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

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, pure 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 pure iron material (class A) and the silicon-iron alloys (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 60404-8-2, 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

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

Magnetni materiali - 8-6. del: Specifikacije za posamezne materiale - Mehkomagnetni kovinski materiali (IEC 60404-8-6:1999 + A1:2007)

General Information

Status
Withdrawn
Publication Date
07-Jan-2009
Drafting Committee
Parallel Committee
Current Stage
6060 - Document made available
Start Date
08-Jan-2009
Due Date
07-Feb-2009
Completion Date
08-Jan-2009

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SLOVENSKI STANDARD
SIST EN 60404-8-6:2009
01-april-2009
Magnetni materiali - 8-6. del: Specifikacije za posamezne materiale -
Mehkomagnetni kovinski materiali (IEC 60404-8-6:1999 + A1:2007)

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

metallic materials (IEC 60404-8-6:1999 + A1:2007)
Magnetische Werkstoffe - Teil 8-6: Anforderungen an einzelne Werkstoffe -
Weichmagnetische metallische Werkstoffe (IEC 60404-8-6:1999 + A1:2007)
Matériaux magnétiques - Partie 8-6: Spécifications pour matériaux particuliers -
Matériaux métalliques magnétiquement doux (CEI 60404-8-6:1999 + A1:2007)
Ta slovenski standard je istoveten z: EN 60404-8-6:2009
ICS:
29.030 Magnetni materiali Magnetic materials
SIST EN 60404-8-6:2009 en,fr

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN 60404-8-6:2009
---------------------- Page: 2 ----------------------
SIST EN 60404-8-6:2009
EUROPEAN STANDARD
EN 60404-8-6
NORME EUROPÉENNE
January 2009
EUROPÄISCHE NORM
ICS 29.030
English version
Magnetic materials -
Part 8-6: Specifications for individual materials -
Soft magnetic metallic materials
(IEC 60404-8-6:1999 + A1:2007)
Matériaux magnétiques - Magnetische Werkstoffe -
Partie 8-6: Spécifications Teil 8-6: Anforderungen
pour matériaux particuliers - an einzelne Werkstoffe -
Matériaux métalliques Weichmagnetische metallische
magnétiquement doux Werkstoffe
(CEI 60404-8-6:1999 + A1:2007) (IEC 60404-8-6:1999 + A1:2007)

This European Standard was approved by CENELEC on 2008-12-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.

CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the

Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,

Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: avenue Marnix 17, B - 1000 Brussels

© 2009 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60404-8-6:2009 E
---------------------- Page: 3 ----------------------
SIST EN 60404-8-6:2009
EN 60404-8-6:2009 – 2 –
Foreword

The text of the International Standard IEC 60404-8-6:1999 + A1:2007, prepared by IEC TC 68, Magnetic

alloys and steels, was submitted to the Unique Acceptance Procedure and was approved by CENELEC

as EN 60404-8-6 on 2008-12-01 without any modification.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement
(dop) 2009-12-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn
(dow) 2011-12-01
Annex ZA has been added by CENELEC.
__________
Endorsement notice

The text of the International Standard IEC 60404-8-6:1999 + A1:2007 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 NOTE Harmonized as EN 20286-1:1993 (not modified).
__________
---------------------- Page: 4 ----------------------
SIST EN 60404-8-6:2009
– 3 – EN 60404-8-6:2009
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

The following referenced documents are indispensable for the application 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.

NOTE Where an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60050-121 1978 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 121: Electromagnetism
IEC 60050-131 1978 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 131: Electric and magnetic circuits
IEC 60050-221 1990 International Electrotechnical Vocabulary - -
(IEV) -
Chapter 221: Magnetic materials and
components
IEC 60404-1 1979 Magnetic materials - - -
Part 1: Classification
IEC 60404-2 1996 Magnetic materials - EN 60404-2 1998
Part 2: Methods of measurement of the
magnetic properties of electrical steel sheet
and strip by means of an Epstein frame
IEC 60404-4 1995 Magnetic materials - EN 60404-4 1997
Part 4: Methods of measurement of d.c.
magnetic properties of magnetically soft
materials
IEC 60404-6 1986 Magnetic materials - - -
Part 6: Methods of measurement of the
magnetic properties of isotropic nickel-iron
soft magnetic alloys, types E1, E3 and E4
IEC 60404-7 1982 Magnetic materials - - -
Part 7: Method of measurement of the
coercivity of magnetic materials in an open
magnetic circuit
IEC 60404-8-2 1998 Magnetic materials - - -
Part 8-2: Specifications
for individual materials - Cold-rolled electrical
alloyed steel sheet and strip delivered in the
semi-processed state
———————

IEC 60404-6:1986 is superseded by IEC 60404-6:2003, which is harmonized as EN 60404-6:2003.

