Metallic materials - Knoop hardness test - Part 3: Calibration of reference blocks (ISO 4545-3:2017)

This document specifies the method for the calibration of reference blocks to be used for the indirect
verification of Knoop hardness testing machines as specified in ISO 4545-2.
The method is applicable only for indentations with long diagonals ≥0,020 mm.

Metallische Werkstoffe - Härteprüfung nach Knoop - Teil 3: Kalibrierung der Härtevergleichsplatten (ISO 4545-3:2017)

In diesem Dokument ist das Verfahren für die Kalibrierung von Härtevergleichsplatten festgelegt, die bei der indirekten Prüfung von Härteprüfmaschinen nach Knoop entsprechend ISO 4545 2 eingesetzt werden.
Das Verfahren ist nur auf Eindrücke mit langen Diagonalen  0,020 mm anwendbar.

Matériaux métalliques - Essai de dureté Knoop - Partie 3 : Étalonnage des blocs de référence (ISO 4545-3:2017)

ISO 4545-3:2017 spécifie la méthode pour l'étalonnage des blocs de référence à utiliser pour la vérification indirecte des machines d'essai de dureté Knoop conformément à l'ISO 4545‑2.
La méthode s'applique uniquement aux empreintes de longue diagonale supérieure ou égale à 0,020 mm.

Kovinski materiali - Preskus trdote po Knoopu - 3. del: Umerjanje primerjalnih ploščic (ISO 4545-3:2017)

Ta dokument določa metodo za umerjanje primerjalnih ploščic, ki so namenjene posrednemu
preverjanju naprav za preskušanje trdote po Knoopu, kot so določene v standardu ISO 4545-2.
Ta metoda se uporablja samo za zareze z diagonalami dolžine ≥ 0,020 mm.

General Information

Status
Published
Public Enquiry End Date
09-Aug-2015
Publication Date
07-May-2018
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Mar-2018
Due Date
26-May-2018
Completion Date
08-May-2018

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SLOVENSKI STANDARD
SIST EN ISO 4545-3:2018
01-julij-2018
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SIST EN ISO 4545-3:2006
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Metallic materials - Knoop hardness test - Part 3: Calibration of reference blocks (ISO

4545-3:2017)
Metallische Werkstoffe - Härteprüfung nach Knoop - Teil 3: Kalibrierung der
Härtevergleichsplatten (ISO 4545-3:2017)

Matériaux métalliques - Essai de dureté Knoop - Partie 3 : Étalonnage des blocs de

référence (ISO 4545-3:2017)
Ta slovenski standard je istoveten z: EN ISO 4545-3:2018
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 4545-3:2018 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 4545-3:2018
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SIST EN ISO 4545-3:2018
EN ISO 4545-3
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2018
EUROPÄISCHE NORM
ICS 19.060; 77.040.10 Supersedes EN ISO 4545-3:2005
English Version
Metallic materials - Knoop hardness test - Part 3:
Calibration of reference blocks (ISO 4545-3:2017)

Matériaux métalliques - Essai de dureté Knoop - Partie Metallische Werkstoffe - Härteprüfung nach Knoop -

3: Étalonnage des blocs de référence (ISO 4545- Teil 3: Kalibrierung von Härtevergleichsplatten (ISO

3:2017) 4545-3:2017
This European Standard was approved by CEN on 30 November 2017.

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 4545-3:2018 E

worldwide for CEN national Members.
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SIST EN ISO 4545-3:2018
EN ISO 4545-3:2018 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST EN ISO 4545-3:2018
EN ISO 4545-3:2018 (E)
European foreword

This document (EN ISO 4545-3:2018) 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 4545-3:2005.

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 4545-3:2017 has been approved by CEN as EN ISO 4545-3:2018 without any

modification.
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SIST EN ISO 4545-3:2018
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SIST EN ISO 4545-3:2018
INTERNATIONAL ISO
STANDARD 4545-3
Second edition
2017-12
Metallic materials — Knoop
hardness test —
Part 3:
Calibration of reference blocks
Matériaux métalliques — Essai de dureté Knoop —
Partie 3: Étalonnage des blocs de référence
Reference number
ISO 4545-3:2017(E)
ISO 2017
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SIST EN ISO 4545-3:2018
ISO 4545-3:2017(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2017, 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 2017 – All rights reserved
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SIST EN ISO 4545-3:2018
ISO 4545-3:2017(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Manufacture of the reference block ................................................................................................................................................. 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 measurement system ................................................................................................................................................. 3

6 Calibration procedure ..................................................................................................................................................................................... 3

7 Number of indentations ................................................................................................................................................................................ 4

8 Uniformity of hardness .................................................................................................................................................................................. 4

8.1 Relative non-uniformity .................................................................................................................................................................. 4

8.2 Uncertainty of measurement ...................................................................................................................................................... 4

9 Marking .......................................................................................................................................................................................................................... 4

10 Calibration certificate ..................................................................................................................................................................................... 5

11 Validity ............................................................................................................................................................................................................................ 5

Annex A (informative) Adjustment of Köhler illumination systems ................................................................................... 6

Annex B (informative) Uncertainty of mean hardness value of hardness-reference blocks......................7

Bibliography .............................................................................................................................................................................................................................12

© ISO 2017 – All rights reserved iii
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SIST EN ISO 4545-3:2018
ISO 4545-3:2017(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 second edition cancels and replaces the third edition (ISO 4545-3:2005), which has been technically

revised.

Significant technical changes from the previous edition of this document include:

— the requirements for the maximum test surface area of the reference block have been added;

— the requirements for the maximum uncertainty of the line intervals on the stage micrometer have

been revised;

— the requirements for the calibration and verification of the measuring system have been revised, as

per ISO 4545-2;

— the 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 B has been revised
A list of all parts in the ISO 4545 series can be found on the ISO website.
iv © ISO 2017 – All rights reserved
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SIST EN ISO 4545-3:2018
INTERNATIONAL STANDARD ISO 4545-3:2017(E)
Metallic materials — Knoop hardness test —
Part 3:
Calibration of reference blocks
1 Scope

This document specifies the method for the calibration of reference blocks to be used for the indirect

verification of Knoop hardness testing machines as specified in ISO 4545-2.
The method is applicable only for indentations with long 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 376:2011, Metallic materials — Calibration of force-proving instruments used for the verification of

uniaxial testing machines
ISO 4545-1, Metallic materials — Knoop hardness test — Part 1: Test method

ISO 4545-2, Metallic materials — Knoop 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 the reference block
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 and uniformity of surface

hardness.
4.2 Thickness
Each metal block to be calibrated shall be of a thickness not less than 5 mm.
4.3 Test surface area
The test surface area of the reference block shall not exceed 40 cm .
© ISO 2017 – All rights reserved 1
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SIST EN ISO 4545-3:2018
ISO 4545-3:2017(E)
4.4 Magnetism

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).
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, Ra, shall not exceed 0,05 µm . The bottom support surface shall be a finely

ground finish or better.
4.7 Prevention of the regrind of the test surface

To verify that no material is subsequently removed from the reference block, the 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 8.2 e)].
5 Calibration machine
5.1 General

In addition to fulfilling the general requirements specified in ISO 4545-2, 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 directly verified in intervals not exceeding 12 months.

Direct verification involves
— calibratio
...

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