IEC 60404-8-5:2020

IEC 60404-8-5 ®
Edition 2.1 2026-06
INTERNATIONAL
STANDARD
CONSOLIDATED VERSION
Magnetic materials -
Part 8-5: Specifications for individual materials - Electrical steel strip and sheet
with specified mechanical properties and magnetic polarization
ICS 29.030; 17.220.20 ISBN 978-2-8327-1367-9
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CONTENTS
FOREWORD . 3
INTRODUCTION . 5
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
6.3 Delivery condition . 8
6.4 Surface condition . 9
6.5 Suitability for cutting . 9
6.6 Suitability for welding . 9
7 Technical requirements . 9
7.1 Mechanical properties . 9
7.2 Magnetic polarization . 9
7.3 Geometrical characteristics and tolerances . 11
7.3.1 Thickness . 11
7.3.2 Width . 13
7.3.3 Length . 13
7.3.4 Edge wave (wave factor) . 14
7.3.5 Residual curvature . 14
7.3.6 Edge camber . 15
7.4 Technological characteristics . 15
7.4.1 Density . 15
8 Inspection and testing. 15
8.1 General . 15
8.2 Selection of test samples . 16
8.3 Preparation of test specimens . 16
8.3.1 Mechanical properties . 16
8.3.2 Magnetic polarization . 16
8.3.3 Geometrical characteristics and tolerances . 17
8.4 Test methods . 17
8.4.1 General . 17
8.4.2 Mechanical properties . 17
8.4.3 Magnetic polarization . 17
8.4.4 Geometrical characteristics and tolerances . 17
8.5 Retests . 18
9 Marking, labelling and packaging . 18
10 Complaints . 18
11 Information to be supplied by the purchaser . 18
Annex A (informative) Number of test strips for magnetic property testing . 19

Table 1 – Mechanical and magnetic characteristics for hot-rolled grades . 10
Table 2 – Mechanical and magnetic characteristics for cold-rolled grades . 11
Table 3 – Tolerance on nominal thickness for hot-rolled grades . 12
Table 4 – Tolerance on nominal thickness for cold-rolled grades . 12
Table 5 – Maximum difference in thickness in a direction perpendicular to the direction
of rolling for hot-rolled grades . 12
Table 6 – Maximum difference in thickness in a direction perpendicular to the direction
of rolling for cold-rolled grades . 13
Table 7 – Tolerance on nominal width of products supplied with trimmed edges . 13
Table 8 – Tolerance on nominal length of sheets . 14
Table 9 – Maximum distance between the lower face of a test specimen and the flat

surface table for hot-rolled grades . 14
Table 10 – Maximum distance between the lower face of a test specimen and the flat
surface table for cold-rolled grades . 15
Table 11 – Minimum number of Epstein test strips . 16
Table A.1 – Number of test strips for magnetic property testing . 19

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Magnetic materials -
Part 8-5: Specifications for individual materials -
Electrical steel strip and sheet with specified properties
and magnetic polarization
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
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This consolidated version of the official IEC Standard and its amendment has been prepared
for user convenience.
IEC 60404-8-5 edition 2.1 contains the second edition (2020-08) [documents 68/648/CDV and
68/662/RVC] and its amendment 1 (2026-06) [documents 68/794/CDV and 68/804/RVC].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions are in green text, deletions are in strikethrough red text.
A separate Final version with all changes accepted is available in this publication.

International Standard IEC 60404-8-5 has been prepared by IEC technical committee 68:
Magnetic alloys and steels.
This second edition cancels and replaces the first edition published in 1989. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) extension of the range of products to include the improved grades;
b) division of "flatness" into "edge wave (wave factor)" and "residual curvature" in consistent
with IEC 60404-9;
c) change length of test specimen for determinations of geometrical characters from 2 m to
1 m.
The text of this International Standard is based on the following documents:
CDV Report on voting
68/648/CDV 68/662/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 document and its amendment will remain
unchanged until the stability date indicated on the IEC website under webstore.iec.ch in the
data related to the specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION
The first edition of IEC 60404-8-5, "Magnetic materials – Part 8: Specifications for individual
materials – Section Five – Specification for steel sheet and strip with specified mechanical
properties and magnetic permeability", was published in April 1989 and has not been revised
for more than 30 years. Since then, new grades of cold-rolled material of minimum proof
strength R greater than 400 MPa were developed and widely used. Thus, IEC TC 68
p0,2
decided in 2017 at their meeting in Paris to revise this document. This revision also includes
corrections to the first edition in order to improve consistency with the other parts of the
IEC 60404-8 subseries.
