IEC 60404-8-4:2022
(Main)Magnetic materials - Part 8-4: Specifications for individual materials - Cold-rolled non-oriented electrical steel strip and sheet delivered in the fully-processed state
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 60404-8-4:2022 defines the grades of cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses of 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedure. The nominal thickness 0,47 mm applies to the grades for use at 60 Hz only. This document applies to cold-rolled non-oriented electrical steel strip and sheet supplied in the fully-processed state, i.e. the final annealed condition, in coils or sheets, and intended for the construction of magnetic circuits. This document does not apply to materials supplied in the semi-processed state. This edition includes the following significant technical changes with respect to the previous edition:
- modification of terms and technical requirements concerning geometrical characteristics to be consistent with IEC 60404-9:2018;
- insertion of Table 3 - Tolerances on nominal thickness;
- change of the length of test specimen for determination of geometrical characteristics from 2 m to 1 m.
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
L'IEC 60404-8-4:2022 définit les qualités des bandes et tôles magnétiques en acier à grains non orientés, laminées à froid, d'épaisseurs nominales 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm et 1,00 mm. Elle définit notamment les exigences générales, les caractéristiques magnétiques, les caractéristiques géométriques, les tolérances et les caractéristiques technologiques, ainsi que les procédures de contrôle applicables. L'épaisseur nominale 0,47 mm s'applique aux qualités pour utilisation à 60 Hz seulement. Le présent document s'applique aux bandes et tôles magnétiques en acier à grains non orientés, laminées à froid, livrées à l'état fini, c'est-à-dire à l'état de recuit final, en bobines ou en tôles et destinées à la construction de circuits magnétiques. Le présent document ne s'applique pas aux matériaux livrés à l'état semi-fini. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
- modification des termes et des exigences techniques concernant les caractéristiques géométriques dans un souci de cohérence avec l'IEC 60404-9:2018;
- insertion du Tableau 3 - Tolérances sur l'épaisseur nominale;
- modification de la longueur de l'éprouvette pour la détermination des caractéristiques géométriques de 2 m à 1 m.
General Information
Relations
Overview
IEC 60404-8-4:2022 specifies grades and delivery requirements for cold-rolled non-oriented electrical steel strip and sheet supplied in the fully-processed (final annealed) state. The standard covers nominal thicknesses of 0.35 mm, 0.47 mm, 0.50 mm, 0.65 mm and 1.00 mm (the 0.47 mm grade is specified for use at 60 Hz only). It defines general requirements, magnetic properties, geometric characteristics, tolerances, technological characteristics and inspection procedures for materials intended for magnetic circuits. This part applies to coils or sheets in the fully-processed state and does not cover semi-processed materials (see IEC 60404-8-3).
Key topics and technical requirements
- Magnetic properties: Defined grades and measured using standardized methods (Epstein method referenced to IEC 60404-2). Tables provide magnetic polarization, specific total loss and anisotropy of loss where applicable.
- Geometrical characteristics & tolerances: Nominal thickness tolerances (Table 3), width and length tolerances, edge wave (wave factor), residual curvature, edge camber and related measurement methods. Test specimen length for geometric testing revised to 1 m (was 2 m).
- Technological characteristics: Density, stacking factor, number of bends, deviation from shearing line (internal stress) and other manufacturability criteria relevant to assembly and lamination.
- Inspection & testing procedures: Sampling, specimen preparation, test methods, retests, plus marking, labelling, packaging and complaint handling requirements.
- Classification: Grades correspond to Class C.21 of IEC 60404-1.
- Consistency updates: Terminology and geometric requirements aligned with IEC 60404-9:2018.
Practical applications and who uses this standard
IEC 60404-8-4 is essential for:
- Motor and generator designers selecting lamination steel for magnetic circuits.
- Transformer and electrical equipment manufacturers specifying sheet or strip for core construction.
- Material suppliers and steel producers setting product grades and certificates.
- Quality assurance and testing laboratories performing magnetic and geometric tests.
- Procurement and purchasing teams creating compliant specifications and contracts.
Practical value:
- Ensures consistent magnetic performance and mechanical tolerances across suppliers.
- Reduces risk in core assembly (stacking factor, flatness, edge condition).
- Facilitates compliance with international testing methods (Epstein test) and interoperability with related IEC 60404 parts.
Related standards
- IEC 60404-1 (classification)
- IEC 60404-2 (Epstein method for magnetic loss and properties)
- IEC 60404-8-3 (semi-processed cold-rolled non-oriented steel)
- IEC 60404-9:2018 (geometrical characteristics terminology)
Keywords: IEC 60404-8-4, cold-rolled non-oriented electrical steel, non-oriented electrical steel strip and sheet, magnetic materials, fully-processed state, Epstein method, Class C.21, tolerances, annealed.
Standards Content (Sample)
IEC 60404-8-4 ®
Edition 4.0 2022-09
REDLINE VERSION
INTERNATIONAL
STANDARD
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inside
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state
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IEC 60404-8-4 ®
Edition 4.0 2022-09
REDLINE VERSION
INTERNATIONAL
STANDARD
colour
inside
Magnetic materials –
Part 8-4: Specifications for individual materials – Cold-rolled non-oriented
electrical steel strip and sheet delivered in the fully-processed state
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 17.220.20; 29.030 ISBN 978-2-8322-5735-7
– 2 – IEC 60404-8-4:2022 RLV © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 2
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 8
5 Designation . 9
6 General requirements . 10
6.1 Production process . 10
6.2 Form of supply . 10
6.3 Delivery condition . 10
6.4 Surface condition . 10
6.5 Suitability for cutting . 11
7 Technical requirements . 11
7.1 Magnetic properties . 11
7.1.1 General . 11
7.1.2 Magnetic polarization . 11
7.1.3 Specific total loss . 15
7.1.4 Anisotropy of loss . 15
7.2 Geometrical characteristics and tolerances . 15
7.2.1 Thickness . 15
7.2.2 Width . 16
7.2.3 Length . 17
7.2.4 Edge wave (wave factor) . 17
7.2.5 Flatness (wave factor) .
7.2.5 Residual curvature . 18
7.2.6 Edge camber . 18
7.3 Technological characteristics . 18
7.3.1 Density . 18
7.3.2 Stacking factor. 18
7.3.3 Number of bends . 19
7.3.4 Deviation from the shearing line (internal stress) . 19
8 Inspection and testing . 19
8.1 General . 19
8.2 Selection of samples . 19
8.3 Preparation of test specimens . 20
8.3.1 Magnetic properties . 20
8.3.2 Geometrical characteristics and tolerances . 20
8.3.3 Technological characteristics . 21
8.4 Test methods . 21
8.4.1 General . 21
8.4.2 Magnetic properties . 21
8.4.3 Geometrical characteristics and tolerances . 22
8.4.4 Technological characteristics . 22
8.5 Retests . 23
9 Marking, labelling and packaging . 23
10 Complaints . 23
11 Information to be supplied by the purchaser . 23
Annex A (informative) Non-specified magnetic properties . 25
Annex B (informative) European steel numbers .
