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 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
Relations
Overview
IEC 60404-8-7:2017 is an international standard that specifies requirements for cold-rolled grain-oriented electrical steel strip and sheet supplied in the fully processed (final annealed) state. It applies to Goss textured grain-oriented electrical steel in nominal thicknesses of 0.23 mm, 0.27 mm, 0.30 mm and 0.35 mm, supplied as coils or sheets for the construction of magnetic circuits. The fourth edition (2017) updates the previous (2008) edition and extends the range to include improved grades.
Key topics
- Material classes: Defines two classes - conventional grades and high permeability grades (including domain refined variants). These correspond to Class C22 of IEC 60404‑1.
- Magnetic properties: Requirements for magnetic polarization and specific total loss (measured at 1.7 T, 50 Hz). The standard also prescribes how the steel name/designation is formed (includes a code based on 100 × specified max specific total loss).
- Geometric characteristics & tolerances: Nominal thicknesses, tolerances on width, length, edge camber, edge wave, residual curvature and burr height.
- Technological characteristics: Tests and limits for stacking factor, density, number of bends (ductility), internal stresses, and insulation coating resistance.
- Form of supply & delivery condition: Coils or sheets in the final annealed state, with surface condition and suitability-for-cutting requirements.
- Inspection & test procedures: Sampling, specimen preparation and test methods. Measurement references include IEC methods for Epstein frames and single sheet testers.
- Marking, labelling and packaging, plus procedures for complaints and purchaser information.
Practical applications
IEC 60404-8-7 is intended for organizations involved in the manufacture, specification, testing and use of grain‑oriented electrical steel:
- Transformer and reactor manufacturers specifying low-loss, high-permeability core steels to optimize efficiency and reduce core losses.
- Steel producers and slitters ensuring delivered coils/sheets meet magnetic, dimensional and surface tolerances.
- Quality and procurement engineers verifying supplier data, inspection reports and conformity to international requirements.
- Test laboratories carrying out magnetic loss, polarization and geometric measurements per IEC-referenced methods.
Benefits include consistent magnetic performance, predictable core losses, improved interoperability across suppliers, and clearer purchase and acceptance criteria for critical magnetic circuits.
Related standards
- IEC 60404‑1 (classification)
- IEC 60404‑2, IEC 60404‑3 (magnetic measurement methods - Epstein frame / single sheet tester)
- IEC 60404‑9, IEC 60404‑13 (geometrical and technological measurement methods)
- ISO 404, ISO 7799, ISO 10474 (general steel delivery and mechanical test references)
Keywords: IEC 60404-8-7, cold-rolled grain-oriented electrical steel, Goss texture, specific total loss, high permeability grades, electrical steel strip and sheet.
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
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 60404-8-7 ®
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
– 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
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
– 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.
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.
– 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 tester
IEC 60404-3:1992/AMD1:2002
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of magnetic steel sheet and strip
IEC 60404-13, Magnetic materials – Part 13: Methods of measurement of density, resistivity
and stacking factor of electrical steel sheet and strip
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 documents
3 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 edge
Note 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 product
Note 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 eye
Note 1 to entry: The number of bends constitutes an indication of the ductility of the product.
3.4
internal stresses
stresses which are characterized by a deviation in relation to the line of cutting
4 Classification
The 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".
– 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
...
IEC 60404-8-7 ®
Edition 4.0 2017-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Magnetic materials –
Part 8-7: Specifications for individual materials – Cold-rolled grain-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.
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 60404-8-7 ®
Edition 4.0 2017-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
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 978-2-8322-4837-9
– 2 – IEC 60404-8-7:2017 RLV IEC 2017
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Classification . 8
5 Designation . 8
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 . 10
7.2 Geometric characteristics and tolerances . 11
7.2.1 Thickness . 11
7.2.2 Width . 12
7.2.3 Length . 13
7.2.4 Edge camber . 13
7.2.5 Flatness 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 . 14
8 Inspection and testing . 14
8.1 General . 14
8.2 Selection of samples . 14
8.3 Preparation of test specimens . 15
8.3.1 Magnetic properties . 15
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 . 17
8.5 Retests . 17
9 Marking, labelling and packaging . 17
10 Complaints . 18
11 Information to be supplied by the purchaser . 18
Annex A (informative) European steel designation .
