TB/T 2344.2-2020 Rails - Part 2: Switch and crossing rails
1 Scope
This part of TB/T 2344 specifies the terms and definitions, information required for ordering, geometric dimensions and specifications, technical requirements, inspection methods, inspection rules, marking and quality certificate for switch and crossing rails.
This part is applicable to hot-rolled and heat-treated asymmetric section rails used for railway switches/crossings and expansion joints (hereinafter referred to as rails).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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.
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoyl-N-phenylhydroxylamine extraction photometric method for the determination of vanadium 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 - Thermal conductivity/infrared method after fusion under inert gas
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
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine 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 Inspection methods of microstructure for metals
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)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
TB/T 412 Technical specification on turnouts for standard-gauge railway
TB/T 2344.1-2020 Rails - Part 1: 43kg/m~75kg/m rails
TB/T 3307.1 Technical specification for manufacturing of high speed turnouts - Part 1: Manufacturing and assembly
YB/T 951 Method of the ultrasonic testing for rails
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heat
all blooms cast from one heat of molten steel, excluding the first bloom cast from the next heat of molten steel that enters the tundish
3.2
sequence
sequential casting of molten steel of the same grade but from different heats in the tundish
3.3
transition area
portion cast from a mixture of molten steel from two heats
3.4
on-line heat treatment
heat treatment that utilizes the residual heat from rolling for direct accelerated cooling to obtain a fine lamellar pearlite structure
3.5
off-line heat treatment
heat treatment that involves re-austenitizing after rolling and cooling, followed by accelerated cooling to obtain a fine lamellar pearlite structure
4 Information required for ordering
The following basic information shall be provided by the purchaser at the time of order:
a) Product name;
b) Standard number of the product;
c) Steel grade;
d) Rail profile;
e) Length, quantity and proportion of short rails;
f) Other requirements.
5 Geometric dimensions and specifications
5.1 Profile dimensions and limit deviations
5.1.1 The profile dimensions of the rails shall comply with the provisions of Annex A. Rail profiles include 50AT1, 60AT1, 60AT2, 60AT3, and 60TY1.
5.1.2 The limit deviations for the profiles, end faces, and lengths of rails shall be as specified in Table 1.
Table 1 Limit deviations for dimensions
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Information required for ordering
5 Geometric dimensions and specifications
5.1 Profile dimensions and limit deviations
5.2 Straightness and twist
5.3 Length and mass
6 Technical requirements
6.1 Manufacturing methods
6.2 Steel grade and chemical composition
6.3 Tensile properties
6.4 Hardness
6.5 Microstructure
6.6 Decarburization
6.7 Non-metallic inclusions
6.8 Macrostructure
6.9 Surface quality
6.10 Ultrasonic testing
6.11 Residual stress at rail foot
6.12 Fracture toughness
6.13 Fatigue crack growth rate
6.14 Specimen fatigue
6.15 Off-line heat treatment
7 Inspection methods
7.1 Inspection items, inspection frequencies, sampling locations, and inspection methods
7.2 Hydrogen content
7.3 Total oxygen content and nitrogen content
7.4 Hardness
7.5 Microstructure
7.6 Ultrasonic testing
7.7 Residual stress at rail foot
7.8 Fracture toughness
7.9 Fatigue crack growth rate
7.10 Specimen fatigue
8 Inspection rules
8.1 Supervision
8.2 Type inspection
8.3 End-of-manufacturing inspection
8.4 Re-inspection and judgment
9 Marking
10 Quality certificate
Annex A (Normative) Profile dimensions and parameters of rails
Annex B (Normative) Naming rules for switch and crossing rails
Annex C (Informative) Comparison of names of switch and crossing rails specified in different standards
Annex D (Normative) Off-line heat treatment of switch and crossing rail parts
Bibliography
Standard
TB/T 2344.2-2020 Rails-Part 2: Switch and crossing rails (English)
TB/T 2344.2-2020 Rails - Part 2: Switch and crossing rails
1 Scope
This part of TB/T 2344 specifies the terms and definitions, information required for ordering, geometric dimensions and specifications, technical requirements, inspection methods, inspection rules, marking and quality certificate for switch and crossing rails.
