Magnetic materials - Part 12: Methods of test for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet

IEC 60404-12:2023 is applicable to surface insulation coatings on electrical steel strip and sheet classified in IEC 60404-1-1.
This document defines the general principles and technical details of the tests for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet.
The assessment is made by evaluating the change of a specified property of the surface insulation coating due to a heat treatment at a specified temperature up to 850 °C for a specified duration time up to 2 500 h. The specified property is measured at an ambient temperature of (23 ± 5) °C both without heat treatment and after heat treatment.
This edition includes the following significant technical changes with respect to the previous edition:  
the method of test for adhesion has been modified to match to the method of bend test specified in ISO 1519 using a cylindrical mandrel of 32 mm in diameter instead of the 30 mm diameter mandrel specified in the first edition;
the method of test for interlaminar insulation resistance has been modified to match to the method specified in IEC 60404-11 and the modified Franklin test has been removed;
the method of test for compressibility has been modified to match to the method of test for stacking factor specified in IEC 60404-13;
the concept of "resistance grades" has been removed;
the clamping pressure to be used at temperature ratings above 500 °C has been reduced to (0,01 ± 0,001) N/mm2;
the testing for continuous exposure has been made a subject to an agreement between the manufacturer and the purchaser and the procedure has been moved to an informative Annex A.

Matériaux magnétiques - Partie 12: Méthodes d’essai pour l’évaluation de l’endurance thermique des revêtements isolants superficiels des bandes et tôles en acier électrique

L’IEC 60404-12:2023 s'applique aux revêtements isolants superficiels des bandes et tôles en acier électrique classées dans l’IEC 60404-1-1.
Le présent document définit les principes généraux et les éléments techniques des essais relatifs à l’évaluation de l’endurance thermique des revêtements isolants superficiels des bandes et tôles en acier électrique.
L'évaluation consiste à apprécier la variation d’une propriété spécifiée du revêtement isolant superficiel du fait d’un traitement thermique à une température spécifiée allant jusqu’à 850 °C pendant une durée spécifiée maximale de 2 500 h. La propriété spécifiée est mesurée à une température ambiante de (23 ± 5) °C sans traitement thermique et après un traitement thermique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  
la méthode d'essai d’adhérence a été modifiée afin de correspondre à la méthode d’essai de pliage spécifiée dans l’ISO 1519, qui utilise un mandrin cylindrique d’un diamètre de 32 mm en lieu et place du mandrin d’un diamètre de 30 mm spécifié dans la première édition;
la méthode d’essai de résistance d'isolation interlaminaire a été modifiée afin de correspondre à la méthode spécifiée dans l’IEC 60404-11 et l’essai de Franklin modifié a été supprimé;
la méthode d’essai de compressibilité a été modifiée afin de correspondre à la méthode d’essai du facteur de foisonnement spécifiée dans l’IEC 60404-13;
le concept de "niveaux de résistance" a été supprimé;
la pression de serrage à utiliser à des températures assignées supérieures à 500 °C a été réduite à (0,01 ± 0,001) N/mm2;
L’essai d’exposition continue a fait l’objet d’un accord entre le fabricant et l’acheteur et la procédure a été déplacée vers une Annexe A informative.

General Information

Status
Published
Publication Date
09-Feb-2023
Drafting Committee
Current Stage
PPUB - Publication issued
Start Date
15-Mar-2023
Completion Date
10-Feb-2023
Ref Project

Buy Standard

Standard
IEC 60404-12:2023 - Magnetic materials - Part 12: Methods of test for the assessment of the thermal endurance of surface insulation coatings on electrical steel strip and sheet Released:2/10/2023
English and French language
27 pages
sale 15% off
Preview
sale 15% off
Preview

Standards Content (Sample)


IEC 60404-12 ®
Edition 2.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 12: Methods of test for the assessment of the thermal endurance of surface
insulation coatings on electrical steel strip and sheet

Matériaux magnétiques –
Partie 12: Méthodes d’essai pour l'évaluation de l’endurance thermique des
revêtements isolants superficiels des bandes et tôles en acier électrique

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester. If you have any questions about IEC
copyright or have an enquiry about obtaining additional rights to this publication, please contact the address below or
your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite ni
utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie et
les microfilms, sans l'accord écrit de l'IEC ou du Comité national de l'IEC du pays du demandeur. Si vous avez des
questions sur le copyright de l'IEC ou si vous désirez obtenir des droits supplémentaires sur cette publication, utilisez
les coordonnées ci-après ou contactez le Comité national de l'IEC de votre pays de résidence.

IEC Secretariat Tel.: +41 22 919 02 11
3, rue de Varembé info@iec.ch
CH-1211 Geneva 20 www.iec.ch
Switzerland
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigendum or an amendment might have been published.

