IEC 60404-8-10:2009

Magnetic materials - Part 8-10: Specifications for individual materials - Magnetic materials (iron and steel) for use in relays

IEC 60404-8-10:2009 specifies the general requirements, magnetic properties, geometric characteristics and tolerances as well as inspection procedures for magnetic materials used primarily for relays. This standard applies to pure iron, non-alloyed and alloyed steel and ferritic stainless steel products usually delivered in either the semi-processed or fully-processed state. These materials correspond to classes A, B, C and D.3 of IEC 60404-1. This second edition cancels and replaces the first edition published in 1994 and constitutes a technical revision. The main modifications from the previous edition of the standard are as follows:
- introduction of the ferritic stainless steels and the fully-processed state in the scope of the standard (see Clause 1);
- modification of the designation with the letter R at the beginning and the condition and state at the end (see Clause 5);
- introduction of the new grades R160 and R320 (see Table 2);
- modification of the requirements for the heat treatment of test specimens for semi-processed material (see Subclause 8.3.1);
- indication in Bibliography of standards referred to in this standard as an information.

Matériaux magnétiques - Partie 8-10: Spécifications pour matériaux particuliers - Matériaux magnétiques (fer et acier) pour relais

La CEI 60404-8-10:2009 spécifie les exigences générales, les caractéristiques magnétiques, les caractéristiques géométriques et tolérances ainsi que les conditions de contrôle des matériaux magnétiques employés principalement pour les relais. La présente norme est applicable aux produits en fer pur, en acier non allié et acier allié et en acier inoxydable ferritique habituellement livrés à l'état semi-fini ou à l'état fini. Ces matériaux correspondent aux classes A, B, C et D.3 de la CEI 60404-1. Cette deuxième édition annule et remplace la première édition parue en 1994, dont elle constitue une révision technique. Les modifications principales de la norme par rapport à l'édition précédente sont les suivantes:
- introduction des aciers inoxydables ferritiques et l'état fini dans le domaine d'application de la norme (voir Article 1);
- modification de la désignation avec la lettre R au début et l'état de livraison et l'état à la fin (voir Article 5);
- introduction de nouvelles nuances R160 et R320 (voir Tableau 2);
- modification des exigences pour le traitement thermique des éprouvettes pour les produits à l'état semi-fini (voir Paragraphe 8.3.1);
- indication dans la bibliographie des normes référencées dans la présente norme à titre d'information.

General Information

• Status: Published
• Publication Date: 18-May-2009
• ICS: 29.030 - Magnetic materials
• Technical Committee: TC 68 - Magnetic alloys and steels
• Drafting Committee: JWG 1 - TC 68/JWG 1
• Current Stage: PPUB - Publication issued
• Start Date: 15-Jun-2009
• Completion Date: 19-May-2009

Standards Content (Sample)

IEC 60404-8-10 ®
Edition 2.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-10: Specifications for individual materials – Magnetic materials (iron and
steel) for use in relays
Matériaux magnétiques –
Partie 8-10: Spécifications pour matériaux particuliers – Matériaux magnétiques
(fer et acier) pour relais
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IEC 60404-8-10 ®
Edition 2.0 2009-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Magnetic materials –
Part 8-10: Specifications for individual materials – Magnetic materials (iron and
steel) for use in relays
Matériaux magnétiques –
Partie 8-10: Spécifications pour matériaux particuliers – Matériaux magnétiques
(fer et acier) pour relais
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 29.030 ISBN 978-2-88910-189-4
– 2 – 60404-8-10 © IEC:2009
CONTENTS
FOREWORD.4
1 Scope.6
2 Normative references .6
3 Terms and definitions .6
4 Classification.7
5 Designation .7
6 General requirements .8
6.1 Production process.8
6.2 Form of supply .8
6.2.1 Strip .8
6.2.2 Sheet and plate .8
6.2.3 Flats and bars .9
6.2.4 Wire rod and wire .9
6.3 Delivery condition and state .9
6.4 Surface condition .9
7 Technical requirements .9
7.1 Magnetic properties.9
7.2 Geometric characteristics and tolerances .10
7.2.1 Thickness of flat products.10
7.2.2 Diameter or side dimension of long products .12
7.2.3 Width of flat products.13
7.2.4 Flatness (wave factor) of flat products .14
7.2.5 Length .15
7.2.6 Edge camber for flat products.16
7.2.7 Straightness of hot-rolled flats and bars.16
8 Inspection.17
8.1 General .17
8.2 Selection of samples .17
8.2.1 General .17
8.2.2 Flat products .17
8.2.3 Long products.18
8.2.4 Wire rod and wire .18
8.3 Preparation of test specimens .18
8.3.1 Coercivity .18
8.3.2 Geometrical characteristics and tolerances.18
8.4 Test methods .18
8.4.1 General .18
8.4.2 Coercivity .19
8.4.3 Thickness of flat products.19
8.4.4 Width of flat products.19
8.4.5 Flatness (wave factor) of flat products .19
8.4.6 Edge camber of flat products .19
8.4.7 Dimensions of long products.19
8.4.8 Straightness of long products .19
8.4.9 Retest .19
9 Complaints .19

