SIST EN 60404-8-6:2017

Magnetic materials - Part 8-6: Specifications for individual materials - Soft magnetic metallic materials (IEC 60404-8-6:2016)

This part of IEC 60404 specifies the general requirements, magnetic properties, geometric
characteristics and tolerances as well as inspection procedures for pure iron, silicon-iron,
nickel-iron and cobalt-iron. The materials are in the form of bar, billet, sheet, strip or wire. The
alloys covered correspond to those defined by classes A, C1, C2, E1 to E4 and F1 to F3 in
IEC 60404-1.
Magnetic materials used primarily for relays, iron and steel products, classified only by
coercivity, are covered in IEC 60404-8-10. IEC 60404-8-10 is less restrictive in terms of
magnetic properties than the irons (class A) and the silicon steels (classes C21 and C22)
specified in this standard, but it gives more comprehensive dimensional tolerances.
Non-oriented and oriented silicon steels (C21 and C22) for industrial power frequency
applications, classified by specific total loss, are covered in IEC 60404-8-3, IEC 60404-8-4
and IEC 60404-8-7.
Non-oriented and oriented thin magnetic materials for use at medium frequencies, classified
by specific total loss, are covered in IEC 60404-8-8.

Magnetische Werkstoffe - Teil 8-6: Anforderungen an einzelne Werkstoffe - Weichmagnetische metallische Werkstoffe (IEC 60404-8-6:2016)

Matériaux magnétiques - Partie 8-6: Spécifications pour matériaux particuliers - Matériaux métalliques magnétiquement doux (IEC 60404-8-6:2016)

L’IEC 60404-8-6 :2016 spécifie les exigences générales, les propriétés magnétiques, les caractéristiques géométriques et leurs tolérances, ainsi que les modes de contrôle pour le fer pur, le fer-silicium, le fer-nickel et le fer-cobalt. Les matériaux se présentent sous forme de barres, billettes, tôles, bandes ou fils. Les alliages concernés correspondent à ceux définis par les classes A, C1, C2, E1 à E4 et F1 à F3 de l’IEC 60404-1. Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: Suppression du Tableau 2b).

Magnetni materiali - 8-6. del: Specifikacije za posamezne materiale - Mehkomagnetni kovinski material (IEC 60404-8-6:2016)

Ta del standarda IEC 60404 določa splošne zahteve, magnetne lastnosti, geometrijske lastnosti in tolerance ter postopke pregledovanja za čisto železo, železo na osnovi silikona, železo na osnovi niklja in železo na osnovi kobalta. Materiali so v obliki drogov, palic, pločevin, trakov ali žice. Obravnavane zlitine ustrezajo tistim, ki so opredeljene z razredi A, C1, C2 ter od E1 do E4 in od F1 do F3 iz standarda IEC 60404-1.
Magnetni materiali, ki se uporabljajo predvsem za releje ter železne in jeklene izdelke, razvrščeni le po koercivnosti, so zajeti v standardu IEC 60404-8-10. Standard IEC 60404-8-10 je manj omejujoč v smislu magnetnih lastnosti kot železa (razred A) in jekla na osnovi silikona (razreda C21 in C22), določeni v tem standardu, vendar podaja obširnejša odstopanja glede mer.
Neorientirana in orientirana jekla na osnovi silikona (C21 in C22) za industrijsko uporabo omrežnih frekvenc, razvrščena po določeni skupni izgubi, so zajeta v standardih IEC 60404-8-3, IEC 60404-8-4 in IEC 60404-8-7.
Neorientirani in orientirani tanki magnetni materiali za uporabo pri srednjih frekvencah, razvrščeni po določeni skupni izgubi, so zajeti v standardu IEC 60404-8-8.

