IEC 60404-8-7:2017

Magnetic materials - Part 8-7: Specifications for individual materials - Cold-rolled grain-oriented electrical steel strip and sheet delivered in the fully processed state

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

• Status: Published
• Publication Date: 14-Sep-2017
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 09-Sep-2020

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)
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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
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– 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

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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

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– 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

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6) All users should ensure that they have the latest edition of this publication.

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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.
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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.
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– 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
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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 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".

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– 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
...