IEC 60404-8-4:2022

Magnetic materials - Part 8-4: Specifications for individual materials - Cold-rolled non-oriented electrical steel strip and sheet delivered in the fully-processed state

IEC 60404-8-4:2022 defines the grades of cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses of 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedure. The nominal thickness 0,47 mm applies to the grades for use at 60 Hz only. This document applies to cold-rolled non-oriented electrical steel strip and sheet supplied in the fully-processed state, i.e. the final annealed condition, in coils or sheets, and intended for the construction of magnetic circuits. This document does not apply to materials supplied in the semi-processed state. This edition includes the following significant technical changes with respect to the previous edition:
- modification of terms and technical requirements concerning geometrical characteristics to be consistent with IEC 60404-9:2018;
- insertion of Table 3 - Tolerances on nominal thickness;
- change of the length of test specimen for determination of geometrical characteristics from 2 m to 1 m.

Matériaux magnétiques - Partie 8-4: Spécifications pour matériaux particuliers - Bandes et tôles magnétiques en acier à grains non orientés, laminées à froid et livrées à l'état fini

L'IEC 60404-8-4:2022 définit les qualités des bandes et tôles magnétiques en acier à grains non orientés, laminées à froid, d'épaisseurs nominales 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm et 1,00 mm. Elle définit notamment les exigences générales, les caractéristiques magnétiques, les caractéristiques géométriques, les tolérances et les caractéristiques technologiques, ainsi que les procédures de contrôle applicables. L'épaisseur nominale 0,47 mm s'applique aux qualités pour utilisation à 60 Hz seulement. Le présent document s'applique aux bandes et tôles magnétiques en acier à grains non orientés, laminées à froid, livrées à l'état fini, c'est-à-dire à l'état de recuit final, en bobines ou en tôles et destinées à la construction de circuits magnétiques. Le présent document ne s'applique pas aux matériaux livrés à l'état semi-fini. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- modification des termes et des exigences techniques concernant les caractéristiques géométriques dans un souci de cohérence avec l'IEC 60404-9:2018;
- insertion du Tableau 3 - Tolérances sur l'épaisseur nominale;
- modification de la longueur de l'éprouvette pour la détermination des caractéristiques géométriques de 2 m à 1 m.

General Information

• Status: Published
• Publication Date: 20-Sep-2022
• ICS: 17.220.20 - Measurement of electrical and magnetic quantities
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: WG 1 - TC 68/WG 1
• Current Stage: PPUB - Publication issued
• Start Date: 24-Oct-2022
• Completion Date: 21-Sep-2022

Relations

• Revises: IEC 60404-8-4:2013 - Magnetic materials - Part 8-4: Specifications for individual materials - Cold-rolled non-oriented electrical steel strip and sheet delivered in the fully-processed state
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60404-8-4 ®
Edition 4.0 2022-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state

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.

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About the IEC
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International Standards for all electrical, electronic and related technologies.

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IEC 60404-8-4 ®
Edition 4.0 2022-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20; 29.030 ISBN 978-2-8322-5735-7

– 2 – IEC 60404-8-4:2022 RLV © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 8
5 Designation . 9
6 General requirements . 10
6.1 Production process . 10
6.2 Form of supply . 10
6.3 Delivery condition . 10
6.4 Surface condition . 10
6.5 Suitability for cutting . 11
7 Technical requirements . 11
7.1 Magnetic properties . 11
7.1.1 General . 11
7.1.2 Magnetic polarization . 11
7.1.3 Specific total loss . 15
7.1.4 Anisotropy of loss . 15
7.2 Geometrical characteristics and tolerances . 15
7.2.1 Thickness . 15
7.2.2 Width . 16
7.2.3 Length . 17
7.2.4 Edge wave (wave factor) . 17
7.2.5 Flatness (wave factor) .
7.2.5 Residual curvature . 18
7.2.6 Edge camber . 18
7.3 Technological characteristics . 18
7.3.1 Density . 18
7.3.2 Stacking factor. 18
7.3.3 Number of bends . 19
7.3.4 Deviation from the shearing line (internal stress) . 19
8 Inspection and testing . 19
8.1 General . 19
8.2 Selection of samples . 19
8.3 Preparation of test specimens . 20
8.3.1 Magnetic properties . 20
8.3.2 Geometrical characteristics and tolerances . 20
8.3.3 Technological characteristics . 21
8.4 Test methods . 21
8.4.1 General . 21
8.4.2 Magnetic properties . 21
8.4.3 Geometrical characteristics and tolerances . 22
8.4.4 Technological characteristics . 22
8.5 Retests . 23