General Information

• Status: Published
• Publication Date: 15-May-2017
• ICS: 29.030 - Magnetic materials
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Apr-2017
• Due Date: 01-Jul-2017
• Completion Date: 16-May-2017
• Ref Project: EN 60404-8-6:2017 - Magnetic materials - Part 8-6: Specifications for individual materials - Soft magnetic metallic materials

Relations

• Revised: SIST EN 60404-8-6:2009 - Magnetic materials - Part 8-6: Specifications for individual materials - Soft magnetic metallic materials (IEC 60404-8-6:1999 + A1:2007)
• Effective Date: 09-Feb-2016
• Replaces: SIST EN 60404-8-6:2009 - Magnetic materials - Part 8-6: Specifications for individual materials - Soft magnetic metallic materials (IEC 60404-8-6:1999 + A1:2007)
• Effective Date: 25-Apr-2017
• Replaces: SIST EN 60404-8-6:2009 - Magnetic materials - Part 8-6: Specifications for individual materials - Soft magnetic metallic materials (IEC 60404-8-6:1999 + A1:2007)
• Effective Date: 07-Jun-2022

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN 60404-8-6:2017
01-junij-2017
1DGRPHãþD
SIST EN 60404-8-6:2009
Magnetni materiali - 8-6. del: Specifikacije za posamezne materiale -
Mehkomagnetni kovinski material (IEC 60404-8-6:2016)
Magnetic materials - Part 8-6: Specifications for individual materials - Soft magnetic
metallic materials (IEC 60404-8-6:2016)
Magnetische Werkstoffe - Teil 8-6: Anforderungen an einzelne Werkstoffe -
Weichmagnetische metallische Werkstoffe (IEC 60404-8-6:2016)
Matériaux magnétiques - Partie 8-6: Spécifications pour matériaux particuliers -
Matériaux métalliques magnétiquement doux (IEC 60404-8-6:2016)
Ta slovenski standard je istoveten z: EN 60404-8-6:2017
ICS:
29.030 Magnetni materiali Magnetic materials
SIST EN 60404-8-6:2017 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 60404-8-6:2017

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SIST EN 60404-8-6:2017


EUROPEAN STANDARD EN 60404-8-6

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2017
ICS 29.030 Supersedes EN 60404-8-6:2009
English Version
Magnetic materials - Part 8-6: Specifications for individual
materials - Soft magnetic metallic materials
(IEC 60404-8-6:2016)
Matériaux magnétiques - Partie 8-6: Spécifications pour Magnetische Werkstoffe - Teil 8-6: Anforderungen an
matériaux particuliers - Matériaux métalliques einzelne Werkstoffe - Weichmagnetische metallische
magnétiquement doux Werkstoffe
(IEC 60404-8-6:2016) (IEC 60404-8-6:2016)
This European Standard was approved by CENELEC on 2017-01-12. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC
Management Centre or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.



European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN 60404-8-6:2017 E

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SIST EN 60404-8-6:2017
EN 60404-8-6:2017
European foreword
The text of document 68/528/CDV, future edition 3 of IEC 60404-8-6, prepared by IEC/TC 68
"Magnetic alloys and steels" was submitted to the IEC-CENELEC parallel vote and approved by
CENELEC as EN 60404-8-6:2017.

The following dates are fixed:
(dop) 2017-10-21
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2020-04-21
standards conflicting with the
document have to be withdrawn

This document supersedes EN 60404-8-6:2009.

Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC [and/or CEN] shall not be held responsible for identifying any or all such
patent rights.

Endorsement notice
The text of the International Standard IEC 60404-8-6:2016 was approved by CENELEC as a
European Standard without any modification.
In the official version, for Bibliography, the following note has to be added for the standard indicated:
ISO 286-1:2010 NOTE Harmonized as EN ISO 286-1:2010.

2

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SIST EN 60404-8-6:2017
EN 60404-8-6:2017

Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.
Publication Year Title EN/HD Year
IEC 60050-121 -  International Electrotechnical Vocabulary - -
(IEV) - Part 121: Electromagnetism
IEC 60050-131 -  International Electrotechnical Vocabulary - -
(IEV) - Part 131: Circuit theory
IEC 60050-221 -  International Electrotechnical Vocabulary - -
(IEV) - Chapter 221: Magnetic materials
and components
IEC 60404-1 -  Magnetic materials - Part 1: Classification - -
IEC 60404-2 -  Magnetic materials - Part 2: Methods of EN 60404-2 -
measurement of the magnetic properties of
electrical steel sheet and strip by means of
an Epstein frame
IEC 60404-4 -  Magnetic materials - Part 4: Methods of EN 60404-4 -
measurement of d.c. magnetic properties
of magnetically soft materials
IEC 60404-6 -  Magnetic materials - Part 6: Methods of EN 60404-6 -
measurement of the magnetic properties of
magnetically soft metallic and powder
materials at frequencies in the range 20 Hz
to 200 kHz by the use of ring specimens
IEC 60404-7 -  Magnetic materials - Part 7: Method of - -
measurement of the coercivity of magnetic
materials in an open magnetic circuit
IEC 60404-8-3 -  Magnetic materials - Part 8-3: - -
Specifications of individual materials -
Cold-rolled electrical non-alloyed and
alloyed steel sheet and strip delivered in
the semi-processed state
IEC 60404-8-4 -  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 60404-8-7 -  Magnetic materials - Part 8-7: - -
Specifications for individual materials -
Cold-rolled grain-oriented electrical steel
strip and sheet delivered in the fully-
processed state
IEC 60404-8-8 -  Magnetic materials - Part 8: Specifications - -
for individual materials - Section 8:
Specification for thin magnetic steel strip
for use at medium frequencies
IEC 60404-8-10 -  Magnetic materials - Part 8-10: - -
Specifications for individual materials -
Magnetic materials (iron and steel) for use
in relays
3

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SIST EN 60404-8-6:2017
EN 60404-8-6:2017
IEC 60404-9 -  Magnetic materials - Part 9: Methods of - -
determination of the geometrical
characteristics of magnetic steel sheet and
strip
IEC 60635 -  Toroidal strip-wound cores made of - -
magnetically soft material
ISO 404 -  Steel and steel products - General - -
technical delivery requirements
ISO 10474 -  Steel and steel products - Inspection - -
documents

4

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SIST EN 60404-8-6:2017



IEC 60404-8-6

®


Edition 3.0 2016-12




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE











Magnetic materials –

Part 8-6: Specifications for individual materials – Soft magnetic metallic

materials




Matériaux magnétiques –

Partie 8-6: Spécifications pour matériaux particuliers – Matériaux métalliques


magnétiquement doux













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 29.030 ISBN 978-2-8322-3674-1



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

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SIST EN 60404-8-6:2017
– 2 – IEC 60404-8-6:2016 © IEC 2016
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms, definitions and abbreviations . 7
3.1 Terms and definitions . 7
3.2 Abbreviations for test specimens . 8
4 Classification . 8
4.1 General . 8
4.2 Alloy class A (irons) . 9
4.3 Alloy class C (silicon steels). 9
4.4 Alloy class E (nickel-iron alloys) . 9
4.5 Alloy class F (cobalt-iron alloys) . 9
5 Designation . 9
6 General requirements . 9
6.1 Chemical composition and production process . 9
6.2 Delivery condition . 10
6.2.1 General . 10
6.2.2 Form of supply . 10
6.2.3 Surface condition . 10
7 Technical requirements . 10
7.1 Magnetic properties . 10
7.2 Geometric characteristics and tolerances . 11
7.2.1 Flat products: sheet, plate and strip . 11
7.2.2 Cold-worked bar, rod and wire . 11
7.2.3 Hot-finished bar . 11
8 Inspection and testing . 11
8.1 General . 11
8.2 Selection of samples . 12
8.2.1 General . 12
8.2.2 Flat products . 12
8.2.3 Long products . 12
8.2.4 Wire. 12
8.3 Magnetic properties . 12
8.3.1 Magnetic testing, DC measurements . 12
8.3.2 Magnetic testing, AC measurements . 12
8.3.3 Test specimens . 12
8.4 Geometric characteristics and tolerances . 12
8.4.1 Thickness of flat products . 12
8.4.2 Width of flat products . 12
8.4.3 Flatness . 12
8.4.4 Edge camber . 13
8.4.5 Dimensions of long products . 13
8.4.6 Straightness of long products . 13
8.5 Retests . 13
9 Complaints . 13
10 Ordering information . 13

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SIST EN 60404-8-6:2017
IEC 60404-8-6:2016 © IEC 2016 – 3 –
11 Certification . 13
Bibliography . 20