---------------------- Page: 5 ----------------------
SIST EN 60404-8-6:2009
EN 60404-8-6:2009 – 4 –
Publication Year Title EN/HD Year
IEC 60404-8-4 1998 Magnetic materials - - -
Part 8-4: Specifications
for individual materials - Cold-rolled
non-oriented electrical steel sheet and strip
delivered in the fully-processed state
IEC 60404-8-7 1998 Magnetic materials - - -
Part 8-7: Specifications
for individual materials - Cold-rolled
grain-oriented electrical steel sheet and strip
delivered in the fully-processed state
IEC 60404-8-8 1991 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 1994 Magnetic materials - - -
Part 8: Specifications for individual materials -
Section 10: Specification for magnetic
materials (iron and steel) for use in relays
IEC 60404-9 1987 Magnetic materials - - -
Part 9: Methods of determination of the
geometrical characteristics of magnetic steel
sheet and strip
IEC 60635 1978 Toroidal strip-wound cores made of - -
magnetically soft material
ISO 404 1992 Steel and steel products - General technical - -
delivery requirements
ISO 10474 1991 Steel and steel products - Inspection - -
documents
---------------------- Page: 6 ----------------------
SIST EN 60404-8-6:2009
INTERNATIONAL IEC
STANDARD
CEI
60404-8-6
NORME
Edition 2.1
INTERNATIONALE
2007-06
Edition 2:1999 consolidated with amendment 1:2007
Edition 2:1999 consolidée par l'amendement 1:2007
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
PRICE CODE
Commission Electrotechnique Internationale CODE PRIX
International Electrotechnical Commission
МеждународнаяЭлектротехническаяКомиссия
For price, see current catalogue
Pour prix, voir catalogue en vigueur
---------------------- Page: 7 ----------------------
SIST EN 60404-8-6:2009
– 2 – 60404-8-6 © IEC:1999+A1:2007
CONTENTS

FOREWORD...........................................................................................................................3

1 Scope...............................................................................................................................4

2 Normative references........................................................................................................4

3 Definitions ........................................................................................................................5

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

4.1 Alloy class A (pure iron)...........................................................................................7

4.2 Alloy class C (silicon-iron)........................................................................................7

4.3 Alloy class E (nickel-iron).........................................................................................7

4.4 Alloy class F (cobalt-iron) ........................................................................................7

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

6 General requirements .......................................................................................................8

6.1 Chemical composition and production process .........................................................8

6.2 Delivery condition ....................................................................................................8

7 Technical requirements.....................................................................................................8

7.1 Magnetic properties .................................................................................................8

7.2 Geometric characteristics and tolerances.................................................................9

8 Inspection and testing.......................................................................................................9

8.1 General ...................................................................................................................9

8.2 Selection of samples..............................................................................................10

8.3 Magnetic properties ...............................................................................................10

8.4 Geometric characteristics and tolerances...............................................................11

8.5 Retests..................................................................................................................11

9 Complaints .....................................................................................................................11

10 Ordering information .......................................................................................................12

11 Certification ....................................................................................................................12

Bibliography ..........................................................................................................................18

Table 1 – Chemical composition of the alloy classes in accordance with IEC 60404-1 ............12

Table 2 – Minimum permeability requirements .......................................................................

