IEC 60404-8-7:2017
(Main)Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully processed state
Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully processed state
IEC 60404-8-7:2017 is available as IEC 60404-8-7:2017 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 60404-8-7:2017 defines the grades of cold-rolled grain-oriented electrical steel strip and sheet in nominal thicknesses of 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedures. This document applies to Goss textured grain-oriented electrical steel strip and sheet supplied in the final annealed condition in coils or sheets, and intended for the construction of magnetic circuits.
The grades are grouped into two classes:
– conventional grades;
– high permeability grades, including grades which may be delivered in the domain refined condition. They correspond to Class C22 of IEC 60404-1.
This fourth edition cancels and replaces the third edition published in 2008. 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.
General Information
Standards Content (sample)
IEC 60404-8-7
Edition 4.0 2017-09
INTERNATIONAL
STANDARD
Magnetic materials –
Part 8-7: Specifications for individual materials – Cold-rolled grain-oriented
electrical steel strip and sheet delivered in the fully-processed state
IEC 60404-8-7:2017-09(en)
---------------------- Page: 1 ----------------------
THIS PUBLICATION IS COPYRIGHT PROTECTED
Copyright © 2017 IEC, Geneva, Switzerland
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.---------------------- Page: 2 ----------------------
IEC 60404-8-7
Edition 4.0 2017-09
INTERNATIONAL
STANDARD
Magnetic materials –
Part 8-7: Specifications for individual materials – Cold-rolled grain-oriented
electrical steel strip and sheet delivered in the fully-processed state
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030 ISBN 978-2-8322-4804-1
Warning! Make sure that you obtained this publication from an authorized distributor.
® Registered trademark of the International Electrotechnical Commission---------------------- Page: 3 ----------------------
– 2 – IEC 60404-8-7:2017 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 ...................................................................................................... 8
6.1 Production process ................................................................................................. 8
6.2 Form of supply ........................................................................................................ 8
6.3 Delivery condition ................................................................................................... 9
6.4 Surface condition .................................................................................................... 9
6.5 Suitability for cutting ............................................................................................... 9
7 Technical requirements ................................................................................................... 9
7.1 Magnetic properties ................................................................................................ 9
7.1.1 General ........................................................................................................... 9
7.1.2 Magnetic polarization ....................................................................................... 9
7.1.3 Specific total loss ............................................................................................ 9
7.2 Geometric characteristics and tolerances .............................................................. 11
7.2.1 Thickness ...................................................................................................... 11
7.2.2 Width ............................................................................................................. 12
7.2.3 Length ........................................................................................................... 12
7.2.4 Edge camber ................................................................................................. 12
7.2.5 Edge wave (wave factor) ............................................................................... 13
7.2.6 Residual curvature ......................................................................................... 13
7.2.7 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 Internal stresses ............................................................................................ 13
7.3.5 Insulation coating resistance ......................................................................... 13
8 Inspection and testing .................................................................................................... 14
8.1 General ................................................................................................................. 14
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 ........................................................................................................ 16
8.4.1 General ......................................................................................................... 16
8.4.2 Magnetic properties ....................................................................................... 16
8.4.3 Geometrical characteristics and tolerances .................................................... 16
8.4.4 Technological characteristics ......................................................................... 16
8.5 Retests ................................................................................................................. 17
9 Marking, labelling and packaging ................................................................................... 17
---------------------- Page: 4 ----------------------IEC 60404-8-7:2017 IEC 2017 – 3 –
10 Complaints .................................................................................................................... 17
11 Information to be supplied by the purchaser .................................................................. 17
Bibliography .......................................................................................................................... 19
Table 1 – Technological and magnetic properties of the conventional grades of grain-
oriented electrical steel strip and sheet ................................................................................. 10
Table 2 – Technological and magnetic properties of the high permeability grades of
grain-oriented electrical steel strip and sheet ........................................................................ 11
Table 3 – Tolerances on nominal width ................................................................................. 12
---------------------- Page: 5 ----------------------– 4 – IEC 60404-8-7:2017 IEC 2017
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-7: Specifications for individual materials –
Cold-rolled grain-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 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 60404-8-7 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.This fourth edition cancels and replaces the third edition published in 2008. 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.
---------------------- Page: 6 ----------------------
IEC 60404-8-7:2017 IEC 2017 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
68/545/CDV 68/561/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60404 series, published under the general title Magnetic
materials, can be found on the IEC website.The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.