1 Scope
This part of IEC 60404 defines the grades of electrical steel strip and sheet with specified
mechanical properties and magnetic polarization. In particular, it gives general requirements,
mechanical properties, magnetic polarization, geometric characteristics, tolerances and
technological characteristics, as well as inspection procedures.
This document applies to electrical steel strip and sheet intended for the construction of poles
and rims of rotating electrical machines.
The grades are grouped into two classes according to their manufacturing process:
– hot-rolled grades;
– cold-rolled grades.
They correspond to Class D21 of IEC 60404-1.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 60050-121, International Electrotechnical Vocabulary – Part 121: Electromagnetism
IEC 60050-221, International Electrotechnical Vocabulary – Chapter 221: Magnetic materials
and components
IEC 60404-1, Magnetic materials – Part 1: Classification
IEC 60404-2, Magnetic materials – Part 2: Methods of measurement of the magnetic
properties of electrical steel strip and sheet by means of an Epstein frame
IEC 60404-4, Magnetic materials – Part 4: Methods of measurement of d.c. magnetic
properties of iron and steel
IEC 60404-9, Magnetic materials – Part 9: Methods of determination of the geometrical
characteristics of electrical steel strip and sheet
ISO 404, Steel and steel products – General technical delivery requirements
ISO 2566-1, Steel – Conversion of elongation values – Part 1: Carbon and low alloy steels
ISO 6892-1, Metallic materials – Tensile testing – Part 1: Method of test at room temperature
ISO 10474, Steel and steel products – Inspection documents
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-121,
IEC 60050-221, IEC 60404-9 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
edge wave
wave factor
variations of flatness of a length of strip or a sheet taking a form of waves at the slit edge of
the product
Note 1 to entry: Edge wave is characterized by the wave factor which is the relation of the height of the wave to
its length, expressed as a percentage.
[SOURCE: IEC 60404-9: 2018, 3.1]
3.2
residual curvature
variations of flatness of a length of strip or a sheet taking a permanent curvature in the rolling
direction of the product
[SOURCE: IEC 60404-9: 2018, 3.2]
3.3
edge camber
greatest distance between a longitudinal edge of a length of strip or a sheet and the line
joining the two extremities of the measured length of this edge
[SOURCE: IEC 60404-9: 2018, 3.3]
4 Classification
The grades covered by this document are classified according to the specified value of
minimum proof strength R , in MPa , according to the specified value of minimum magnetic
p0,2
polarization at a DC magnetic field strength of 15 000 A/m, in T, and according to the nominal
thickness of the product , in mm.
5 Designation
The steel name comprises the following in the order given:
a) the characteristic letters
– "TG" for hot-rolled grades;
– "TF" for cold-rolled grades;
b) the specified value of minimum proof strength Rp0,2, in MPa;
c) one hundred times the nominal thickness of the product, in mm;
d) one hundred times the specified value of minimum magnetic polarization at a DC magnetic
field strength of 15 000 A/m, in T.
___________
1 MPa =1 N/mm .
In the rest of the document, the word "product" is used to mean "strip and sheet".
EXAMPLE: TF350-100-181 for cold-rolled electrical steel strip and sheet with a minimum proof strength R of
p0,2
350 MPa, a nominal thickness of 1,0 mm, and a minimum magnetic polarization of 1,81 T at a DC magnetic field
strength of 15 000 A/m.
6 General requirements
6.1 Production process
The production process of the steel and its chemical composition are left to the discretion of
the manufacturer.
6.2 Form of supply
The product is supplied in coils in the case of strip and in bundles in the case of sheets.
The mass of the coils or bundles of sheets shall be agreed between the manufacturer and the
purchaser at the time of enquiry and order.
The internal diameter of coils shall be agreed between the manufacturer and the purchaser at
the time of enquiry and order. The recommended value for the internal diameter of coils is
approximately 610 mm for hot-rolled grades, and approximately 508 mm for cold-rolled grades.