60404-8-10 © IEC:2009 – 3 –
10 Ordering information.19
Bibliography.21

Table 1 – Types of delivery condition and state .9
Table 2 – Coercivity and availability of grades .10
Table 3 – Tolerances on thickness for hot-rolled strip and sheet .10
Table 4 – Tolerances on thickness for hot-rolled plates.11
Table 5 – Tolerances on thickness for cold-rolled flat products .11
Table 6 – Tolerances on thickness for hot-rolled flats .11
Table 7 – Tolerances on diameter for hot-rolled rounds .12
Table 8 – Tolerances on side dimension for hot-rolled squares .12
Table 9 – Tolerances on the dimension of wire rod .12
Table 10 – Tolerances on the diameter of wire.13
Table 11 – Tolerances on width for hot-rolled strip and sheet .13
Table 12 – Tolerances on width for hot-rolled plate.13
Table 13 – Tolerances on width for cold-rolled flat products.14
Table 14 – Tolerances on width for hot-rolled flats .14
Table 15 – Tolerances on flatness for hot-rolled strip and sheet .14
Table 16 – Tolerances on flatness for hot-rolled plate.15
Table 17 – Tolerances on flatness for cold-rolled flat products.15
Table 18 – Tolerances on length for hot-rolled sheet.15
Table 19 – Tolerances on length for hot-rolled plate .16
Table 20 – Tolerances on length for cold-rolled flat products .16
Table 21 – Tolerances on straightness for hot-rolled flats .17
Table 22 – Tolerances on straightness for hot-rolled rounds and squares .17

– 4 – 60404-8-10 © IEC:2009
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-10: Specifications for individual materials –
Magnetic materials (iron and steel)
for use in relays
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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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
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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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.
International Standard IEC 60404-8-10 has been prepared by IEC technical committee 68:
Magnetic alloys and steels, in collaboration with ISO technical committee 17: Steel.
This second edition cancels and replaces the first edition published in 1994 and constitutes a
technical revision. The main modifications from the previous edition of the standard are as
follows:
• introduction of the ferritic stainless steels and the fully-processed state in the scope of
the standard (see Clause 1);
• modification of the designation with the letter R at the beginning and the condition and
state at the end (see Clause 5);
• introduction of the new grades R160 and R320 (see Table 2);
• modification of the requirements for the heat treatment of test specimens for semi-
processed material (see Subclause 8.3.1);

60404-8-10 © IEC:2009 – 5 –
• indication in Bibliography of standards referred to in this standard as an information.
The text of this standard is based on the following documents:
FDIS Report on voting
68/387/FDIS 68/391/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all the parts in the IEC 60404 series, 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 maintenance result date indicated on the IEC web site 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.
– 6 – 60404-8-10 © IEC:2009
MAGNETIC MATERIALS –
Part 8-10: Specifications for individual materials –
Magnetic materials (iron and steel)
for use in relays
1 Scope
This International Standard specifies the general requirements, magnetic properties,
geometric characteristics and tolerances as well as inspection procedures for magnetic
materials used primarily for relays.
This standard applies to pure iron, non-alloyed and alloyed steel and ferritic stainless steel
products usually delivered in either the semi-processed or fully-processed state.
These materials correspond to classes A, B, C and D.3 of IEC 60404-1.
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, 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 60404-7, Magnetic materials – Part 7: Method of measurement of the coercivity of
magnetic materials in an open magnetic circuit
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of magnetic steel sheet and strip
ISO 286-1, ISO system of limits and fits – Part 1: Bases of tolerances, deviations and fits
ISO 404, Steel and steel products – General technical delivery requirements
ISO 10474, Steel and steel products – Inspection documents
3 Terms and definitions
For the purpose of this document, the definitions of the principal terms related to magnetic
properties given in IEC 60050-121, IEC 60050-221 and IEC 60404-9 apply, as well as the
following definitions:
3.1
sheet and plate
flat rolled product with a minimum width of 600 mm

