prEN 10106

• Abstract:

  This document specifies cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses of 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it specifies general requirements, the magnetic properties, geometric characteristics and tolerances, technological characteristics as well as the inspection procedure.; This document applies to materials supplied in the fully annealed condition intended for the construction of magnetic circuits. It does not apply to semi-processed material.; These magnetic materials correspond to EN 60404-1:2017, Class C.21.

• Status: Not Published
• Publication Date: 12-Mar-2028
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: ECISS/TC 108 - Steel sheet and strip for electrical applications
• Drafting Committee: ECISS/TC 108 - Steel sheet and strip for electrical applications
• Current Stage: 4020 - Submission to enquiry - Enquiry
• Start Date: 18-Jun-2026
• Due Date: 30-Dec-2026
• Completion Date: 18-Jun-2026
• Ref Project: oSIST prEN 10106:2026 - Magnetics materials - Cold rolled non-oriented electrical steel strip and sheet delivered in the fully processed state

• Revises: EN 10106:2015 - Cold rolled non-oriented electrical steel strip and sheet delivered in the fully processed state
• Effective Date: 19-Nov-2025

SLOVENSKI STANDARD
01-september-2026
Magnetni materiali - Hladno valjana neorientirana elektropločevina in trakovi,
dobavljeni v končnem stanju
Magnetics materials - Cold rolled non-oriented electrical steel strip and sheet delivered in
the fully processed state
Magnetische Werkstoffe - Kaltgewalztes nicht kornorientiertes Elektroband und -blech im
schlussgeglühten Zustand
Matériaux magnétiques - Bandes et tôles magnétiques en acier à grains non orientés
laminées à froid et livrées à l'état fini
Ta slovenski standard je istoveten z: prEN 10106
ICS:
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2026
ICS 77.140.50 Will supersede EN 10106:2015
English Version
Magnetics materials - Cold rolled non-oriented electrical
steel strip and sheet delivered in the fully processed state
Matériaux magnétiques - Bandes et tôles magnétiques Magnetische Werkstoffe - Kaltgewalztes nicht
en acier à grains non orientés laminées à froid et 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, 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
© 2026 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 10106:2026 E
worldwide for CEN national Members.

Contents Page
European foreword . 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 supplied by the purchaser . 8
5.1 Mandatory information . 8
5.2 Options . 8
5.3 Example of an order . 9
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
7 Technical requirements . 10
7.1 Magnetic properties . 10
7.1.1 General . 10
7.1.2 Magnetic polarization . 10
7.1.3 Specific total loss . 10
7.1.4 Anisotropy of loss . 11
7.2 Geometric characteristics and tolerances . 12
7.2.1 Thickness . 12
7.2.2 Width . 13
7.2.3 Length . 14
7.2.4 Edge camber . 14
7.2.5 Edge wave (wave factor). 14
7.2.6 Residual curvature . 14
7.3 Technological characteristics . 15
7.3.1 Density . 15
7.3.2 Stacking factor . 15
7.3.3 Number of bends . 15
7.3.4 Deviation from the shearing line . 15
7.3.5 Insulation coatings properties . 15
8 Inspection and testing . 15
8.1 General . 15
8.2 Selection of samples . 16
8.3 Preparation of test specimens . 16
8.3.1 Magnetic properties . 16
8.3.2 Geometrical characteristics and tolerances . 17
8.3.3 Technological characteristics . 17
8.4 Test methods . 17
8.4.1 General . 17
8.4.2 Magnetic properties . 17
8.4.3 Geometrical characteristics and tolerances . 18
8.4.4 Technological characteristics . 18
8.5 Retests . 19
9 Marking, labelling and packaging . 19
10 Complaints . 19
Annex A (informative) Non-specified magnetic properties . 20
Annex B (informative) Density determination . 21
Annex C (informative) Minimum stacking factor for coated products . 22
Bibliography . 23

European foreword
This document (prEN 10106:2026) 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 10106:2015.
— the normative references and the definitions have been updated;
— the list of options is more detailed (see 5.2);
— “defects” has been replaced by “imperfections”;
— technical requirements have been updated (see Clause 7);
— throughout the document, editorial changes have been made to improve the quality of the text.