Table 1 – Chemical composition of the alloy classes in accordance with IEC 60404-1 . 14
Table 2 – Minimum amplitude permeability requirements for sheet and strip – AC
measurement (50 Hz or 60 Hz), sine flux conditions, thickness 0,05 mm to 0,38 mm . 15
Table 3 – DC magnetic property requirements for bar, billet, rod, sheet, strip and wire,
thickness or diameter greater than 0,05 mm – S.R., L.R. or E.S. specimen . 16
Table 4 – Maximum permeability rise factor for sheet and strip – L.R. test specimen,
AC measurement (50 Hz or 60 Hz) . 17
Table 5 – Dimensional requirements for toroidal strip-wound cores . 17
Table 6 – Tolerances on thickness of cold-rolled sheet and strip . 18
Table 7 – Tolerances on width of sheet and strip . 18
Table 8 – Tolerances on dimensions of cold-worked bar, rod and wire . 19

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SIST EN 60404-8-6:2017
– 4 – IEC 60404-8-6:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MAGNETIC MATERIALS –

Part 8-6: Specifications for individual materials –
Soft magnetic metallic materials

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 60404-8-6 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This third edition cancels and replaces the second edition published in 1999 and
Amendment 1:2007. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
Removal of Table 2b).

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SIST EN 60404-8-6:2017
IEC 60404-8-6:2016 © IEC 2016 – 5 –
The text of this standard is based on the following documents:
CDV Report on voting
68/528/CDV 68/552/RVC

Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all 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 publication will remain unchanged until
the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

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SIST EN 60404-8-6:2017
– 6 – IEC 60404-8-6:2016 © IEC 2016
MAGNETIC MATERIALS –

Part 8-6: Specifications for individual materials –
Soft magnetic metallic materials



1 Scope
This part of IEC 60404 specifies the general requirements, magnetic properties, geometric
characteristics and tolerances as well as inspection procedures for pure iron, silicon-iron,
nickel-iron and cobalt-iron. The materials are in the form of bar, billet, sheet, strip or wire. The
alloys covered correspond to those defined by classes A, C1, C2, E1 to E4 and F1 to F3 in
IEC 60404-1.
Magnetic materials used primarily for relays, iron and steel products, classified only by
coercivity, are covered in IEC 60404-8-10. IEC 60404-8-10 is less restrictive in terms of
magnetic properties than the irons (class A) and the silicon steels (classes C21 and C22)
specified in this standard, but it gives more comprehensive dimensional tolerances.
Non-oriented and oriented silicon steels (C21 and C22) for industrial power frequency
applications, classified by specific total loss, are covered in IEC 60404-8-3, IEC 60404-8-4
and IEC 60404-8-7.
Non-oriented and oriented thin magnetic materials for use at medium frequencies, classified
by specific total loss, are covered in IEC 60404-8-8.
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 60050-131, International Electrotechnical Vocabulary – Part 131: Circuit theory
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 sheet and strip by means of an Epstein frame
IEC 60404-4, Magnetic materials – Part 4: Methods of measurement of d.c. magnetic
properties of iron and steel
IEC 60404-6, Magnetic materials – Part 6: Methods of measurement of the magnetic
properties of magnetically soft metallic and powder materials at frequencies in the range
20 Hz to 200 kHz by the use of ring specimens

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SIST EN 60404-8-6:2017
IEC 60404-8-6:2016 © IEC 2016 – 7 –
IEC 60404-7, Magnetic materials – Part 7: Method of measurement of the coercivity of
magnetic materials in an open magnetic circuit
IEC 60404-8-3, Magnetic materials − Part 8-3: Specifications for individual materials − Cold-
rolled electrical non-alloyed and alloyed steel sheet and strip delivered in the semi-processed
state
IEC 60404-8-4, 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 60404-8-7, Magnetic materials – Part 8-7: Specifications for individual materials – Cold-
rolled grain-oriented electrical steel strip and sheet delivered in the fully-processed state
IEC 60404-8-8, Magnetic materials – Part 8: Specifications for individual materials –
Section 8: Specification for thin magnetic steel strip for use at medium frequencies
IEC 60404-8-10, Magnetic materials – Part 8-10: Specifications for individual materials –
Magnetic materials (iron and steel) for use in relays
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of magnetic steel sheet and strip
IEC 60635, Toroidal strip-wound cores made of magnetically soft material
ISO 404, Steel and steel products – General technical delivery requirements
ISO 10474, Steel and steel products – Inspection documents
3 Terms, definitions and abbreviations
3.1 Terms and definitions
For the purpose of this document, the terms and definitions given in IEC 60050-121,
IEC 60050-131, 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
3.1.1
bar
solid product of uniform cross-section supplied in straight lengths
Note 1 to entry: The cross-section can be round, square, rectangular or regular polygonal.
Note 2 to entry: Flat: A bar of rectangular cross-section, rolled on the four faces, whose thickness is generally
5 mm or greater and whose width is not greater than 150 mm.
Note 3 to entry: Round: A bar of circular cross-section whose diameter is generally 8 mm or greater.
3.1.2
billet
solid product of uniform cross-section, which may be square, round or rectangular, with a
width less than twice the thickness