60404-8-10 © IEC:2009 – 7 –
NOTE 1 The edges may be as rolled, mechanically sheared or flame cut.
NOTE 2 The distinction between sheet and plate is principally in terms of thickness tolerances (see Tables 3 and
4). Further information can be found in ISO 6929.
3.2
strip
flat rolled product which, immediately after the final rolling pass or after pickling or continuous
annealing, is wound into a regular coil
NOTE As rolled, strip has slightly convex edges; strip may also be supplied with sheared edges or slit from wider
strip.
3.3
flat
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
3.4
round
bar having a circular cross-section whose diameter is generally 8 mm or greater
3.5
square
bar having a square cross-section whose side dimension is generally 8 mm or greater
3.6
wire rod
hot-rolled long product whose nominal size is generally 5 mm or greater, wound into irregular
coils
NOTE The cross-section may be round, oval, square, rectangular, hexagonal, octogonal, half-round or of any
similar shape.
3.7
wire
product of constant full cross-section along its length, obtained by cold-drawing which can be
wound into irregular or regular coils
NOTE It is obtained by cold-drawing wire rod through a reducing die or passing it under pressure between rollers
and rewinding the drawn product.
4 Classification
The materials covered by this standard are classified according to the maximum value of
coercivity, the shape and dimensions of the material and its final condition and state. Not all
materials are available in the cold-rolled condition throughout the thickness range.
5 Designation
The conventional designation of the material comprises the following in the order given:
a) the letter R;
b) the specified maximum value of coercivity in A/m;
c) one of the following symbols:
F: for pure iron;
S: for ferritic stainless steel;
T: for alloyed steel;
– 8 – 60404-8-10 © IEC:2009
U: for non-alloyed steel;
d) the condition as indicated below:
H: hot-rolled;
C: cold-rolled or cold-drawn;
e) the state as indicated below:
S: semi-processed;
F: fully-processed.
EXAMPLE R80THF: alloyed steel having a specified maximum coercivity of 80 A/m supplied in the hot-rolled
condition and the fully-processed state.
6 General requirements
6.1 Production process
The production process of the materials specified by this standard is left to the discretion
of the manufacturer.
6.2 Form of supply
6.2.1 Strip
The products can be supplied in the hot-rolled or cold-rolled condition and in the semi-
processed or fully-processed state.
The products shall be delivered as strip in coils (with a minimum internal diameter not less
than 500 mm) or in cut lengths.
Strip supplied in coils shall be of constant width and wound in such a manner that the edges
are superimposed in a regular manner and that the side faces of the coil are substantially flat.
Coils shall be sufficiently tightly wound that they do not collapse under their own weight.
Strip can occasionally exhibit welds or interleaves resulting from the removal of defective
zones, subject to prior agreement between the manufacturer and the purchaser. 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 Sheet and plate
Sheets can be supplied in the hot-rolled or cold-rolled condition; plates are supplied in the
hot-rolled condition. Sheets and plates can be supplied in the semi-processed or fully-
processed state.
The edges of the sheet or plate, parallel to the rolling direction shall be as rolled,
mechanically sheared or flame cut.