Bibliography . 20
Table 1 – Technological and magnetic properties of the conventional grades of grain-
oriented material electrical steel strip and sheet . 10
Table 2 – Technological and magnetic properties of the high permeability grades of
grain-oriented material electrical steel strip and sheet . 11
Table 3 – Tolerances on nominal width . 12
– 4 – IEC 60404-8-7:2017 RLV 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.
This redline version of the official IEC Standard allows the user to identify the changes
made to the previous edition. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
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.
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.
IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this publication using a colour printer.
– 6 – IEC 60404-8-7:2017 RLV 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 60404-1-1, Magnetic materials – Part 1-1: Classification - Surface insulations of electrical
steel sheet, strip and laminations
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 tester
IEC 60404-3:1992/AMD1:2002
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of magnetic steel sheet and strip
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 measurement of density, resistivity
and stacking factor of electrical steel sheet and strip
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 documents
3 Terms and definitions
For the purposes of this document, the terms and definitions of the principal terms relating to
magnetic properties 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 edge
Note 1 to entry: See IEC 60404-9.
3.2
flatness (wave factor)
the property of a sheet or of a length of strip which is characterized by the wave factor, i.e. by
the relation of the height of the wave to its length
NOTE 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 product
Note 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 eye
Note 1 to entry: The number of bends constitutes an indication of the ductility of the material product.
3.4
internal stresses
stresses which are characterized by a deviation in relation to the line of cutting
– 8 – IEC 60404-8-7:2017 RLV IEC 2017
4 Classification
The 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 material
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:
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 and corresponding to the nominal product thickness;
3) one hundred times the nominal thickness of the material 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.
NOTE The corresponding steel numbers used in the relevant European Standard are given in Annex A.
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 material 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 ordering 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.
___________
In the rest of the document, the word "material product" is used to mean "strip and sheet".
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 material product.
Sheets which make up each bundle shall be stacked so that the side faces are substantially
flat and approximately perpendicular to the top face.
6.3 Delivery condition
Cold-rolled grain-oriented electrical steel material is products are usually supplied with an
insulating coating on both sides. This coating generally consists of an EC-5-G coating on an
EC-2 coating in accordance with IEC 60404-1-1 .
6.4 Surface condition
The surfaces shall be smooth and clean, free from grease and rust . Dispersed defects such
as scratches, blisters, cracks, etc. are permitted if they are within the limits of the tolerances
on thickness and if they are not detrimental to the correct use of the supplied material
product.
The insulation coating present on the surface of the material product shall be sufficiently
adherent so that it does not become detached during cutting operations or heat treatment
under conditions specified by the supplier.
NOTE If the product is to be immersed in a fluid, an agreement between the manufacturer and
purchaser, initiated by the purchaser, should be reached to ensure compatibility between the
fluid and the coating.
6.5 Suitability for cutting
The material product shall be suitable for cutting accurately into the usual shapes at any point
when appropriate cutting tools are used.
7 Technical requirements
7.1 Magnetic properties
7.1.1 General
The properties defined in 7.1.2 and 7.1.3 shall apply to materials products in the delivery
condition defined in 6.3 and to the aged condition defined in 8.3.1.
The Epstein strips shall receive a stress relief heat treatment after cutting under conditions
specified by the manufacturer.
The single sheet test specimens shall not be heat treated.
7.1.2 Magnetic polarization
The specified minimum values of peak magnetic polarization at the peak magnetic field
strength of 800 A/m at 50 Hz or 60 Hz shall be as given in Table 1 and Table 2.
___________
Other types of coating exist which are used only when particularly specified.
Not to be confused with some coloration of the insulating coating inherent to the manufacturing process.
– 10 – IEC 60404-8-7:2017 RLV IEC 2017
7.1.3 Specific total loss
The specified values of maximum specific total loss at 50 Hz or 60 Hz shall be as given in
Table 1 and Table 2.