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SIST EN 60404-8-6:2017
– 8 – IEC 60404-8-6:2016 © IEC 2016
3.1.3
heat
product of a furnace melt or of a number of melts that are mixed prior to casting
3.1.4
lot
material from the same heat, of the same form, produced at the same time and, if annealed,
heat-treated together or sequentially in a continuous furnace
3.1.5
rod
cold-drawn product of uniform rectangular or round cross-section, supplied in straight lengths
3.1.6
sheet and plate
flat-rolled product of uniform cross-section, supplied in coils or cut lengths where the width is
over 600 mm
Note 1 to entry: Sheets have a thickness under 5 mm and plates have a thickness over 5 mm.
3.1.7
straightness of long products
greatest distance between the bar and the line joining the two ends of the bar
3.1.8
strip
flat-rolled product of uniform cross-section, supplied in coils or cut lengths where the width is
under 600 mm and the thickness under 5 mm
3.1.9
wire
rolled or drawn product of uniform round or rectangular cross-section, supplied in coils
3.2 Abbreviations for test specimens
Type E.S.: Elongated specimen for test samples, of circular, rectangular or polygonal cross-
section, with a length to diameter ratio of at least 5/1, according to IEC 60404-7.
Type L.R.: Laminated rings stamped or etched from flat products (for magnetic head ring, a
core with 10 mm outside diameter and 6 mm inside diameter can be used).
Type S.R.: Solid rings or square frames, formed or machined from solid material. The outside
diameter of the ring shall be between 30 mm and 50 mm, with an outside/inside diameter ratio
from 1,2 to 1,4.
NOTE Types L.R. and S.R. are only applicable to essentially isotropic materials.
Type S.W.: Strip-wound cores as defined by IEC 60635. For dimensional restrictions, see
Table 5. The outside diameters of test cores are between 30 mm and 80 mm.
4 Classification
4.1 General
The materials covered by this document are classified according to the main alloying element
and the content of this element. The subclassification takes into account the different uses of
the alloys.

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SIST EN 60404-8-6:2017
IEC 60404-8-6:2016 © IEC 2016 – 9 –
4.2 Alloy class A (irons)
This material is classified according to the maximum value of coercivity.
4.3 Alloy class C (silicon steels)
Alloy C1, in which the main alloying element is silicon with a content up to approximately 5 %
, is classified according to the maximum value of coercivity.
Alloys C2, in which the main alloying element is silicon with a content up to approximately
5 %, are classified according to the shape of the hysteresis loop and the minimum amplitude
permeability in an AC measurement (50 Hz or 60 Hz) with a L.R. specimen made of material

with a thickness of 0,35 mm; the measuring point is H = 1,6 A/m.
4.4 Alloy class E (nickel-iron alloys)
These alloys are classified according to the shape of the hysteresis loop and the minimum
amplitude permeability in an AC measurement (50 Hz or 60 Hz), under sine flux conditions,
with a S.W. specimen made of material with a thickness of 0,10 mm.
4.5 Alloy class F (cobalt-iron alloys)
These alloys are classified according to the shape of the hysteresis loop and to the maximum
value of coercivity.
5 Designation
The conventional designation of the materials comprises the following in the order given:
a) the letter for the alloy class: A, C, E or F (see Table 1);
b) the number according to the content of the main alloying element (see Table 1);
c) for alloy classes C, E and F, the number 1 or 2 according to the shape of the hysteresis
loop:
1) = round (non-oriented)
2) = rectangular (oriented by texture or by thermomagnetic treatment);
d) a dash;
e) depending on the alloy class, either the maximum value for the coercivity in amperes per
metre or the peak value of the minimum permeability divided by 1 000 for a given
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magnetic fi
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