Annex B (informative) Calculation of density values Calculated density of non-oriented
electrical steel . 27
Bibliography . 28
Table 1 – Technological properties and magnetic properties (magnetic properties are
measured by using the Epstein method according to IEC 60404-2) . 12
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
(magnetic properties are measured using the Epstein method according to
IEC 60404-2) . 14
Table 3 – Tolerances on nominal thickness . 16
Table 4 – Tolerances on nominal width . 17
Table A.1 – Non-specified magnetic properties . 25
– 4 – IEC 60404-8-4:2022 RLV © IEC 2022
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
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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 IEC 60404-8-4:2013. A vertical bar appears in the margin wherever a change
has been made. Additions are in green text, deletions are in strikethrough red text.
IEC 60404-8-4 has been prepared by IEC technical committee 68: Magnetic alloys and steels.
It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) modification of terms and technical requirements concerning geometrical characteristics to
be consistent with IEC 60404-9:2018;
b) insertion of Table 3 – Tolerances on nominal thickness;
c) change of the length of test specimen for determination of geometrical characteristics from
2 m to 1 m.
The text of this International Standard is based on the following documents:
Draft Report on voting
68/700/CDV 68/713/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
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at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all 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
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• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates that it
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contents. Users should therefore print this document using a colour printer.
– 6 – IEC 60404-8-4:2022 RLV © IEC 2022
INTRODUCTION
This revision of International Standard IEC 60404-8-4 has been prepared by the experts of the
Working Group 1 of the IEC Technical Committee 68: Magnetic alloys and steels.
The third edition of IEC 60404-8-4 was issued in 2013. After that, other IEC 60404 standards
were revised and IEC TC 68 decided in 2019 at their meeting in Düsseldorf to revise this
document to maintain consistency for user's convenience. The revision is made mainly on
technical amendments regarding testing and definitions of geometrical characteristics in
accordance with IEC 60404-9. The length of test specimen for determination of geometrical
characteristics is changed from 2 m to 1 m. The term of “flatness” is divided into “edge wave
(wave factor)” and “residual curvature” and the horizontal method is introduced for verification
of residual curvature. This revision also includes corrections in order to improve consistency
with other standards of the IEC 60404-8 series.
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, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm. In
particular, it specifies gives general requirements, magnetic properties, geometric
characteristics, tolerances and technological characteristics, as well as inspection procedure.
The nominal thickness 0,47 mm applies to the grades for use at 60 Hz only.
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.
This document applies to cold-rolled non-oriented electrical steel strip and sheet supplied in the
fully-processed state, i.e. the final annealed condition, in coils or sheets, and intended for the
construction of magnetic circuits. This document does not apply to materials supplied in the
semi-processed state.
NOTE The cold-rolled non-oriented electrical steel strip and sheet supplied in the semi-processed state is specified
in IEC 60404-8-3.
The grades defined in this document correspond to Class C21 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 (all parts), International Electrotechnical Vocabulary (available at
)
IEC 60050-121, International Electrotechnical Vocabulary – Part 121: Electromagnetism
IEC 60050-221, International Electrotechnical Vocabulary – Chapter 221: Magnetic materials
and components
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 strip and sheet and strip by means of an Epstein frame
– 8 – IEC 60404-8-4:2022 RLV © IEC 2022
IEC 60404-3, Magnetic materials – Part 3: Methods of measurement of the magnetic properties
of electrical steel strip and sheet by means of a single sheet tester
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of magnetic electrical steel strip and sheet and strip
IEC 60404-13, Magnetic materials – Part 13: Methods of measurement of density, resistivity,
density and stacking factor of electrical steel strip and 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, 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 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.
[SOURCE: IEC 60404-9:2018, 3.1]
3.2
residual curvature
variations of flatness of a length of strip or a sheet taking a permanent curvature in the direction
of rolling of the product
[SOURCE: IEC 60404-9:2018, 3.2]
3.3
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
[SOURCE: IEC 60404-9:2018, 3.3]
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
3.4
deviation from the shearing line
internal stress
deviation from the shearing line due to internal stresses
greatest distance between corresponding points on the two sheared edges of a length of strip
or a sheet sheared in the middle of the width, in parallel to the direction of rolling of the product,
which characterizes the internal stress of the materials
[SOURCE: IEC 60404-9:2018, 3.4]
3.5
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.
counts of alternate bending in the reverse bend test prior to the appearance of the first crack in
the base metal of the specimen visible to the naked eye or sudden failure occurs by fracture
[SOURCE: IEC TR 63114:2018, 3.2]
4 Classification
The grades covered by this document are classified according to the specified 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 1,00mm) the product .
The products of the nominal thicknesses 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm are
classified according to the specified values tested at a magnetic polarization of 1,5 T and 50
Hz, in watts per kilogram. The product of the nominal thickness 0,47 mm is classified according
to the specified value tested at a magnetic polarization of 1,5 T and 60 Hz, in watts per kilogram.
5 Designation
The steel name comprises the following in the order given:
a) a letter “M” for electrical steel;
b) one hundred times the specified value of maximum specific total loss at a magnetic
polarization of 1,5 T and 50 Hz, 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 for the products of the nominal thicknesses 0,35 mm, 0,50
mm, 0,65 mm and 1,00 mm, or at a magnetic polarization of 1,5 T and 60 Hz, in watts per
kilogram, for the products of the nominal thickness 0,47 mm;
c) one hundred times the nominal thickness of the material product, in millimeters;
d) the characteristic letter “A” for the grades of cold-rolled non-oriented electrical steel 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 M250-35A5 for cold-rolled non-oriented electrical steel strip or sheet with a maximum specific total loss
of 2,50 W/kg at a magnetic polarization of 1,5 T and 50 Hz, and 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.
___________
1 In the rest of the document, the word “product” is used to mean “strip and sheet”.
– 10 – IEC 60404-8-4:2022 RLV © IEC 2022
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 coils or bundles of sheets shall be agreed between the manufacturer and the
purchaser at the time of ordering enquiry and order.
The recommended value for the internal diameter of coils is approximately 508 mm or
approximately 610 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 can occasionally may exhibit welds or interleaves resulting from the removal of defective
zones, subject to prior agreement if agreed between the parties manufacturer and the purchaser
at the time of enquiry and order. If necessary, the marking of welds or interleaves may be
agreed between the manufacturer and the purchaser at the time of ordering enquiry and order.
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 product.
Sheets which make up each bundle shall be stacked so that the side faces of the bundle are
substantially flat and approximately perpendicular to the top face.
