SIST EN ISO 6508-3:2015

SLOVENSKI STANDARD
01-maj-2015
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SIST EN ISO 6508-3:2006
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Metallic materials - Rockwell hardness test - Part 3: Calibration of reference blocks (ISO
6508-3:2015)
Metallische Werkstoffe - Härteprüfung nach Rockwell - Teil 3: Kalibrierung von
Härtevergleichsplatten (ISO 6508-3:2015)
Matériaux métalliques - Essai de dureté Rockwell - Partie 3: Étalonnage des blocs de
référence (ISO 6508-3:2015)
Ta slovenski standard je istoveten z: EN ISO 6508-3:2015
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.

EUROPEAN STANDARD
EN ISO 6508-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2015
ICS 77.040.10 Supersedes EN ISO 6508-3:2005
English Version
Metallic materials - Rockwell hardness test - Part 3: Calibration
of reference blocks (ISO 6508-3:2015)
Matériaux métalliques - Essai de dureté Rockwell - Partie 3: Metallische Werkstoffe - Härteprüfung nach Rockwell - Teil
Étalonnage des blocs de référence (ISO 6508-3:2015) 3: Kalibrierung von Härtevergleichsplatten (ISO 6508-
3:2015)
This European Standard was approved by CEN on 10 January 2015.

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, 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: Avenue Marnix 17, B-1000 Brussels
© 2015 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 6508-3:2015 E
worldwide for CEN national Members.

Contents
Page
Foreword .3

Foreword
This document (EN ISO 6508-3:2015) 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 2015, and conflicting national standards shall be
withdrawn at the latest by September 2015.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 6508-3:2005.
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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 6508-3:2015 has been approved by CEN as EN ISO 6508-3:2015 without any modification.
INTERNATIONAL ISO
STANDARD 6508-3
Third edition
2015-03-01
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 6508-3:2015(E)
©
ISO 2015
ISO 6508-3:2015(E)
© ISO 2015
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
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Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2015 – All rights reserved

ISO 6508-3:2015(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Manufacture of reference blocks . 1
4 Calibration machine and calibration indenter . 2
4.1 General . 2
4.2 Calibration machine . 2
4.3 Calibration diamond indenter . 2
4.4 Calibration ball indenter . 4
5 Calibration procedure . 4
6 Number of indentations . 5
7 Uniformity of hardness . 5
8 Marking . 6
9 Calibration certificate . 7
10 Validity . 7
Annex A (normative) Uniformity of reference blocks . 8
Annex B (informative) Uncertainty of the mean hardness value of hardness-reference blocks .10
Annex C (normative) Requirements for reference diamond indenters .16
Bibliography .17
ISO 6508-3:2015(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
The committee responsible for this document is ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 3, Hardness testing.
This third edition cancels and replaces the second edition (ISO 6508-3:2005), which has been
technically revised.
ISO 6508 consists of the following parts, under the general title Metallic materials — Rockwell hardness test:
— Part 1: Test method
— Part 2: Verification and calibration of testing machines and indenters
— Part 3: Calibration of reference blocks
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 6508-3:2015(E)
Metallic materials — Rockwell hardness test —
Part 3:
Calibration of reference blocks
1 Scope
This part of ISO 6508 specifies a method for the calibration of reference blocks to be used for the indirect
and daily verification of Rockwell hardness testing machines, as specified in ISO 6508-2:2015.
Attention is drawn to the fact that the use of hard metal for ball indenters is considered to be the
standard type of Rockwell indenter ball. Steel indenter balls can be used only when complying with
ISO 6508-1:2015, Annex A.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. 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 6508-1:2015, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 6508-2:2015, Metallic materials — Rockwell hardness test — Part 2: Verification and calibration of
testing machines and indenters
3 Manufacture of reference blocks
3.1 The block shall be specially manufactured for use as a hardness-reference block.
NOTE Attention is drawn to the need to use a manufacturing process, which will give the necessary
homogeneity, stability of structure, and uniformity of surface hardness.
3.2 Each hardness reference block shall be of a thickness not less than 6 mm. To minimize the effect of
hardness change with increasing number of indents, thicker blocks should be used.
3.3 The reference blocks shall be free of magnetism. It is recommended that the manufacturer ensure
that the blocks, if made of steel, have been demagnetized at the end of the manufacturing process (before
calibration).
3.4 The deviation from surface flatness of the top and bottom surfaces shall be ≤0,01 mm. The bottom
of the blocks shall not be convex. The deviation from parallelism of the top and bottom surfaces shall
be ≤0,02 mm per 50 mm.
3.5 The test surface and lower surface shall be free from damage, such as notches, scratches, oxide
layers, etc., which can interfere with the measurement of the indentations. The surface roughness, Ra,
shall not exceed 0,000 3 mm for the test surface and 0,000 8 mm for the bottom surface. Sampling length
is l = 0,8 mm (see ISO 4287:1997, 3.1.9).
©
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