SN EN 15049 : 2007

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviations
5 Requirements
   5.1 Introduction
   5.2 Documents to be provided by the customer
   5.3 Documents to be provided by the supplier
   5.4 Design analysis
   5.5 Arrangement and design
   5.6 Straight torsion bar ends and connections
        5.6.1 General
        5.6.2 Design of the straight torsion bar end
6 Product definition
   6.1 Geometrical characteristics and space envelope
   6.2 Mechanical requirements
        6.2.1 Loading and allowable stresses
        6.2.2 Service life
        6.2.3 Investigation of the strain
        6.2.4 Evaluation of the strain
   6.3 Physical requirements
        6.3.1 Material grade
        6.3.2 Internal integrity
        6.3.3 Inclusion cleanliness
        6.3.4 Forged torsion bar ends
        6.3.5 Decarburization
        6.3.6 Surface condition
        6.3.7 Residual compressive stresses on the surface
        6.3.8 Grain size
   6.4 Surface protection
        6.4.1 Generalities
        6.4.2 Temporary protection
        6.4.3 Permanent protection
   6.5 Characteristic moment of torsion/angular displacement
   6.6 Mass
7 Mechanical properties for manufacturing
   7.1 Hardness
   7.2 Tensile strength
   7.3 Toughness
8 Tests and test procedures
   8.1 General requirements
   8.2 Measuring equipment
   8.3 Tensile strength
   8.4 Toughness
   8.5 Hardness
   8.6 Material
   8.7 Depth of decarburization
   8.8 Grain size
   8.9 Forged torsion bar ends
   8.10 Residual compressive stresses on the surface
   8.11 Surface defects
   8.12 Surface condition
   8.13 Dimensional check
   8.14 Characteristic moment of torsion/angular displacement
   8.15 Mass
   8.16 Internal integrity
   8.17 Surface protection
   8.18 Loading and allowable stresses
9 Quality assurance and final approval
   9.1 Quality assurance system and staff qualification
   9.2 Product qualification procedures and samples
   9.3 Control and monitoring of production quality
        9.3.1 General
        9.3.2 Quality assurance plan
        9.3.3 Control by sampling lots
   9.4 Requirements for control and monitoring of
        production quality
        9.4.1 General
        9.4.2 Non-compliance
        9.4.3 Documentation
   9.5 Handling instructions
10 Marking of torsion bars
11 Packaging
Annex A (normative) Material for hot formed and
        quenched and tempered torsion bars
   A.1 General
   A.2 Material for torsion bars, steel
Annex B (normative) Inspection of torsion bars
        made of round bars by the magnetic crack
        detection method
   B.1 Object
   B.2 Tests
   B.3 Safety measures
Annex C (normative) Checking shot peening efficiency
        by ALMEN method
  C.1 Field of application
  C.2 Checking the procedure
  C.3 Equipment and installations
        C.3.1 ALMEN A2 test piece
        C.3.2 Test piece holder
        C.3.3 ALMEN measuring device
Annex D (normative) Examination for inclusions
  D.1 Object
  D.2 Test methods
        D.2.1 Test method according to DIN 50602
        D.2.2 Test method according to NF A 04-106
        D.2.3 Test method according to SS 111116
Annex E (normative) Taking of test pieces - Areas
        of the location of test pieces
Bibliography

Applies to torsion bars made of steel for anti-roll bar systems used on railway vehicles.