6.3 Delivery condition
The material products may be are usually supplied either without insulation coating or with
insulation coating on one or both sides. If the material product is supplied with insulation coating,
the nature of the insulation coating, its properties, the stacking factor and their verification shall
be agreed are subject to agreement between the manufacturer and the purchaser at the time
of ordering enquiry and order.
NOTE Further information on the classification of surface insulation coatings can be found in 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 only permitted if they are within the limits of tolerances
on thickness tolerances, and if they are not detrimental to the correct use of the supplied
material product.
When an insulation coating is present on the surface of the material, it For products supplied
with insulation coating, the coating shall be sufficiently adherent so that it does not become
detached during cutting manufacturing operations. During the alternating reverse bend test (see
8.4.4.2), the coating shall not become detached after a bend of 90°. If the coating becomes
___________
2 This should not be confused with some coloration of the insulation coating inherent to the manufacturing process.
detached during the test, the piece sample of the product from which the sample test specimen
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. By shearing the sample with well sharpened
tools, a detachment of large pieces of the coating shall not be admissible. However, some slight
chipping of the coating at the sheared edges shall be tolerated.
6.5 Suitability for cutting
The material product 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. The product shall be suitable for cutting or punching accurately into the usual
shapes at any point when appropriate cutting or punching tools and technologies are used.
A special requirement concerning suitability for cutting or punching of the product may be
subject to agreement between the manufacturer and the purchaser at the time of enquiry and
order.
7 Technical requirements
7.1 Magnetic properties
7.1.1 General
The properties defined in 7.1.2 to 7.1.4 are applicable shall apply to products in the delivery
conditions defined in 6.3.
For coated products supplied with insulation coating, the mass of the insulation coating shall
be taken into account to determine the magnetic properties.
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.
The specified values of minimum magnetic polarization, expressed as a peak value, at AC
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 at 50 Hz or Table 2 at 60 Hz.
– 12 – IEC 60404-8-4:2022 RLV © IEC 2022
Table 1 – Technological properties and magnetic properties
(magnetic properties are measured by using the Epstein method according to IEC 60404-2)
a
Minimum magnetic polarization
Maximum specific total loss Maximum Minimum Minimum
Steel Nominal Conventional
in an alternating magnetic field
at 1,5 T anisotropy stacking number of
c
name thickness
for at an AC magnetic field strength density
W/kg of loss factor bends
T
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M210-35A5 2,10 2,65 1,49 1,60 1,70 ±17 2 7,60
M230-35A5 2,30 2,90 1,49 1,60 1,70 ±17 2 7,60
M235-35A5 2,35 2,97 1,49 1,60 1,70 ±17 2 7,60
M250-35A5 2,50 3,14 1,49 1,60 1,70 ±17 2 7,60
0,35
M270-35A5 2,70 3,36 1,49 1,60 1,70 ±17 0,95 2 7,65
M300-35A5 3,00 3,74 1,49 1,60 1,70 ±17 3 7,65
M330-35A5 3,30 4,12 1,49 1,60 1,70 ±17 3 7,65
M360-35A5 3,60 4,55 1,49 1,60 1,70 ±17 3 7,65
M230-50A5 2,30 2,95 1,49 1,60 1,70 ±17 2 7,60
M250-50A5 2,50 3,21 1,49 1,60 1,70 ±17 2 7,60
M270-50A5 2,70 3,47 1,49 1,60 1,70 ±17 2 7,60
M290-50A5 2,90 3,71 1,49 1,60 1,70 ±17 2 7,60
M310-50A5 3,10 3,95 1,49 1,60 1,70 ±14 3 7,65
M330-50A5 3,30 4,20 1,49 1,60 1,70 ±14 3 7,65
M350-50A5 3,50 4,45 1,50 1,60 1,70 ±12 5 7,65
M400-50A5 0,50 4,00 5,10 1,53 1,63 1,73 ±12 0,96 5 7,70
M470-50A5 4,70 5,90 1,54 1,64 1,74 ±10 10 7,70
M530-50A5 5,30 6,66 1,56 1,65 1,75 ±10 10 7,70
M600-50A5 6,00 7,53 1,57 1,66 1,76 ±10 10 7,75
M700-50A5 7,00 8,79 1,60 1,69 1,77 ±10 10 7,80
M800-50A5 8,00 10,06 1,60 1,70 1,78 ±10 10 7,80
M940-50A5 9,40 11,84 1,62 1,72 1,81 ±8 10 7,85
M1000-50A5 10,00 12,60 1,62 1,72 1,81 ±8 10 7,85
a
Minimum magnetic polarization
Maximum specific total loss Maximum Minimum Minimum
Conventional
Steel Nominal
in an alternating magnetic field
at 1,5 T anisotropy stacking number of
c
name thickness
for at an AC magnetic field strength density
W/kg of loss factor bends
T
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M310-65A5 3,10 4,08 1,49 1,60 1,70 ±15 2 7,60
M330-65A5 3,30 4,30 1,49 1,60 1,70 ±15 2 7,60
M350-65A5 3,50 4,57 1,49 1,60 1,70 ±14 2 7,60
M400-65A5 4,00 5,20 1,52 1,62 1,72 ±14 2 7,65
M470-65A5 4,70 6,13 1,53 1,63 1,73 ±12 0,97 5 7,65
0,65
M530-65A5 5,30 6,84 1,54 1,64 1,74 ±12 5 7,70
M600-65A5 6,00 7,71 1,56 1,66 1,76 ±10 10 7,75
M700-65A5 7,00 8,98 1,57 1,67 1,76 ±10 10 7,75
M800-65A5 8,00 10,26 1,60 1,70 1,78 ±10 10 7,80
M1000-65A5 10,00 12,77 1,61 1,71 1,80 ±10 10 7,80
M600-100A5 6,00 8,14 1,53 1,63 1,72 ±10 2 7,60
M700-100A5 7,00 9,38 1,54 1,64 1,73 ±8 3 7,65
M800-100A5 1,00 8,00 10,70 1,56 1,66 1,75 ±6 0,98 5 7,70
M1000-100A5 10,00 13,39 1,58 1,68 1,76 ±6 10 7,80
M1300-100A5 13,00 17,34 1,60 1,70 1,78 ±6 10 7,80
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 follows in accordance with IEC 60050-121:
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.
b
Only for information.
c
Other values may be agreed between the manufacturer and the purchaser at the time of enquiry and order, see Annex B.
