Magnetic materials - Part 8-5: Specifications for individual materials - Electrical steel strip and sheet with specified mechanical properties and magnetic polarization

IEC 60404-8-5:2020(E) 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.
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.

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Status
Published
Publication Date
17-Aug-2020
Current Stage
PPUB - Publication issued
Completion Date
18-Aug-2020
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IEC 60404-8-5
Edition 2.0 2020-08
INTERNATIONAL
STANDARD
Magnetic materials –

Part 8-5: Specifications for individual materials – Electrical steel strip and sheet

with specified mechanical properties and magnetic polarization
IEC 60404-8-5:2020-08(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 60404-8-5
Edition 2.0 2020-08
INTERNATIONAL
STANDARD
Magnetic materials –

Part 8-5: Specifications for individual materials – Electrical steel strip and sheet

with specified mechanical properties and magnetic polarization
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 29.030; 17.220.20 ISBN 978-2-8322-8747-7

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC 60404-8-5:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 7

2 Normative references ...................................................................................................... 7

3 Terms and definitions ...................................................................................................... 8

4 Classification ................................................................................................................... 8

5 Designation ..................................................................................................................... 8

6 General requirements ...................................................................................................... 9

6.1 Production process ................................................................................................. 9

6.2 Form of supply ........................................................................................................ 9

6.3 Delivery condition ................................................................................................... 9

6.4 Surface condition .................................................................................................. 10

6.5 Suitability for cutting ............................................................................................. 10

6.6 Suitability for welding ............................................................................................ 10

7 Technical requirements ................................................................................................. 10

7.1 Mechanical properties ........................................................................................... 10

7.2 Magnetic polarization ............................................................................................ 10

7.3 Geometrical characteristics and tolerances ........................................................... 12

7.3.1 Thickness ...................................................................................................... 12

7.3.2 Width ............................................................................................................. 14

7.3.3 Length ........................................................................................................... 14

7.3.4 Edge wave (wave factor) ............................................................................... 15

7.3.5 Residual curvature ......................................................................................... 15

7.3.6 Edge camber ................................................................................................. 16

7.4 Technological characteristics ................................................................................ 16

7.4.1 Density .......................................................................................................... 16

8 Inspection and testing .................................................................................................... 16

8.1 General ................................................................................................................. 16

8.2 Selection of test samples ...................................................................................... 17

8.3 Preparation of test specimens ............................................................................... 17

8.3.1 Mechanical properties .................................................................................... 17

8.3.2 Magnetic polarization ..................................................................................... 17

8.3.3 Geometrical characteristics and tolerances .................................................... 18

8.4 Test methods ........................................................................................................ 18

8.4.1 General ......................................................................................................... 18

8.4.2 Mechanical properties .................................................................................... 18

8.4.3 Magnetic polarization ..................................................................................... 18

8.4.4 Geometrical characteristics and tolerances .................................................... 18

8.5 Retests ................................................................................................................. 19

9 Marking, labelling and packaging ................................................................................... 19

10 Complaints .................................................................................................................... 19

11 Information to be supplied by the purchaser .................................................................. 19

Table 1 – Mechanical and magnetic characteristics for hot-rolled grades .............................. 11

Table 2 – Mechanical and magnetic characteristics for cold-rolled grades ............................. 12

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IEC 60404-8-5:2020 © IEC 2020 – 3 –

Table 3 – Tolerance on nominal thickness for hot-rolled grades ............................................ 13

Table 4 – Tolerance on nominal thickness for cold-rolled grades .......................................... 13

Table 5 – Maximum difference in thickness in a direction perpendicular to the direction

of rolling for hot-rolled grades ............................................................................................... 13

Table 6 – Maximum difference in thickness in a direction perpendicular to the direction

of rolling for cold-rolled grades ............................................................................................. 14

Table 7 – Tolerance on nominal width of products supplied with trimmed edges ................... 14

Table 8 – Tolerance on nominal length of sheets .................................................................. 15

Table 9 – Maximum distance between the lower face of a test specimen and the flat

surface table for hot-rolled grades ........................................................................................ 15

Table 10 – Maximum distance between the lower face of a test specimen and the flat

surface table for cold-rolled grades ....................................................................................... 16

Table 11 – Minimum number of Epstein test strips ................................................................ 17

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– 4 – IEC 60404-8-5:2020 © IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
MAGNETIC MATERIALS –
Part 8-5: Specifications for individual materials –
Electrical steel strip and sheet with specified mechanical
properties and magnetic polarization
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

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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 60404-8-5 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.
---------------------- Page: 6 ----------------------
IEC 60404-8-5:2020 © IEC 2020 – 5 –
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 will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 7 ----------------------
– 6 – IEC 60404-8-5:2020 © IEC 2020
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.
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IEC 60404-8-5:2020 © IEC 2020 – 7 –
MAGNETIC MATERIALS –
Part 8-5: Specifications for individual materials –
Electrical steel strip and sheet with specified mechanical
properties and magnetic polarization
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

---------------------- Page: 9 ----------------------
– 8 – IEC 60404-8-5:2020 © IEC 2020
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;
___________
1 MPa =1 N/mm .

In the rest of the document, the word "product" is used to mean "strip and sheet".

---------------------- Page: 10 ----------------------
IEC 60404-8-5:2020 © IEC 2020 – 9 –
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.

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.
---------------------- Page: 11 ----------------------
– 10 – IEC 60404-8-5:2020 © IEC 2020

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
. Dispersed defects such
The surfaces shall be smooth and clean, free from grease and rust

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 Rp0,2, minimum tensile strength R and

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.
---------------------- Page: 12 ----------------------
IEC 60404-8-5:2020 © IEC 2020 – 11 –
Table 1 – Mechanical and magnetic characteristics for hot-rolled grades
Steel name Minimum Minimum Minimum percentage Minimum magnetic
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
L = 80 mm L = 5,65 √S 5 000 A/m 15 000 A/m
0 0 0
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

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.

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).

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.

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.
---------------------- Page: 13 ----------------------
– 12 – IEC 60404-8-5:2020 © IEC 2020
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
R R A
p0,2 m
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

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.

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.

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.
...

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