---------------------- Page: 7 ----------------------
– 6 – IEC 60404-8-7:2017 IEC 2017
MAGNETIC MATERIALS –
Part 8-7: Specifications for individual materials –
Cold-rolled grain-oriented electrical steel strip
and sheet delivered in the fully-processed state
1 Scope
This part of IEC 60404 defines the grades of cold-rolled grain-oriented electrical steel strip
and sheet in nominal thicknesses of 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular,
it gives general requirements, magnetic properties, geometric characteristics, tolerances and
technological characteristics, as well as inspection procedures.This document applies to Goss textured grain-oriented electrical steel strip and sheet supplied
in the final annealed condition in coils or sheets, and intended for the construction of
magnetic circuits.The grades are grouped into two classes:
– conventional grades;
– high permeability grades, including grades which may be delivered in the domain refined
condition.They correspond to Class C22 of IEC 60404-1.
2 Normative references
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.IEC 60050-121, International Electrotechnical Vocabulary – Part 121: Electromagnetism
(available at http://www.electropedia.org/)IEC 60050-221, International Electrotechnical Vocabulary – Chapter 221: Magnetic materials
and components (available at http://www.electropedia.org/)IEC 60404-1, Magnetic materials – Part 1: Classification
IEC 60404-2, Magnetic materials – Part 2: Methods of measurement of the magnetic
properties of electrical steel sheet and strip by means of an Epstein frame
IEC 60404-3:1992, Magnetic materials – Part 3: Methods of measurement of the magnetic
properties of magnetic sheet and strip by means of a single sheet testerIEC 60404-3:1992/AMD1:2002
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of magnetic steel sheet and stripIEC 60404-13, Magnetic materials – Part 13: Methods of measurement of density, resistivity
and stacking factor of electrical steel sheet and strip---------------------- Page: 8 ----------------------
IEC 60404-8-7:2017 IEC 2017 – 7 –
ISO 404, Steel and steel products – General technical delivery requirements
ISO 7799, Metallic materials – Sheet and strip 3 mm thick or less – Reverse bend test
ISO 10474, Steel and steel products – Inspection documents3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-121 and
IEC 60050-221 and the following apply.ISO and IEC maintain terminological databases for use in standardization at the following
addresses:• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
edge camber
greatest distance between a longitudinal edge of a length of strip or a sheet and the line
joining the two extremities of the measured length of this edgeNote 1 to entry: See IEC 60404-9.
3.2
edge wave
wave factor
variations of flatness of a length of strip or a sheet taking a form of waves at the slit edge of
the productNote 1 to entry: The edge wave is characterized by the wave factor which is the relation of the height of the wave
to its length, expressed as a percentage.3.3
number of bends
number of alternate bends possible before the appearance of the first crack in the base metal
visible to the naked eyeNote 1 to entry: The number of bends constitutes an indication of the ductility of the product.
3.4internal stresses
stresses which are characterized by a deviation in relation to the line of cutting
4 ClassificationThe grades covered by this document are classified according to the value of maximum
specific total loss in watts per kilogram and according to the nominal thickness of the product
(0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm).5 Designation
The steel name comprises the following in the order given:
___________
In the rest of the document, the word "product" is used to mean "strip and sheet".
---------------------- Page: 9 ----------------------– 8 – IEC 60404-8-7:2017 IEC 2017
1) the letter M for electrical steel;
2) one hundred times the specified value of maximum specific total loss at 1,7 T and 50 Hz,
in watts per kilogram;3) one hundred times the nominal thickness of the product, in millimetres;
4) the characteristic letter
– S for conventional grades;
– P for high permeability grades;
5) one tenth of the frequency 50 Hz, i.e. 5.
EXAMPLE M140-30S5 for cold-rolled grain-oriented electrical steel strip or sheet of conventional grade with a
maximum specific total loss of 1,40 W/kg at 1,7 T and 50 Hz, and a nominal thickness of 0,30 mm, supplied in the
fully-processed state.6 General requirements
6.1 Production process
The production process of the steel and its chemical composition are left to the discretion of
the manufacturer.6.2 Form of supply
The product is supplied in coils in the case of strip and in bundles in the case of sheets.
The mass of the coils or bundles of sheets shall be agreed between the manufacturer and
purchaser at the time of enquiry and order.The recommended value for the internal diameter of coils is approximately 508 mm.
Strip shall be of constant width and wound in such a manner that the edges are superimposed
in a regular manner and the side faces of the coil are substantially flat.Coils shall be sufficiently tightly wound in order that they do not collapse under their own
weight.Strip may exhibit welds or interleaves resulting from the removal of defective zones if agreed
between the manufacturer and purchaser at the time of enquiry and order. If necessary, the
marking of welds or interleaves may be agreed between the manufacturer and purchaser at
the time of enquiry and order.For coils containing repair welds or interleaves, each part of the strip shall be of the same
grade.The edges of parts welded together shall not be so much out of alignment as to affect the
further processing of the product.Sheets which make up each bundle sh
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.