibration of reference blocks
(Clause 6);
— added a normative Annex D for the control verification of the calibration machine (Annex D).
A list of all parts in the ISO 6508 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html
iv
INTERNATIONAL STANDARD ISO 6508-3:2023(E)
Metallic materials — Rockwell 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
and daily verification of Rockwell hardness testing machines and indenters, as specified in ISO 6508-2.
This document also specifies requirements for Rockwell machines and indenters used for calibrating
reference blocks and specifies methods for their calibration and verification.
Atte
...