TB/T 2344-2012 English PDF (TBT2344-2012)

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TB/T 2344-2012: [Including 2017XG1] Technical specifications for the procurement of 43 kg/m~75 kg/m rails
TB/T 2344-2012
RAILWAY INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 45.080
S 11
Replacing TB/T 2344-2003, partial replacing TB/T 2635-2004
Technical Specifications for the
Procurement of 43kg/m ~ 75kg/m Rails
[Including Amendment No.1 [2017XG1]]
ISSUED ON: MARCH 01, 2012
IMPLEMENTED ON: JULY 01, 2012
Issued by: Ministry of Railways of PRC
Table of Contents
Foreword ... 5
1 Scope ... 7
2 Normative References ... 7
3 Terms and Definitions ... 9
4 Ordering Required Information ... 9
5 Type Size, Length, Weight and Limit Deviation ... 10
5.1 Type size and limit deviation ... 10
5.2 Straightness and distortion ... 10
5.3 Bolt hole ... 11
5.4 Rail end chamfering ... 11
5.5 Length and weight ... 13
6 Technical Requirements ... 14
6.1 Manufacturing method ... 14
6.2 Designation and chemical composition ... 14
6.3 Tensile properties ... 16
6.4 Hardness ... 16
6.5 Microstructure ... 17
6.6 Decarburization layer ... 17
6.7 Non-metallic inclusions ... 18
6.8 Macrostructure ... 19
6.9 Drop-Weight ... 19
6.10 Surface quality ... 19
6.11 Ultrasonic flaw detection ... 20
6.12 Residual stress on rail base ... 21
6.13 Fracture toughness ... 21
6.14 Fatigue crack growth rate ... 21
6.15 Fatigue ... 21
6.16 Heat treatment on the rail end ... 21
7 Test Methods ... 21
7.1 Inspection items, inspection frequency, sampling positions and test methods
... 21
7.2 Hydrogen content ... 24
7.3 Total oxygen content and nitrogen content ... 24
7.4 Hardness ... 25
7.5 Microstructure ... 25
7.6 Drop-weight ... 25
7.7 Ultrasonic flaw detection ... 26
7.8 Residual stress on the rail base ... 29
7.9 Fracture toughness ... 29
7.10 Fatigue crack growth rate ... 29
7.11 Fatigue ... 30
8 Inspection Rules ... 32
8.1 Supervision ... 32
8.2 Type inspection ... 32
8.3 Exit-factory inspection ... 32
8.4 Reinspection and judgment ... 33
8.5 Numerical rounding off ... 34
9 Marking, Quality Certificate ... 35
9.1 Marking ... 35
9.2 Quality certificate ... 36
10 Quality Assurance ... 36
10.1 Quality assurance system ... 36
10.2 Quality assurance period ... 36
Appendix A (Normative) 43kg/m ~ 75kg/m Rail Type and Size ... 38
Appendix B (Normative) Schematic Diagram of Rail Geometry Inspection
Template ... 45
Appendix C (Normative) Impermissible Defects on Rail Lateral Acid Leaching
Test Strips ... 54
Appendix D (Normative) Rail Plane Strain Fracture Toughness KIC Test Method
... 61
Appendix E (Normative) Heat Treatment Technical Condition on the End of Rail
... 65
Appendix F (Normative) Method for Measuring Longitudinal Residual Stress of
Rail Base Surface ... 68
Bibliography ... 70
Amendment No.1 [2017XG1] TB/T 2344-2012 Technical Specification for the
Procurement of 43kg/m ~ 75kg/m Rails ... 71
Technical Specifications for the
Procurement of 43kg/m ~ 75kg/m Rails
1 Scope
This Standard specifies the terms and definitions, ordering required information, type
size and limit deviation, technical requirements, test methods, inspection rules,
marking and quality certificate, quality assurance, and the like contents of 43kg/m ~
75kg/m rails.
