CEN/TS 15718:2011

SLOVENSKI STANDARD
01-november-2011
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Railway applications - Wheelsets and bogies - Product requirements for cast wheels
Bahnanwendungen - Radsätze und Drehgestelle - Produktanforderungen für Gussräder
Applications ferroviaires - Essieux montés et bogies - Exigences pour roues en acier
moulé
Ta slovenski standard je istoveten z: CEN/TS 15718:2011
ICS:
45.040 Materiali in deli za železniško Materials and components
tehniko for railway engineering
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL SPECIFICATION
CEN/TS 15718
SPÉCIFICATION TECHNIQUE
TECHNISCHE SPEZIFIKATION
September 2011
ICS 45.040
English Version
Railway applications - Wheelsets and bogies - Product
requirements for cast wheels
Applications ferroviaires - Essieux montés et bogies - Bahnanwendungen - Radsätze und Drehgestelle -
Exigences pour roues en acier moulé Produktanforderungen für Gussräder
This Technical Specification (CEN/TS) was approved by CEN on 3 January 2011 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to submit their
comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS available
promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in parallel to the CEN/TS)
until the final decision about the possible conversion of the CEN/TS into an EN is reached.

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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TS 15718:2011: E
worldwide for CEN national Members.

Contents Page
Forew ord .4
Introduction .5
1 Scope .6
2 Normative references .6
3 Product definition .7
3.1 Chemical composition .7
3.1.1 Values to be achieved .7
3.1.2 Location of the sample .7
3.1.3 Chemical analysis .7
3.2 Mechanical characteristics .7
3.2.1 Tensile test characteristics .7
3.2.2 Hardness characteristics in the rim .9
3.2.3 Impact test characteristics .10
3.2.4 Fatigue characteristics .10
3.2.5 Fracture toughness characteristics of the rim .11
3.3 Heat treatment homogeneity .12
3.3.1 Location of measurement .12
3.3.2 Values to be achieved .12
3.3.3 Test method .12
3.4 Metallurgical structure .12
3.5 Material cleanliness .12
3.5.1 Micrographic cleanliness .12
3.5.2 Internal integrity .13
3.6 Residual stresses .16
3.6.1 General .16
3.6.2 Values to be achieved .16
3.6.3 Test piece .17
3.6.4 Measurement methods .17
3.7 Surface characteristics .17
3.7.1 Surface appearance .17
3.7.2 Surface integrity .17
3.8 Geometric tolerances .18
3.9 Static imbalance .20
3.10 Shot peening - Requirements .20
3.10.1 General .20
3.10.2 Values to be achieved .21
3.10.3 Measurement method .21
3.11 Protection against corrosion .21
3.12 Wheel maintenance capacity .21
3.13 Manufacture’s markings .21
Annex A (normative) Hydrogen control at the point of steel melt for monobloc wheels .23
A.1 Sampling .23
A.2 Analysis methods .23
A.3 Operating precautions .23
Annex B (informative) Example of a test method for the determination of fatigue characteristics .24
B.1 Test piece .24
B.2 Test rig .24
B.3 Test monitoring .24
B.4 Analysis of results .24
Annex C (informative) Strain gauge method for determining the variation of circumferential
residual stresses located deep under the tread (destructive method) . 25
C.1 Principle . 25
C.2 Procedure . 25
C.2.1 Fitting of a rim cross section with strain gauges prior to wheel cutting . 25
C.2.2 Execution of cutting . 25
C.2.3 Operations to be executed during cutting . 26
C.3 Expression of results . 26
C.3.1 Calculation of the variation of the circumferential residual stress located deep under the
tread . 26
C.3.2 Calculation of the variation of the circumferential stress created by cutting operation 1 . 26
C.3.3 Calculation of the variation of the circumferential stress created by cutting operation 2 . 27
C.3.4 Calculation of the variation of the circumferential stress created by cutting operation 3 . 27
C.3.5 Final diagram representing the variation of the circumferential stress located deep under
the tread . 27
Annex D (informative) Product qualification . 31
D.1 General . 31
D.2 Requirements . 31
D.2.1 Requirements for the producer . 31
D.2.2 Requirements for the product . 32
D.3 Qualification procedure . 32
D.3.1 General . 32
D.3.2 Documentation required . 32
D.3.3 Evaluation of manufacturing equipment and of the production processes . 33
D.3.4 Laboratory tests . 33
D.3.5 Testing of wheels . 34
D.4 Qualification certificate . 34
D.4.1 Condition of the validity . 34
D.4.2 Modification and extension . 34
D.4.3 Transference . 35
D.4.4 Lapsed certificate . 35
D.4.5 Cancellation . 35
D.5 Qualification documents .
...