This part is applicable to hot-rolled and heat-treated asymmetric section rails used for railway switches/crossings and expansion joints (hereinafter referred to as rails).
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions 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.
GB/T 223.14 Methods for chemical analysis of iron, steel and alloy - The N-benzoyl-N-phenylhydroxylamine extraction photometric method for the determination of vanadium 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 - Thermal conductivity/infrared method after fusion under inert gas
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
GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine 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 Inspection methods of microstructure for metals
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)
GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method
TB/T 412 Technical specification on turnouts for standard-gauge railway
TB/T 2344.1-2020 Rails - Part 1: 43kg/m~75kg/m rails
TB/T 3307.1 Technical specification for manufacturing of high speed turnouts - Part 1: Manufacturing and assembly
YB/T 951 Method of the ultrasonic testing for rails
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heat
all blooms cast from one heat of molten steel, excluding the first bloom cast from the next heat of molten steel that enters the tundish
3.2
sequence
sequential casting of molten steel of the same grade but from different heats in the tundish
3.3
transition area
portion cast from a mixture of molten steel from two heats
3.4
on-line heat treatment
heat treatment that utilizes the residual heat from rolling for direct accelerated cooling to obtain a fine lamellar pearlite structure
3.5
off-line heat treatment
heat treatment that involves re-austenitizing after rolling and cooling, followed by accelerated cooling to obtain a fine lamellar pearlite structure
4 Information required for ordering
The following basic information shall be provided by the purchaser at the time of order:
a) Product name;
b) Standard number of the product;
c) Steel grade;
d) Rail profile;
e) Length, quantity and proportion of short rails;
f) Other requirements.
5 Geometric dimensions and specifications
5.1 Profile dimensions and limit deviations
5.1.1 The profile dimensions of the rails shall comply with the provisions of Annex A. Rail profiles include 50AT1, 60AT1, 60AT2, 60AT3, and 60TY1.
5.1.2 The limit deviations for the profiles, end faces, and lengths of rails shall be as specified in Table 1.
Table 1 Limit deviations for dimensions
Contents of TB/T 2344.2-2020
Contents
Foreword III
1 Scope
2 Normative references
3 Terms and definitions
4 Information required for ordering
5 Geometric dimensions and specifications
5.1 Profile dimensions and limit deviations
5.2 Straightness and twist
5.3 Length and mass
6 Technical requirements
6.1 Manufacturing methods
6.2 Steel grade and chemical composition
6.3 Tensile properties
6.4 Hardness
6.5 Microstructure
6.6 Decarburization
6.7 Non-metallic inclusions
6.8 Macrostructure
6.9 Surface quality
6.10 Ultrasonic testing
6.11 Residual stress at rail foot
6.12 Fracture toughness
6.13 Fatigue crack growth rate
6.14 Specimen fatigue
6.15 Off-line heat treatment
7 Inspection methods
7.1 Inspection items, inspection frequencies, sampling locations, and inspection methods
7.2 Hydrogen content
7.3 Total oxygen content and nitrogen content
7.4 Hardness
7.5 Microstructure
7.6 Ultrasonic testing
7.7 Residual stress at rail foot
7.8 Fracture toughness
7.9 Fatigue crack growth rate
7.10 Specimen fatigue
8 Inspection rules
8.1 Supervision
8.2 Type inspection
8.3 End-of-manufacturing inspection
8.4 Re-inspection and judgment
9 Marking
10 Quality certificate
Annex A (Normative) Profile dimensions and parameters of rails
Annex B (Normative) Naming rules for switch and crossing rails
Annex C (Informative) Comparison of names of switch and crossing rails specified in different standards
Annex D (Normative) Off-line heat treatment of switch and crossing rail parts
Bibliography