This Standard is applicable to the 43kg/m ~ 75kg/m hot-rolled and online heat-treated
rails for the railway with the maximum running speed of 160km/h. this Standard can be
referred by the heat-treated rails for high-speed railways.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 223.14 Methods for Chemical Analysis of Iron, Steel and Alloy - The N-
Benzoy-N-Phenylhydroxylamine Extraction Photometric Method for the
Determination of Vanadium Content
GB/T 223.49 Methods for Chemical Analysis of Iron, Steel and Alloy - Extraction
Separation-Chlorophosphonazo mA Spectrophotometric Method for the
Determination of the Total Rare Earth Content
GB/T 223.60 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Perchloric Acid Dehydration Gravimetric Method for the Determination of Silicon
Content
GB/T 223.62 Methods for Chemical Analysis of Iron, Steel and Alloy - The Butyl
Acetate Extraction Photometric Method for the Determination of Phosphorus
Content
GB/T 223.63 Methods for Chemical Analysis of Iron, Steel and Alloy - The Sodium
(Potassium) Periodate Photometric Method for the Determination of Manganese
Content
GB/T 223.68 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Potassium Iodate Titration Method after Combustion in the Pipe Furnace for the
Determination of Sulfur Content
GB/T 223.71 Methods for Chemical Analysis of Iron, Steel and Alloy - The
Gravimetric Method after Combustion in the Pipe Furnace for the Determination
of Carbon Content
GB/T 223.82 Steel and Iron - Determination of Hydrogen Content - Inert Gas
Impulse Fusion Heat Conductivity Method
GB/T 226 Test Method for Macrostructure and Defect of Steel By Etching
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
GB/T 230.1 Metallic Materials - Rockwell Hardness Test - Part 1: Test Method
GB/T 231.1 Metallic Materials - Brinell Hardness Test - Part 1: Test Method
GB/T 3075 Metallic Materials - Fatigue Testing - Axial-Force-Controlled Method
GB/T 4161 Metallic Materials - Determination of Plane-Strain Fracture Toughness
– KIC test
GB/T 4336 Standard Test Method for Spark Discharge Atomic Emission
Spectrometric Analysis of Carbon and Low-Alloy Steel (Routine Method)
GB/T 4340.1 Metallic Materials - Vickers Hardness Test - Part 1: Test Method
GB/T 6398 Metallic Materials - Fatigue Testing - Fatigue Crack Growth Method
GB/T 10561-2005 Steel - Determination of Content of Nonmetallic Inclusions -
Micrographic Method Using Standards Diagrams
GB/T 11261 Steel and Iron – Determination of Oxygen Content - The Pulse
Heating Inert Gas Fusion-Infra-Red Absorption Method
GB/T 13298 Metal - Inspection Method of Microstructure
GB/T 19001 Quality Management Systems - Requirements
GB/T 20066 Steel and Iron-Sampling and Preparation of Samples for the
Determination of Chemical Composition
GB/T 20123 Steel and Iron - Determination of Total Carbon and Sulfur Content
Infrared Absorption Method after Combustion in an Induction Furnace (Routine
Method)
GB/T 20124 Steel and Iron - Determination of Nitrogen Content - Thermal
Conductimetric Method after Fusion in a Current of Inert Gas (Routine Method)
YB/T 081 Rule for Rounding off of Numerical Values and Judgement of Testing
Values for Technical Standards of Metallurgy
YB/T 951 Method of the Ultrasonic Inspection for Rails
3 Terms and Definitions
For the purpose of this document, the following terms and definitions apply.
3.1 Heat
All casting billets from the molten steel in one furnace; but excluding the first casting
billet cast into the tundish from the molten steel in the next furnace.
3.2 Sequence
The molten steel with the same designation and different heats is continuously cast in
the tundish.
3.3 Transition area
The part cast by mixing of the molten steels in the two furnaces.
3.4 On line heat-treatment
The heat-treatment that uses the residual heat of rolling to acceler...