– 14 – IEC 60404-8-4:2022 RLV © IEC 2022
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
(magnetic properties are measured using the Epstein method according to IEC 60404-2)
a
Steel Nominal Maximum specific total loss Maximum Minimum Minimum Conventional
Minimum magnetic polarization
c
name thickness at 1,5 T anisotropy stacking number of
in an alternating magnetic field density
of loss factor bends
for at an AC magnetic field strength
W/kg
T
b 3
mm at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m %
at 50 Hz kg/dm
M370-47A6 2,92 3,70 1,49 1,60 1,70 ±18 2 7,65
M380-47A6 3,00 3,80 1,49 1,60 1,70 ±14 3 7,65
M408-47A6 3,22 4,08 1,49 1,60 1,70 ±14 3 7,65
M419-47A6 3,31 4,19 1,49 1,60 1,70 ±14 3 7,70
M452-47A6 0,47 3,57 4,52 1,50 1,60 1,70 ±14 0,96 5 7,70
M507-47A6 4,01 5,07 1,51 1,61 1,71 ±14 5 7,70
M638-47A6 5,04 6,38 1,54 1,64 1,74 ±12 10 7,75
M836-47A6 6,60 8,36 1,58 1,68 1,77 ±12 10 7,80
M990-47A6 7,82 9,90 1,58 1,68 1,77 ±12 10 7,80
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 follows in accordance with IEC 60050-121:
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.
b
Only for information.
c
Other values may be agreed between the manufacturer and the purchaser at the time of enquiry and order, see Annex B.
7.1.3 Specific total loss
The specified values of maximum specific total loss at 50 Hz shall be as given in Table 1. They
apply:
– for the nominal thicknesses 0,35 mm, 0,50 mm and 0,65 mm to aged or non-aged test
pieces (see 8.3.1);
– for the nominal thickness 1,00 mm to non-aged test pieces.
Table 2 gives the specified values of maximum specific total loss at 60 Hz for products of
0,47 mm nominal thickness.
In certain cases, the specified value of maximum specific total loss can be made the subject of
agreement for longitudinal test pieces only or for transverse test pieces only.
The values of the specific total loss are specified for a magnetic polarization of 1,5 T.
The test shall be made in an alternating magnetic field at 50 Hz or at 60 Hz.
The specified values of maximum specific total loss at a magnetic polarization of 1,5 T and
50 Hz shall be as given in Table 1 for products of the nominal thicknesses 0,35 mm, 0,50 mm,
0,65 mm and 1,00 mm. They apply to:
– aged or non-aged test strips (see 8.3.1), for products of the nominal thicknesses 0,35 mm,
0,50 mm and 0,65 mm;
– non-aged test strips, for products of the nominal thickness 1,00 mm.
The specified values of maximum specific total loss at a magnetic polarization of 1,5 T and
60 Hz shall be as given in Table 2, for products of the nominal thickness 0,47 mm.
A special requirement concerning the value of maximum specific total loss measured using test
strips cut parallel to the direction of rolling only or test strips cut perpendicular to the direction
of rolling only may be subject to agreement between the manufacturer and the purchaser at the
time of enquiry and order.
NOTE Annex A gives non-specified values of maximum specific total loss at a magnetic polarization of 1,0 T and
50 Hz.
7.1.4 Anisotropy of loss
The maximum permitted values of maximum anisotropy of loss at a magnetic polarization of 1,5
T shall be as specified given in Table 1 and Table 2.
A special requirement concerning the declaration of the measured value of anisotropy of loss
may be specified by subject to agreement when ordering between the manufacturer and the
purchaser at the time of enquiry and order.
7.2 Geometrical characteristics and tolerances
7.2.1 Thickness
The nominal thicknesses of the material product are 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and
1,00 mm.
The nominal thickness 0,47 mm applies only to the grades for use at 60 Hz only is also given
in Table 2.
For thickness tolerance, a distinction is made between
– 16 – IEC 60404-8-4:2022 RLV © IEC 2022
– the allowable tolerance on the nominal thickness within the same acceptance unit;
– the deviation from the nominal thickness within an acceptance unit;
– the difference in thickness in a sheet or in a length of strip in a direction parallel to the
direction of rolling in a length of strip or sheet;
– the difference in thickness in a direction perpendicular to the direction of rolling. This
tolerance applies only to materials products supplied with a width greater than 150 mm.
The allowable tolerance on the nominal thickness within the same acceptance unit shall be ± 8 %
of the nominal value for the nominal thicknesses 0,35 mm, 0,47 mm and 0,50 mm, and ± 6 %
of the nominal value for the nominal thicknesses 0,65 mm and 1,00 mm. The additional
thickness due to welds, with respect to the measured thickness of the steel strip or sheet, shall
not exceed 0,10 mm.
The difference in thickness in a sheet or in a length of strip (see 8.3.2) in a direction parallel to
the direction of rolling shall not exceed 8 % for nominal thicknesses 0,35 mm, 0,47 mm and
0,50 mm, and 6 % for nominal thicknesses 0,65 mm and 1,00 mm.
The difference in thickness in a direction perpendicular to the direction of rolling shall not
exceed 0,020 mm for nominal thicknesses of 0,35 mm, 0,47 mm and 0,50 mm, and 0,030 mm
for the nominal thicknesses of 0,65 mm and 1,00 mm, the measurements being made at least
30 mm from the edges (see 8.4.3.1). These tolerances apply only to materials with a width
greater than 150 mm. For narrow strips, other agreements may be reached.
At any point, the deviation from the nominal thickness within an acceptance unit shall not
exceed the tolerance of Table 3.
The additional thickness due to welds with respect to the measured thickness of the product
shall not exceed 0,10 mm.
The difference in thickness in a direction parallel to the direction of rolling in a 1 m length of the
product shall not exceed
– 0,030 mm, 0,038 mm and 0,040 mm for products of the nominal thicknesses 0,35 mm,
0,47 mm and 0,50 mm respectively;
– 0,045 mm and 0,060 mm for products of the nominal thicknesses 0,65 mm and 1,00 mm
respectively.
Table 3 – Tolerances on nominal thickness
Nominal thickness Tolerance
mm mm
0,35 ±0,030
0,47 ±0,038
0,50 ±0,040
0,65 ±0,045
1,00 ±0,060
For products supplied 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 for products of the nominal thicknesses 0,35 mm, 0,47 mm and 0,50 mm;
– 0,030 mm for products of the nominal thicknesses 0,65 mm and 1,00 mm.
The measurements shall be made at any point located at least 20 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 1 250 mm.
For the tolerances on width, a distinction is made between material products supplied with slit
edges in the as-rolled condition and material delivered with trimmed edges and products
supplied with as-rolled edges.
For materials products supplied with trimmed slit edges, the tolerances of Table 4 shall apply.
Table 4 – Tolerances on nominal width
a
Tolerance
Nominal width l
mm mm
+02,
l ≤ 150
+03,
150 < l ≤ 300
+0,5
300 < l ≤ 600
+1,0
600 < l ≤ 1 000
+1,5
b
1 000 < l ≤ 1 250
a
By agreement when ordering between the manufacturer and the purchaser at the
time of enquiry and order, the tolerances on nominal width can be all minus values
tolerances.
b
Nominal widths greater than 1 250 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.