1 Scope
This document specifies cold-rolled non-oriented electrical steel strip and sheet in nominal thicknesses
of 0,35 mm, 0,50 mm, 0,65 mm and 1,00 mm. In particular, it specifies general requirements, the
magnetic properties, geometric characteristics and tolerances, technological characteristics as well as the
inspection procedure.
This document applies to materials supplied in the fully annealed condition intended for the construction
of magnetic circuits. It does not apply to semi-processed material.
These magnetic materials correspond to EN 60404-1:2017, Class C.21.
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 10027-1, Designation systems for steels — Part 1: Steel names
EN 10027-2, Designation systems for steels — Part 2: Numerical system
EN 10204, Metallic products — Types of inspection documents
EN 10251:2024, 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 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 60404-2)
EN IEC 60404-11, Magnetic materials — Part 11: Methods of measurement of the surface insulation
resistance of electrical steel strip and sheet (IEC 60404-11)
EN IEC 60404-12, Magnetic materials — Part 12: Methods of test for the assessment of the thermal
endurance of surface insulation coatings on electrical steel strip and sheet (IEC 60404-12)
EN IEC 60404-13, Magnetic materials — Part 13: Methods of measurement of resistivity, density and
stacking factor of electrical steel strip and sheet (IEC 60404-13)
EN ISO 7799, Metallic materials — Sheet and strip 3 mm thick or less — Reverse bend test (ISO 7799)
IEC 60050-121, International Electrotechnical Vocabulary — Chapter 121: Electromagnetism
IEC 60050-221, International Electrotechnical Vocabulary — Chapter 221: Magnetic materials and
components
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 terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp/
— IEC Electropedia: available at https://www.electropedia.org/
3.1
edge wave
wave factor
variation of flatness of a length of strip or sheet taking a form of waves at the slit edge of the product after
longitudinal side trimming or slitting 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.
[SOURCE: EN 10251:2024, definition 3.1]

Key
1 flat surface
2 sheet
3 rolling direction
h height of wave (mm)
l length of wave (mm)
Figure 1 — Example of wave
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
[SOURCE: EN 10251:2024, definition 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
Note 1 to entry: See Figure 2.
[SOURCE: EN 10251:2024, definition 3.3]