Table 2a – 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........13

Table 2b – Minimum serial inductance permeability requirements for sheet and strip –

AC measurement (0,3 kHz, 1 kHz, 3 kHz, 10 kHz and 30 kHz),

thickness 0,025 mm to 0,35 mm ............................................................................................14

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...........................15

Table 4 – Maximum permeability rise factor for sheet and strip –

L.R. test specimen, a.c. measurement (50 Hz or 60 Hz).........................................................16

Table 5 – Dimensional requirements for toroidal strip-wound cores ........................................16

Table 6 – Tolerances on thickness of cold-rolled sheet and strip............................................16

Table 7 – Tolerances on width of sheet and strip ...................................................................17

Table 8 – Tolerances on dimensions of cold-worked bar, rod and wire ...................................17

---------------------- Page: 8 ----------------------
SIST EN 60404-8-6:2009
60404-8-6 © IEC:1999+A1:2007 – 3 –
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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 consolidated version of IEC 60404-8-6 consists of the second edition (1999) [documents

68/197/FDIS and 68/200/RVD] and its amendment 1 (2007) [documents 68/325A/CDV and

68/328/RVC].

The technical content is therefore identical to the base edition and its amendment(s) and has

been prepared for user convenience.
It bears the edition number 2.1.

A vertical line in the margin shows where the base publication has been modified by

amendment 1.
---------------------- Page: 9 ----------------------
SIST EN 60404-8-6:2009
– 4 – 60404-8-6 © IEC:1999+A1:2007
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, pure 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 pure iron material (class A) and the silicon-iron alloys (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 60404-8-2, 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 referenced documents are indispensable for the application 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):1978, International Electrotechnical Vocabulary (IEV) – Chapter 121: Electro-

magnetism

IEC 60050(131):1978, International Electrotechnical Vocabulary (IEV) – Chapter 131: Electric

and magnetic circuits

IEC 60050(221):1990, International Electrotechnical Vocabulary (IEV) – Chapter 221: Magnetic

materials and components
IEC 60404-1:1979, Magnetic materials – Part 1: Classification

IEC 60404-2:1996, Magnetic materials – Part 2: Methods of measurement of the magnetic

properties of electrical steel sheet and strip by means of an Epstein frame

IEC 60404-4:1995, Magnetic materials – Part 4: Methods of measurement of d.c. magnetic

properties of iron and steel

IEC 60404-6:1986, Magnetic materials – Part 6: Methods of measurement of the magnetic

properties of isotropic nickel-iron soft magnetic alloys, types E1, E3 and E4
---------------------- Page: 10 ----------------------
SIST EN 60404-8-6:2009
60404-8-6 © IEC:1999+A1:2007 – 5 –

IEC 60404-7:1982, Magnetic materials – Part 7: Method of measurement of the coercivity of

magnetic materials in an open magnetic circuit

IEC 60404-8-2:1998, Magnetic materials – Part 8-2: Specifications for individual materials –

Cold-rolled electrical alloyed steel sheet and strip delivered in the semi-processed state

IEC 60404-8-4:1998, Magnetic materials – Part 8-4: Specifications for individual materials –

Cold-rolled non-oriented electrical steel sheet and strip delivered in the fully-processed state

IEC 60404-8-7:1998, Magnetic materials – Part 8-7: Specifications for individual materials –

Cold-rolled grain-oriented electrical steel sheet and strip delivered in the fully-processed state

IEC 60404-8-8:1991, Magnetic materials – Part 8: Specifications for individual materials –

Section 8: Specification for thin magnetic steel strip for use at medium frequencies

IEC 60404-8-10:1994, Magnetic materials – Part 8: Specifications for individual materials –

Section 10: Specification for magnetic materials (iron and steel) for use in relays

IEC 60404-9:1987, Magnetic materials – Part 9: Methods of determination of the geometrical

characteristics of magnetic steel sheet and strip
IEC 60635:1978, Toroidal strip-wound cores made of magnetically soft material
ISO 404:1992, Steel and steel products – General technical delivery requirements
ISO 10474:1991, Steel and steel products – Inspection documents
3 Definitions

For the purpose of this part of IEC 60404, the definitions of the principal terms relative

to magnetic properties and to electric and magnetic circuits given in IEC 60050(121),

IEC 60050(131) and IEC 60050(221) apply, as well as the following definitions.
3.1
ageing
change of coercivity, expressed as a percentage, resulting from heat treatment
3.2
bar

solid product of uniform cross-section supplied in straight lengths. The cross-section may be

round, square, rectangular or regular polygonal.