For materials products supplied with as-rolled edges, the tolerances on nominal width should
geometric characteristics shall be subject to agreement when ordering between the
manufacturer and the purchaser at the time of enquiry and order.
7.2.3 Length
The verification of length does not apply to the products supplied in coils.
For products supplied in sheets, the tolerance on the length of sheets in relation to the length
+0,5
ordered shall be %, but with a maximum of +6 mm.
7.2.4 Edge wave (wave factor)
The verification of edge wave applies only to products supplied with a width greater than
100 mm. The wave factor (see 8.4.3.3), shall not exceed 2 %.
7.2.5 Flatness (wave factor)
The verification of flatness does not apply to material of width less than or equal to 100 mm.
The wave factor (see 8.4.3.4), expressed as a percentage, shall not exceed 2.
– 18 – IEC 60404-8-4:2022 RLV © IEC 2022
7.2.5 Residual curvature
The verification of residual curvature does not apply to material of width less than or equal to
applies only to products supplied with a width greater than 100 mm.
A requirement concerning residual curvature can be specified by agreement when ordering; in
this case, the distance between the bottom edge of the test specimen and the supporting plate
shall not exceed 35 mm for the products of nominal thicknesses 0,35 mm, 0,47 mm, 0,50 mm
and 0,65 mm. For the nominal thickness 1,00 mm, this distance shall be subject to an
agreement between the manufacturer and the purchaser.
A requirement concerning residual curvature may be subject to agreement between the
manufacturer and the purchaser at the time of enquiry and order.
Two methods for the determination of the residual curvature in the direction of rolling of the
product are described in IEC 60404-9: a horizontal method and a vertical method. The
horizontal method is recommended from the aspect of worker’s safety and consistency with
ISO standards.
• Horizontal method:
In this method, the maximum dis
...
IEC 60404-8-4 ®
Edition 4.0 2022-09
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
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IEC 60404-8-4 ®
Edition 4.0 2022-09
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
INTERNATIONALE
ICS 17.220.20; 29.030 ISBN 978-2-8322-5708-1
– 2 – IEC 60404-8-4:2022 © IEC 2022
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification . 9
5 Designation . 9
6 General requirements . 9
6.1 Production process . 9
6.2 Form of supply . 9
6.3 Delivery condition . 10
6.4 Surface condition . 10
6.5 Suitability for cutting . 10
7 Technical requirements . 10
7.1 Magnetic properties . 10
7.1.1 General . 10
7.1.2 Magnetic polarization . 11
7.1.3 Specific total loss . 15
7.1.4 Anisotropy of loss . 15
7.2 Geometrical characteristics and tolerances . 15
7.2.1 Thickness . 15
7.2.2 Width . 16
7.2.3 Length . 17
7.2.4 Edge wave (wave factor) . 17
7.2.5 Residual curvature . 17
7.2.6 Edge camber . 17
7.3 Technological characteristics . 17
7.3.1 Density . 17
7.3.2 Stacking factor. 18
7.3.3 Number of bends . 18
7.3.4 Deviation from the shearing line (internal stress) . 18
8 Inspection and testing . 18
8.1 General . 18
8.2 Selection of samples . 18
8.3 Preparation of test specimens . 19
8.3.1 Magnetic properties . 19
8.3.2 Geometrical characteristics and tolerances . 19
8.3.3 Technological characteristics . 19
8.4 Test methods . 20
8.4.1 General . 20
8.4.2 Magnetic properties . 20
8.4.3 Geometrical characteristics and tolerances . 21
8.4.4 Technological characteristics . 21
8.5 Retests . 22
9 Marking, labelling and packaging . 22
10 Complaints . 22
11 Information to be supplied by the purchaser . 22
Annex A (informative) Non-specified magnetic properties . 24
Annex B (informative) Calculated density of non-oriented electrical steel . 25
Bibliography . 26
Table 1 – Technological properties and magnetic properties (magnetic properties are
measured using the Epstein method according to IEC 60404-2) . 12
Table 2 – Technological properties and magnetic properties for strip and sheet of
nominal thickness 0,47 mm for use at 60 Hz only (magnetic properties are measured
using the Epstein method according to IEC 60404-2) . 14
Table 3 – Tolerances on nominal thickness . 16
Table 4 – Tolerances on nominal width . 16
Table A.1 – Non-specified magnetic properties . 24
– 4 – IEC 60404-8-4:2022 © IEC 2022
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
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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.
IEC 60404-8-4 has been prepared by IEC technical committee 68: Magnetic alloys and steels.
It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2013. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) modification of terms and technical requirements concerning geometrical characteristics to
be consistent with IEC 60404-9:2018;
b) insertion of Table 3 – Tolerances on nominal thickness;
c) change of the length of test specimen for determination of geometrical characteristics from
2 m to 1 m.
The text of this International Standard is based on the following documents:
Draft Report on voting
68/700/CDV 68/713/RVC
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
A list of all 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 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.
– 6 – IEC 60404-8-4:2022 © IEC 2022
INTRODUCTION
This revision of International Standard IEC 60404-8-4 has been prepared by the experts of the
Working Group 1 of the IEC Technical Committee 68: Magnetic alloys and steels.
The third edition of IEC 60404-8-4 was issued in 2013. After that, other IEC 60404 standards
were revised and IEC TC 68 decided in 2019 at their meeting in Düsseldorf to revise this
document to maintain consistency for user's convenience. The revision is made mainly on
technical amendments regarding testing and definitions of geometrical characteristics in
accordance with IEC 60404-9. The length of test specimen for determination of geometrical
characteristics is changed from 2 m to 1 m. The term of “flatness” is divided into “edge wave
(wave factor)” and “residual curvature” and the horizontal method is introduced for verification
of residual curvature. This revision also includes corrections in order to improve consistency
with other standards of the IEC 60404-8 series.
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, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm. In
particular, it gives general requirements, magnetic properties, geometric characteristics,
tolerances and technological characteristics, as well as inspection procedure. The nominal
thickness 0,47 mm applies to the grades for use at 60 Hz only.
This document applies to cold-rolled non-oriented electrical steel strip and sheet supplied in the
fully-processed state, i.e. the final annealed condition, in coils or sheets, and intended for the
construction of magnetic circuits. This document does not apply to materials supplied in the
semi-processed state.
NOTE The cold-rolled non-oriented electrical steel strip and sheet supplied in the semi-processed state is specified
in IEC 60404-8-3.