60404-8-10 © IEC:2009 – 9 –
6.2.3 Flats and bars
The products can be supplied in the hot-rolled, cold-rolled or cold-drawn condition and in the
semi-processed or fully-processed state.
6.2.4 Wire rod and wire
Wire rod and wire are supplied respectively in the hot-rolled condition and in the cold-drawn
condition. Wire rod and wire are supplied in the semi-processed state.
The products are delivered in the form of coils, the mass of which shall be specified at the
time of ordering.
6.3 Delivery condition and state
The different types of delivery condition and state are given in Table 1.
Table 1 – Types of delivery condition and state
Condition State
Type of
product
Hot-rolled Cold-rolled Cold-drawn Semi-processed Fully-processed
Strip X X X X
Sheet X X X X
Plate X  X X
Flats and bars X X X X X
Wire rod X  X
Wire  X X
6.4 Surface condition
The surface of the product shall be smooth and clean, free from grease and rust.
Isolated imperfections such as scratches, blisters, etc. can be tolerated if the thickness
remains within the tolerance limits.
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. Hot-rolled material can be supplied with
the scale removed by mechanical means or pickling if so specified at the time of ordering.
7 Technical requirements
7.1 Magnetic properties
The specified maximum value of coercivity shall be as given in Table 2 where the
availability of grades is indicated.

– 10 – 60404-8-10 © IEC:2009
Table 2 – Coercivity and availability of grades
Maximum value of Pure iron, Ferritic stainless Free machining
a
coercivity alloyed steel, steel ferritic stainless
Grade
b
non-alloyed steel steel
A/m
R40  40 X
R60  60 X
R80  80 X X
R120 120 X
R160 160 X X
R240 240 X X X
R320 320  X
a
Ferritic stainless steels correspond to grades D31-01, D31-03 and D31-05 according to IEC 60404-1.
b
Free machining ferritic stainless steels correspond to grades D31-02, D31-04 and D31-06 according to
IEC 60404-1.
If characteristics in the aged state are necessary, they shall be the subject of prior
agreement between the manufacturer and the purchaser together with the conditions of the
ageing treatment.
7.2 Geometric characteristics and tolerances
7.2.1 Thickness of flat products
The tolerances on thickness for hot-rolled flat products shall be as given in Table 3 for strip
and sheet and in Table 4 for plates.
Table 3 – Tolerances on thickness for hot-rolled strip and sheet
Tolerances, in mm, for a nominal width, in mm, of:
Nominal thickness
≥ 600 > 1 200 > 1 500 > 1 800
mm
≤ 1 200 ≤ 1 500 ≤ 1 800
≤ 2,00 ± 0,17 ± 0,19 ± 0,21 –
> 2,00 ≤ 2,50 ± 0,18 ± 0,21 ± 0,23 ± 0,25
> 2,50 ≤ 3,00 ± 0,20 ± 0,22 ± 0,24 ± 0,26
> 3,00 ≤ 4,00 ± 0,22 ± 0,24 ± 0,26 ± 0,27
> 4,00 ≤ 5,00 ± 0,24 ± 0,26 ± 0,28 ± 0,29
> 5,00 ≤ 6,00 ± 0,26 ± 0,28 ± 0,29 ± 0,31
> 6,00 ≤ 8,00 ± 0,29 ± 0,30 ± 0,31 ± 0,35
> 8,00 ≤ 10,00 ± 0,32 ± 0,33 ± 0,34 ± 0,40
> 10,00 ≤ 12,50 ± 0,35 ± 0,36 ± 0,37 ± 0,43
> 12,50 ≤ 15,00 ± 0,37 ± 0,38 ± 0,40 ± 0,46
> 15,00 ≤ 25,00 ± 0,40 ± 0,42 ± 0,45 ± 0,50
NOTE The specified tolerances are in accordance with EN 10051:1997, category A.

60404-8-10 © IEC:2009 – 11 –
Table 4 – Tolerances on thickness for hot-rolled plate
Nominal Tolerances on Maximum thickness difference, in mm, within a plate
thickness the nominal for a nominal plate width, in mm, of:
thickness
≥ 600 > 2 000 > 2 500 > 3 000 > 3 500 > 4 000
mm mm
≤ 2 000 ≤ 2 500 ≤ 3 000 ≤ 3 500 ≤ 4 000
≥ 3  < 5 ± 0,6 0,8 0,9 0,9 – – –
≥ 5  < 8 ± 0,75 0,9 0,9 1,0 1,0 – –
0,9 1,0 1,0 1,1 1,1 1,2
≥ 8  < 15 ± 0,85
1,0 1,1 1,2 1,2 1,3 1,4
≥ 15 < 25 ± 0,95
1,1 1,2 1,2 1,3 1,3 1,4
≥ 25 < 40 ± 1,1
≥ 40 < 80 ± 1,2 1,2 1,3 1,4 1,4 1,5 1,6
≥ 80 < 150 ± 1,6 1,3 1,4 1,5 1,5 1,6 1,7
≥ 150 ≤ 200 ± 1,8 1,4 1,5 1,6 1,6 1,7 –
NOTE The specified tolerances are in accordance with EN 10029:1991.