Table 1 – Technological and magnetic properties of the conventional
grades of grain-oriented material electrical steel strip and sheet
Steel name Nominal Maximum specific total Maximum specific total Minimum Minimum
thickness loss at 1,5 T loss at 1,7 T magnetic stacking
polarization for factor
a
W/kg W/kg H = 800 A/m
mm 50 Hz 60 Hz 50 Hz 60 Hz T
M110-23S5 0,73 0,96 1,10 1,45 1,78
0,23 0,945
M120-23S5 0,77 1,01 1,20 1,57 1,78
M110-27S5 0,77 1,02 1,10 1,48 1,80
M120-27S5 0,27 0,80 1,07 1,20 1,58 1,78 0,950
M130-27S5 0,85 1,12 1,30 1,68 1,78
M120-30S5 0,83 1,13 1,20 1,58 1,80
M130-30S5 0,30 0,85 1,15 1,30 1,71 1,78 0,955
M140-30S5 0,92 1,21 1,40 1,83 1,78
M135-35S5 0,97 1,29 1,35 1,78 1,80
M145-35S5 0,35 1,03 1,36 1,45 1,91 1,78 0,960
M155-35S5 1,07 1,41 1,55 2,04 1,78
a
It has been common practice for many years to give values of magnetic flux density. In fact the Epstein frame
is used to determine magnetic polarization (intrinsic flux density) which is defined as
J = B – µ H
where
J is the magnetic polarization;
B is the magnetic flux density;
–7 –1
µ is the magnetic constant: 4 π x 10 H·m ;
H is the magnetic field strength.
NOTE The difference between B and J at 800 A/m is equal to 0,001 T.
Table 2 – Technological and magnetic properties of the high permeability
grades of grain-oriented material electrical steel strip and sheet
Steel name Nominal Maximum specific total loss Minimum Minimum
thickness at 1,7 T magnetic stacking
polarization for factor
a
W/kg H = 800 A/m
mm 50 Hz 60 Hz T
b
M80-23P5 0,80 1,05 1,85
b
M85-23P5 0,85 1,12 1,85
b
M90-23P5 0,23 0,90 1,19 1,85 0,945
M95-23P5 0,95 1,25 1,85
M100-23P5 1,00 1,32 1,85
b
M90-27P5 0,90 1,19 1,85
b
M95-27P5 0,95 1,25 1,85
0,27 0,950
M100-27P5 1,00 1,32 1,88
M110-27P5 1,10 1,45 1,88
M100-30P5 1,00 1,30 1,88
M105-30P5 1,05 1,38 1,88
M110-30P5 0,30 1,10 1,46 1,88 0,955
M115-30P5 1,15 1,52 1,85
M120-30P5 1,20 1,58 1,85
M115-35P5 1,15 1,51 1,88
M125-35P5 0,35 1,25 1,64 1,88 0,960
M135-35P5 1,35 1,77 1,88
a
It has been common practice for many years to give values of magnetic flux density. In fact the Epstein frame
is used to determine magnetic polarization (intrinsic flux density) which is defined as
J = B – µ0H
where
J is the magnetic polarization;
B is the magnetic flux density;
–7 –1
µ is the magnetic constant: 4 π x 10 H·m ;
H is the magnetic field strength.
NOTE The difference between B and J at 800 A/m is equal to 0,001 T.
b
This grade may be delivered in the domain refined condition. Domain refined products shall be distinct from
non-refined products, see Clause 11 l). The magnetic properties of some domain refined material products
may deteriorate when the material product is subjected to heat treatment.
7.2 Geometric characteristics and tolerances
7.2.1 Thickness
The nominal thicknesses of the material product are 0,23 mm, 0,27 mm, 0,30 mm and
0,35 mm.
For thickness tolerance, a distinction is made between
– the allowable tolerance on the nominal thickness within the same acceptance unit;
– the difference in thickness in a sheet or in a length of strip in a direction parallel to the
direction of rolling;
– 12 – IEC 60404-8-7:2017 RLV IEC 2017
– the difference in thickness in a direction perpendicular to the direction of rolling. This
tolerance applies only to materials products with a width greater than 150 mm.
At any point, the allowable tolerance on deviation from the nominal thickness within the same
acceptance unit shall not exceed ± 0,030 mm except for the 0,23 mm thickness for which this
tolerance shall not exceed ± 0,025 mm. The additional thickness due to welds with respect to
the measured thickness of the steel sheet or strip product shall not exceed 0,050 mm.
The difference in thickness in a sheet or in a length of strip of 2 m in a direction parallel to the
direction of rolling shall not exceed 0,030 mm.