The grades defined in this document correspond to Class C21 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
IEC 60050-221, International Electrotechnical Vocabulary – Chapter 221: Magnetic materials
and components
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 strip and sheet by means of an Epstein frame
IEC 60404-3, Magnetic materials – Part 3: Methods of measurement of the magnetic properties
of electrical steel strip and sheet by means of a single sheet tester
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of electrical steel strip and sheet
IEC 60404-13, Magnetic materials – Part 13: Methods of measurement of resistivity, density
and stacking factor of electrical steel strip and sheet
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
– 8 – IEC 60404-8-4:2022 © IEC 2022
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,
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 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.
[SOURCE: IEC 60404-9:2018, 3.1]
3.2
residual curvature
variations of flatness of a length of strip or a sheet taking a permanent curvature in the direction
of rolling of the product
[SOURCE: IEC 60404-9:2018, 3.2]
3.3
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
[SOURCE: IEC 60404-9:2018, 3.3]
3.4
deviation from the shearing line
internal stress
greatest distance between corresponding points on the two sheared edges of a length of strip
or a sheet sheared in the middle of the width, in parallel to the direction of rolling of the product,
which characterizes the internal stress of the materials
[SOURCE: IEC 60404-9:2018, 3.4]
3.5
number of bends
counts of alternate bending in the reverse bend test prior to the appearance of the first crack in
the base metal of the specimen visible to the naked eye or sudden failure occurs by fracture
[SOURCE: IEC TR 63114:2018, 3.2]
4 Classification
The grades covered by this document are classified according to the specified value of
maximum specific total loss and according to the nominal thickness of the product .The
products of the nominal thicknesses 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm are classified
according to the specified values tested at a magnetic polarization of 1,5 T and 50 Hz, in watts
per kilogram. The product of the nominal thickness 0,47 mm is classified according to the
specified value tested at a magnetic polarization of 1,5 T and 60 Hz, in watts per kilogram.
5 Designation
The steel name comprises the following in the order given:
a) a letter “M” for electrical steel;
b) one hundred times the specified value of maximum specific total loss at a magnetic
polarization of 1,5 T and 50 Hz, in watts per kilogram, for the products of the nominal
thicknesses 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm, or at a magnetic polarization of
1,5 T and 60 Hz, in watts per kilogram, for the products of the nominal thickness 0,47 mm;
c) one hundred times the nominal thickness of the product, in millimeters;
d) the characteristic letter “A” for the grades of cold-rolled non-oriented electrical steel 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 M250-35A5 for cold-rolled non-oriented electrical steel strip or sheet with a maximum specific total loss
of 2,50 W/kg at a magnetic polarization of 1,5 T and 50 Hz, and a nominal thickness of 0,35 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 coils or bundles of sheets shall be agreed between the manufacturer and the
purchaser at the time of enquiry and order.
The recommended value for the internal diameter of coils is approximately 508 mm or
approximately 610 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 the purchaser at the time of enquiry and order. If necessary, the
marking of welds or interleaves may be agreed between the manufacturer and the purchaser at
the time of enquiry and order.
___________
1 In the rest of the document, the word “product” is used to mean “strip and sheet”.
– 10 – IEC 60404-8-4:2022 © IEC 2022
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 product.
Sheets which make up each bundle shall be stacked so that the side faces of the bundle are
substantially flat and approximately perpendicular to the top face.
6.3 Delivery condition
The products are usually supplied either without insulation coating or with insulation coating on
one or both sides. If the product is supplied with insulation coating, the nature of the coating,
its properties, the stacking factor and their verification are subject to agreement between the
manufacturer and the purchaser at the time of enquiry and order.
NOTE Further information on the classification of surface insulation coatings can be found in 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 only permitted if they are within the tolerances on
thickness and if they are not detrimental to the correct use of the supplied product.
For products supplied with insulation coating, the coating shall be sufficiently adherent so that
it does not become detached during manufacturing operations. During the reverse 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 sample of the product from which the test specimen was taken
shall be subjected to a shearing test. By shearing the sample with well sharpened tools, a
detachment of large pieces of the coating shall not be admissible. However, some slight
chipping of the coating at the sheared edges shall be tolerated.
6.5 Suitability for cutting
The product shall be able to be cut or punched without causing premature wear of tools. The
product shall be suitable for cutting or punching accurately into the usual shapes at any point
when appropriate cutting or punching tools and technologies are used.
A special requirement concerning suitability for cutting or punching of the product may be
subject to agreement between the manufacturer and the purchaser at the time of enquiry and
order.
7 Technical requirements
7.1 Magnetic properties
7.1.1 General
The properties defined in 7.1.2 to 7.1.4 shall apply to products in the delivery conditions defined
in 6.3.
For products supplied with insulation coating, the mass of the coating shall be taken into
account to determine the magnetic properties.
___________
2 This should not be confused with some coloration of the insulation coating inherent to the manufacturing process.
7.1.2 Magnetic polarization
The specified values of minimum magnetic polarization, expressed as a peak value, at AC
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 at 50 Hz or Table 2 at 60 Hz.
