oSIST prEN 13262:2023

SLOVENSKI STANDARD
oSIST prEN 13262:2023
01-april-2023
Nadomešča:
SIST EN 13262:2020
Železniške naprave - Kolesne dvojice in podstavni vozički - Kolesa - Zahtevane
lastnosti proizvoda
Railway applications - Wheelsets and bogies - Wheels - Product requirements
Bahnanwendungen - Radsätze und Drehgestelle - Räder - Produktanforderungen
Applications ferroviaires - Essieux montés et bogies - Roues - Prescriptions pour le
produit
Ta slovenski standard je istoveten z: prEN 13262
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
oSIST prEN 13262:2023 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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oSIST prEN 13262:2023

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oSIST prEN 13262:2023


DRAFT
EUROPEAN STANDARD
prEN 13262
NORME EUROPÉENNE

EUROPÄISCHE NORM

February 2023
ICS 45.040 Will supersede EN 13262:2020
English Version

Railway applications - Wheelsets and bogies - Wheels -
Product requirements
Applications ferroviaires - Essieux montés et bogies - Bahnanwendungen - Radsätze und Drehgestelle -
Roues - Prescriptions pour le produit Räder - Produktanforderungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.

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 13262:2023 E
worldwide for CEN national Members.

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oSIST prEN 13262:2023
prEN 13262:2023 (E)
Contents Page
European foreword . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Product definition . 8
4.1 Chemical composition . 8
4.1.1 Values to be achieved . 8
4.1.2 Sampling position . 8
4.1.3 Chemical analysis . 8
4.2 Mechanical characteristics . 8
4.2.1 Characteristics from the tensile test . 8
4.2.2 Hardness characteristics in the rim . 10
4.2.3 Impact resistance characteristics . 13
4.2.4 Fatigue characteristics . 13
4.2.5 Toughness characteristics of the rim . 14
4.3 Heat treatment homogeneity . 16
4.3.1 Values to be achieved . 16
4.3.2 Test pieces . 16
4.3.3 Test method . 16
4.4 Material cleanliness . 16
4.4.1 Micrographic cleanliness . 16
4.4.2 Internal integrity . 18
4.5 Residual stresses . 21
4.5.1 General . 21
4.5.2 Values to be achieved . 21
4.5.3 Test piece . 21
4.5.4 Measurement methods . 21
4.6 Surface characteristics . 21
4.6.1 Surface finish . 21
4.6.2 Surface condition for the oil injection hole . 22
4.6.3 Surface integrity . 22
4.7 Geometrical tolerances . 23
4.7.1 General . 23
4.7.2 Wear groove . 26
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4.8 Static imbalance .26
4.9 Coating and protection against corrosion .27
4.9.1 General requirements .27
4.9.2 Thermo-sensitive paint on tread braked wheels .27
4.10 Marking .28
5 Product qualification . 29
6 Conditions of supply of the product . 29
7 Tips for choosing the steel grade . 29
Annexe A (normative) Evaluation process for the acceptance of new materials . 30
A.1 General . 30
A.2 First step: Characterisation of a new steel grade . 30
A.3 Step two: Testing in service . 30
A.4 Step three: Report . 31
Annexe B (informative) Examples of test benches for fatigue testing . 32
B.1 Test piece . 32
B.2 First test method . 32
B.3 Second test method . 33
B.4 Third test method . 34
Annexe C (informative) Strain gauge method of determining the variation in
circumferential residual stresses deep under the running surface (destructive
method) . 36
C.1 Method principle . 36
C.2 Procedure . 36
C.3 Calculation of the variation of the circumferential residual stress deep under
the running surface . 37
Annexe D (normative) Product qualification . 41
D.1 Introduction . 41
D.2 General . 41
D.3 Requirements . 43
D.4 Qualification procedure . 43
D.5 Validity of the qualification . 46
D.6 Qualification record . 46
Annexe E (normative) Conditions of supply of the product . 48
E.1 Introduction . 48
E.2 General . 48
E.3 Delivery states . 49
E.4 Unit checks. 49
E.5 Batch sampling check . 49
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E.6 Quality plan . 51
E.7 Permissible repairs . 52
E.8 Retest . 52
Annexe F (normative) Measurement of the hydrogen content at the time of development
of steel for monobloc wheels . 53
F.1 General . 53
F.2 Sampling . 53
F.3 Analysis method . 53
F.4 Precautions . 53
Annexe G (informative) Common applications of steel grades . 54
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of EU Directive (EU) 2016/797/EC aimed to be covered . 55
Bibliography . 59