The tolerances on thickness for cold-rolled flat products shall be as given in Table 5.
Table 5 – Tolerances on thickness for cold-rolled flat products
Normal tolerances, in mm, for Special tolerances, in mm, for
Nominal nominal width, in mm, of: nominal width, in mm, of:
thickness
≤ 1 200 > 1 200 > 1 500 ≤ 1 200 > 1 200 > 1 500
mm
≤ 1 500  ≤ 1 500
–
≥ 0,35 ≤ 0,40 ± 0,04 ± 0,05 ± 0,06 ± 0,025 ± 0,030
> 0,40 ≤ 0,60 ± 0,04 ± 0,05 ± 0,06 ± 0,030 ± 0,035 ± 0,05
> 0,60 ≤ 0,80 ± 0,05 ± 0,06 ± 0,07 ± 0,035 ± 0,040 ± 0,05
> 0,80 ≤ 1,00 ± 0,06 ± 0,07 ± 0,08 ± 0,040 ± 0,06 ± 0,06
> 1,00 ≤ 1,20 ± 0,07 ± 0,08 ± 0,10 ± 0,050 ± 0,07 ± 0,07
> 1,20 ≤ 1,60 ± 0,09 ± 0,11 ± 0,12 ± 0,060 ± 0,08 ± 0,08
> 1,60 ≤ 2,00 ± 0,12 ± 0,13 ± 0,14 ± 0,070 ± 0,09 ± 0,09
> 2,00 ≤ 2,50 ± 0,14 ± 0,15 ± 0,16 ± 0,100 ± 0,11 ± 0,11
> 2,50 ≤ 3,00 ± 0,17 ± 0,18 ± 0,18 ± 0,120 ± 0,12 ± 0,12
NOTE The specified tolerances are in accordance with the requirements of EN 10131:2006 for
steels with specified yield strength 260 MPa ≤ R < 340 MPa.
e
The tolerances on thickness for hot-rolled flats shall be as given in Table 6.
Table 6 – Tolerances on thickness for hot-rolled flats
Nominal thickness Tolerance
mm mm
≤ 20 ± 0,5
> 20 ≤ 40 ± 1
> 40 ± 1,5
NOTE The specified tolerances are in accordance with EN 10058:2003.

– 12 – 60404-8-10 © IEC:2009
7.2.2 Diameter or side dimension of long products
The tolerances on diameter for hot-rolled rounds shall be as given in Table 7.
Table 7 – Tolerances on diameter for hot-rolled rounds
Nominal diameter Tolerance
mm mm
≥ 8 ≤ 15 ± 0,4
> 15 ≤ 25 ± 0,5
> 25 ≤ 35 ± 0,6
> 35 ≤ 50 ± 0,8
> 50 ≤ 80 ± 1
> 80 ≤ 100 ± 1,3
> 100 ≤ 120 ± 1,5
> 120 ≤ 160 ± 2
> 160 ≤ 200 ± 2,5
NOTE The specified tolerances are in accordance with EN 10060:2003.

The tolerances on side dimension for hot-rolled squares shall be as given in Table 8.
Table 8 – Tolerances on side dimension for hot-rolled squares
Nominal side dimension Tolerance
mm mm
≥ 8 ≤ 14 ± 0,4
> 14 ≤ 25 ± 0,5
> 25 ≤ 35 ± 0,6
> 35 ≤ 50 ± 0,8
> 50 ≤ 80 ± 1
> 80 ≤ 100 ± 1,3
NOTE The specified tolerances are in accordance with EN 10059:2003.