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

round: A bar of circular cross-section whose diameter is generally 8 mm or greater

3.3
billet

solid product of uniform cross-section, which may be square, round or rectangular, with a width

less than twice the thickness
3.4
edge camber

the edge camber is characterized by the greatest distance between an edge of the sheet and

the line joining the two extremities of the measured length of this edge (see IEC 60404-9)

---------------------- Page: 11 ----------------------
SIST EN 60404-8-6:2009
– 6 – 60404-8-6 © IEC:1999+A1:2007
3.5
flatness (wave factor)

the flatness of a sheet is characterized by the wave factor, which is the relation of the height of

the wave to its length (see IEC 60404-9)
3.6
heat

product of a furnace melt or of a number of melts that are mixed prior to casting

3.7
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
3.8
rod

cold-drawn product of uniform rectangular or round cross-section, supplied in straight lengths

3.9
sheet and plate

flat-rolled product of uniform cross-section, supplied in coils or cut lengths. The width is over

600 mm; sheets have a thickness under 5 mm and plates have a thickness over 5 mm
3.10
straightness of long products

straightness is characterized by the greatest distance between the bar and the line joining the

two ends of the bar
3.11
strip

flat-rolled product of uniform cross-section, supplied in coils or cut lengths. The width is under

600 mm and the thickness under 5 mm
3.12
wire

rolled or drawn product of uniform round or rectangular cross-section, supplied in coils

3.13 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 cores of stamped or etched rings (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.
---------------------- Page: 12 ----------------------
SIST EN 60404-8-6:2009
60404-8-6 © IEC:1999+A1:2007 – 7 –
4 Classification

The materials covered by this standard 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.
4.1 Alloy class A (pure iron)
This material is classified according to the maximum value of coercivity.
4.2 Alloy class C (silicon-iron)

Alloy C1, with 0 % to 5 % weight of silicon, is classified according to the maximum value of

coercivity.

Alloys C2, with 0,4 % to 5 % weight of silicon, are classified according to the shape of the

hysteresis loop and the minimum permeability in an a.c. measurement with a L.R. specimen

made of material with a thickness of 0,35 mm; the measuring point is H = 1,6 A/m.

4.3 Alloy class E (nickel-iron)

These alloys are classified according to the shape of the hysteresis loop and the minimum

amplitude permeability in an a.c. 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.
4.4 Alloy class F (cobalt-iron)

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 45 % to 50 % weight of nickel, a round hysteresis loop, and a minimum

permeability of 10 000 for a strip-wound core made of a sheet with a thickness of 0,10 mm.

---------------------- Page: 13 ----------------------
SIST EN 60404-8-6:2009
– 8 – 60404-8-6 © IEC:1999+A1:2007
6 General requirements
6.1 Chemical composition and production process

The typical composition of each of the material classes covered by this standard 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.

6.2 Delivery condition

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.
6.2.1 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.
6.2.2 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 thickness

remains within the tolerance limits and the manufacture or performance of the final product is

not affected.

The nature of the surface condition will depend on the final treatment. For material in the hot-

rolled condition, the material exhibits a hot mill scale.
7 Technical requirements
7.1 Magnetic properties

Unless otherwise required by the order, the magnetic properties shall be determined for each

lot of material on a representative sample taken from the lot and heat-treated in accordance

with the recommendations of the manufacturer or as specified by the purchaser. Acceptance

testing of sheets and strips shall be carried out by a.c. testing of laminated rings (type L.R.) or

strip-wound cores (type S.W.), or by d.c. testing of either solid rings (type S.R.), laminated

rings (type L.R.) or elongated specimens (type E.S.).
---------------------- Page: 14 ----------------------
SIST EN 60404-8-6:2009
60404-8-6 © IEC:1999+A1:2007 – 9 –

The properties shall meet the magnetic requirements specified in Tables 2 to 4 for the alloy,

the magnetic grade and the thickness specified in the order. For intermediate thicknesses not

given in the table, the values for the next thicker group shall apply. When a.c. magnetic testing

is used to demonstrate conformance of the alloy to this standard, either amplitude permeability

measurements (Table 2a) or serial inductance permeability measurements (Table 2b) can be

used. It is not a
...

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