Grain-oriented electrical steel strip and sheet delivered in the fully processed state

This document defines the steel grades of grain-oriented electrical steel strip and sheet in nominal thicknesses of 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular, it gives general requirements, magnetic properties, geometric characteristics, tolerances and technological characteristics, as well as inspection procedures.
This document applies to Goss textured grain-oriented electrical steel strip and sheet supplied in the final annealed condition in coils or sheets and intended for the construction of magnetic circuits.
The grades are grouped into three classes:
-   conventional grades;
-   high permeability grades;
-   magnetic domain refined high permeability grades.
They correspond to Class C22 of IEC 60404-1.

Kornorientiertes Elektroband und -blech im schlussgeglühten Zustand

Dieses Dokument legt die Stahlsorten für kornorientiertes Elektroband und -blech in Nenndicken 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm und 0,35 mm fest und im Besonderen allgemeine Anforderungen, magnetische Eigenschaften, geometrische Eigenschaften und Grenzabmaße, technologische Eigenschaften sowie Prüfbedingungen.
Diese Europäische Norm gilt für kornorientiertes Elektroband und -blech mit Goss-Textur, das im schlussgeglühten Zustand in Form von Tafeln oder Rollen geliefert wird und für den Bau magnetischer Kreise bestimmt ist.
Die Erzeugnisse sind in drei Klassen unterteilt:
a)   konventionelle kornorientierte Erzeugnisse;
b)   kornorientierte Erzeugnisse mit hoher Permeabilität;
c)   domainverfeinerte (gelaserte) Erzeugnisse mit hoher Permeabilität.
Diese entsprechen IEC 60404-1:2000, Abschnitt C.22.

Bandes et tôles en acier électrique à grains orientés livrées à l'état fini

Le présent document définit les nuances d’acier des bandes et tôles en acier électriques à grains orientés d'épaisseurs nominales 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm et 0,35 mm. Il donne notamment les exigences générales, les caractéristiques magnétiques, les caractéristiques géométriques, les tolérances et les caractéristiques technologiques, ainsi que les modalités de contrôle.
Le présent document s’applique aux bandes et tôles en acier électrique à grains orientés, à texture de Goss, livrées à l’état de recuit final en couronnes ou en feuilles et destinées à la construction de circuits magnétiques.
Les nuances sont groupées en trois classes :
-   nuances conventionnelles ;
-   nuances à haute perméabilité ;
-   nuances à haute perméabilité avec affinement des domaines magnétiques
Elles correspondent à la classe C.22 de l’IEC 60404-1.

Orientirana elektropločevina in trakovi, dobavljeni v končnem žarjenem stanju

General Information

Status
Published
Public Enquiry End Date
22-Sep-2021
Publication Date
19-Sep-2022
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Sep-2022
Due Date
21-Nov-2022
Completion Date
20-Sep-2022

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SLOVENSKI STANDARD
SIST EN 10107:2022
01-november-2022
Nadomešča:
SIST EN 10107:2014
Orientirana elektropločevina in trakovi, dobavljeni v končnem žarjenem stanju

Grain-oriented electrical steel strip and sheet delivered in the fully processed state

Kornorientiertes Elektroband und -blech im schlussgeglühten Zustand
Bandes et tôles en acier électrique à grains orientés livrées à l'état fini
Ta slovenski standard je istoveten z: EN 10107:2022
ICS:
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
SIST EN 10107:2022 en,fr,de

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

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SIST EN 10107:2022
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SIST EN 10107:2022
EN 10107
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2022
EUROPÄISCHE NORM
ICS 77.140.50 Supersedes EN 10107:2014
English Version
Grain-oriented electrical steel strip and sheet delivered in
the fully processed state

Bandes et tôles en acier électrique à grains orientés Kornorientiertes Elektroband und -blech im

livrées à l'état fini schlussgeglühten Zustand
This European Standard was approved by CEN on 24 July 2022.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10107:2022 E

worldwide for CEN national Members.
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SIST EN 10107:2022
EN 10107:2022 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Classification and designation .................................................................................................................... 7

4.1 Classification ....................................................................................................................................................... 7

4.2 Designation .......................................................................................................................................................... 7

5 Information to be supplied by the purchaser ....................................................................................... 7

5.1 General ................................................................................................................................................................... 7

5.2 Mandatory information .................................................................................................................................. 7

5.3 Options ................................................................................................................................................................... 8

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

6.1 Production process ........................................................................................................................................... 8

6.2 Form of supply .................................................................................................................................................... 8

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

6.4 Surface condition ............................................................................................................................................... 9

6.5 Suitability for cutting ....................................................................................................................................... 9

7 Technical requirements................................................................................................................................ 9

7.1 Magnetic properties ......................................................................................................................................... 9

7.2 Geometric characteristics and tolerances ............................................................................................ 12

7.3 Technological characteristics .................................................................................................................... 14

8 Inspection and testing ................................................................................................................................ 15

