SIST EN ISO 18203:2022

SLOVENSKI STANDARD
SIST EN ISO 18203:2022
01-junij-2022
Nadomešča:
SIST EN 10328:2005
SIST EN ISO 2639:2004
Jekla - Določanje debeline površinsko utrjenih plasti (ISO 18203:2016)
Steel - Determination of the thickness of surface-hardened layers (ISO 18203:2016)
Stahl - Bestimmung der Dicke gehärteter Randschichten (ISO 18203:2016)
Acier - Détermination de l'épaisseur des couches durcies superficielles (ISO
18203:2016)
Ta slovenski standard je istoveten z: EN ISO 18203:2022
ICS:
77.040.99 Druge metode za Other methods of testing of
preskušanje kovin metals
77.080.20 Jekla Steels
SIST EN ISO 18203:2022 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 18203:2022

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SIST EN ISO 18203:2022


EN ISO 18203
EUROPEAN STANDARD

NORME EUROPÉENNE

March 2022
EUROPÄISCHE NORM
ICS 77.040.99 Supersedes EN ISO 2639:2002, EN 10328:2005
English Version

Steel - Determination of the thickness of surface-hardened
layers (ISO 18203:2016)
Acier - Détermination de l'épaisseur des couches Stahl - Bestimmung der Dicke gehärteter
durcies superficielles (ISO 18203:2016) Randschichten (ISO 18203:2016)
This European Standard was approved by CEN on 20 March 2022.

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, 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 18203:2022 E
worldwide for CEN national Members.

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SIST EN ISO 18203:2022
EN ISO 18203:2022 (E)
Contents Page
European foreword . 3

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SIST EN ISO 18203:2022
EN ISO 18203:2022 (E)
European foreword
The text of ISO 18203:2016 has been prepared by Technical Committee ISO/TC 17 "Steel” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 18203:2022 by
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 September 2022, and conflicting national standards
shall be withdrawn at the latest by September 2022.
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 2639:2002 and EN 10328:2005.
Any feedback and questions on this document should be directed to the users’ national standards body.
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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 18203:2016 has been approved by CEN as EN ISO 18203:2022 without any modification.

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SIST EN ISO 18203:2022

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SIST EN ISO 18203:2022
INTERNATIONAL ISO
STANDARD 18203
First edition
2016-12-01
Steel — Determination of the
thickness of surface-hardened layers
Acier — Détermination de l’épaisseur des couches durcies
superficielles
Reference number
ISO 18203:2016(E)
©
ISO 2016

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SIST EN ISO 18203:2022
ISO 18203:2016(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

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SIST EN ISO 18203:2022
ISO 18203:2016(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative reference . 1
3 Terms and definitions . 1
4 Symbols, abbreviations and designations . 3
5 Principle . 3
6 Apparatus . 3
7 Test specimen . 4
7.1 Selection and preparation of samples . 4
7.2 Preparation of the surface to be examined . 5
8 Method of measurement . 5
8.1 Hardness testing method . 5
8.2 Microscopic methods. 6
8.2.1 Total thickness of surface hardening depth (THD) . 6
8.2.2 Compound layer thickness (CLT) . 6
9 Evaluation of the results . 7
9.1 Case hardening depth (CHD), surface hardening depth (SHD) and nitriding
hardness depth (NHD) . 7
9.2 Total thickness of surface hardening depth (THD). 7
9.3 Compound layer thickness (CLT) . 7
10 Test report . 8
Annex A (normative) Interpolation method for determining the case hardening depth .9
Annex B (informative) Examples of CLT measurements .11
Bibliography .12
© ISO 2016 – All rights reserved iii

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SIST EN ISO 18203:2022
ISO 18203:2016(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 World Trade Organization (WTO) principles in the
Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.
The committee responsible for this document is ISO/TC 17, Steel, Subcommittee SC 7, Methods of testing
(other than mechanical tests and chemical analysis).
This first edition of ISO 18203 cancels and replaces ISO 2639:2002, ISO 3754:1976 and ISO 4970:1979,
which have been technically revised.
iv © ISO 2016 – All rights reserved

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SIST EN ISO 18203:2022
ISO 18203:2016(E)

Introduction
In the past, there are three ISO standards for measuring surface-hardened layer. Because those
standards employed almost the same principle of measuring, it is intended to make it easy for
maintenance of the standards and application of test by integrating these three standards.
The method of estimating uncertainty of measurement is not included in this document. In future
revision, uncertainty of measurement may be reflected based on real applications to this test.
© ISO 2016 – All rights reserved v

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SIST EN ISO 18203:2022

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SIST EN ISO 18203:2022
INTERNATIONAL STANDARD ISO 18203:2016(E)
Steel — Determination of the thickness of surface-
hardened layers
1 Scope
This document specifies a method of measuring the case hardening depth, surface hardening depth,
nitriding hardness depth and total thickness of surface hardening depth obtained, e.g. thermal (flame
and induction hardening, electron beam hardening, laser beam hardening, etc.) or thermochemical
(carbonitriding, carburizing and hardening, hardening and nitriding, etc.) treatment.
NOTE Surface-hardened layer can be produced by mechanical method (shot blasting, shot peening, etc.). The
depth of these layers is generally shallow. Measuring a profile of hardened depth may require lower test force of
hardness test.
2 Normative reference
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 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
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
For the purposes of this document, the following terms and definitions apply.
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
3.1
case hardening depth
CHD
perpendicular distance between the surface and the layer having a hardness of 550 HV in accordance
with ISO 6507-1 or equivalent Knoop hardness in accordance with ISO 4545-1
Note 1 to entry: For steels which present a hardness greater than 450 HV at a distance of three times the case
hardening depth (determined with a limiting hardness value of 550 HV) from the surface, a limiting hardness
value greater than 550 HV, in steps of 25 units, can be selected for the determination of the case hardening depth
by agreement between interested parties.
Note 2 to entry: In general, case hardening consists of carburizing or carbonitriding followed by quench
hardening (see ISO 4885).
© ISO 2016 – All rights reserved 1

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