IEC 60404-8-6:2016

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

IEC 60404-8-6:2016 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. This edition includes the following significant technical changes with respect to the previous edition: Removal of Table 2b).

Matériaux magnétiques - Partie 8-6: Spécifications pour matériaux particuliers - Matériaux métalliques magnétiquement doux

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).

General Information

• Status: Published
• Publication Date: 07-Dec-2016
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: WG 4 - TC 68/WG 4
• Current Stage: PPUB - Publication issued
• Start Date: 15-Feb-2017
• Completion Date: 08-Dec-2016

Standards Content (Sample)

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

IEC 60404-8-6:2016-12(en-fr)

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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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– 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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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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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,
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Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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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
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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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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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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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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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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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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

magnetic field strength ( H = 0,4 A/m or 1,6 A/m) and a given thickness measured with a
certain test specimen (see above under classification).
EXAMPLE:
E31-10: nickel-iron with 40 % to 51 % weight of nickel, a round hysteresis loop, and a minimum amplitude
ˆ
permeability of 10 000 at the peak value of the magnetic field strength H of 0,4 A/m at 50 Hz or 60 Hz for a strip-
wound core made of a sheet with a thickness of 0,10 mm.
6 General requirements
6.1 Chemical composition and production process
The typical composition of each of the alloy classes covered by this document is given in
Table 1.
The actual composition and production process are left to the discretion of the manufacturer,
unless otherwise agreed between the manufacturer and purchaser, and specified in the order.

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6.2 Delivery condition
6.2.1 General
The materials covered by this standard may be delivered in the hot-finished, cold-worked or
annealed condition. The condition required shall be specified in the order.
6.2.2 Form of supply
Coils 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 that they do not collapse under their own weight.
Coils can occasionally present welds or interleaves resulting from the removal of defective
zones, subject to prior agreement between the parties. The value of the additional thickness
due to the weld is subject to special agreement. If necessary, the marking of welds or
interleaves may form the subject of a special agreement. For coils containing repair welds or
interleaves, each part of the strip shall be of the same quality material.
The edges of parts welded together shall not be so much out of alignment as to affect the
further processing of the material.
The mass of coils shall be agreed upon at the time of ordering.
6.2.3 Surface condition
The surface condition of sheets or strips shall be uniform, clean, and free from grease and
rust.
Isolated imperfections such as scratches, blisters, etc. may be tolerated if the thickne
...