IEC 60404-1-1:2004
(Main)Magnetic materials - Part 1-1: Classification - Surface insulations of electrical steel sheet, strip and laminations
Magnetic materials - Part 1-1: Classification - Surface insulations of electrical steel sheet, strip and laminations
Establishes a classification of surface insulations for electrical steel sheet, strip and laminations according to their general composition, relative insulating ability and function. These surface insulations are either oxide layers or applied coatings. The purpose of this classification is to create a nomenclature for the various types of surface insulations and to assist users of surface insulations by providing general information about the chemical nature and use of the surface insulations. It is not the intent of this classification to specify insulation requirements in terms of specific values of surface insulation resistance. Such requirements are agreed between the purchaser and the steel producer, where applicable. The classification is used in conjunction with the various specifications for cold rolled electrical steels (see the standards in the IEC 60404-8 series in Clause 2).
Matériaux magnétiques - Partie 1-1: Classification - Isolations de surface des tôles, bandes et lamelles magnétiques en acier
Etablit une classification des isolations de surface des tôles, bandes et lamelles magnétiques en acier en fonction de leur composition générale, leur aptitude relative à l'isolement et leur fonction. Ces isolations de surface sont soit des couches d'oxyde soit des revêtements appliqués. L'objectif de cette classification est de créer une nomenclature pour les différents types d'isolations de surface et d'aider les utilisateurs d'isolations de surface en fournissant des informations générales sur la nature chimique et l'utilisation des isolations de surface. L'intention de cette classification n'est pas de spécifier des exigences relatives à l'isolation en termes de valeurs spécifiques de résistance d'isolement superficiel. De telles exigences sont convenues entre l'acheteur et le producteur d'acier, le cas échéant. La classification est utilisée conjointement avec les diverses spécifications pour les aciers magnétiques laminés à froid (voir les normes de la série CEI 60404-8 dans l'Article 2).
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IEC 60404-1-1 ®
Edition 1.1 2024-07
CONSOLIDATED VERSION
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colour
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Magnetic materials –
Part 1-1: Classification – Surface insulations of electrical steel sheet, strip strip,
sheet and laminations
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030 ISBN 978-2-8322-9413-0
REDLINE VERSION – 2 – IEC 60404-1-1:2004+AMD1:2024 CSV
© IEC 2024
CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 6
4 Classification of surface insulations of electrical steel sheet, strip strip, sheet and
laminations . 6
Table 1 – Classification of surface insulations of electrical steel strip, sheet and
laminations . 6
© IEC 2024
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 1-1: Classification – Surface insulations of electrical steel sheet, strip
strip, sheet and laminations
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-
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consensus of opinion on the relevant subjects since each technical committee has representation from all
interested IEC National Committees.
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This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 60404-1-1 edition 1.1 contains the first edition (2004-04) [documents 68/292/FDIS
and 68/297/RVD] and its amendment 1 (2024-07) [documents 68/756/CDV and
68/763/RVC].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
REDLINE VERSION – 4 – IEC 60404-1-1:2004+AMD1:2024 CSV
© IEC 2024
International Standard IEC 60404-1-1 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of this document and its amendment will remain
unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the
data related to the specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
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© IEC 2024
MAGNETIC MATERIALS –
Part 1-1: Classification – Surface insulations of electrical steel sheet, strip
strip, sheet and laminations
1 Scope
This part of IEC 60404 establishes a classification of surface insulations for electrical steel
sheet, strip strip, sheet and laminations according to their general composition, relative
insulating ability and function.
These surface insulations are either oxide layers or applied coatings.
The purpose of this classification is to create a nomenclature for the various types of surface
insulations and to assist users of surface insulations by providing general information about
the chemical nature and use of the surface insulations.
It is not the intent of this classification to specify insulation requirements in terms of specific
values of surface insulation resistance. Such requirements are agreed between the purchaser
and the steel producer, where applicable.
The classification is used in conjunction with the various specifications for cold rolled
electrical steels (see the standards in the IEC 60404-8 series in Clause 2).
2 Normative references
The following referenced documents are indispensable for the application 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.