8.1 General ................................................................................................................................................................ 15

8.2 Sampling ............................................................................................................................................................. 15

8.3 Preparation of test specimens .................................................................................................................. 15

8.4 Test methods .................................................................................................................................................... 17

8.5 Retests ................................................................................................................................................................. 18

9 Marking, labelling and packaging .......................................................................................................... 18

10 Complaints ...................................................................................................................................................... 18

Annex A (informative) Maximum specific total loss at 60 Hz and 1,7 T ................................................ 19

Bibliography ................................................................................................................................................................. 21

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SIST EN 10107:2022
EN 10107:2022 (E)
European foreword

This document (EN 10107:2022) has been prepared by Technical Committee CEN/TC 459 “ECISS –

European Committee for Iron and Steel Standardization” , the secretariat of which is held by AFNOR.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by March 2023, and conflicting national standards shall

be withdrawn at the latest by March 2023.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document supersedes EN 10107:2014.

This edition includes the following significant technical changes with respect to the previous edition:

— insertion of a third class of electrical steels for magnetic domain refined high permeability grades;

— introduction of the Single Sheet Testing (SST) method as reference measurement method for this

third class of material together with a conversion factor for transposition of the SST measurement

results to the Epstein measurement results;

— update of the electrical steel range to take account of the current offers and demands of grades.

Any feedback and questions on this document should be directed to the users’ national standards body.

A complete listing of these bodies can be found on the CEN website.

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and the

United Kingdom.

Through its sub-committee SC 8 “Steel sheet and strip for electrical applications” (secretariat: DIN).

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SIST EN 10107:2022
EN 10107:2022 (E)
Introduction

The insertion of a third class of electrical steels for magnetic domain refined high permeability grades is

the main reason of this revision. Most of the technologies of magnetic domain refinement result in

material that does not withstand the stress relief annealing after cutting without changing the magnetic

properties (i.e. the specific total loss). In the case of this material, the Epstein method according to

EN 60404-2, requiring the annealing of the Epstein strip samples, is not suitable. Therefore, the Single

Sheet Tester (SST) method specified in IEC 60404-3 is employed.

The introduction of the SST as the reference measurement method for these magnetic domain refined

high permeability grades was preceded by intense discussions within IEC/TC 68.

The specific total loss measured by use of the SST specified in IEC 60404-3 tends to be larger than the

value measured by the use of Epstein frame in accordance with EN 60404-2. The magnetic polarization

at H = 800 A/m measured by use of the SST tends to be a little lower than the value measured by the use

of Epstein frame.

The significant difference between Epstein and SST loss results made it necessary to introduce a

Conversion Factor, F , applied to the SST results. This Conversion Factor is to create continuity in the

quality characteristics ratio of conventional grain-oriented electrical steel grades and of high

permeability grades (Epstein related loss values) to the magnetic domain refined high permeability

grades (SST related loss values), particularly over the transition zone between these grades. Otherwise,

it might be confusing to the users of this specification standard that the higher quality materials

measured by the SST method are listed with seemingly higher values of the specific total loss, compared

with the lower Epstein values measured on the lower quality grades.

Considerations of the widely spread grades of grain-oriented electrical steel led to the consented value

of F = 0,925 to be applied to the loss values at 1,7 T measured by the SST method.

The magnetic polarization for H = 800 A/m is the value taken from the SST measurement without

conversion to an equivalent Epstein value.

Consequently, the magnetic domain refined high permeability grades have been listed in a new

Table 3 as a new class of grain-oriented electrical steel strip and sheet.
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SIST EN 10107:2022
EN 10107:2022 (E)
1 Scope

This document defines the steel grades of grain-oriented electrical steel strip and sheet in nominal

thicknesses of 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular, it gives general

requirements, magnetic properties, geometric characteristics, tolerances and technological

characteristics, as well as inspection procedures.

This document applies to Goss textured grain-oriented electrical steel strip and sheet supplied in the

final annealed condition in coils or sheets and intended for the construction of magnetic circuits.

The grades are grouped into three classes:
— conventional grades;
— high permeability grades;
— magnetic domain refined high permeability grades.
They correspond to Class C22 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.

EN 10021, General technical delivery conditions for steel products
EN 10204, Metallic products - Types of inspection documents

EN 10251, Magnetic materials - Methods of determination of the geometrical characteristics of electrical

steel sheet and strip

EN 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

EN IEC 60404-11, Magnetic materials - Part 11: Methods of measurement of the surface insulation

resistance of electrical steel strip and sheet

EN IEC 60404-13, Magnetic materials - Part 13: Methods of measurement of resistivity, density and

stacking factor of electrical steel strip and sheet

EN ISO 7799, Metallic materials - Sheet and strip 3 mm thick or less - Reverse bend test (ISO 7799)

IEC 60050-121, International electrotechnical vocabulary — Part 121: Electromagnetism