Tolerances of type h 11 of ISO 286-1 shall be applicable for cold-drawn bars.
The tolerances on the dimension of wire rod shall be as given in Table 9.
Table 9 – Tolerances on the dimension of wire rod
Nominal dimension Tolerance
mm mm
≤ 15 ± 0,4
> 15 ≤ 35 ± 0,5
NOTE The specified tolerances are in accordance with ISO 16124:2004.

The tolerances on the diameter of wire shall be as given in Table 10.

60404-8-10 © IEC:2009 – 13 –
Table 10 – Tolerances on the diameter of wire
Nominal diameter Tolerance
mm mm
≤ 1,6 ± 0,02
> 1,6 ≤ 2,4 ± 0,03
> 2,4 ≤ 3,5 ± 0,04
7.2.3 Width of flat products
The tolerances on width for hot-rolled flat products shall be as given in Table 11 for strip and
sheet and in Table 12 for plate.
Table 11 – Tolerances on width for hot-rolled strip and sheet
Tolerances
Nominal width
mm
mm
Mill edges Trimmed edges
≤ 1 500
+ 20 + 3
0 0
> 1 500
+ 25 + 6
0 0
NOTE The specified tolerances are in accordance with EN 10051:1997.

Table 12 – Tolerances on width for hot-rolled plate
a
Nominal width Tolerance
mm mm
≥ 600 ≤ 2 000
+ 20
> 2 000 ≤ 3 000
+ 25
> 3 000
+ 30
a
Tolerances on width for plates with untrimmed edges shall be the subject
of agreement between the manufacturer and the purchaser.
NOTE The specified tolerances are in accordance with EN 10029:1991.

The tolerances on width for cold-rolled flat products shall be as given in Table 13 for products
in the as-rolled condition.
– 14 – 60404-8-10 © IEC:2009
Table 13 – Tolerances on width for cold-rolled flat products
Nominal width Normal tolerance Special tolerance
mm mm mm
≤ 1 200
+ 4 + 2
0 0
>1 200 ≤ 1 500
+ 5 + 2
0 0
> 1 500
+ 6 + 3
0 0
NOTE The specified tolerances are in accordance with EN 10131:2006.

The tolerances on width for narrow strip slit from cold-rolled flat product shall be the subject
of agreement between the manufacturer and purchaser.
The tolerances on width for hot-rolled flats shall be as given in Table 14.
Table 14 – Tolerances on width for hot-rolled flats
Nominal width Tolerance
mm mm
≥ 10 ≤ 40 ± 0,75
> 40 ≤ 80 ± 1
> 80 ≤ 100 ± 1,5
> 100 ≤ 120 ± 2,0
> 120 ≤ 150 ± 2,5
NOTE The specified tolerances are in accordance with EN 10058:2003.

7.2.4 Flatness (wave factor) of flat products
The tolerances on flatness shall be as given in Table 15 for hot-rolled strip and sheet, in
Table 16 for hot-rolled plate and in Table 17 for cold-rolled flat products.
Table 15 – Tolerances on flatness for hot-rolled strip and sheet
Nominal thickness Nominal width Tolerance on flatness
mm mm mm
≤ 2,00 ≤ 1 200
> 1 200 ≤ 1 500 20
> 1 500 25
> 2,00 ≤ 25,00 ≤ 1 200
> 1 200 ≤ 1 500
> 1 500
NOTE The specified tolerances are in accordance with EN 10051:1997.

60404-8-10 © IEC:2009 – 15 –
Table 16 – Tolerances on flatness for hot-rolled plate
Tolerance on flatness, in mm, for
Nominal thickness
a measuring length, in mm, of:
mm
< 2 000 ≥ 2 000
9 14
≥ 3 < 5
≥ 5 < 8 8 12
≥ 8 < 15 7 11
7 10
≥ 15 < 25
6  9
≥ 25 < 40
5  8
≥ 40 ≤ 200
NOTE The specified tolerances are in accordance with EN 10029:1991.