Strip shall be of constant width and wound in such a manner that the edges are superimposed
in a regular manner and the side faces of the coil are substantially flat.
Coils shall be sufficiently tightly wound in order that they do not collapse under their own
weight.
Strip may exhibit welds or interleaves resulting from the removal of defective zones or from
the joining of several lengths to obtain the sizes of the coils required by the purchaser, if
agreed between the manufacturer and the purchaser at the time of enquiry and order. If
necessary, the marking of welds or interleaves may be agreed between the manufacturer and
the purchaser at the time of enquiry and order.
For coils containing repair welds or interleaves, each part of the strip shall be of the same
grade.
The edges of parts welded together shall not be so much out of alignment as to affect the
further processing of the product.
Sheets which make up each bundle shall be stacked so that the side faces are substantially
flat and approximately perpendicular to the top face.
Products supplied in sheets shall not contain any welds.
6.3 Delivery condition
The product is normally supplied without insulation. By agreement between the manufacturer
and the purchaser at the time of enquiry and order, the product may be supplied with
insulation on one or both sides. If the product is supplied with insulation, the nature of the
insulation, its properties and their verification shall be agreed between the manufacturer and
the purchaser at the time of enquiry and order.
Hot-rolled grades are normally supplied with an oxide scale layer unless they have been
ordered pickled.
The product may be supplied lightly coated with oil by agreement between the manufacturer
and the purchaser at the time of enquiry and order.
Coils supplied with trimmed edges and sheets shall not contain excessive burrs or cutting
distortions which are prejudicial to the method of working of the product.
6.4 Surface condition
The surfaces shall be smooth and clean, free from grease and rust . Dispersed defects such
as scratches, blisters, cracks, etc. are only permitted if they are within the limits of the
tolerances on thickness and if they are not detrimental to the correct use of the supplied
product.
6.5 Suitability for cutting
The product shall be able to be cut or punched without causing premature wear of tools. The
product shall be suitable for cutting or punching accurately into the usual shapes at any point
when appropriate cutting or punching tools and technologies are used.
A special requirement concerning suitability for cutting or punching of the product may be
specified by agreement between the manufacturer and the purchaser at the time of enquiry
and order.
6.6 Suitability for welding
A special requirement concerning suitability for welding of the product may be specified by
agreement between the manufacturer and the purchaser at the time of enquiry and order.
7 Technical requirements
7.1 Mechanical properties
The specified values of minimum proof strength R , minimum tensile strength R and
p0,2
m
minimum percentage elongation after fracture A shall be as given in Table 1 and Table 2.
7.2 Magnetic polarization
The specific values of minimum magnetic polarization at DC magnetic field strengths of
5 000 A/m and 15 000 A/m shall be as given in Table 1 and Table 2.
The values of peak magnetic polarization at AC magnetic field strengths of 5 000 A/m and
15 000 A/m (expressed as peak values) and at frequencies of 50 Hz or 60 Hz may be used
instead, provided the specified values of minimum magnetic polarization given in Table 1 and
Table 2 are satisfied.
Other values at a magnetic field strength lower than 15 000 A/m may be specified by
agreement between the manufacturer and the purchaser at the time of enquiry and order,
instead of the values at a magnetic field strength of 15 000 A/m.
___________
This should not be confused with some coloration of the insulation coating inherent to the manufacturing
process.
Table 1 – Mechanical and magnetic characteristics for hot-rolled grades
a
Steel name Minimum Minimum Minimum percentage Minimum magnetic
c
proof tensile elongation after fracture for polarization at a DC
strength strength an original gauge length L magnetic field strength
R R A J
p0,2 m
MPa MPa % T
d
L = 80 mm L = 5,65 √S 5 000 A/m 15 000 A/m
0 0 0
b
TG250-.-180 250 350 22 26 1,60 1,80
TG300-.-180 300 400 20 24 1,60 1,80
TG350-.-179 350 450 18 22 1,55 1,79
TG400-.-179 400 500 16 19 1,55 1,79
TG450-.-179 450 550 14 17 1,54 1,79
TG500-.-179 500 600 12 14 1,53 1,79
TG550-.-178 550 650 12 14 1,52 1,78
TG600-.-178 600 700 10 12 1,50 1,78
TG650-.-178 650 750 10 12 1,48 1,78
TG700-.-178 700 800 10 12 1,46 1,78
a
is one hundred times the nominal thickness of the product, in millimetres. Other steel names may be agreed
between the manufacturer and the purchaser at the time of enquiry and order.