IEC 60050-221, International electrotechnical vocabulary — Part 221: Magnetic materials and

components

IEC 60404-3, Magnetic materials — Part 3: Methods of measurement of the magnetic properties of

electrical steel strip and sheet by means of a single sheet tester
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SIST EN 10107:2022
EN 10107:2022 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-121 and

IEC 60050-221 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
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
3.2
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: The 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]
3.3
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]
3.4
number of bends

counts of alternate bending in the reverse bend test prior to the appearance of the first crack in the base

metal of the specimen visible to the naked eye or prior to when sudden failure occurs by fracture

[SOURCE: IEC/TR 63114:2018, 3.2]
3.5
deviation from the shearing line
internal stress

greatest distance between corresponding points on the two sheared edges of a length of strip or a sheet

sheared in the middle of the width, in parallel to the rolling direction of the product, which

characterizes the internal stress of the materials
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SIST EN 10107:2022
EN 10107:2022 (E)
4 Classification and designation
4.1 Classification

The steel grades covered by this this document are classified according to the value of maximum

specific total loss in watts per kilogram and according to the nominal thickness of the product

(0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm).
4.2 Designation
The steel name comprises the following in the order given:
a) the letter M for electrical steel;

b) one hundred times the specified value of maximum specific total loss at 1,7 T and 50 Hz, in watts

per kilogram;
c) one hundred times the nominal thickness of the product, in millimetres;
d) the characteristic letter:
— S for conventional grades;
— P for high permeability grades;
— R for magnetic domain refined high permeability grades.

EXAMPLE M120-30S for conventional grain-oriented electrical steel strip or sheet with a maximum specific

total loss of 1,20 W/kg at 1,7 T and 50 Hz, and a nominal thickness of 0,30 mm, supplied in the fully processed

state.
5 Information to be supplied by the purchaser
5.1 General

For material to comply adequately with the requirements of this document, the purchaser shall include

the following information in his enquiry and order:
5.2 Mandatory information
a) the quantity;
b) the type of product: strip or sheet;
c) the number of this document, i.e. EN 10107;
d) the steel name or number (see 4.2);

e) the dimensions of sheets or strips required, including any limitations on the external diameter of a

coil (see 6.2 and 7.2.2);
f) any limitations on the mass of a coil or a bundle of sheets (see 6.2);

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

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SIST EN 10107:2022
EN 10107:2022 (E)

g) the inspection procedure required including the nature of the related documents (see 8.1);

h) whether or not the product can be delivered in a magnetic domain refined state by any technology

(heatproof or non-heatproof).
5.3 Options

A number of options are specified in this document and listed below. If the purchaser does not indicate

this wish to implement one of these options, the products shall be supplied in accordance with the basis

specification of this document (see 5.1):
1) permissibility of welds and its marking (see 6.2);
2) compatibility between fluid and coating (see 6.4);
3) plus tolerances for nominal width (see Table 3, footnote a);
4) requirement concerning residual curvature (see 7.2.6);
5) requirement concerning the minimum insulation coating resistance (see 7.3.5);
6) acceptance unit other than 3 t (see 8.1);
7) test temperature other than (23 ± 5) °C (see 8.4.1);
8) alternative method for determination of magnetic properties (see 8.4.2);
9) marking of the products (see Clause 9).
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 shall be 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 recommended value for the internal diameter of coils is approximately 508 mm.

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 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.
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SIST EN 10107:2022
EN 10107:2022 (E)

Sheets which make up each bundle shall be stacked so that the side faces are substantially flat and

approximately perpendicular to the top face.
6.3 Delivery condition

Cold-rolled grain-oriented electrical steel products are usually supplied with an insulating coating on

both sides. This coating generally consists of an EC-5-G coating on an EC-2 coating in accordance with

EN 10342. Other types of coating exist which are used only when particularly specified.

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.

The insulation coating present on the surface of the product shall be sufficiently adherent so that it does

not become detached during core manufacturing operations or heat treatment under conditions

specified by the supplier.

If the product is to be immersed in a fluid, an agreement between the manufacturer and the purchaser,

initiated by the purchaser, should be reached to ensure compatibility between the fluid and the coating.

6.5 Suitability for cutting

The product shall be suitable for cutting accurately into the usual shapes at any point when appropriate

cutting tools are used.
7 Technical requirements
7.1 Magnetic properties
7.1.1 General

The properties defined in 7.1.2 and 7.1.3 shall apply to products in the delivery condition defined in 6.3

and to the aged condition defined in 8.3.1.1 and 8.3.1.2.

The Epstein strips shall receive a stress relief heat treatment after cutting under conditions specified by

the manufacturer.
The single sheet test specimens shall not be heat treated.
7.1.2 Magnetic polarization

The specified minimum values of peak magnetic polarization at the peak magnetic field strength of

800 A/m at 50 Hz shall be as given in Tables 1 to 3.
7.1.3 Specific total loss

The specified values of maximum specific total loss at 50 Hz shall be as given in Tables 1 to 3.