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European foreword
This document (prEN 13262:2023) has been prepared by the CEN/TC 256 “Railway applications”
Technical Committee, the secretariat of which is held by DIN.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13262:2020.
This document has been prepared under a Standardization Request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of EU
Directive(s) / Regulation(s).
For relationship with Directive(s) / Regulation(s), see informative Annex ZA, which forms an integral
part of this document.
In comparison with EN 13262:2020, the following technical changes are included in this revision:
— mandatory application of thermo-sensitive paint in tread braked freight application;
— definition of assessment/ product requirements for thermo-sensitive paint;
— an improved definition of the product groups submitted to qualification;
— improved requirements to assess product qualification after changes made in the manufacturing
process.
The informative annexes to this document provide additional guidance that is not mandatory but that
helps to understand or use the document.
NOTE The informative annexes can contain optional requirements. For example, a test method that is
optional, or presented as an example, can contain requirements, but it is not necessary to meet these requirements
to be in compliance with the document.
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1 Scope
This document specifies the characteristics of wheels for all heavy rail track gauges.
This document applies to heavy rail vehicles and applies, in principle, to other vehicles such as urban
rail vehicles. Five steel grades, ER6, ER7, ER8, ERS8 and ER9, are defined in this document.
NOTE 1 Steel grade ERS8 has been introduced in this document as an optimization of steel grades ER8 and ER9
due to contact fatigue (RCF), taking into account service feedback from Europe, for example, BS 5892-3 in force in
the United Kingdom.
Some features are provided as a Category 1 or Category 2 function.
The requirements defined in this document apply to cylindrical bores. Most requirements also apply to
wheels with tapered bores. Specific requirements for tapered bores (e.g. geometrical dimensions, etc.)
are defined in the technical specification.
This document applies to monobloc wheels in vacuum degassed steel, forged and rolled, with surface
treated rims, which have already been the subject of extensive commercial applications on a European
network or have complied with a technical approval procedure according to EN 13979-1:2020 to
validate their design.
Annex A describes the evaluation process for accepting new materials that are not included in this
document.
This document defines the requirements to be met for wheels; the technical approval procedure is not
part of the scope of this document.
NOTE 2 A "surface-treated rim" is achieved by heat treatment which aims to harden the rim and create
compressive residual stress.
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 10020:2000, Definition and classification of grades of steel
EN 13979-1:2020, Railway Applications - Wheelsets and bogies - Monobloc wheels - Technical approval
procedure – Part 1: Forged and rolled wheels
EN ISO 148-1:2016, Metallic materials - Charpy pendulum impact test - Part 1: Test method (ISO
148-1:2016)
EN ISO 1101:2017, Geometrical product specifications (GPS) - Geometrical tolerancing - Tolerances of
form, orientation, location and run-out (ISO 1101:2017)
EN ISO 6506-1:2014, Metallic materials - Brinell hardness test - Part 1: Test method (ISO 6506-1:2005)
EN ISO 6892-1:2019, Metallic materials - Tensile testing - Part 1: Method of test at room temperature (ISO
6892-1:2019)
EN ISO 14284:2022, Steel and iron - Sampling and preparation of samples for the determination of
chemical composition (ISO 14284:2022)
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ISO 4967:2013, Steel - Determination of content of non-metallic inclusions - Micrographic method using
standard diagrams
ISO 5948:2018, Railway rolling stock material - Ultrasonic acceptance testing
ISO 6933:1986, Railway rolling stock material - Magnetic particle acceptance testing
1
ISO/TR 9769:2018 , Steel and iron - Review of available methods of analysis
ASTM E399-19, Standard test method for linear-elastic plane-strain fracture toughness KIc of metallic
materials
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology 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
Technical Specification
document describing specific parameters and/or product requirements in addition to the requirements
of this document
3.2
batch
batch consisting of wheels assumed to have the same characteristics
Note 1 to entry: A batch consists of wheels of the same design, forged with the raw material from a single cast
with the same warm forging process and a single heat treatment process. If the raw material is obtained from
several casts with the expected chemical composition, the resulting wheels can be combined in a batch. In this
case, it is necessary to demonstrate in the product qualification that the wheels manufactured from these different
casts meet the requirements for product qualification.
3.3
nominal diameter
diameter of the running tread of a new wheel as indicated on the wheel drawing
3.4
wheel categories
classification of the component, based on operational aspects, which determines the list of requirements
to be applied
Note 1 to entry: Category 1 is generally selected when the operating train speed is greater than 200 km/h.
Note 2 to entry: Category 2 is generally selected when the operating speed is 200 km/h or less
Note 3 to entry: These categories can also be defined in accordance with the technical specification.

