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

IEC 60404-8-4:2013 defines the grades of cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses of 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm. It specifies general requirements, the magnetic properties, geometric characteristics and tolerances, and technological characteristics, as well as the inspection procedure. This standard applies to materials supplied in the fully annealed condition intended for the construction of magnetic circuits. It does not apply to semi-processed material. This edition includes the following significant technical changes with respect to the previous edition:
- Deletion of the dates for all normative references;
- Introduction of the new grades M210-35A 5 and M230-50A 5.

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

La CEI 60404-8-4:2013 définit les nuances de bandes et tôles magnétiques en acier à grains non orientés, laminées à froid, d'épaisseur nominale 0,35 mm, 0,50 mm, 0,65 mm et 1,00 mm. Elle spécifie les exigences générales, les caractéristiques magnétiques, les caractéristiques géométriques et les tolérances, les caractéristiques technologiques ainsi que les procédures de contrôle. La présente norme est applicable aux produits livrés après recuit final destinés à la construction de circuits magnétiques. Elle ne s'applique pas aux produits livrés à l'état semi-fini. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- Suppression des dates pour toutes les références normatives;
- Introduction des nouvelles nuances M210-35A 5 et M230-50A 5.

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Publication Date
13-May-2013
Current Stage
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Completion Date
21-Sep-2022
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IEC 60404-8-4
Edition 3.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state
Matériaux magnétiques –
Partie 8-4: Spécifications pour matériaux particuliers – Bandes et tôles
magnétiques en acier à grains non orientés, laminées à froid et livrées à l'état
fini
IEC 60404-8-4:2013
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60404-8-4
Edition 3.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state
Matériaux magnétiques –
Partie 8-4: Spécifications pour matériaux particuliers – Bandes et tôles
magnétiques en acier à grains non orientés, laminées à froid et livrées à l'état
fini
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 17.220.20; 29.030 ISBN 978-2-83220-786-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – 60404-8-4 © IEC:2013
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope ............................................................................................................................... 6

2 Normative references........................................................................................................ 6

3 Terms and definitions ....................................................................................................... 6

4 Classification .................................................................................................................... 7

5 Designation ...................................................................................................................... 7

6 General requirements ....................................................................................................... 7

6.1 Production process .................................................................................................. 7

6.2 Form of supply ......................................................................................................... 7

6.3 Delivery condition .................................................................................................... 8

6.4 Surface condition ..................................................................................................... 8

6.5 Suitability for cutting ................................................................................................ 8

7 Technical requirements ..................................................................................................... 9

7.1 Magnetic properties ................................................................................................. 9

7.1.1 General ....................................................................................................... 9

7.1.2 Magnetic polarization ................................................................................... 9

7.1.3 Specific total loss ....................................................................................... 13

7.1.4 Anisotropy of loss ...................................................................................... 13

7.2 Geometrical characteristics and tolerances ............................................................ 13

7.2.1 Thickness .................................................................................................. 13

7.2.2 Width ......................................................................................................... 14

7.2.3 Length ....................................................................................................... 14

7.2.4 Edge camber ............................................................................................. 14

7.2.5 Flatness (wave factor) ................................................................................ 15

7.2.6 Residual curvature ..................................................................................... 15

7.3 Technological characteristics ................................................................................. 15

7.3.1 Density ...................................................................................................... 15

7.3.2 Stacking factor ........................................................................................... 15

7.3.3 Number of bends ....................................................................................... 15

7.3.4 Internal stresses ........................................................................................ 15

8 Inspection and testing ..................................................................................................... 15

8.1 General ................................................................................................................. 15

8.2 Selection of samples.............................................................................................. 16

8.3 Preparation of test specimens ................................................................................ 16

8.3.1 Magnetic properties ................................................................................... 16

8.3.2 Geometrical characteristics and tolerances ................................................ 16

8.3.3 Technological characteristics ..................................................................... 17

8.4 Test methods ........................................................................................................ 17

8.4.1 General ..................................................................................................... 17

8.4.2 Magnetic properties ................................................................................... 17

8.4.3 Geometrical characteristics and tolerances ................................................ 18

8.4.4 Technological characteristics ..................................................................... 18

8.5 Retests .................................................................................................................. 18