7.1.4 Magnetic properties of magnetic domain refined grades

The magnetic properties are measured in accordance with the SST method of IEC 60404-3.

Not to be confused with some coloration of the insulating coating inherent to the manufacturing process.

The specific total loss measured by use of the SST specified in IEC 60404-3 tends to be larger than the value

measured by the use of Epstein frame in accordance with EN 60404-2. The magnetic polarization at H=800 A/m

measured by use of the SST tends to be a little lower than the value measured by the use of Epstein frame.

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SIST EN 10107:2022
EN 10107:2022 (E)

In Table 1 when the material is delivered in the domain refined condition and in Table 3, the specific

total loss at 1,7 T is treated on the basis of an equivalent Epstein value obtained by multiplying the SST

measurement result at 1,7 T and 50 Hz by a factor of conversion, F , equal to 0,925.

The factor of conversion, F , for non-specific values, e. g. at 1,5 T, may be subject to agreement between

the manufacturer and the purchaser at the time of enquiry and order.

In Table 3, the magnetic polarization for H = 800 A/m is measured in accordance with the SST method

without conversion to an equivalent Epstein value.

Annex A gives, for guidance, the maximum specific total loss at 60 Hz for a magnetic polarization of

1,7 T (see Tables A.1 to A.3).

Table 1 — Technological and magnetic properties of the conventional grades of grain-oriented

electrical steel strip and sheet (magnetic properties are measured in accordance with the

Epstein method EN 60404-2)
Maximum Maximum specific Minimum
magnetic
specific total total loss at 1,7 T Minimum
Nominal
polarization for
Steel grade loss at 1,5 T stacking
thickness
factor
W/kg W/kg
H = 800 A/m
Steel name Steel number mm 50 Hz 50 Hz T
M100-23S 1.9851 — 1,00 1,80
M110-23S 1.0863 0,23 0,73 1,10 1,78 0,945
M120-23S 1.0864 0,77 1,20 1,78
M105-27S 1.9852 — 1,05 1,80
M110-27S 1.9853 0,77 1,10 1,80
0,27 0,950
M120-27S 1.0868 0,80 1,20 1,78
M130-27S 1.0866 0,85 1,30 1,78
M110-30S 1.9857 — 1,10 1,80
M120-30S 1.9858 0,83 1,20 1,80
M130-30S 1.0859 0,30 0,85 1,30 1,78 0,955
M140-30S 1.0862 0,92 1,40 1,78
M150-30S 1.0861 0,97 1,50 1,75
M135-35S 1.9854 0,97 1,35 1,80
M145-35S 1.9855 1,03 1,45 1,78
0,35 0,960
M155-35S 1.9856 1,07 1,55 1,78
M165-35S 1.0856 1,11 1,65 1,75

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:
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 x 10 H·m ;

H is the magnetic field strength. The difference between B and J at 800 A/m is equal to 0,001 T.

These grades may be delivered in the domain refined condition. In this case, refer to 8.4.2. The conversion factor, Fc,

should be agreed between the manufacturer and the purchaser at the time of enquiry and order.

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SIST EN 10107:2022
EN 10107:2022 (E)

Table 2 — Technological and magnetic properties of the high permeability grades of grain-

oriented electrical steel strip and sheet (magnetic properties are measured in accordance with

the Epstein method EN 60404-2)
Maximum specific Minimum
total loss magnetic
Nominal Minimum stacking
Steel grade
at 1,7 T polarization for
thickness factor
W/kg
H = 800 A/m
Steel name Steel number mm 50 Hz T
M85-23P 1.0822 0,85 1,88
M90-23P 1.0835 0,90 1,87
0,23 0,945
M95-23P 1.0836 0,95 1,87
M100-23P 1.0879 1,00 1,85
M90-27P 1.0838 0,90 1,88
M95-27P 1.0839 0,95 1,88
0,27 0,950
M100-27P 1.9840 1,00 1,88
M110-27P 1.9841 1,10 1,88
M95-30P 1.9885 0,95 1,88
M100-30P 1.0852 1,00 1,88
M105-30P 1.0886 0,30 1,05 1,88 0,955
M110-30P 1.9887 1,10 1,88
M120-30P 1.9888 1,20 1,85
M115-35P 1.0855 1,15 1,88
M125-35P 1.0854 0,35 1,25 1,88 0,960
M135-35P 1.9889 1,35 1,88

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:
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 x 10 H·m ;
H is the magnetic field strength.
The difference between B and J at 800 A/m is equal to 0,001 T.
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SIST EN 10107:2022
EN 10107:2022 (E)

