IEC 60404-8-8:2017
(Main)Magnetic materials - Part 8-8: Specifications for individual materials - Thin electrical steel strip and sheet for use at medium frequencies
Magnetic materials - Part 8-8: Specifications for individual materials - Thin electrical steel strip and sheet for use at medium frequencies
IEC 60404-8-8:2017(E) defines the grades of thin non-oriented electrical steel strip and sheet in nominal thicknesses of 0,05 mm, 0,10 mm, 0,15 mm, 0,20 mm, 0,25 mm, 0,30 mm and 0,35 mm and of thin grain-oriented electrical steel strip and sheet in nominal thicknesses of 0,05 mm, 0,10 mm, 0,15 mm and 0,18 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics and tolerances, technological characteristics, as well as inspection procedures.
NOTE For thin non-oriented electrical steel strip and sheet, other nominal thicknesses (i.e. 0,12 mm, 0,18 mm, 0,23 mm and 0,27 mm) can be agreed between the manufacturer and the purchaser.
This document applies to electrical steel strip and sheet supplied in the finally annealed condition in coils or sheets and intended for the construction of magnetic circuits predominantly used at frequencies in the range from 100 Hz to 10 kHz.
This edition includes the following significant technical changes with respect to the previous edition:
- extension of the range of electrical steels to include the improved grades.
General Information
Standards Content (Sample)
IEC 60404-8-8 ®
Edition 2.0 2017-09
INTERNATIONAL
STANDARD
Magnetic materials –
Part 8-8: Specifications for individual materials – Thin electrical steel strip and
sheet for use at medium frequencies
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.
IEC Central Office Tel.: +41 22 919 02 11
3, rue de Varembé Fax: +41 22 919 03 00
CH-1211 Geneva 20 info@iec.ch
Switzerland www.iec.ch
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 corrigenda or an amendment might have been published.
IEC Catalogue - webstore.iec.ch/catalogue Electropedia - www.electropedia.org
The stand-alone application for consulting the entire The world's leading online dictionary of electronic and
bibliographical information on IEC International Standards, electrical terms containing 20 000 terms and definitions in
Technical Specifications, Technical Reports and other English and French, with equivalent terms in 16 additional
documents. Available for PC, Mac OS, Android Tablets and languages. Also known as the International Electrotechnical
iPad. Vocabulary (IEV) online.
IEC publications search - www.iec.ch/searchpub IEC Glossary - std.iec.ch/glossary
The advanced search enables to find IEC publications by a 65 000 electrotechnical terminology entries in English and
variety of criteria (reference number, text, technical French extracted from the Terms and Definitions clause of
committee,…). It also gives information on projects, replaced IEC publications issued since 2002. Some entries have been
and withdrawn publications. collected from earlier publications of IEC TC 37, 77, 86 and
CISPR.
IEC Just Published - webstore.iec.ch/justpublished
Stay up to date on all new IEC publications. Just Published IEC Customer Service Centre - webstore.iec.ch/csc
details all new publications released. Available online and If you wish to give us your feedback on this publication or
also once a month by email. need further assistance, please contact the Customer Service
Centre: csc@iec.ch.
IEC 60404-8-8 ®
Edition 2.0 2017-09
INTERNATIONAL
STANDARD
Magnetic materials –
Part 8-8: Specifications for individual materials – Thin electrical steel strip and
sheet for use at medium frequencies
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030 ISBN 978-2-8322-4805-8
– 2 – IEC 60404-8-8:2017 IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 7
5 Designation . 7
6 General requirements . 7
6.1 Production process . 7
6.2 Form of supply . 7
6.3 Delivery condition . 8
6.4 Surface condition . 8
6.5 Suitability for cutting . 8
7 Technical requirements . 9
7.1 Magnetic properties . 9
7.1.1 Magnetic polarization . 9
7.1.2 Specific total loss . 10
7.2 Geometric characteristics and tolerances . 10
7.2.1 Thickness . 10
7.2.2 Width . 12
7.2.3 Edge camber . 12
7.2.4 Residual curvature . 12
7.2.5 Burr height . 13
7.3 Technological characteristics . 13
7.3.1 Density . 13
7.3.2 Stacking factor. 13
7.3.3 Number of bends . 13
7.3.4 Insulation coating resistance . 13
8 Inspection and testing . 13
8.1 General . 13
8.2 Selection of samples . 14
8.3 Preparation of test specimens . 14
8.3.1 Magnetic properties . 14
8.3.2 Geometrical characteristics and tolerances . 15
8.3.3 Technological characteristics . 15
8.4 Test methods . 15
8.4.1 General . 15
8.4.2 Magnetic properties . 15
8.4.3 Geometrical characteristics and tolerances . 16
8.4.4 Technological characteristics . 16
8.5 Retests . 17
9 Marking, labelling and packaging . 17
10 Complaints . 17
11 Information to be supplied by the purchaser . 17
Annex A (informative) Optional stacking factor for non-oriented coated products . 18
Annex B (informative) Optional magnetic specifications . 19
Annex C (informative) Calculation of density values . 20
Bibliography . 21
Table 1 – Magnetic and technological characteristics of non-oriented electrical steel
strip and sheet . 9
Table 2 – Magnetic and technological characteristics of grain-oriented electrical steel
strip and sheet . 10
Table 3 – Thickness tolerances . 11
Table 4 – Width tolerance of non-oriented strip and sheet . 12
Table 5 – Width tolerance of grain oriented electrical steel products . 12
Table A.1 – Optional stacking factor for non-oriented coated products . 18
Table B.1 – Optional magnetic specifications for non-oriented electrical steel strip and
sheet . 19
– 4 – IEC 60404-8-8:2017 IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-8: Specifications for individual materials –
Thin electrical steel strip and sheet for use at medium frequencies
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.
International Standard IEC 60404-8-8 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This second edition cancels and replaces the first edition published in 1991.
This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
– extension of the range of electrical steels to include the improved grades.
The text of this International Standard is based on the following documents:
CDV Report on voting
68/546/CDV 68/562/RVC
Full informatio
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.