b
These values shall be obtained on a tensile test specimen of type 2, L = 80 mm, for products with thickness
less than 3 mm and on a proportional test specimen, L = 5,65√S , for products with thickness equal to or
0 0
greater than 3 mm, the values may be converted each other in accordance with ISO 2566-1. Where L is the
original gauge length marked on the test specimen, in mm, and S0 is the original cross-sectional area of the
test specimen, in mm (See 8.3.1).
c
It has been common practice for many years to give values of magnetic flux density. In fact the Epstein frame
is used to determine magnetic polarization (intrinsic flux density) which is defined as follows in accordance
with IEC 60050-121:
J = B – μ H
where
J is the magnetic polarization;
B is the magnetic flux density;
−7 −1
µ is the magnetic constant: 4 π × 10 H·m ;
H is the magnetic field strength.
d
Other values at a magnetic field strength lower than 15 000 A/m may be agreed between the manufacturer
and the purchaser at the time of enquiry and order, instead of the values at a magnetic field strength of
15 000 A/m.
Table 2 – Mechanical and magnetic characteristics for cold-rolled grades
Minimum magnetic
Minimum percentage b
polarization at a DC magnetic
Minimum Minimum elongation after
field strength
Steel name a proof tensile fracture for an
strength strength original gauge length J
L = 80 mm
T
R R A
p0,2 m
c
5 000 A/m 15 000 A/m
MPa MPa %
TF250-.-183 250 325 16 1,6 1,83
TF300-.-182 300 375 15 1,55 1,82
TF350-.-181 350 425 13 1,52 1,81
TF400-.-180 400 450 10 1,5 1,8
TF450-.-179 450 550 10 1,48 1,79
TF500-.-178 500 600 10 1,46 1,78
a
is one hundred times the nominal thickness of the product, in millimetres. Other steel names may be agreed
between the manufacturer and the purchaser at the time of enquiry and order.
b
It has been common practice for many years to give values of magnetic flux density. In fact the Epstein
frame is used to determine magnetic polarization (intrinsic flux density) which is defined as follows in
accordance with IEC 60050-121:
J = B − μ H
where
J is the magnetic polarization;
B is the magnetic flux density;
−7 −1
µ is the magnetic constant: 4 π × 10 H·m ;
H is the magnetic field strength.
c
Other values at a magnetic field strength lower than 15 000 A/m may be agreed between the manufacturer
and the purchaser at the time of enquiry and order, instead of the values at a magnetic field strength of
15 000 A/m.
7.3 Geometrical characteristics and tolerances
7.3.1 Thickness
The nominal thicknesses of the product are the following:
– hot-rolled grades: 1,6 mm, 1,8 mm, 2,0 mm, 2,5 mm, 3,0 mm, 3,2 mm an d 4,5 mm;
– cold-rolled grades: 0,5 mm, 1,0 mm, 1,6 mm, 1,8 mm and 2,0 mm.
For thickness tolerance, a distinction is made between:
– the deviation from the nominal thickness within an acceptance unit;
– the difference in thickness in a length of strip or sheet in a direction parallel to the
direction of rolling;
– the difference in thickness in a direction perpendicular to the direction of rolling. This
tolerance applies only to products with a width greater than 150 mm.
At any point, the deviation from the nominal thickness within an acceptance unit shall not
exceed the tolerances of Table 3 and Table 4 corresponding to hot-rolled grades and cold-
rolled grades respectively.