Table 3 — Technological and magnetic properties of magnetic domain refined high permeability

grades of grain-oriented electrical steel strip and sheet (magnetic properties are measured in

accordance with the Single Sheet Test method IEC 60404-3)
Maximum specific Minimum magnetic
total loss polarization for
Nominal Minimum
Steel grade at 1,7 T
H = 800 A/m
thickness stacking factor
W/kg
Steel name Steel number mm 50 Hz T
M65-20R 1.9860 0,65 1,85
M70-20R 1.9861 0,70 1,85
0,20 0,940
M75-20R 1.9862 0,75 1,85
M70-23R 1.9859 0,70 1,85
M75-23R 1.9863 0,75 1,85
M80-23R 1.9864 0,80 1,85
0,23 0,945
M85-23R 1.9865 0,85 1,85
M90-23R 1.9866 0,90 1,85
M85-27R 1.9867 0,85 1,85
M90-27R 1.9868 0,27 0,90 1,85 0,950
M95-27R 1.9869 0,95 1,85

It has been common practice for many years to give values of magnetic flux density (B) instead of values of magnetic

polarization (intrinsic flux density) which is defined as:
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 x 10 H·m ;
H is the magnetic field strength.
The difference between B and J at 800 A/m is equal to 0,001 T.
7.2 Geometric characteristics and tolerances
7.2.1 Thickness

The nominal thicknesses of the product are 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm.

For thickness tolerance, a distinction is made between:

a) the allowable tolerance on the nominal thickness within the same acceptance unit;

b) the difference in thickness in a sheet or in a length of strip in a direction parallel to the direction of

rolling;

c) 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 allowable deviation from the nominal thickness within the same acceptance unit shall

not exceed the tolerances of Table 4. The
...

SLOVENSKI STANDARD
oSIST prEN 10107:2021
01-september-2021
Orientirana elektropločevina in trakovi, dobavljeni v končnem žarjenem stanju

Grain-oriented electrical steel strip and sheet delivered in the fully processed state

Kornorientiertes Elektroband und -blech im schlussgeglühten Zustand
Bandes et tôles en acier électrique à grains orientés livrées à l'état fini
Ta slovenski standard je istoveten z: prEN 10107
ICS:
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
oSIST prEN 10107:2021 en,fr,de

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

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oSIST prEN 10107:2021
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oSIST prEN 10107:2021
DRAFT
EUROPEAN STANDARD
prEN 10107
NORME EUROPÉENNE
EUROPÄISCHE NORM
July 2021
ICS 77.140.50 Will supersede EN 10107:2014
English Version
Grain-oriented electrical steel strip and sheet delivered in
the fully processed state

Bandes et tôles en acier électrique à grains orientés Kornorientiertes Elektroband und -blech im

livrées à l'état fini schlussgeglühten Zustand

This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee

CEN/TC 459/SC 8.

If this draft becomes a European Standard, CEN members are bound to comply with the CEN/CENELEC Internal Regulations

which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other

language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC

Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without

notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10107:2021 E

worldwide for CEN national Members.
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oSIST prEN 10107:2021
prEN 10107:2021 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

Introduction .................................................................................................................................................................... 4

1 Scope .................................................................................................................................................................... 5

2 Normative references .................................................................................................................................... 5

3 Terms and definitions ................................................................................................................................... 6

4 Classification and designation .................................................................................................................... 7

4.1 Classification ..................................................................................................................................................... 7

4.2 Designation........................................................................................................................................................ 7

5 Information to be supplied by the purchaser ....................................................................................... 7

5.1 General ................................................................................................................................................................ 7

5.2 Mandatory information ................................................................................................................................ 7

5.3 Options ................................................................................................................................................................ 8

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

6.1 Production process ......................................................................................................................................... 8

6.2 Form of supply.................................................................................................................................................. 8

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

6.4 Surface condition ............................................................................................................................................ 9

6.5 Suitability for cutting ..................................................................................................................................... 9

7 Technical requirements................................................................................................................................ 9

7.1 Magnetic properties ....................................................................................................................................... 9

7.2 Geometric characteristics and tolerances .......................................................................................... 13

7.3 Technological characteristics .................................................................................................................. 16

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

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

8.2 Sampling .......................................................................................................................................................... 17

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

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

8.5 Retests .............................................................................................................................................................. 20

9 Marking, labelling and packaging .......................................................................................................... 20

10 Complaints ...................................................................................................................................................... 20

Annex A (informative) Maximum specific total loss at 60 Hz and 1,7 T .................................................. 21

Bibliography ................................................................................................................................................................. 23

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oSIST prEN 10107:2021
prEN 10107:2021 (E)
European foreword

This document (prEN 10107:2021) has been prepared by Technical Committee CEN/TC 459/SC 8 “Steel

sheet and strip for electrical applications”, the secretariat of which is held by DIN.

This document is currently submitted to the CEN Enquiry.
This document will supersede EN 10107:2014.

This edition includes the following significant technical changes with respect to the previous edition:

— insertion of a third class of electrical steels for magnetic domain refined high permeability grades;

— introduction of the Single Sheet Testing (SST) method as reference measurement method for this

third class of material together with a conversion factor for transposition of the SST measurement

results to the Epstein measurement results;

— update of the electrical steel range to take account of the current offers and demands of grades.