1 See also CEN/TR 10261:2018.
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4 Product definition
4.1 Chemical composition
4.1.1 Values to be achieved
The maximum percentages of the different elements specified are given in Table 1.
Table 1 — Maximum percentages of the different elements specified
a
 Maximum content in %
Cr +
Steel
b b c
C Si Mn P S  Cr Cu Mo Ni V Mo +
grade
Ni
ER6 0,48 0,40 0,75 0,020 0,015 0,30 0,30 0,08 0,30 0,06 0,50
ER7 0,52 0,40 0,80 0,020 0,015 0,30 0,30 0,08 0,30 0,06 0,50
ER8 0,56 0,40 0,80 0,020 0,015 0,30 0,30 0,08 0,30 0,06 0,50
ERS8 0,57 1,10 1,10 0,020 0,015 0,30 0,30 0,08 0,30 0,06 0,60
ER9 0,60 0,40 0,80 0,020 0,015 0,30 0,30 0,08 0,30 0,06 0,50
a
 For specific applications, variations of requirements within the limits of the maximum levels can be agreed in
the technical specification.
b
 A maximum content of 0,025 % may be agreed in the technical specification for specific applications.
c
 A minimum sulphur content may be agreed in the technical specification based on the steel development
process to protect against hydrogen embrittlement.

4.1.2 Sampling position
The sample for determining the chemical composition shall be taken 15 mm under the running tread at
nominal diameter.
NOTE The running tread is the nominal position on the running surface where the wheel and rail are in contact.
The chemical composition can also be determined by casting analysis. In this case, the chemical
composition shall be adapted in the technical specification.
4.1.3 Chemical analysis
The chemical composition analysis shall be performed in accordance with ISO/TR 9769:2018 unless
another standard is defined in the technical specification.
For example, ASTM E415-14 and ASTM E1019-11 can be applied.
4.2 Mechanical characteristics
4.2.1 Characteristics from the tensile test
4.2.1.1 Values to be achieved
Characteristics in the wheel rim and web are given in Table 2.
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Table 2 — Characteristics in the wheel rim and web
Rim Web
a b
Steel grade ReH Rm A5 Reduction of Rm A5
(MPa) (MPa) % (MPa) %
ER6 ≥ 500 780/900 ≥ 15 ≥ 100 ≥ 16
ER7 ≥ 520 820/940 ≥ 14 ≥ 110 ≥ 16
ER8 ≥ 540 860/980 ≥ 13 ≥ 120 ≥ 16
ERS8 ≥ 580 900/1020 ≥ 13 ≥ 110 ≥ 14
ER9 ≥ 580 900/1050 ≥ 12 ≥ 130 ≥ 14
a
If there is no apparent yield strength, the conventional Rp0,2 limit shall be determined.
b
Decrease in tensile strength of the web relative to the rim for the same wheel.