IEC publications search - webstore.iec.ch/advsearchform IEC Products & Services Portal - products.iec.ch
The advanced search enables to find IEC publications by a Discover our powerful search engine and read freely all the
variety of criteria (reference number, text, technical publications previews. With a subscription you will always have
committee, …). It also gives information on projects, replaced access to up to date content tailored to your needs.
and withdrawn publications.
Electropedia - www.electropedia.org
IEC Just Published - webstore.iec.ch/justpublished
The world's leading online dictionary on electrotechnology,
Stay up to date on all new IEC publications. Just Published
containing more than 22 300 terminological entries in English
details all new publications released. Available online and once
and French, with equivalent terms in 19 additional languages.
a month by email.
Also known as the International Electrotechnical Vocabulary

(IEV) online.
IEC Customer Service Centre - webstore.iec.ch/csc
If you wish to give us your feedback on this publication or need
further assistance, please contact the Customer Service
Centre: sales@iec.ch.
A propos de l'IEC
La Commission Electrotechnique Internationale (IEC) est la première organisation mondiale qui élabore et publie des
Normes internationales pour tout ce qui a trait à l'électricité, à l'électronique et aux technologies apparentées.

A propos des publications IEC
Le contenu technique des publications IEC est constamment revu. Veuillez vous assurer que vous possédez l’édition la
plus récente, un corrigendum ou amendement peut avoir été publié.

Recherche de publications IEC - Découvrez notre puissant moteur de recherche et consultez
webstore.iec.ch/advsearchform gratuitement tous les aperçus des publications. Avec un
La recherche avancée permet de trouver des publications IEC abonnement, vous aurez toujours accès à un contenu à jour
en utilisant différents critères (numéro de référence, texte, adapté à vos besoins.
comité d’études, …). Elle donne aussi des informations sur les
projets et les publications remplacées ou retirées. Electropedia - www.electropedia.org

Le premier dictionnaire d'électrotechnologie en ligne au monde,
IEC Just Published - webstore.iec.ch/justpublished
avec plus de 22 300 articles terminologiques en anglais et en
Restez informé sur les nouvelles publications IEC. Just
français, ainsi que les termes équivalents dans 19 langues
Published détaille les nouvelles publications parues.
additionnelles. Egalement appelé Vocabulaire
Disponible en ligne et une fois par mois par email.
Electrotechnique International (IEV) en ligne.

Service Clients - webstore.iec.ch/csc
Si vous désirez nous donner des commentaires sur cette
publication ou si vous avez des questions contactez-nous:
sales@iec.ch.
IEC Products & Services Portal - products.iec.ch

IEC 60404-12 ®
Edition 2.0 2023-02
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 12: Methods of test for the assessment of the thermal endurance of surface

insulation coatings on electrical steel strip and sheet

Matériaux magnétiques –
Partie 12: Méthodes d’essai pour l'évaluation de l’endurance thermique des

revêtements isolants superficiels des bandes et tôles en acier électrique

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.01; 29.030 ISBN 978-2-8322-6445-4

– 2 – IEC 60404-12:2023 © IEC 2023
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 General principles . 7
4.1 General . 7
4.2 Preparation of clamped stacks of test specimens . 7
4.2.1 Procedure of stacking test specimens . 7
4.2.2 Clamping stacks for temperature ratings up to 500 °C . 7
4.2.3 Clamping stacks for temperature ratings above 500 °C . 8
4.3 Heat treatment . 8
4.3.1 For time ratings up to 2 500 h . 8
4.3.2 For continuous exposure . 9
5 Standard temperature/time performance designations T/t . 9
6 Method of the test for adhesion . 9
6.1 General . 9
6.2 Test specimens . 9
6.3 Procedure of test . 9
6.4 Test report . 10
7 Method of the test for surface insulation resistance . 10
7.1 General . 10
7.2 Test specimens . 10
7.3 Procedure of test . 10
7.4 Test report . 11
8 Method of the test for stacking factor . 11
8.1 General . 11
8.2 Test specimen . 11
8.3 Procedure of test . 11
8.4 Test report . 11
Annex A (informative) Method of test for the assessment of the thermal endurance for
continuous exposure to elevated temperatures . 12
A.1 General . 12
A.2 Procedure of test . 12
A.3 Temperature/time performance designations T/t for continuous exposure . 12
Bibliography . 13

Figure 1 – Example of clamped stack for 100 mm square test specimens . 8

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 12: Methods of test for the assessment of the thermal endurance
of surface insulation coatings on electrical steel strip and sheet

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international
co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,
Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their
preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with
may participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for
Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC
Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
misinterpretation by any end user.
4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications
transparently to the maximum extent possible in their national and regional publications. Any divergence between
any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any
services carried out by independent certification bodies.
6) All users should ensure that they have the latest edition of this publication.
7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and
members of its technical committees and IEC National Committees for any personal injury, property damage or
other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and
expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC
Publications.
8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent
rights. IEC shall not be held responsible for identifying any or all such patent rights.
IEC 60404-12 has been prepared by IEC technical committee 68: Magnetic alloys and steels.
It is an International Standard.
This second edition cancels and replaces the first edition published in 1992. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) the method of test for adhesion has been modified to match to the method of bend test
specified in ISO 1519 using a cylindrical mandrel of 32 mm in diameter instead of the 30 mm
diameter mandrel specified in t
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.