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Introduction

The insertion of a third class of electrical steels for magnetic domain refined high permeability grades is

the main reason of this revision. Most of the technologies of magnetic domain refinement result in

material that does not withstand the stress relief annealing after cutting without changing the magnetic

properties (i.e. the specific total loss). In the case of this material, the Epstein method according to

IEC 60404-2, requiring the annealing of the Epstein strip samples, is not suitable. Therefore, the Single

Sheet Tester (SST) method specified in IEC 60404-3 is employed.

The introduction of the SST as the reference measurement method for these magnetic domain refined

high permeability grades was preceded by intense discussions within IEC/TC 68.

The specific total loss measured by use of the SST specified in IEC 60404-3 tends to be larger than the

value measured by the use of Epstein frame in accordance with IEC 60404-2. The magnetic polarization

at H = 800 A/m measured by use of the SST tends to be a little lower than the value measured by the use

of Epstein frame.

The significant difference between Epstein and SST loss results made it necessary to introduce a

Conversion Factor, F , applied to the SST results. This Conversion Factor is to create continuity in the

quality characteristics ratio of conventional grain-oriented electrical steel grades and of high

permeability grades (Epstein related loss values) to the magnetic domain refined high permeability

grades (SST related loss values), particularly over the transition zone between these grades. Otherwise,

it might be confusing to the users of this specification standard that the higher quality materials measured

by the SST method are listed with seemingly higher values of the specific total loss, compared with the

lower Epstein values measured on the lower quality grades.

Considerations of the widely spread grades of grain-oriented electrical steel led to the consented value of

F = 0,925 to be applied to the loss values at 1,7 T measured by the SST method.

The magnetic polarization for H = 800 A/m is the value taken from the SST measurement without

conversion to an equivalent Epstein value.

Consequently, the magnetic domain refined high permeability grades have been listed in a new Table 3 as

a new class of grain-oriented electrical steel strip and sheet.
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oSIST prEN 10107:2021
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1 Scope

This document defines the steel grades of grain-oriented electrical steel strip and sheet in nominal

thicknesses of 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm. In particular, it gives general

requirements, magnetic properties, geometric characteristics, tolerances and technological

characteristics, as well as inspection procedures.

This document applies to Goss textured grain-oriented electrical steel strip and sheet supplied in the final

annealed condition in coils or sheets and intended for the construction of magnetic circuits.

The grades are grouped into three classes:
— conventional grades;
— high permeability grades;
— magnetic domain refined high permeability grades.
They correspond to Class C22 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.

EN 10021, General technical delivery conditions for steel products
EN 10204, Metallic products — Types of inspection documents

EN 10251, Magnetic materials — Methods of determination of the geometrical characteristics of electrical

steel sheet and strip

EN 10342, Magnetic materials — Classification of surface insulations of electrical steel sheet, strip and

laminations

EN ISO 7799, Metallic materials — Sheet and strip 3 mm thick or less — Reverse bend test (ISO 7799)

IEC 60050-121, International electrotechnical vocabulary — Part 121: Electromagnetism

IEC 60050-221, International electrotechnical vocabulary — Part 221: Magnetic materials and

components

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 60404-3, Magnetic materials — Part 3: Methods of measurement of the magnetic properties of

magnetic strip and sheet by means of a single sheet tester

IEC 60404-11, Magnetic materials — Part 11: Method of test for the determination of surface insulation

resistance of magnetic sheet and strip

IEC 60404-13, Magnetic materials — Part 13: Methods of measurement of resistivity, density and stacking

factor of electrical steel strip and sheet
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oSIST prEN 10107:2021
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3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-121 and IEC 60050-221

and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
3.1
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
3.2
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: The 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]
3.3
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]
3.4
number of bends

counts of alternate bending in the reverse bend test prior to the appearance of the first crack in the base

metal of the specimen visible to the naked eye or prior to when sudden failure occurs by fracture

[SOURCE: IEC/TR 63114:2018, 3.2]
3.5
deviation from the shearing line
internal stress

greatest distance between corresponding points on the two sheared edges of a length of strip or a sheet

sheared in the middle of the width, in parallel to the rolling direction of the product, which characterizes

the internal stress of the materials
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4 Classification and designation
4.1 Classification

The steel grades covered by this this document are classified according to the value of maximum specific

total loss in watts per kilogram and according to the nominal thickness of the product (0,20 mm,

0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm).
4.2 Designation
The steel name comprises the following in the order given:
a) the letter M for electrical steel;

b) one hundred times the specified value of maximum specific total loss at 1,7 T and 50 Hz, in watts per

kilogram;
c) one hundred times the nominal thickness of the product, in millimetres;
d) the characteristic letter:
— S for conventional grades;
— P for high permeability grades;
— R for magnetic domain refined high permeability grades.