Table 3 – Tolerance on nominal thickness for hot-rolled grades
Tolerance on nominal thickness t (mm)
Proof strength Nominal width
R w mm
p0,2
MPa mm 1,5 < t ≤ 2 2 < t ≤ 2,5 2,5 < t ≤ 3 3 < t ≤ 4 4 < t ≤ 5
w ≤ 600 ±0,16 ±0,17 ±0,17 ±0,17 ±0,18
R ≤ 300 600 < w ≤ 1 200 ±0,18 ±0,20 ±0,21 ±0,23 ±0,27
p0,2
w > 1 200 ±0,20 ±0,22 ±0,23 ±0,25 ±0,28
w ≤ 600 ±0,18 ±0,19 ±0,19 ±0,19 ±0,20
300 < R ≤ 400 600 < w ≤ 1 200 ±0,23 ±0,25 ±0,26 ±0,29 ±0,34
p0,2
w > 1 200 ±0,25 ±0,28 ±0,29 ±0,31 ±0,35
w ≤ 600 ±0,22 ±0,24 ±0,24 ±0,24 ±0,24
R > 400 600 < w ≤ 1 200 ±0,29 ±0,31 ±0,32 ±0,36 ±0,43
p0,2
w > 1 200 ±0,31 ±0,35 ±0,36 ±0,39 ±0,44

Table 4 – Tolerance on nominal thickness for cold-rolled grades
Nominal width Tolerance on nominal thickness t (mm)
W mm
mm 0,4< t ≤ 0,6 0,6< t ≤0,8 0,8< t ≤1 1< t ≤1,2 1,2< t ≤1,5 1,5< t ≤ 2 2< t ≤2,5 2,5< t ≤3
w ≤ 600 ±0,04 ±0,05 ±0,05 ±0,07 ±0,07 ±0,08 ±0,08 ±0,10
600 < w ≤ 1 200 ±0,08 ±0,09 ±0,10 ±0,12 ±0,14 ±0,16 ±0,18 ±0,20
w > 1 200 ±0,09 ±0,10 ±0,11 ±0,13 ±0,15 ±0,17 ±0,20 ±0,23

The difference in thickness in a 1 m length of strip or sheet in a direction parallel to the
direction of rolling shall not exceed:
– 8 % of the nominal thickness t for t ≤ 1,5 mm;
– 5 % of the nominal thickness t for t > 1,5 mm.
The difference in thickness in a direction perpendicular to the direction of rolling shall not
exceed the values given in Table 5 and Table 6 corresponding to hot-rolled grades and cold-
rolled grades respectively.
Table 5 – Maximum difference in thickness in a direction perpendicular
to the direction of rolling for hot-rolled grades
Maximum difference in thickness in a direction perpendicular to the
Proof strength
direction of rolling for nom i na l width w (mm)
R mm
p0,2
MPa 150 ≤ w ≤ 600 600 < w ≤ 1 200 w > 1 200
R ≤ 450 0,06 0,08 0,10
p0,2
R > 450 0,12 0,14 0,16
p0,2
Table 6 – Maximum difference in thickness in a direction perpendicular
to the direction of rolling for cold-rolled grades
Nominal Maximum difference in thickness in a direction perpendicular
Proof strength
thickness to the direction of rolling for nom i na l width w (mm)
R t
p0,2
mm
MPa mm
150 ≤ w ≤ 600 600 < w ≤ 1 200 w > 1 200
t ≤ 0,7 0,03 0,04 0,05
R ≤ 350
p0,2
t > 0,7 0,04 0,05 0,06
t ≤ 0,7 0,04 0,05 0,06
R > 350
p0,2
t > 0,7 0,06 0,07 0,08
7.3.2 Width
The commonly available nominal widths are less than or equal to 1 500 mm.
For products supplied with trimmed edges, the tolerances of Table 7 shall apply.
Table 7 – Tolerance on nominal width of products supplied with trimmed edges
a
Nominal width Tolerance
w
mm
mm
Cold-rolled grades for nominal thickness t (mm)
Hot-rolled
grades
t ≤ 1,5 1,5 < t ≤ 2,5 2,5 < t ≤ 3
+ 0,6 + 0,4 + 0,5 + 0,7
w ≤ 50
0 0 0 0
+ 0,6 + 0,4 + 0,6 + 0,9
50 < w ≤ 100
0 0 0 0
+ 1,0 + 0,5 + 0,7 + 1,0
100 < w ≤ 200
0 0 0 0
+1,4 + 0,6 + 0,9 + 1,2
200 < w ≤ 400
0 0 0 0
+ 1,8 + 1,0 + 1,0 + 1,2
400 < w ≤ 600
0 0 0 0
+ 6,0 + 5,0 + 5,0 + 5,0
600 < w ≤ 1 200
0 0 0 0
+ 8,0 + 7,0 + 7,0 + 7,0
w > 1 200
0 0 0 0
a
By agreement between the manufacturer and the purchaser at the time of enquiry and order, the tolerance on
the nominal width can be all negative tolerances.