9 Marking, labelling and packaging .................................................................................... 19

10 Complaints ..................................................................................................................... 19

11 Information to be supplied by the purchaser .................................................................... 19

---------------------- Page: 4 ----------------------
60404-8-4 © IEC:2013 – 3 –

Annex A (informative) Non-specified magnetic properties ..................................................... 20

Annex B (informative) European steel numbers .................................................................... 21

Annex C (informative) Calculation of density values .............................................................. 22

Bibliography .......................................................................................................................... 23

Table 1 – Technological properties and magnetic properties measured by the Epstein

method (1 of 2) ..................................................................................................................... 10

Table 2 – Technological properties and magnetic properties measured by the Epstein

method for strip and sheet of nominal thickness 0,47 mm for use at 60 Hz only .................... 12

Table 3 – Tolerances on nominal width .................................................................................. 14

Table A.1 – Non-specified properties ..................................................................................... 20

Table B.1 – European steel numbers ..................................................................................... 21

---------------------- Page: 5 ----------------------
– 4 – 60404-8-4 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-4: Specifications for individual materials –
Cold-rolled non-oriented electrical steel strip and
sheet delivered in the fully-processed state
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as 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 60404-8-4 has been prepared by IEC technical committee 68:

Magnetic alloys and steels, in collaboration with ISO technical committee 17: Steel.

This third edition cancels and replaces the second edition published in 1998. It constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
• Deletion of the dates for all normative references (see Clause 2);
• Introduction of the new grades M210-35A 5 and M230-50A 5 (see Table 1).
---------------------- Page: 6 ----------------------
60404-8-4 © IEC:2013 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
68/436/CDV 68/450/RVC

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

A list of all parts in the IEC 60404 series, published under the general title Magnetic materials,

can be found on the IEC website.
---------------------- Page: 7 ----------------------
– 6 – 60404-8-4 © IEC:2013
MAGNETIC MATERIALS –
Part 8-4: Specifications for individual materials –
Cold-rolled non-oriented electrical steel strip and
sheet delivered in the fully-processed state
1 Scope

This part of IEC 60404 defines the grades of cold-rolled non-oriented electrical steel strip and

sheet in nominal thicknesses of 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it

specifies general requirements, the magnetic properties, geometric characteristics and

tolerances, and technological characteristics, as well as the inspection procedure.

This standard gives in Table 2 the magnetic properties of cold-rolled non-oriented electrical

steel strip and sheet of nominal thickness 0,47 mm for use at 60 Hz only.

This standard applies to materials supplied in the fully annealed condition intended for the

construction of magnetic circuits. It does not apply to semi-processed material.
These magnetic materials correspond to class C.21 of IEC 60404-1.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and

are indispensable for its application. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments)

applies.
IEC 60050 (all parts), International Electrotechnical Vocabulary (available at
)

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 60404-9, 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 relating to magnetic properties

given in IEC 60050-121 and IEC 60050-221 and the following apply.
---------------------- Page: 8 ----------------------
60404-8-4 © IEC:2013 – 7 –
3.1
edge camber

greatest distance between a longitudinal edge of the sheet and the line joining the two

extremities of the measured length of this edge
3.2
flatness

property of a sheet or 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
3.3
number of bends

number of alternate bends possible before the appearance in the base metal of the first crack

visible to the naked eye

Note 1 to entry: The number of bends constitutes an indication of the ductility of the material.

3.4
internal stresses
deviation from the shearing line due to internal stresses
4 Classification

The grades covered by this standard are classified according to the value of maximum specific

total loss in watts per kilogram at 1,5 T and according to the nominal thickness of the material

(0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm).
5 Designation
The steel name comprises the following in the order given:
a) the letter M for electrical steel;

b) one hundred times the specified value of the maximum specific total loss, in watts per

kilogram, at 1,5 T and 50 Hz for the materials given in Table 1 and at 1,5 T and 60 Hz for

the materials given in Table 2 and corresponding to the nominal product thickness;

c) one hundred times the nominal thickness of the material, in millimetres;

d) the characteristic letter A for cold-rolled non-oriented electrical strip or sheet supplied in the

fully processed state;

e) one tenth of the frequency at which the maximum specific total loss is specified, i.e. 5 or 6.