– 12 – IEC 60404-8-4:2022 © IEC 2022
Table 1 – Technological properties and magnetic properties
(magnetic properties are measured using the Epstein method according to IEC 60404-2)
a
Maximum specific total loss Maximum Minimum Minimum
Minimum magnetic polarization
Conventional
Steel Nominal
at 1,5 T anisotropy stacking number of
at an AC magnetic field strength
c
name thickness
density
W/kg T of loss factor bends
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M210-35A5 2,10 2,65 1,49 1,60 1,70 ±17 2 7,60
M230-35A5 2,30 2,90 1,49 1,60 1,70 ±17 2 7,60
M235-35A5 2,35 2,97 1,49 1,60 1,70 ±17 2 7,60
M250-35A5 2,50 3,14 1,49 1,60 1,70 ±17 2 7,60
0,35
M270-35A5 2,70 3,36 1,49 1,60 1,70 ±17 0,95 2 7,65
M300-35A5 3,00 3,74 1,49 1,60 1,70 ±17 3 7,65
M330-35A5 3,30 4,12 1,49 1,60 1,70 ±17 3 7,65
M360-35A5 3,60 4,55 1,49 1,60 1,70 ±17 3 7,65
M230-50A5 2,30 2,95 1,49 1,60 1,70 ±17 2 7,60
M250-50A5 2,50 3,21 1,49 1,60 1,70 ±17 2 7,60
M270-50A5 2,70 3,47 1,49 1,60 1,70 ±17 2 7,60
M290-50A5 2,90 3,71 1,49 1,60 1,70 ±17 2 7,60
M310-50A5 3,10 3,95 1,49 1,60 1,70 ±14 3 7,65
M330-50A5 3,30 4,20 1,49 1,60 1,70 ±14 3 7,65
M350-50A5 3,50 4,45 1,50 1,60 1,70 ±12 5 7,65
M400-50A5 0,50 4,00 5,10 1,53 1,63 1,73 ±12 0,96 5 7,70
M470-50A5 4,70 5,90 1,54 1,64 1,74 ±10 10 7,70
M530-50A5 5,30 6,66 1,56 1,65 1,75 ±10 10 7,70
M600-50A5 6,00 7,53 1,57 1,66 1,76 ±10 10 7,75
M700-50A5 7,00 8,79 1,60 1,69 1,77 ±10 10 7,80
M800-50A5 8,00 10,06 1,60 1,70 1,78 ±10 10 7,80
M940-50A5 9,40 11,84 1,62 1,72 1,81 ±8 10 7,85
M1000-50A5 10,00 12,60 1,62 1,72 1,81 ±8 10 7,85
a
Maximum specific total loss Maximum Minimum Minimum
Minimum magnetic polarization
Conventional
Steel Nominal
at 1,5 T anisotropy stacking number of
at an AC magnetic field strength
c
name thickness
density
W/kg T of loss factor bends
b 3
mm at 50 Hz at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m % kg/dm
M310-65A5 3,10 4,08 1,49 1,60 1,70 ±15 2 7,60
M330-65A5 3,30 4,30 1,49 1,60 1,70 ±15 2 7,60
M350-65A5 3,50 4,57 1,49 1,60 1,70 ±14 2 7,60
M400-65A5 4,00 5,20 1,52 1,62 1,72 ±14 2 7,65
M470-65A5 4,70 6,13 1,53 1,63 1,73 ±12 0,97 5 7,65
0,65
M530-65A5 5,30 6,84 1,54 1,64 1,74 ±12 5 7,70
M600-65A5 6,00 7,71 1,56 1,66 1,76 ±10 10 7,75
M700-65A5 7,00 8,98 1,57 1,67 1,76 ±10 10 7,75
M800-65A5 8,00 10,26 1,60 1,70 1,78 ±10 10 7,80
M1000-65A5 10,00 12,77 1,61 1,71 1,80 ±10 10 7,80
M600-100A5 6,00 8,14 1,53 1,63 1,72 ±10 2 7,60
M700-100A5 7,00 9,38 1,54 1,64 1,73 ±8 3 7,65
M800-100A5 1,00 8,00 10,70 1,56 1,66 1,75 ±6 0,98 5 7,70
M1000-100A5 10,00 13,39 1,58 1,68 1,76 ±6 10 7,80
M1300-100A5 13,00 17,34 1,60 1,70 1,78 ±6 10 7,80
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 follows in accordance with IEC 60050-121:
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.
b
Only for information.
c
Other values may be agreed between the manufacturer and the purchaser at the time of enquiry and order, see Annex B.
– 14 – IEC 60404-8-4:2022 © IEC 2022
Table 2 – Technological properties and magnetic properties for strip and sheet of nominal thickness 0,47 mm for use at 60 Hz only
(magnetic properties are measured using the Epstein method according to IEC 60404-2)
a
Steel Nominal Maximum specific total loss Maximum Minimum Minimum Conventional
Minimum magnetic polarization
c
name thickness at 1,5 T anisotropy stacking number of
at an AC magnetic field strength density
of loss factor bends
W/kg
T
b 3
mm at 60 Hz 2 500 A/m 5 000 A/m 10 000 A/m %
at 50 Hz kg/dm
M370-47A6 2,92 3,70 1,49 1,60 1,70 ±18 2 7,65
M380-47A6 3,00 3,80 1,49 1,60 1,70 ±14 3 7,65
M408-47A6 3,22 4,08 1,49 1,60 1,70 ±14 3 7,65
M419-47A6 3,31 4,19 1,49 1,60 1,70 ±14 3 7,70
M452-47A6 0,47 3,57 4,52 1,50 1,60 1,70 ±14 0,96 5 7,70
M507-47A6 4,01 5,07 1,51 1,61 1,71 ±14 5 7,70
M638-47A6 5,04 6,38 1,54 1,64 1,74 ±12 10 7,75
M836-47A6 6,60 8,36 1,58 1,68 1,77 ±12 10 7,80
M990-47A6 7,82 9,90 1,58 1,68 1,77 ±12 10 7,80
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 follows in accordance with IEC 60050-121:
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.
b
Only for information.
c
Other values may be agreed between the manufacturer and the purchaser at the time of enquiry and order, see Annex B.
7.1.3 Specific total loss
The specified values of maximum specific total loss at a magnetic polarization of 1,5 T and
50 Hz shall be as given in Table 1 for products of the nominal thicknesses 0,35 mm, 0,50 mm,
0,65 mm and 1,00 mm. They apply to:
– aged or non-aged test strips (see 8.3.1), for products of the nominal thicknesses 0,35 mm,
0,50 mm and 0,65 mm;
– non-aged test strips, for products of the nominal thickness 1,00 mm.
The specified values of maximum specific total loss at a magnetic polarization of 1,5 T and
60 Hz shall be as given in Table 2, for products of the nominal thickness 0,47 mm.
A special requirement concerning the value of maximum specific total loss measured using test
strips cut parallel to the direction of rolling only or test strips cut perpendicular to the direction
of rolling only may be subject to agreement between the manufacturer and the purchaser at the
time of enquiry and order.
NOTE Annex A gives non-specified values of maximum specific total loss at a magnetic polarization of 1,0 T and
50 Hz.
7.1.4 Anisotropy of loss
The permitted values of maximum anisotropy of loss at a magnetic polarization of 1,5 T shall
be as given in Table 1 and Table 2.
A special requirement concerning the declaration of the measured value of anisotropy of loss
may be subject to agreement between the manufacturer and the purchaser at the time of enquiry
and order.
7.2 Geometrical characteristics and tolerances
7.2.1 Thickness
The nominal thicknesses of the product are 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm.
The nominal thickness 0,47 mm applies only to the grades for use at 60 Hz only.
For thickness tolerance, a distinction is made between
– the deviation from the nominal thickness within an acceptance unit;
– the difference in thickness in a direction parallel to the direction of rolling in a length of strip
or sheet;
– the difference in thickness in a direction perpendicular to the direction of rolling. This
tolerance applies only to products supplied with a width greater than 150 mm.
At any point, the deviation from the nominal thickness within an acceptance unit shall not
exceed the tolerance of Table 3.
The additional thickness due to welds with respect to the measured thickness of the product
shall not exceed 0,10 mm.
The difference in thickness in a direction parallel to the direction of rolling in a 1 m length of the
product shall not exceed
– 0,030 mm, 0,038 mm and 0,040 mm for products of the nominal thicknesses 0,35 mm,
0,47 mm and 0,50 mm respectively;
– 0,045 mm and 0,060 mm for products of the nominal thicknesses 0,65 mm and 1,00 mm
respectively.