For products supplied with as-rolled edges, the tolerances on the geometric characteristics
shall be subject to agreement between the manufacturer and the purchaser at the time of
enquiry and order.
7.3.3 Length
The verification of length does not apply to the products supplied in coils.
For products supplied in sheets, the tolerances of Table 8 shall apply.
Table 8 – Tolerance on nominal length of sheets
Nominal length l
Tolerance
mm mm
+10
l ≤ 1 000
+(1 % of l)
l > 1 000
7.3.4 Edge wave (wave factor)
The verification of edge wave does not apply to products of width less than or equal to
100 mm, of thickness greater than 1 mm and products supplied with as-rolled edges.
For products supplied in coils, the wave factor shall not exceed 2 %.
A special requirement concerning edge wave (wave factor) may be specified by agreement
between the manufacturer and the purchaser at the time of enquiry and order of products
supplied in coils.
A height of edge wave may be specified by agreement between the manufacturer and the
purchasers at the time of enquiry and order of products, instead of the wave factor.
7.3.5 Residual curvature
The verification of residual curvature does not apply to the products supplied in coils.
For products supplied in sheets, the maximum distance between the lower face of the test
specimen and the flat surface table shall not exceed the values given in Table 9 and Table 10
corresponding to hot-rolled grades and cold-rolled grades respectively.
A special requirement concerning residual curvature may be specified by agreement between
the manufacturer and the purchaser at the time of enquiry and order of products of width
greater than 100 mm.
Table 9 – Maximum distance between the lower face of a test
specimen and the flat surface table for hot-rolled grades
Maximum distance between the lower face of the test specimen
Proof strength
and the flat surface table for nominal thickness t (mm)
R mm
p0,2
MPa
t ≤ 2 t > 2
R ≤ 350 6 5
p0,2
350 < R ≤ 500 7 6
p0,2
R > 500 8 7
p0,2
Table 10 – Maximum distance between the lower face of a test specimen and the flat
surface table for cold-rolled grades
Maximum distance between the lower face of the test specimen
Proof strength
and the flat surface table for nominal thickness t (mm)
R mm
p0,2
MPa
t ≤ 0,7 0,7 < t ≤ 1,2 t > 1,2
250 10 9 8
300 10 9 8
350 15 12 8
400 15 12 8
For products supplied in sheet of a specified length, the maximum distance between the lower
face of the sheet and the flat surface table may be specified by agreement between the
manufacturer and the purchaser at the time of enquiry and order.
7.3.6 Edge camber
The verification of edge camber does not apply to products of width less than or equal to
150 mm and products supplied with as-rolled edges.
The edge camber shall not exceed 5 mm.
7.4 Technological characteristics
7.4.1 Density
The density of the product is not specified.
The conventional value of density used to calculate the magnetic polarization shall be
7,85 kg/dm .
Other values may be agreed between the manufacturer and the purchaser at the time of
enquiry and order.
8 Inspection and testing
8.1 General
The products defined by this document can be ordered with or without sp e ci f i c inspection
in accordance with ISO 404. However, as a dispensation from ISO 404, in the case of an
order without specific inspection, the manufacturer shall supply an inspection document type
3.1 according to ISO 10474 giving the proof strength Rp0,2 and the magnetic polarization of the
supplied product.
In the case of an order with specific inspection, the type of inspection document in
accordance with ISO 10474 shall be specified when ordering. In this case, the delivery
is divided into acceptance units.
The acceptance units shall be adopted by special agreement between the manufacturer and
the purchaser at the time of enquiry and order.
Except by special agreement, the same rules apply to the inspection of suitability of cutting,
suitability of welding and tolerances on geometrical characteristics.
When the products are delivered in the form of slit coils, the test results applying to the parent
coil of the acceptance unit shall apply.
8.2 Selection of test samples
Test samples shall be taken from each acceptance unit.
The first internal turn and the last external turn of a coil shall be considered as wrapping and
not as representative of the quality of the rest of the coil. The selection shall be made from
the first internal or external turns, excluding the wrapping turn and outside any welding zones
or interleaves.