EXAMPLE M120-30S for conventional grain-oriented electrical steel strip or sheet with a maximum specific

total loss of 1,20 W/kg at 1,7 T and 50 Hz, and a nominal thickness of 0,30 mm, supplied in the fully processed state.

5 Information to be supplied by the purchaser
5.1 General

For material to comply adequately with the requirements of this document, the purchaser shall include

the following information in his enquiry and order:
5.2 Mandatory information
a) The quantity;
b) the type of product: strip or sheet;
c) the number of this document, i.e. EN 10107;
d) the steel name or number (see 4.2);

e) the dimensions of sheets or strips required, including any limitations on the external diameter of a

coil (see 6.2 and 7.2.2);
f) any limitations on the mass of a coil or a bundle of sheets (see 6.2);

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

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g) residual curvature for coils (see 7.2.6);

h) the inspection procedure required including the nature of the related documents (see 8.1);

i) whether or not the product can be delivered in a magnetic domain refined state by any technology

(heatproof or non-heatproof).
5.3 Options

A number of options are specified in this document and listed below. If the purchaser does not indicate

this wish to implement one of these options, the products shall be supplied in accordance with the basis

specification of this document (see 5.1):
1) permissibility of welds and its marking (see 6.2);
2) compatibility between fluid and coating (see 6.4);
3) plus tolerances for nominal width (see Table 3, footnote );
4) requirement concerning residual curvature (see 7.2.6);
5) requirement concerning the minimum insulation coating resistance (see 7.3.5);
6) acceptance unit other than 3 t (see 8.1);
7) test temperature other than (23 ± 5) °C (see 8.4.1);
8) alternative method for determination of magnetic properties (see 8.4.2);
9) marking of the products (see Clause 9).
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 shall be 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 recommended value for the internal diameter of coils is approximately 508 mm.

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 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.

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oSIST prEN 10107:2021
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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.
6.3 Delivery condition

Cold-rolled grain-oriented electrical steel products are usually supplied with an insulating coating on

both sides. This coating generally consists of an EC-5-G coating on an EC-2 coating in accordance with

EN 10342. Other types of coating exist which are used only when particularly specified.

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.

The insulation coating present on the surface of the product shall be sufficiently adherent so that it does

not become detached during core manufacturing operations or heat treatment under conditions specified

by the supplier.

If the product is to be immersed in a fluid, an agreement between the manufacturer and the purchaser,

initiated by the purchaser, should be reached to ensure compatibility between the fluid and the coating.

6.5 Suitability for cutting

The product shall be suitable for cutting accurately into the usual shapes at any point when appropriate

cutting tools are used.
7 Technical requirements
7.1 Magnetic properties
7.1.1 General

The properties defined in 7.1.2 and 7.1.3 shall apply to products in the delivery condition defined in 6.3

and to the aged condition defined in 8.3.1.1 and 8.3.1.2.

The Epstein strips shall receive a stress relief heat treatment after cutting under conditions specified by

the manufacturer.
The single sheet test specimens shall not be heat treated.
7.1.2 Magnetic polarization

The specified minimum values of peak magnetic polarization at the peak magnetic field strength of

800 A/m at 50 Hz shall be as given in Tables 1 to 3.
7.1.3 Specific total loss

The specified values of maximum specific total loss at 50 Hz shall be as given in Tables 1 to 3.

Not to be confused with some coloration of the insulating coating inherent to the manufacturing process.

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7.1.4 Magnetic properties of magnetic domain refined grades

The magnetic properties are measured in accordance with the SST method of IEC 60404-3.

In Table 1 when the material is delivered in the domain refined condition and in Table 3, the specific total

loss at 1,7 T is treated on the basis of an equivalent Epstein value obtained by multiplying the SST

measurement result at 1,7 T and 50Hz by a factor of conversion, F , equal to 0,925.

The factor of conversion, F , for non-specific values, e.g. at 1,5 T, may be subject to agreement between

the manufacturer and the purchaser at the time of enquiry and order.

In Table 3, the magnetic polarization for H = 800 A/m is measured in accordance with the SST method

without conversion to an equivalent Epstein value.

There are technologies of heatproof magnetic domain refinement which result in samples that withstand

the annealing without changing the magnetic properties (i.e. the specific total loss). In that case, the

Epstein method according to IEC 60404-2 shall be used with annealing the Epstein sample set. The

application of the Epstein method is subject to an agreement between the manufacturer and the

purchaser at the time of enquiry and order.

Annex A gives, for guidance, the maximum specific total loss at 60 Hz for a magnetic polarization of 1,7 T

(see Tables A.1 to A.3).

The specific total loss measured by use of the SST specified in IEC 60404-3 tends to be larger than the value measured

by the use of Epstein frame in accordance with IEC 60404-2. The magnetic polarization at H=800 A/m measured by use

of the SST tends to be a little lower than the value measured by the use of Epstein frame.