Table 17 – Tolerances on flatness for cold-rolled flat products
Tolerance on flatness, in mm, for
Nominal width
a nominal thickness, in mm, of:
mm
< 0,7 ≥ 0,7 < 1,2 ≥ 1,2
≥ 600 < 1 200 13 10 8
≥ 1 200 < 1 500 15 13 11
20 19 17
≥ 1 500
NOTE The specified tolerances are in accordance with the normal
tolerances specified in EN 10131:2006 for steels with specified yield
strength 260 MPa ≤ R < 340 MPa.
e
7.2.5 Length
The tolerances on length shall be as given in Table 18 for hot-rolled sheet, in Table 19 for
hot-rolled plate and in Table 20 for cold-rolled flat products.
Table 18 – Tolerances on length for hot-rolled sheet
Nominal length, L Tolerance
mm mm
< 2 000
+ 10
≥ 2 000 < 8 000
+ 0,005 L
≥ 8 000
+ 40
NOTE The specified tolerances are in accordance with EN 10051:1997.

– 16 – 60404-8-10 © IEC:2009
Table 19 – Tolerances on length for hot-rolled plate
Nominal length Tolerance
mm mm
< 4 000
+ 20
≥ 4 000 < 6 000
+ 30
≥ 6 000 < 8 000
+ 40
≥ 8 000 < 10 000
+ 50
≥ 10 000 < 15 000
+ 75
≥ 15 000 ≤ 20 000
+ 100
NOTE The specified tolerances are in accordance with EN 10029:1991.

Table 20 – Tolerances on length for cold-rolled flat products
Nominal length, L Tolerance
mm mm
< 2 000
+ 6
≥ 2 000
+ 0,003 L
NOTE The specified tolerances are in accordance with EN 10131:2006.

The tolerance on length for hot-rolled flats and bars and cold-drawn bars shall be ± 100 mm.
7.2.6 Edge camber for flat products
The edge camber for hot-rolled strip and sheet shall not exceed 0,5 % of the actual length of
the sheet for a nominal length < 5 m or for a 2 m length of strip.
The edge camber for hot-rolled plates shall not exceed 0,2 % of the actual length.
The edge camber for cold-rolled flat products shall not exceed 6 mm over a length of 2 m. For
lengths < 2 m, the edge camber shall not exceed 0,3 % of the actual length.
For products with a width less than 80 mm, the edge camber shall not exceed 8 mm over a
length of 2 m.
7.2.7 Straightness of hot-rolled flats and bars
The tolerance on straightness shall be as given in Table 21 for hot-rolled flats and Table 22
for hot-rolled rounds and squares.

60404-8-10 © IEC:2009 – 17 –
Table 21 – Tolerances on straightness for hot-rolled flats
Nominal cross-section Tolerance
mm² mm
< 1 000  0,004 L
≥ 1 000 0,0025 L
L length of the flat
NOTE The specified tolerances are in accordance with EN 10058:2003.

Table 22 – Tolerances on straightness for hot-rolled rounds and squares
Nominal cross-section Tolerance
mm² mm
≥ 1 600 ≤ 6 400  0,004 L
0,0025 L
> 6 400
L length of the round or square
NOTE The specified tolerances are in accordance with EN 10060:2003.

8 Inspection
8.1 General
The materials specified by this standard are generally ordered with inspection in accordance
with ISO 404. The purchaser shall specify when ordering, the properties for which the
verification shall be made, the type of inspection and the related inspection document (see
ISO 10474).
In the case of an order without inspection, as a dispensation from ISO 404, the producer shall
supply a certificate giving the maximum coercivity of the delivered material.
Each acceptance unit shall comprise 1 t or the remaining fraction thereof of the same grade
and the same nominal dimensions. Different acceptance units can be adopted by special
agreement.
For coils of mass greater than 1 t, each coil shall constitute an acceptance unit.
When the products are delivered in the form of slit coils, the test results applying to the parent
unit of acceptance shall apply.
Except by special agreement, the same rules apply to the inspection of the characteristics
which are to be specifically verified.
8.2 Selection of samples
8.2.1 General
One sample for acceptance inspection shall be taken from each acceptance unit. The same
sample shall serve to check the various properties by choosing a suitable order for the
execution of the tests.
8.2.2 Flat products
In the case of coil, the first internal turn and last external turn of the coil shall be considered
as wrapping and not as representative of the quality of the rest of the coil. The selection shall