In the case of sheets, the selection shall be made preferably from the upper part of the bundle.
By choosing a suitable order for the execution of the tests, the same sample shall serve to
verify the various properties.
8.3 Preparation of test specimens
8.3.1 Mechanical properties
For the determination of mechanical properties, the type of test specimen shall be in
accordance with ISO 6892-1:
– a tensile test specimen of type 2 (L = 80 mm) for products with a no mi na l thickness
less than 3 mm;
– a proportional test specimen (L = 5,65√S ) with a rectangular cross-section for
0 0
products with a nominal thickness equal to or greater than 3 mm.
The test specimen shall be cut perpendicular to the direction of rolling within a tolerance of
±5°. If the width of the product is insufficient for the sample to be taken across the width, the
test specimen shall be taken parallel to the direction of rolling.
8.3.2 Magnetic polarization
For the measurement of magnetic polarization, the type of test specimen is a function of the
test method used.
For products with the nominal thickness greater than 2 mm, the test method and the test
specimen may be specified by agreement between the manufacturer and the purchaser at the
enquiry and order.
For products with the nominal thickness less than or equal to 2 mm, the test specimen shall
consist of Epstein test strips for the 25 cm Epstein frame in accordance with IEC 60404-2, the
test specimen shall have a minimum active mass of 240 g for strips of 280 mm long. The
minimum number of Epstein test strips is given in Table 11, or the number of test strips
related to the steel strip or sheet thickness may be as defined in Annex A.
Table 11 – Minimum number of Epstein test strips
Minimum number of
Nominal thickness t
Epstein test strips
mm
t ≤ 1,0 16
1,0 < t ≤ 1,6 12
1,6 < t ≤ 2,0 8
The Epstein test strips shall have the following dimensions:
– length 280 mm to 320 mm, the lengths being equal within a tolerance of ±0,5 mm;
– width 30 mm within a tolerance of ±0,2 mm.
Half the test strips shall be cut parallel to the direction of rolling and the other half of test
strips shall be cut perpendicular to the direction of rolling, giving an even distribution across
the width of the product. The test strips shall be carefully cut without deformation. Cutting or
punching shall be carried out only with well-sharpened tools. The permitted tolerance of the
angle between the direction of cutting and the specified direction is ±5°.
If the width of the product is insufficient for a sampling of test strips to be taken across the
width, the test strips shall be taken parallel to the direction of rolling only.
For the measurement using one of the test methods specified in IEC 60404-4, the type of test
specimen, which is a function of the test method used, shall be in accordance with
IEC 60404-4.
8.3.3 Geometrical characteristics and tolerances
For the measurement of thickness, width, edge wave (wave factor), residual curvature and
edge camber, the test specimen shall consist of a 1 m length of strip or sheet.
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 an ambient temperature of 23 °C ± 5 °C.
8.4.2 Mechanical properties
The proof strength R , the tensile strength R and the percentage elongation after fracture
p0,2 m
A shall be determined in accordance with ISO 6892-1.
8.4.3 Magnetic polarization
The magnetic polarization shall be determined either by means of a 25 cm Epstein frame in
accordance with IEC 60404-2 or by means of one of the test methods specified in
IEC 60404-4.
8.4.4 Geometrical characteristics and tolerances
8.4.4.1 Thickness
The measurement of thickness shall be made at any point located at least 20 mm from the
edges. For products of a width less than 40 mm, the measurement of thickness shall be made
along the longitudinal axis (rolling direction) of the product. This measurement shall be made
using a micrometer with an uncertainty of 0,002 mm or better.
8.4.4.2 Width
The width shall be measured perpendicular to the longitudinal axis (rolling direction) of the
product with a calibrated measuring instrument.
8.4.4.3 Edge wave (wave factor)
The wave factor shall be determined in accordance with IEC 60404-9.
8.4.4.4 Residual curvature
The residual curvature in the longitudinal axis (rolling direction) of the sheet shall be
determined with the horizontal method in accordance with IEC 60404-9.
8.4.4.5 Edge camber
The edge camber shall be determined in accordance with IEC 60404-9.
8.5 Retests
When a test does not give the specified result, the test shall be repeated on double the
number of test specimens from other sheets of the acceptance unit or on other str
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