9 Marking, labelling and packaging . 23
10 Complaints . 23
11 Information to be supplied by the purchaser . 23
Annex A (informative) Non-specified magnetic properties . 25
Annex B (informative) European steel numbers .
Annex B (informative) Calculation of density values Calculated density of non-oriented
electrical steel . 27
Bibliography . 28

Table 1 – Technological properties and magnetic properties (magnetic properties are
measured by using the Epstein method according to IEC 60404-2) . 12
Table 2 – Technological properties and magnetic properties measured by the Epstein
method for strip and sheet of nominal thickness 0,47 mm for use at 60 Hz only
(magnetic properties are measured using the Epstein method according to
IEC 60404-2) . 14
Table 3 – Tolerances on nominal thickness . 16
Table 4 – Tolerances on nominal width . 17
Table A.1 – Non-specified magnetic properties . 25

– 4 – IEC 60404-8-4:2022 RLV © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-4: Specifications for individual materials –
Cold-rolled non-oriented electrical steel strip and sheet
delivered in the fully-processed state

FOREWORD
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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
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This redline version of the official IEC Standard allows the user to identify the changes made to
the previous edition IEC 60404-8-4:2013. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.

IEC 60404-8-4 has been prepared by IEC technical committee 68: Magnetic alloys and steels.
It i
...

IEC 60404-8-4 ®
Edition 4.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state

Matériaux magnétiques –
Partie 8-4: Spécifications pour matériaux particuliers – Bandes et tôles
magnétiques en acier à grains non orientés, laminées à froid et livrées à l'état
fini
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
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About the IEC
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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.

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IEC 60404-8-4 ®
Edition 4.0 2022-09
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented

electrical steel strip and sheet delivered in the fully-processed state

Matériaux magnétiques –
Partie 8-4: Spécifications pour matériaux particuliers – Bandes et tôles

magnétiques en acier à grains non orientés, laminées à froid et livrées à l'état

fini
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.220.20; 29.030 ISBN 978-2-8322-5708-1

– 2 – IEC 60404-8-4:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 9
5 Designation . 9
6 General requirements . 9
6.1 Production process . 9
6.2 Form of supply . 9
6.3 Delivery condition . 10
6.4 Surface condition . 10
6.5 Suitability for cutting . 10
7 Technical requirements . 10
7.1 Magnetic properties . 10
7.1.1 General . 10
7.1.2 Magnetic polarization . 11
7.1.3 Specific total loss . 15
7.1.4 Anisotropy of loss . 15
7.2 Geometrical characteristics and tolerances . 15
7.2.1 Thickness . 15
7.2.2 Width . 16
7.2.3 Length . 17
7.2.4 Edge wave (wave factor) . 17
7.2.5 Residual curvature . 17
7.2.6 Edge camber . 17
7.3 Technological characteristics . 17
7.3.1 Density . 17
7.3.2 Stacking factor. 18
7.3.3 Number of bends . 18
7.3.4 Deviation from the shearing line (internal stress) . 18
8 Inspection and testing . 18
8.1 General . 18
8.2 Selection of samples . 18
8.3 Preparation of test specimens . 19
8.3.1 Magnetic properties . 19
8.3.2 Geometrical characteristics and tolerances . 19
8.3.3 Technological characteristics . 19
8.4 Test methods . 20
8.4.1 General . 20
8.4.2 Magnetic properties . 20
8.4.3 Geometrical characteristics and tolerances . 21
8.4.4 Technological characteristics . 21
8.5 Retests . 22
9 Marking, labelling and packaging . 22

10 Complaints . 22
11 Information to be supplied by the purchaser . 22
Annex A (informative) Non-specified magnetic properties . 24
Annex B (informative) Calculated density of non-oriented electrical steel . 25
Bibliography . 26

Table 1 – Technological properties and magnetic properties (magnetic properties are
measured using the Epstein method according to IEC 60404-2) . 12
Table 2 – Technological properties and magnetic properties for strip and sheet of
nominal thickness 0,47 mm for use at 60 Hz only (magnetic properties are measured
using the Epstein method according to IEC 60404-2) . 14
Table 3 – Tolerances on nominal thickness . 16
Table 4 – Tolerances on nominal width . 16
Table A.1 – Non-specified magnetic properties . 24

– 4 – IEC 60404-8-4:2022 © IEC 2022
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-4: Specifications for individual materials –
Cold-rolled non-oriented electrical steel strip and sheet
delivered in the fully-processed state

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 poss
...