EN 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

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.

Magnetische Werkstoffe - Teil 12: Prüfverfahren zur Beurteilung der Temperaturbeständigkeit von Oberflächenisolationsbeschichtungen auf Elektroband und -blech

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.

Magnetni materiali - 12. del: Metode preskušanja za oceno toplotne vzdržljivosti površinskih izolacijskih premazov na električnih jeklenih trakovih in pločevinah (IEC 60404-12:2023)

Ta del standarda IEC 60404 se uporablja za površinske izolacijske premaze na električnih jeklenih trakovih in
pločevini, ki so razvrščeni v standardu IEC 60404-1-1.
Ta dokument določa splošna načela in tehnične podrobnosti preskusov za
ocenjevanje toplotne vzdržljivosti površinskih izolacijskih premazov na električnih jeklenih trakovih in
pločevini.
Ocena je izvedena z oceno sprememb določene lastnosti površinskega
izolacijskega premaza zaradi toplotne obdelave pri določeni temperaturi do 850 °C in določenem trajanju
do 2500 ur. Določena lastnost se meri pri temperaturi okolja
(23 ± 5) °C tako v primeru brez toplotne obdelave kot po toplotni obdelavi.
Ta dokument se uporablja za naslednje lastnosti površinskih izolacijskih premazov:
– adhezija;
– površinska izolacijska upornost;
– skladni faktor.
Ta dokument se ne uporablja za druge lastnosti površinskih izolacijskih premazov, npr. varilne
lastnosti, ali druge učinke, npr. razbarvanje in uhajanje plinov, ki so lahko posledica
izpostavljenosti povišanim temperaturam.
OPOMBA: Izvedba nekaterih preskusov vzame veliko časa, zato pogosto niso ustrezni za preskuse sprejemljivosti materiala, dobavljenega s posebnim naročilom.

General Information

• Status: Published
• Publication Date: 23-Mar-2023
• ICS: 17.220.01 - Electricity. Magnetism. General aspects
• ICS: 29.030 - Magnetic materials
• Technical Committee: CLC/SR 68 - Magnetic alloys and steels
• Drafting Committee: IEC/TC 68 - IEC_TC_68
• Current Stage: 6060 - Document made available - Publishing
• Start Date: 24-Mar-2023
• Completion Date: 24-Mar-2023
• Ref Project: SIST EN 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 (IEC 60404-12:2023)

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2023
Magnetni materiali - 12. del: Metode preskušanja za oceno toplotne vzdržljivosti
površinskih izolacijskih premazov na električnih jeklenih trakovih in pločevinah
(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 (IEC 60404-
12:2023)
Magnetische Werkstoffe - Teil 12: Prüfverfahren zur Bewertung der thermischen
Beständigkeit von Oberflächenisolierbeschichtungen auf Elektroband und -blech (IEC
60404-12:2023)
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
(IEC 60404-12:2023)
Ta slovenski standard je istoveten z: EN IEC 60404-12:2023
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
29.030 Magnetni materiali Magnetic materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD EN IEC 60404-12

NORME EUROPÉENNE
EUROPÄISCHE NORM March 2023
ICS 29.030; 17.220.01
English Version
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)
Matériaux magnétiques - Partie 12: Méthodes d'essai pour Magnetische Werkstoffe - Teil 12: Prüfverfahren zur
l'évaluation de l'endurance thermique des revêtements Bewertung der thermischen Beständigkeit von
isolants superficiels des bandes et tôles en acier électrique Oberflächenisolierbeschichtungen auf Elektroband und -
(IEC 60404-12:2023) blech
(IEC 60404-12:2023)
This European Standard was approved by CENELEC on 2023-03-17. CENELEC 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 CENELEC 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 CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Türkiye and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2023 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN IEC 60404-12:2023 E

European foreword
The text of document 68/698/CDV, future edition 2 of IEC 60404-12, prepared by IEC/TC 68
"Magnetic alloys and steels" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN IEC 60404-12:2023.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2023-12-17
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2026-03-17
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national committee. A
complete listing of these bodies can be found on the CENELEC website.
Endorsement notice
The text of the International Standard IEC 60404-12:2023 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
IEC 60216-1 NOTE Approved as EN 60216-1
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod),
the relevant EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available
here: www.cencenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-121 - International Electrotechnical Vocabulary - - -
Part 121: Electromagnetism
IEC 60050-221 - International Electrotechnical Vocabulary. - -
Chapter 221: Magnetic materials and
components
IEC 60404-1-1 - Magnetic materials - Part 1-1: - -
Classification - Surface insulations of
electrical steel sheet, strip and laminations
IEC 60404-11 - Magnetic materials - Part 11: Method of - -
test for the determination of surface
insulation resistance of magnetic sheet
and strip
IEC 60404-13 - Magnetic materials - Part 13: Methods of EN IEC 60404-13 -
measurement of resistivity, density and
stacking factor of electrical steel strip and
sheet
ISO 1519 - Paints and varnishes - Bend test EN ISO 1519 -
(cylindrical mandrel)
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

IEC 60404-12:2023 © IEC 2023 – 3 –
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
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