In addition, for material products with a width greater than 150 mm, the difference in thickness
in a direction perpendicular to the direction of rolling shall not exceed 0,020 mm, the
measurements being made at least 40 mm from the edges (see 8.4.3.1). For narrow strips,
other agreements may be needed.
7.2.2 Width
The commonly available nominal widths are less than or equal to 1 000 mm.
The material product can be supplied either in a width chosen from the specific range of the
manufacturer or in the finally used width.
For width tolerances
- For material products supplied in a width chosen from the specific range of the
+ 2
manufacturer, the permitted tolerances shall be mm.
- For material products supplied in the finally used width, the tolerances of Table 3 shall
apply.
Table 3 – Tolerances on nominal width
a
Tolerance
Nominal width l
mm mm
l ≤ 150
–0,2
150 < l ≤ 400
–0,3
400 < l ≤ 750
–0,5
b
750 < l ≤ 1 000
–0,6
NOTE
a
By agreement between the manufacturer and the purchaser at the time of
enquiry and order, the tolerances on the nominal width can be all positive
tolerances.
b
Nominal widths greater than 1 000 mm may be delivered. In this case, the tolerance
should be agreed between the manufacturer and the purchaser at the time of enquiry and
order.
7.2.3 Length
+0,5
The tolerance on the length of sheets in relation to the length ordered shall be %, but with
a maximum of 6 mm.
7.2.4 Edge camber
The verification of edge camber does not apply to material products of width less than or
equal to 150 mm. The edge camber shall not exceed 0,9 mm for a measuring length of 2 m.
7.2.5 Flatness Edge wave (wave factor)
The verification of the flatness edge wave does not apply to material products of width less
than or equal to 150 mm. The wave factor (see 8.4.3.4), expressed as a percentage, shall not
exceed 1,5 %.
7.2.6 Residual curvature
A requirement concerning residual curvature may be specified by agreement between the
manufacturer and the purchaser when ordering material products of width greater than
150 mm.
In this case the distance between the bottom edge of the test piece and the supporting plate
shall not exceed 35 mm for sheets and shall be subject to agreement for coils.
7.2.7 Burr height
The determination of the burr height applies only to material slit coils delivered in the width in
which it they will finally be used. The measured burr height shall not exceed 0,025 mm.
7.3 Technological characteristics
7.3.1 Density
The density of the material cold-rolled grain-oriented electrical steel is not specified.
The conventional value of density used to calculate the magnetic properties and the stacking
factor shall be 7,65 kg/dm .
7.3.2 Stacking factor
The minimum values shall be as specified in Table 1 and Table 2.
7.3.3 Number of bends
The specified minimum number of bends is 1. This value applies to test specimens cut parallel
to the direction of rolling.
7.3.4 Internal stresses
The material products shall be, as far as possible, free from internal stresses.
The verification of internal stress is not applicable to material a product of width less than
500 mm (slit material coil). The measured gap shall not exceed 1 mm (see 8.3.3.3).
– 14 – IEC 60404-8-7:2017 RLV IEC 2017
7.3.5 Insulation coating resistance
.
The insulation coating resistance expressed in Ω mm represents the electrical resistance
offered to the passage of current through the coating.
A minimum value of the insulation coating resistance measured before or after the possible
application of a stress relief heat treatment shall be the subject of agreement between the
parties when ordering.
The measured insulation coating resistance before or after the possible application of a stress
.
relief heat treatment shall be not less than 500 Ω mm / side unless otherwise agreed
between the manufacturer and the purchaser at the time of enquiry and order. The stress
relief heat treatment, when applied, shall be carried out under conditions specified by the
manufacturer.
8 Inspection and testing
8.1 General
The materials products defined by this document can be ordered with or without specific
inspection in accordance with ISO 404. However, as a dispensation from ISO 404, in the case
of an order without inspection, the manufacturer shall supply a certificate giving the specific
total loss of the supplied material product.
In the case of an order with specific inspection, the type of inspection document in
accordance with ISO 10474 shall be specified when ordering. In this case, the delivery is
divided into acceptance units.
Each acceptance unit shall comprise 3,0 t or the remaining fraction thereof of the same grade
and the same nominal thickness. Different acceptance units can be adopted by special
agreement between the manufacturer and the purchaser at the time of enquiry and order.