EXAMPLE M250-35A 5 for cold-rolled non-oriented electrical steel strip or sheet with a maximum specific total

loss of 2,50 W/kg at 1,5 T and 50 Hz, a nominal thickness of 0,35 mm, supplied in the fully-processed state.

NOTE The corresponding steel numbers used in the European standard are given in Annex B.

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 is supplied in coils in the case of strip and in bundles in the case of sheets.

---------------------- Page: 9 ----------------------
– 8 – 60404-8-4 © IEC:2013
The mass of coils or bundles of sheets shall be agreed at the time of ordering.
The recommended value for the internal diameter of coils is 508 mm or 610 mm.

Strip shall be of constant width and wound in such a manner that 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 can occasionally exhibit welds or interleaves resulting from the removal of defective

zones, subject to prior agreement between the parties. If necessary, marking of welds or

interleaves may be agreed at the time of ordering.

For coils containing 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.

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

The material may be supplied either without insulation or with insulation on one or both sides. If

the material is supplied with insulation, the nature of the insulation, its properties, and the

stacking factor and their verification shall be agreed at the time of ordering.
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 thickness

tolerances, and if they are not detrimental to the correct use of the supplied material.

When an insulation coating is present on the surface of the material, it shall be sufficiently

adherent so that it does not become detached during cutting operations. During the alternating

bend test (see 8.4.4.2), the coating shall not become detached after a bend of 90°. If the

coating becomes detached during the test, the piece from which the sample was taken shall be

subjected to a shearing test. During this test, it shall not be admissible for large pieces of the

coating to become detached. However, some slight chipping of this coating at the sheared

edges shall be tolerated.
6.5 Suitability for cutting

The material shall be able to be cut or punched without causing premature wear of tools; it

shall be able to be cut at any point and into the usual shapes, thus ensuring accurate working

with the correct cutting tools. If there are special requirements with regard to a suitability test

for cutting or punching, these shall be established by agreement between the manufacturer and

the purchaser.
___________

This should not be confused with some coloration of the insulation coating inherent to the manufacturing

process.
---------------------- Page: 10 ----------------------
60404-8-4 © IEC:2013 – 9 –
7 Technical requirements
7.1 Magnetic properties
7.1.1 General

The properties defined in 7.1.2 to 7.1.4 are applicable to products in the delivery conditions

defined in 6.3. For coated products, the mass of the insulation coating shall be taken into

account.
7.1.2 Magnetic polarization

The minimum specified values of magnetic polarization for magnetic field strengths H of

2 500 A/m, 5 000 A/m and 10 000 A/m (expressed as a peak value) shall be as given in

Table 1.

The magnetic polarization shall be determined in an alternating magnetic field at 50 Hz or

60 Hz.
---------------------- Page: 11 ----------------------
– 10 – 60404-8-4 © IEC:2013

Table 1 – Technological properties and magnetic properties measured by the Epstein method (1 of 2)

Steel Nominal Maximum specific total loss Minimum magnetic polarization Maximum Minimum Minimum Conventional

name thickness at 1,5 T in an alternating magnetic field anisotropy stacking number of density

