oSIST prEN 10251:2023

SLOVENSKI STANDARD
oSIST prEN 10251:2023
01-marec-2023
Magnetni materiali - Metode za ugotavljanje geometrijskih lastnosti
elektropločevin in trakov
Magnetic materials - Methods of determination of the geometrical characteristics of
electrical steel sheet and strip
Magnetische Werkstoffe - Verfahren zur Bestimmung der geometrischen Kenngrößen
von Elektroblech und -band
Matériaux magnétiques - Méthodes de détermination des caractéristiques géométrique
des bandes et tôles en acier électrique
Ta slovenski standard je istoveten z: prEN 10251
ICS:
29.030 Magnetni materiali Magnetic materials
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
oSIST prEN 10251:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 10251:2023

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oSIST prEN 10251:2023


DRAFT
EUROPEAN STANDARD
prEN 10251
NORME EUROPÉENNE

EUROPÄISCHE NORM

January 2023
ICS 29.030; 77.140.50 Will supersede EN 10251:2015
English Version

Magnetic materials - Methods of determination of the
geometrical characteristics of electrical steel sheet and
strip
Matériaux magnétiques - Méthodes de détermination Magnetische Werkstoffe - Verfahren zur Bestimmung
des caractéristiques géométrique des bandes et tôles der geometrischen Kenngrößen von Elektroblech und -
en acier électrique band
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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10251:2023 E
worldwide for CEN national Members.

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oSIST prEN 10251:2023
prEN 10251:2023 (E)
Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 4
3 Terms and definitions . 4
4 Test Methods . 5
4.1 Edge wave . 5
4.1.1 Test specimen . 5
4.1.2 Measuring procedure. 5
4.2 Residual curvature . 6
4.2.1 General . 6
4.2.2 Horizontal method . 7
4.2.3 Vertical method. 7
4.3 Edge camber . 8
4.3.1 Test specimen . 8
4.3.2 Measuring procedure. 8
4.4 Deviation from the shearing line due to internal stresses . 9
4.4.1 Test specimen . 9
4.4.2 Measuring procedure. 9
4.5 Burr height . 10
4.5.1 Test specimen . 10
4.5.2 Measuring procedure. 10
5 Test report . 12
Annex A (informative) Examples of clamping systems . 13
Bibliography . 15

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oSIST prEN 10251:2023
prEN 10251:2023 (E)
European foreword
This document (prEN 10251:2023) 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.
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 will supersede EN 10251:2015.
The main changes compared to the previous edition are as follows:
— the definitions have been updated, in particular replacement of “flatness” with “edge wave”;
— the test methods have been amended as follows:
— Edge wave: the requirements for the test specimen and the measuring procedure have been
updated;
— Residual curvature: the horizontal method has been added (the residual curvature can be made
with both a vertical and a horizontal method);
— Edge camber: the requirements for the test specimen and the measuring procedure have been
updated;
— Deviation from the shearing line due to internal stresses: the requirements for the test specimen
and the measuring procedure have been updated;
— Burr height: the requirements for the test specimen and the measuring procedure have been
updated, and the measuring procedure using a hand-held micrometre for the thickness has been
added;
— the test report has updated.
The author thanks the International Electrotechnical Commission (IEC) for permission to reproduce
Information from its International Standards. All such extracts are copyright of IEC, Geneva, Switzerland.
All rights reserved. Further information on the IEC is available from www.iec.ch. IEC has no responsibility
for the placement and context in which the extracts and contents are reproduced by the author, nor is
IEC in any way responsible for the other content or accuracy therein.
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oSIST prEN 10251:2023
prEN 10251:2023 (E)
1 Scope
This document is intended to define the test methods used for the determination of the following
geometrical characteristics of electrical steel sheet and strip:
— edge wave;
— residual curvature;
— edge camber;
— deviation from the shearing line due to internal stresses;
— burr height of cut edges.
This document applies to electrical steel sheet and strip intended for the construction of magnetic circuits
and corresponding to Clauses B2, C21 and C22 of EN 60404-1:2017.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions 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 wave
wave factor
variation of flatness of a length of strip or sheet taking a form of waves at the cut edge of the product;
characterised by the wave factor, i.e. by the relation of the height of the wave to its length
Note 1 to entry: For examples of waves, see Figure 1.
3.2
residual curvature
variations of flatness of a length of unwound strip or a sheet taking a permanent curvature in the direction
of rolling of the product
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
Note 1 to entry: See Figure 5.
[SOURCE: IEC 60404-9:2018, definition 3.3]
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oSIST prEN 10251:2023
prEN 10251:2023 (E)
3.4
deviation from the shearing line
greatest distance between corresponding points on the two cut 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 may
characterise the internal stress of the materials
Note 1 to entry: See Figure 6.
3.5
burr height
difference between the thicknesses of a length of strip or a sheet measured respectively at the cut edge
of the sheet and at a distance of 10 mm from this edge
Note 1 to entry: See Figure 7.
4 Test Methods
4.1 Edge wave
4.1.1 Test specimen
The test specimen shall consist of a sheet or a length of strip, the size of which is defined in the product
standard. If it is not defined in the product standard, the length shall be 1 m. Its width shall be equal to
the delivered width of the product. The axis of the specimen shall be parallel to the rolling direction.
4.1.2 Measuring procedure
The test specimen shall be placed on a flat surface (e.g. a granite, marble, table) which is sufficiently large
so that the test specimen does not overhang the edges (see Figure 1). It shall then be lifted up on one edge
and allowed to fall back. The height of the maximum wave (h) shall be measured by means of an
instrument having a resolution of 0,1 mm or better. The length of the wave (l) shall be measured by means
of an instrument having a resolution of 1 mm or better (see Figure 2). Only complete waves are taken
into account.
The wave factor shall be determined as the ratio of the height of the wave (h) to its length (l), expressed
as a percentage (see Figure 2).
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