For coils of more than 3,0 t, each coil shall constitute an acceptance unit.
Except by special agreement, the same rules apply to the inspection of internal stresses,
suitability for cutting, surface insulation resistance and tolerances of shape and dimensions.
When the products are delivered in the form of slit coils, the test results applying to the parent
unit of acceptance shall apply.
8.2 Selection of samples
Test samples shall be taken from each acceptance unit.
The first internal turn and last external turn of a coil shall be considered as wrapping and not
as representative of the quality of the rest of the coil. The selection shall be made from the
first internal or external turns, excluding the wrapping turn and outside any welding zones or
interleaves.
In the case of sheets, the selection shall be made preferably from the upper part of the
bundle.
By choosing a suitable order for the execution of the tests, the same sample shall serve to
check the various properties.
8.3 Preparation of test specimens
8.3.1 Magnetic properties
For the measurement of magnetic polarization and specific total loss using the 25 cm Epstein
frame, the test specimen shall consist of a minimum of 24 Epstein test strips having the
following dimensions:
– length 280 mm to 320 mm, the lengths being equal within a tolerance of ± 0,5 mm;
– width 30 mm ± 0,2 mm.
As far as possible, the selection of test strips shall be made uniformly across the width of the
material product. The test strips shall be carefully cut without deformation. Cutting or
punching shall be carried out only with well sharpened tools.
Before the measurements, the test strips shall be subjected to a stress relief heat treatment in
accordance with the manufacturer's specification.
In the case where the measurement of magnetic polarization and specific total loss shall be
made using the single sheet method tester specified in IEC 60404-3 (see 8.4.2 below), the
test specimen for the single sheet tester shall consist of one sheet having the following
dimensions:
– length from 500 mm to 530 610 mm.
NOTE The value of 500 mm is recommended;
– width 500 mm mm from 300 mm to 500 mm.
- 5
It is recommended to use width values between 450 mm to 500 mm.
All the test specimens shall be cut parallel to the direction of rolling. The permitted tolerance
for the angle between the direction of rolling and the direction of cutting is ± 1°.
In the case of measurements of specific total loss on aged test pieces, these shall be aged by
heating at (225 ± 5) °C for a duration of 24 h and shall be cooled to ambient temperature.
8.3.2 Geometrical characteristics and tolerances
For the measurement of thickness, width, flatness and edge camber, the test specimen shall
consist of a sheet or a 2 m length of strip.
For the measurement of the residual curvature, the test specimen shall consist of a sample
+ 2,5
(500 ) mm in length and of width equal to the delivery width of the sheet or strip product.
8.3.3 Technological characteristics
8.3.3.1 Stacking factor
The test specimen shall consist of at least 24 strips of the same size; in case of dispute, the
test shall be made with 100 strips. They shall have a width of at least 20 mm and a surface
area of at least 5 000 mm , their widths being equal within a tolerance of ± 0,1 mm as well as
their lengths the tolerance on the width and length of strips being respectively equal to ± 0,2
mm and ± 0,5 mm. The test strips shall be carefully deburred before the test.
8.3.3.2 Number of bends
Five test specimens at least 20 mm wide shall be taken from outside the welding zones,
parallel to the direction of rolling, with a view to making the bend perpendicular to the
– 16 – IEC 60404-8-7:2017 RLV IEC 2017
direction of rolling. The edge of the material product shall not constitute one side of the test
specimen.
The test specimens shall be carefully cut without deformation.
8.3.3.3 Internal stresses
The test specimen shall consist of a sheet or 1 m length of strip.
8.3.3.4 Insulation coating resistance
For sheet or strip products with a width equal to or greater than 600 mm, four strips shall be
selected over the whole width of the material product. The width of each strip depends on the
method to be used, e.g. 50 mm for the test method in accordance with IEC 60404-11.
For sheet or strip products less than 600 mm wide, the selection for inspection of insulation
coating resistance shall be subject to agreement when ordering.
Before the measurements, depending on the agreement (see 7.3.5), the test specimen may
need to be heat-treated in accordance with the specification of the manufacturer.
8.4 Test methods
8.4.1 General
For each specified property, one test shall be carried out per acceptance unit. Unless
otherwise specified, the tests shall be made at a temperature of (23 ± 5) °C.