IEC 60050 (221), International Electrotechnical Vocabulary (IEV) - Chapter 221: Magnetic
materials and components
IEC 60404-8-2:1998, Magnetic materials – Part 8-2: Specifications for individual materials –
Cold-rolled electrical alloyed steel sheet and strip delivered in the semi-processed state
IEC 60404-8-3:1998, Magnetic materials – Part 8-3: Specifications for individual materials –
Cold-rolled electrical non-alloyed steel sheet and strip non-oriented electrical steel strip and
sheet delivered in the semi-processed state
IEC 60404-8-4:1998, Magnetic materials – Part 8-4: Specifications for individual materials –
Cold-rolled non-oriented electrical steel sheet and strip strip and sheet delivered in the fully-
processed state
IEC 60404-8-5:1989, Magnetic materials – Part 8-5: Specifications for individual materials –
Specification for steel sheet and strip with specified mechanical properties and magnetic
permeability Electrical steel strip and sheet with specified mechanical properties and
magnetic polarization
IEC 60404-8-7:1998, Magnetic materials – Part 8-7: Specifications for individual materials –
Cold-rolled grain-oriented electrical steel sheet and strip strip and sheet delivered in the fully-
processed state
REDLINE VERSION – 6 – IEC 60404-1-1:2004+AMD1:2024 CSV
© IEC 2024
IEC 60404-8-8:1991, Magnetic materials – Part 8-8: Specifications for individual materials –
Specification for thin magnetic steel strip for use at medium frequencies Thin electrical steel
strip and sheet for use at medium frequencies
IEC 60404-11:1999, Magnetic materials – Part 11: Method of test for the determination of
surface insulation resistance of magnetic sheet and strip Methods of measurement of the
surface insulation resistance of electrical steel strip and sheet
3 Terms and definitions
For the purposes of this document, the terms and definitions of the principal terms given in
IEC 60050(-221) and in IEC 60404-8-2, and in IEC 60404-8-3, IEC 60404-8-4, IEC 60404-8-
5, IEC 60404-8-7, IEC 60404-8-8 and IEC 60404-11 apply.
ISO and IEC maintain terminology databases for use in standardization at the following
addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Classification of surface insulations of electrical steel sheet, strip strip,
sheet and laminations
Table 1 gives the classification of surface insulations of electrical steel sheet, strip strip, sheet
and laminations.
Table 1 – Classification of surface insulations of electrical steel sheet,
strip strip, sheet and laminations
Insulation Insulation description – Characteristics –
designation Typical application, limits of use
EC-0 An oxide layer that is formed naturally on the steel surface during electrical steel
manufacture.
This oxide layer is thin, tightly adherent and provides sufficient surface insulation resistance
for many types of small cores.
This oxide layer will withstand normal stress relief annealing temperatures.
If subjected to a user’s anneal after stamping, the surface insulation resistance of this oxide
layer may be affected by the oxidizing potential of the anneal.
It is not appropriate to specify the surface insulation resistance for this type of insulation
EC-1 An oxide layer that is created on the surface of the steel laminations by contact with an
oxidizing furnace atmosphere at the end of the heat treatment cycle following the stamping of
the laminations.
This oxide layer is usually bluish to grey in colour.
...
NORME CEI
INTERNATIONALE
IEC
60404-1-1
INTERNATIONAL
Première édition
STANDARD
First edition
2004-04
Matériaux magnétiques –
Partie 1-1:
Classification – Isolations de surface des tôles,
bandes et lamelles magnétiques en acier
Magnetic materials –
Part 1-1:
Classification – Surface insulations of
electrical steel sheet, strip and laminations
Numéro de référence
Reference number
CEI/IEC 60404-1-1:2004
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IEC
60404-1-1
INTERNATIONAL
Première édition
STANDARD
First edition
2004-04
Matériaux magnétiques –
Partie 1-1:
Classification – Isolations de surface des tôles,
bandes et lamelles magnétiques en acier
Magnetic materials –
Part 1-1:
Classification – Surface insulations of
electrical steel sheet, strip and laminations
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MATÉRIAUX MAGNÉTIQUES –
Partie 1-1: Classification – Isolations de surface des tôles,
bandes et lamelles magnétiques en acier
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La Norme internationale CEI 60404-1-1 a été établie par le comité d'études 68 de la CEI:
Matériaux magnétiques tels qu’alliages et aciers.
Le texte de cette norme est issu des documents suivants:
FDIS Rapport de vote
68/292/FDIS 68/297/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à l'approbation de cette norme.
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60404-1-1 IEC:2004 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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MAGNETIC MATERIALS –
Part 1-1: Classification – Surface insulations of
electrical steel sheet, strip and laminations
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.
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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.
International Standard IEC 60404-1-1 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
The text of this standard is based on the following documents:
FDIS Report on voting
68/292/FDIS 68/297/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
– 4 – 60404-1-1 CEI:2004
Le comité a décidé que le contenu de cette publication ne sera pas modifié avant 2008.
A cette date, la publication sera
• reconduite;
• supprimée;
• remplacée par une édition révisée, ou
• amendée.
60404-1-1 IEC:2004 – 5 –
The committee has decided that the contents of this publication will remain unchanged until
2008. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
– 6 – 60404-1-1 CEI:2004
MATÉRIAUX MAGNÉTIQUES –
Partie 1-1: Classification – Isolations de surface des tôles,
bandes et lamelles magnétiques en acier
1 Domaine d'application
La présente partie de la CEI 60404 établit une classification des isolati
...
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