– 16 – IEC 60404-8-4:2022 © IEC 2022
Table 3 – Tolerances on nominal thickness
Nominal thickness Tolerance
mm mm
0,35 ±0,030
0,47 ±0,038
0,50 ±0,040
0,65 ±0,045
1,00 ±0,060
For products supplied 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 for products of the nominal thicknesses 0,35 mm, 0,47 mm and 0,50 mm;
– 0,030 mm for products of the nominal thicknesses 0,65 mm and 1,00 mm.
The measurements shall be made at any point located at least 20 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 1 250 mm.
For the tolerances on width, a distinction is made between products supplied with slit edges
and products supplied with as-rolled edges.
For products supplied with slit edges, the tolerances of Table 4 shall apply.
Table 4 – Tolerances on nominal width
a
Tolerance
Nominal width l
mm mm
+02,
l ≤ 150
+03,
150 < l ≤ 300
+0,5
300 < l ≤ 600
+1,0
600 < l ≤ 1 000
+1,5
b
1 000 < l ≤ 1 250
a
By agreement between the manufacturer and the purchaser at the time of enquiry
and order, the tolerances on nominal width can be all minus tolerances.
b
Nominal widths greater than 1 250 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.
For products supplied with as-rolled edges, the tolerances on geometric characteristics shall
be subject to agreement between the manufacturer and the purchaser at the time of enquiry
and order.
7.2.3 Length
The verification of length does not apply to the products supplied in coils.
For products supplied in sheets, the tolerance on the length of sheets in relation to the length
+0,5
ordered shall be %, but with a maximum of +6 mm.
7.2.4 Edge wave (wave factor)
The verification of edge wave applies only to products supplied with a width greater than
100 mm. The wave factor (see 8.4.3.3), shall not exceed 2 %.
7.2.5 Residual curvature
The verification of residual curvature applies only to products supplied with a width greater than
100 mm.
A requirement concerning residual curvature may be subject to agreement between the
manufacturer and the purchaser at the time of enquiry and order.
Two methods for the determination of the residual curvature in the direction of rolling of the
product are described in IEC 60404-9: a horizontal method and a vertical method. The
horizontal method is recommended from the aspect of worker’s safety and consistency with
ISO standards.
• Horizontal method:
In this method, the maximum distance between the test specimen and a flat surface table,
on which the test specimen is placed, shall not exceed 17,5 mm for products of the nominal
thicknesses 0,35 mm, 0,47 mm, 0,50 mm and 0,65 mm. A different maximum distance may
be agreed by the manufacturer and the purchaser at the time of enquiry and order. For
products of the nominal thickness 1,00 mm, this distance shall be subject to agreement
between the manufacturer and the purchaser at the time of enquiry and order.
• Vertical method:
In this method, the maximum distance between the bottom edge of the test specimen and
the supporting plate shall not exceed 35 mm for products of the nominal thicknesses
0,35 mm, 0,47 mm, 0,50 mm and 0,65 mm. For products of the nominal thickness 1,00 mm,
this distance shall be subject to agreement between the manufacturer and the purchaser at
the time of enquiry and order.
NOTE The horizontal and vertical methods, with the limits 17,5 mm and 35 mm respectively, are not exactly
interchangeable. Which method to use can be subject to agreement between the manufacturer and the purchaser at
the time of enquiry and order.
7.2.6 Edge camber
The verification of edge camber applies only to products supplied with slit edges and a width
greater than 30 mm.
The edge camber shall not exceed for a measuring length of 1 m:
– 1,0 mm for the nominal width l, l > 150 mm;
– 2,0 mm for the nominal width l, 30 mm < l ≤ 150 mm.
7.3 Technological characteristics
7.3.1 Density
The density of the products is not specified.
– 18 – IEC 60404-8-4:2022 © IEC 2022
The conventional values of density used to calculate the magnetic properties and the stacking
factor shall be as given in Table 1 and Table 2. Other values may be agreed between the
manufacturer and the purchaser at the time of enquiry and order (see Annex B).
7.3.2 Stacking factor
The specified values of minimum stacking factor shall be as given in Table 1 and Table 2, and
only apply to products supplied without insulation coating. The values of products supplied with
insulation coating are subject to agreement between the manufacture and the purchaser at the
time of enquiry and order.
7.3.3 Number of bends
The specified minimum number of bends shall be as given in Table 1 and Table 2. The values
apply to test specimens cut perpendicular to the direction of rolling.
7.3.4 Deviation from the shearing line (internal stress)
The products shall be, as far as possible, free from internal stress.
The verification of the deviation from the shearing line applies only to products supplied with a
width greater than 150 mm. The measured gap shall not exceed 1 mm for a measuring length
of 1 m.
8 Inspection and testing
8.1 General
The 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 an inspection document type 3.1 according to
ISO 10474 giving the specific total loss of the supplied 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 20 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.
...
Frequently Asked Questions
IEC 60404-8-4:2022 is a standard published by the International Electrotechnical Commission (IEC). Its full title is "Magnetic materials - Part 8-4: Specifications for individual materials - Cold-rolled non-oriented electrical steel strip and sheet delivered in the fully-processed state". This standard covers: IEC 60404-8-4:2022 defines the grades of cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses of 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedure. The nominal thickness 0,47 mm applies to the grades for use at 60 Hz only. This document applies to cold-rolled non-oriented electrical steel strip and sheet supplied in the fully-processed state, i.e. the final annealed condition, in coils or sheets, and intended for the construction of magnetic circuits. This document does not apply to materials supplied in the semi-processed state. This edition includes the following significant technical changes with respect to the previous edition: - modification of terms and technical requirements concerning geometrical characteristics to be consistent with IEC 60404-9:2018; - insertion of Table 3 - Tolerances on nominal thickness; - change of the length of test specimen for determination of geometrical characteristics from 2 m to 1 m.
IEC 60404-8-4:2022 defines the grades of cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses of 0,35 mm, 0,47 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedure. The nominal thickness 0,47 mm applies to the grades for use at 60 Hz only. This document applies to cold-rolled non-oriented electrical steel strip and sheet supplied in the fully-processed state, i.e. the final annealed condition, in coils or sheets, and intended for the construction of magnetic circuits. This document does not apply to materials supplied in the semi-processed state. This edition includes the following significant technical changes with respect to the previous edition: - modification of terms and technical requirements concerning geometrical characteristics to be consistent with IEC 60404-9:2018; - insertion of Table 3 - Tolerances on nominal thickness; - change of the length of test specimen for determination of geometrical characteristics from 2 m to 1 m.
IEC 60404-8-4:2022 is classified under the following ICS (International Classification for Standards) categories: 17.220.20 - Measurement of electrical and magnetic quantities; 29.030 - Magnetic materials. The ICS classification helps identify the subject area and facilitates finding related standards.
IEC 60404-8-4:2022 has the following relationships with other standards: It is inter standard links to IEC 60404-8-4:2013. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
You can purchase IEC 60404-8-4:2022 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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