8.4.2 Magnetic properties
The test shall be made using a 25 cm Epstein frame in accordance with IEC 60404-2.
NOTE As an alternative to the Epstein method, the single sheet tester (SST) described in IEC 60404-3 may can
be used by agreement between the manufacturer and purchaser at the time of enquiry and order. In this case the
specified values to be obtained with the single sheet tester may can also be subject to agreement. The
relationships between the SST and Epstein test results which are given in Annex C of IEC 60404-
3:1992/AMD1:2002 may can be used as a guide.
In the case of some For the grades of domain-refined material products (see Table 2), the test
shall be made using the single sheet method of tester specified in IEC 60404-3, according to
the instructions of the manufacturer. The single sheet test specimen is not heat treated.
8.4.3 Geometrical characteristics and tolerances
8.4.3.1 Thickness
The measurement of thickness shall be made at any point located more than 40 mm from the
edges. For materials products of a width less than 80 mm, the measurement of thickness shall
be made along the longitudinal axis of the sheet or strip. This measurement shall be made
using a micrometer with an accuracy of 0,001 mm.
8.4.3.2 Width
The width shall be measured perpendicular to the longitudinal axis of the sheet or strip
product.
8.4.3.3 Edge camber
The edge camber shall be determined in accordance with IEC 60404-9.
8.4.3.4 Flatness Edge wave (wave factor)
The wave factor shall be determined in accordance with IEC 60404-9.
8.4.3.5 Residual curvature
The residual curvature in the longitudinal direction of the strip shall be determined in
accordance with IEC 60404-9.
8.4.3.6 Burr height
The burr height shall be determined in accordance with IEC 60404-9.
8.4.4 Technological characteristics
8.4.4.1 Stacking factor
The stacking factor shall be measured in accordance with IEC 60404-13.
8.4.4.2 Number of bends
The test consists of bending the test specimen through 90° alternately to each side of its
initial position, following the method of bending defined by ISO 7799. The radius of bending
chosen shall be 5 mm.
A bend of 90° from the initial position with return to the initial position counts as one bend.
The test shall be stopped on the appearance in the base metal of the first crack visible to the
naked eye. The last bend shall not be counted.
8.4.4.3 Internal stresses
The internal stresses shall be determined in accordance with IEC 60404-9.
8.4.4.4 Insulation coating resistance
The test can be carried out by different methods, among which is the method in accordance
with IEC 60404-11 on both sides of the product.
8.5 Retests
When a test does not give the specified result, this test shall be repeated on double the
number of test specimens from other sheets of the acceptance unit or on other strips from the
coils. The delivery shall be considered to conform to the order if all results of additional tests
are in accordance with the requirements of this document.
After re-treatment, the manufacturer has the right to present again for test acceptance units
which had not been found to comply with the order.
9 Marking, labelling and packaging
Marking, labelling and packaging of the products may be agreed between the manufacturer
and the purchaser at the time of ordering.
– 18 – IEC 60404-8-7:2017 RLV IEC 2017
10 Complaints
Internal or external defects shall justify a complaint only if they are clearly prejudicial to the
method of working or the judicious use of the material product.
The purchaser shall give to the manufacturer the opportunity of convincing himself of the
fairness of the claim by presenting the material product in dispute and evidence for the
complaint.
In all cases, the terms and conditions of complaints shall be in accordance with ISO 404.
11 Information to be supplied by the purchaser
For material a product to comply adequately with the requirements of this document, the
purchaser shall include the following information in his enquiry and order:
a) the quantity;
b) the type of product (strip or sheet);
c) the number of this standard (I
...
Frequently Asked Questions
IEC 60404-8-7:2017 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully processed state". This standard covers: 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.
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.
IEC 60404-8-7:2017 is classified under the following ICS (International Classification for Standards) categories: 29.030 - Magnetic materials. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60404-8-7:2017 has the following relationships with other standards: It is inter standard links to IEC 60404-8-7:2020, IEC 60404-8-7:2008. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 60404-8-7:2017 directly from iTeh Standards. The document is available in PDF format and is delivered instantly after payment. Add the standard to your cart and complete the secure checkout process. iTeh Standards is an authorized distributor of IEC standards.
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