for a magnetic field strength of loss factor bends
W/kg T
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M210-35A 5 2,10 2,65 1,49 1,60 1,70 ±17 2 7,60
M230-35A 5 2,30 2,90 1,49 1,60 1,70 2 7,60
±17
M235-35A 5 2,35 2,97 1,49 1,60 1,70 2 7,60
±17
M250-35A 5 2,50 3,14 1,49 1,60 1,70 2 7,60
±17
M270-35A 5 0,35 2,70 3,36 1,49 1,60 1,70 0,95 2 7,65
±17
M300-35A 5 3,00 3,74 1,49 1,60 1,70 ±17 3 7,65
M330-35A 5 3,30 4,12 1,49 1,60 1,70 ±17 3 7,65
M360-35A 5 3,60 4,55 1,49 1,60 1,70 ±17 3 7,65
M230-50A 5 2,30 2,95 1,49 1,60 1,70 2 7,60
±17
M250-50A 5 2,50 3,21 1,49 1,60 1,70 2 7,60
±17
M270-50A 5 2,70 3,47 1,49 1,60 1,70 ±17 2 7,60
M290-50A 5 2,90 3,71 1,49 1,60 1,70 ±17 2 7,60
M310-50A 5 3,10 3,95 1,49 1,60 1,70 3 7,65
±14
M330-50A 5 3,30 4,20 1,49 1,60 1,70 3 7,65
±14
M350-50A 5 3,50 4,45 1,50 1,60 1,70 5 7,65
±12
M400-50A 5 0,50 4,00 5,10 1,53 1,63 1,73 0,96 5 7,70
±12
M470-50A 5 4,70 5,90 1,54 1,64 1,74 ±10 10 7,70
M530-50A 5 5,30 6,66 1,56 1,65 1,75 ±10 10 7,70
M600-50A 5 6,00 7,53 1,57 1,66 1,76 10 7,75
±10
M700-50A 5 7,00 8,79 1,60 1,69 1,77 10 7,80
±10
M800-50A 5 8,00 10,06 1,60 1,70 1,78 10 7,80
±10
M940-50A 5 9,40 11,84 1,62 1,72 1,81 10 7,85
M1000-50A 5 10,00 12,60 1,62 1,72 1,81 ±8 10 7,85
---------------------- Page: 12 ----------------------
60404-8-4 © IEC:2013 – 11 –
Table 1 (2 of 2)

Steel Nominal Maximum specific total loss Minimum magnetic polarization Maximum Minimum Minimum Conventional

name thickness at 1,5 T in an alternating magnetic field anisotropy stacking number of density

for a magnetic field strength of loss factor bends
W/kg T
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M310-65A 5 3,10 4,08 1,49 1,60 1,70 ±15 2 7,60
M330-65A 5 3,30 4,30 1,49 1,60 1,70 2 7,60
±15
M350-65A 5 3,50 4,57 1,49 1,60 1,70 2 7,60
±14
M400-65A 5 4,00 5,20 1,52 1,62 1,72 2 7,65
±14
M470-65A 5 0,65 4,70 6,13 1,53 1,63 1,73 0,97 5 7,65
±12
M530-65A 5 5,30 6,84 1,54 1,64 1,74 ±12 5 7,70
M600-65A 5 6,00 7,71 1,56 1,66 1,76 ±10 10 7,75
M700-65A 5 7,00 8,98 1,57 1,67 1,76 10 7,75
±10
M800-65A 5 8,00 10,26 1,60 1,70 1,78 10 7,80
±10
M1000-65A 5 10,00 12,77 1,61 1,71 1,80 10 7,80
±10
M600-100A 5 6,00 8,14 1,53 1,63 1,72 ±10 2 7,60
M700-100A 5 7,00 9,38 1,54 1,64 1,73 ±8 3 7,65
M800-100A 5 1,00 8,00 10,70 1,56 1,66 1,75 0,98 5 7,70
M1000-100A 5 10,00 13,39 1,58 1,68 1,76 10 7,80
M1300-100A 5 13,00 17,34 1,60 1,70 1,78 10 7,80

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 follows:
J = B – µ H
where
J is the magnetic polarization;
B is the magnetic flux density;
–7 –1
µ is the magnetic constant: 4π × 10 H m ;
H is the magnetic field strength;
in accordance with IEC 60050-121.
Only for information.

Other values may be agreed between the manufacturer and the purchaser, see Annex C.

---------------------- Page: 13 ----------------------
– 12 – 60404-8-4 © IEC:2013

Table 2 – Technological properties and magnetic properties measured by the Epstein method

for strip and sheet of nominal thickness 0,47 mm for use at 60 Hz only

Steel Nominal Maximum specific total loss Minimum magnetic polarization Maximum Minimum Minimum Conventional

name thickness at 1,5 T in an alternating magnetic field anisotropy stacking number of density

for a magnetic field strength of loss factor bends
W/kg T
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M370-47A 6 2,92 3,70 1,49 1,60 1,70 2 7,65
±18
M380-47A 6 3,00 3,80 1,49 1,60 1,70 3 7,
...

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