Figure 2 — Verification of the edge camber
3.4
number of bends
counts of alternate bends 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
3.5
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 stresses of the material
4 Classification and designation
4.1 Classification
The grades covered by this document are classified according to the value of the maximum specific total
loss in watts per kilogram and according to the nominal thickness of the material (0,35 mm, 0,50 mm,
0,65 mm and 1,00 mm).
4.2 Designation
For the steel grades covered by this document, the steel names are allocated in accordance with
EN 10027-1. The steel numbers are allocated in accordance with EN 10027-2.
The steel name comprises the following in the order given:
a) capital letter M for electrical steel;
b) number of one hundred times the specified value of maximum specific total loss at 50 Hz, in watts per
kilogram and corresponding to the nominal product thickness, at 1,5 T;
c) one hundred times the nominal thickness of the material, in millimetres;
d) characteristic letter A for non-oriented electrical sheet or strip supplied in the fully processed state.
EXAMPLE Non-oriented electrical steel sheet or strip with a maximum specific total loss at 1,5 T of 2,50 W/kg
at 50 Hz, a nominal thickness of 0,35 mm, supplied in the fully processed state: M250–35A.
5 Information supplied by the purchaser
5.1 Mandatory information
For material to adequately comply with the requirements of this document, the purchaser shall include
the following information in their enquiry or order:
a) the quantity required;
b) the type of product (strip or sheet);
c) the number of this document, i.e. EN 10106;
d) the steel name or number (see 4.2);
e) the direction of coils, axis horizontal (h) or vertical (v) (see 6.2);
f) the internal diameter of coil (see 6.2);
g) any limitation on the mass of a bundle of sheets or of a coil or limitation of external diameter (see
6.2);
h) any limitation of the mass of the packing unit (see 6.2);
i) the presence and type of insulation coating (see 6.3);
j) the dimensions of strips or sheets required, including any limitation on the external diameter of a coil
(see 6.2 and 7.2.2);
k) the inspection procedure required including the nature of the related document (see 8.1).
5.2 Options
The following options may be agreed at the time of enquiry and order. lf the purchaser does not indicate
his 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 or interleaves and their optional marking (see 6.2);
2) insulation coating properties (see 6.3);
3) specific total loss only applicable for longitudinal or transverse test pieces (see 7.1.3);
c
4) density determination (see Table 1, Footnote and Annex B);
5) minus tolerances for nominal width (see Table 3);
6) specific inspection (see 8.1);
7) type of acceptance unit (see 8.1);
8) higher number of strips for Epstein test (see Table 4);
9) marking of the products (see Clause 9).
5.3 Example of an order
18 t strip with 0,35 mm thickness in accordance with EN 10106, made of steel grade M270-35A, delivered
in coils with a width of 1 000 mm and a maximum mass of 3 500 kg, vertical coil axis (v), with specific
inspection, inspection report 3.1 in accordance with EN 10204:
18 t – strip – EN 10106 — M270-35A – 1000 mm – max. 3500 kg – v – 3.1
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
For sheets the material is supplied in bundles and for strip the material is supplied in coils.
The mass of bundles of sheets or the mass and/or the external diameter of coils shall be agreed at the
time of enquiry and order.
The mass of the package unit shall be agreed at the time of enquiry and order.
The recommended value for the internal diameter of coils is approximately 508 mm or 610 mm.
The strip shall be of constant width and wound in such a way that the edges are superimposed in a regular
manner and that the side faces of the coil are substantially flat.
The coils shall be sufficiently tightly wound so that they do not collapse under their own weight.
The 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 (see 5.2, option 1). 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 further processing
of the product.
Sheets that 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
The products are usually supplied either without insulation or with insulation on one or both sides in
accordance with EN 10342. When the product is supplied with insulation, the nature of the insulation, its
thickness and properties, the stacking factor and their verification shall be agreed at the time of enquiry
and order (see 5.2, Option 2) and in accordance with the values stated in Table C.1.
6.4 Surface condition
1)
The surfaces shall be smooth and clean, free from grease and rust . Dispersed imperfections such as
scratches, blisters, cracks, etc. are only permitted if the products are within the tolerances on thickness
and if these defects are not detrimental to the correct use of the supplied material.
For products supplied with insulation coating, the coating shall be sufficiently adherent so that it does
not become detached during manufacturing operations. During the reverse bend test (see 8.4.4.2), the
coating shall not become detached after a bend of 90°. If the coating becomes detached during the test,
the piece from which the sample of the product from which the test specimen was taken shall be subjected
to a shearing test. By shearing the sample with well sharpened tools, a detachment of large pieces of the
coating shall not be admissible. However, some slight chipping of the coating at the sheared edges shall
be tolerated.
If the product is to be immersed in a fluid or is to be given an additional coating or impregnation, an
agreement initiated by the purchaser should be reached with the supplier to ensure compatibility
between the fluid and the surface insulation coating.
CEN/TR 17856 and CEN/TR 18048 describe all the relevant measurement procedures for coating
properties.
6.5 Suitability for cutting
The product shall be suitable for cutting or punching without causing premature wear of the tools. The
product shall be suitable for cutting or punching accurately into the usual shapes when appropriate
cutting or punching tools and technologies are used.
7 Technical requirements
7.1 Magnetic properties
7.1.1 General
The properties defined in 7.1.2 to 7.1.4 are applicable to products in the delivery conditions defined in
6.3. The magnetic properties shall be measured in accordance with EN 60404-2.
For products supplied with insulation coating, the mass of the coating should be taken into account to
determine the magnetic properties.
7.1.2 Magnetic polarization
The specified minimum values of peak magnetic polarization at the peak magnetic field strengths H of
2 500 A/m, 5 000 A/m and 10 000 A/m at 50 Hz shall be as given in Table 1.
7.1.3 Sp
...