– 18 – 60404-8-10 © IEC:2009
be made from the first internal or external turns, excluding the wrapping turn. The selection
shall be made away from weld zones or interleaves.
In the case of sheet or plate, the sample shall be taken from the upper part of the bundle.
8.2.3 Long products
The sample shall be taken from the bundle.
8.2.4 Wire rod and wire
The sampling shall be carried out at the end of the coil.
8.3 Preparation of test specimens
8.3.1 Coercivity
The test specimens shall be as specified in IEC 60404-7 depending on the type of product.
Before the determination of the coercivity, the test specimens for all types of delivery
condition and state, except for the fully-processed state, shall be subjected to the following
reference heat treatment. Test specimens for fully-processed material shall not be given a
heat treatment.
The test specimens shall be maintained at a temperature of (790 ± 10) °C for 2 h. The heating
rate shall not exceed 200 °C/h and the cooling rate shall not exceed 120 °C/h down to 550 °C.
Pure iron, non-alloyed and alloyed steel shall be heat treated in a decarburizing atmosphere.
The gas necessary for decarburization shall consist of a 20 % H and 80 % N mixture, with
2 2
water vapour, the dew-point being (20 ± 2) °C at atmospheric pressure.
Ferritic stainless steels shall be heat treated in a neutral atmosphere such as nitrogen or
argon gas or in a reducing atmosphere such as dry hydrogen gas.
Other reference heat treatments may be specified by agreement between the manufacturer
and the purchaser.
The establishment of the decarburizing atmosphere requires the removal of air from the
annealing furnace before raising the temperature. This removal is effected by continuously
purging the furnace with an inert protective gas. The flow and pressure of the decarburizing
gas shall be regulated to ensure good decarburization at any point on the test specimen and a
complete renewal of the atmosphere in the furnace several times during the heat treatment.
It is desirable that the test specimens do not have any contact with each other.
8.3.2 Geometrical characteristics and tolerances
For the measurement of the dimensions of the products, of the flatness and edge camber of
flat products, of the straightness of long products, of the dimensions of wire rods and wires,
the test specimen shall consist of a sheet or plate, a 2 m length of strip, bar or wire.
8.4 Test methods
8.4.1 General
For each specified property, one test shall be carried out per acceptance unit. Unless
otherwise specified, the test shall be made at a temperature of (23 ± 5) °C.

60404-8-10 © IEC:2009 – 19 –
8.4.2 Coercivity
The test shall be made in accordance with IEC 60404-7.
8.4.3 Thickness of flat products
The measurement of thickness shall be made at any point located more than 40 mm from the
edges. For materials of width less than 80 mm, the measurement of thickness shall be made
along the longitudinal axis of the strip.
The measurement shall be made using a micrometer accurate to 0,001 mm.
8.4.4 Width of flat products
The width shall be measured perpendicularly to the longitudinal axis of the strip.
8.4.5 Flatness (wave factor) of flat products
The flatness (wave factor) of flat products shall be measured in accordance with IEC 60404-9.
8.4.6 Edge camber of flat products
The edge camber shall be determined in accordance with IEC 60404-9.
8.4.7 Dimensions of long products
The dimensions of the long products shall be determined as the mean of readings at any two
points measured with an accuracy of 0,1 mm.
8.4.8 Straightness of long products
The straightness is characterized by the greatest distance between the bar and the line
joining the two ends of the bar.
8.4.9 Retest
When a test does not give the specified result, this test shall be repeated on double the
number of test specimens from other samples of the acceptance unit. All these additional
tests shall give satisfactory results; in this case, the delivery shall be considered to conform to
the order.
After retreatment, the producer has the right to present again for test acceptance, those units
which had not been found to comply with the order.
9 Complaints
Internal or external defects shall justify a complaint only if they are clearly detrimental to the
method of working or the judicious use of the material.
The terms and conditions of complaints shall be in accordance with ISO 404.
10 Ordering information
For material to comply adequately with the requirements of this standard, the purchaser shall
include the following information in his enquiry and order:
a) the nature of the product and the designation of the material in accordance with Clause 5;

– 20 – 60404-8-10 © IEC:2009
b) the quantity required including any limitations on the mass of coils (see 6.2);
c) the inspection procedure required including the nature of the related document (see 8.1);
d) the type of tolerances when necessary (see 7.2);
e) the following additional requirements which shall be specified by the purcha
...