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Table 1 — Technological and magnetic properties of the conventional grades of grain-oriented

electrical steel strip and sheet (magnetic properties are measured in accordance with the

Epstein method IEC 60404-2)
Maximum Minimum
Maximum specific
specific total magnetic Minimum
Nominal total loss at 1,7 T
loss at 1,5 T polarization for stacking
Steel grade
thickness
factor
H = 800 A/m
W/kg
W/kg
Steel Steel mm 50 Hz 50 Hz T
name number
M100-23S 1.9851 — 1,00 1,80
M110-23S 1.0863 0,23 0,73 1,10 1,78 0,945
M120-23S 1.0864 0,77 1,20 1,78
M105-27S 1.9852 — 1,05 1,80
M110-27S 1.9853 0,77 1,10 1,80
0,27 0,950
M120-27S 1.0868 0,80 1,20 1,78
M130-27S 1.0866 0,85 1,30 1,78
M110-30S 1.9857 — 1,10 1,80
M120-30S 1.9858 0,83 1,20 1,80
M130-30S 1.0859 0,30 0,85 1,30 1,78 0,955
M140-30S 1.0862 0,92 1,40 1,78
M150-30S 1.0861 0,97 1,50 1,75
M135-35S 1.9854 0,97 1,35 1,80
M145-35S 1.9855 1,03 1,45 1,78
0,35 0,960
M155-35S 1.9856 1,07 1,55 1,78
M165-35S 1.0856 1,11 1,65 1,75

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:

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 x 10 H·m ;
H is the magnetic field strength.
The difference between B and J at 800 A/m is equal to 0,001 T.

These grades may be delivered in the domain refined condition. In this case, refer to 8.4.2. The conversion

factor, F , should be agreed between the manufacturer and the purchaser at the time of enquiry and order.

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oSIST prEN 10107:2021
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Table 2 — Technological and magnetic properties of the high permeability grades of grain-

oriented electrical steel strip and sheet (magnetic properties are measured in accordance with

the Epstein method IEC 60404-2)
Maximum specific Minimum
total loss magnetic
Nominal Minimum stacking
Steel grade
at 1,7 T polarization for
thickness factor
W/kg
H = 800 A/m
Steel name Steel mm 50 Hz T
number
M85-23P 1.0822 0,85 1,88
M90-23P 1.0835 0,90 1,87
0,23 0,945
M95-23P 1.0836 0,95 1,87
M100-23P 1.0879 1,00 1,85
M90-27P 1.0838 0,90 1,88
M95-27P 1.0839 0,95 1,88
0,27 0,950
M100-27P 1.9840 1,00 1,88
M110-27P 1.9841 1,10 1,88
M95-30P 1.9885 0,95 1,88
M100-30P 1.0852 1,00 1,88
M105-30P 1.0886 0,30 1,05 1,88 0,955
M110-30P 1.9887 1,10 1,88
M120-30P 1.9888 1,20 1,85
M115-35P 1.0855 1,15 1,88
M125-35P 1.0854 0,35 1,25 1,88 0,960
M135-35P 1.9889 1,35 1,88

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:

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 x 10 H·m ;
H is the magnetic field strength.
The difference between B and J at 800 A/m is equal to 0,001 T.
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Table 3 — Technological and magnetic properties of magnetic domain refined high permeability

grades of grain-oriented electrical steel strip and sheet (magnetic properties are measured in

accordance with the Single Sheet Test method IEC 60404-3)
Maximum specific Minimum magnetic
total loss polarization for
Nominal Minimum stacking
Steel grade at 1,7 T
H = 800 A/m
thickness factor
W/kg
Steel Steel mm 50 Hz T
name number
M70-20R 1.9861 0,70 1,85
0,20 0,940
M75-20R 1.9862 0,75 1,85
M75-23R 1.9863 0,75 1,85
M80-23R 1.9864 0,80 1,85
0,23 0,945
M85-23R 1.9865 0,85 1,85
M90-23R 1.9866 0,90 1,85
M85-27R 1.9867 0,85 1,85
M90-27R 1.9868 0,27 0,90 1,85 0,950
M95-27R 1.9869 0,95 1,85

It has been common practice for many years to give values of magnetic flux density (B) instead of values of

magnetic polarization (intrinsic flux density) which is defined as:
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 x 10 H·m ;
H is the magnetic field strength.
The difference between B and J at 800 A/m is equal to 0,001 T.
7.2 Geometric characteristics and tolerances
7.2.1 Thickness

The nominal thicknesses of the product are 0,20 mm, 0,23 mm, 0,27 mm, 0,30 mm and 0,35 mm.

For thickness tolerance, a distinction is made between

a) the allowable tolerance on the nominal thickness within the same acceptance unit;

b) the difference in thickness in a sheet or in a length of strip in a direction parallel to the direction of

rolling;

c) 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 allowable deviation from the nominal thickness within the same acceptance unit shall

not exceed the tolerances of Table 4. The additional thickness due to welds with respect to the measured

thickness of the steel product shall not exceed 0,050 mm.
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