If there are no other requirements in the technical specification, for steel grades ER7, ER8, ERS8 and
ER9, a minimum value of 355 MPa for the yield strength in the web is required. For steel grade ER6, a
minimum value of 310 MPa for the yield strength in the web is required.
4.2.1.2 Position of the test pieces
The test pieces shall be taken from the wheel rim and web. Their positions are shown in Figure 1.
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Dimensions in millimetres

Key
1 tensile test piece in the rim (15 mm axis under the running surface considering its nominal diameter)
2 tensile test piece in the web
3 impact bending test piece
4 nominal diameter
5 notch
Figure 1 — Position of test pieces
4.2.1.3 Test method
The test shall be carried out in accordance with the requirements of EN ISO 6892-1:2019. The nominal
diameter of the test piece shall be at least 10 mm and the length of the deformation gauge shall be five
times the diameter. If the test pieces cannot be taken from the web, a smaller diameter shall be agreed
in the technical specification.
4.2.2 Hardness characteristics in the rim
4.2.2.1 Values to be achieved
The minimum Brinell hardness values given in Table 3 apply up to a maximum of 35 mm of wear range
under the running surface. If the thickness of the wear range is greater than 35 mm, the values shall be
defined in the technical specification.
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The hardness value at the connection between the web and the rim (point A in Figure 2) shall be at least
10 points lower than that measured at the wear range limit.
Table 3 — Values to be achieved for hardness characteristics in the rim
 Minimum Brinell hardness value
Steel grade Category 1 Category 2
ER6 — 225
ER7 245 235
ER8 245 245
ERS8 250 250
ER9 255 255
4.2.2.2 Position of measuring points
Four measurements are made on a radial section of the rim, as shown in Figure 2.
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Dimensions in millimetres

Key
1 limit of wear range or diameter of last achievable re-profiling (according to technical specification).
2 nominal diameter
3 internal diameter (on external face)
Figure 2 — Measurements made on a radial section of the rim
The values in Figure 2 are valid for standard gauge axles and for a rim profile width of 135 mm and
above. Other gauges and profiles may be defined in the technical specification.
4.2.2.3 Test method
It shall be carried out according to EN ISO 6506-1:2014. The diameter of the ball is 5 mm.
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4.2.3 Impact resistance characteristics
4.2.3.1 Values to be achieved
The values to be achieved for the impact test are given in Table 4. For each temperature, they represent
the average value and the minimum value for the three test pieces defined in 4.2.3.2, and on the other
hand the minimum unit values. At + 20 °C, U-notch test pieces shall be used. At – 20 °C, V-notch test
pieces shall be used.
Table 4 — Values to be achieved for impact resistance characteristics
KU (Joules) at + 20 °C KV (Joules) at – 20 °C
Steel grade
Average values Minimum values Average values Minimum values
ER6 ≥ 17 ≥ 12 ≥ 12 ≥ 8
ER7 ≥ 17 ≥ 12 ≥ 10 ≥ 7
ER8 ≥ 17 ≥ 12 ≥ 10 ≥ 5
ERS8 ≥15 ≥11 ≥ 9 ≥ 5
ER9 ≥ 13 ≥ 9 ≥ 8 ≥ 5

4.2.3.2 Position of the test pieces
The position of the three test pieces is given in Figure 1. The axis of the bottom of the notches shall be
parallel to the A-A axis in Figure 1.
4.2.3.3 Test method
The test shall be carried out in accordance with EN ISO 148-1:2016.
4.2.4 Fatigue characteristics
4.2.4.1 Values to be achieved
The stress magnitude Δσ that a wheel web shall withstand, regardless of the steel grade, for 10 million
cycles without showing crack initiation with a probability of 99,7 % is given in Table 5.
This requirement is met by testing two wheels, in accordance with Annex D, D.4.4.
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Table 5 — Values to be achieved for fatigue characteristics of the web
Maximum roughness Fatigue stress limits according to Values to be achieved
the wheel design evaluation for fatigue
Ra
procedure (EN 13979-1:2020) characteristics
µm
Δσ Δσ (99,7%)
(MPa) (MPa)
6,3 360 450
12,5 290 315

NOTE The purpose of obtaining these values is to ensure that the product has characteristics superior to those
used to define the allowable stresses required to size the wheel web under fatigue.
Given the approximations inherent in a fatigue calculation, the differentiation of five steel grades is
unrealistic for this characteristic. For steel grade ER6, if a lower value is expected, it shall be specified
and justified in the technical specification.
4.2.4.2 Fatigue
...