TB/T 2344.1-2020 Rails - Part 1: 43 kg/m~75 kg/m rails
1 Scope
This standard specifies the terms and definitions, classification, information to be supplied by the purchaser, geometric dimensions and specifications, technical requirements, inspection methods, inspection rules, marking, and quality certificate for 43 kg/m ~ 75 kg/m rails.
This standard applies to hot-rolled and on-line heat-treated rails for railway track usage. This standard may apply to rails for other rail transit.
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-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 - 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 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 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
YB/T 951 Method of the ultrasonic inspection for rails
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heat
all strands cast from a single furnace charge of liquid steel melt, excluding the first strand cast from the next heat entering the tundish
3.2
sequence
liquid steel melt of any number of heats, of the same steel grade, which undergo continuous casting in tundishes
3.3
transition area
part cast from the mixture of two different heats of liquid steel
3.4
on-line heat treatment
heat treatment that utilizes the residual heat from rolling for direct accelerated cooling to obtain a fine lamellar pearlitic microstructure
4 Classification
Classification of geometric dimension tolerances, straightness and twist, aluminum and oxygen content in steel, non-metallic inclusions, and surface quality is carried out according to operating speeds of ≥200 km/h and <200 km/h.
5 Information to be supplied by the purchaser
The purchaser shall provide the supplier with the following basic information at the time of order:
a)product name;
b)reference to the standard applies to the product;
c)rail profile;
d)speed grade;
e)steel grade;
f)undrilled or drilled rails (number of holes at one or both ends);
g)length, quantity and percentage of short-length rails;
h)other requirements.
6 Geometric dimensions and specifications
6.1 Profile dimensions and tolerances
6.1.1 The rail profile dimensions shall be in accordance with Annex A. Rail profiles include 43 kg/m, 50 kg/m, 60 kg/m (60, 60N), and 75 kg/m (75, 75N).
6.1.2 The tolerances on the rail cross-section, end face, length, and bolt hole dimensions shall be as given in Table 1.
Table 1 Dimension tolerances
Dimensions in millimeters
Item Tolerances Gauge, figure number a
≥200km/h <200km/h
Height of rail (H) ±0.6 ±0.6 Figure B.3
Width of rail head (WH) ±0.5 ±0.5 Figure B.4
Crown profile b (C) +0.6
-0.3 +0.6
-0.5 Figure B.5
Sectional asymmetry c (As) ±1.2 ±1.2 Figure B.6
Height of fishing (HF) +0.6
-0.5 +0.6
-0.5 Figure B.7
Web thickness (WT) +1.0
-0.5 +1.0
-0.5 Figure B.8
Width of rail foot (WF) ±1.0 +1.0
-1.5 Figure B.9
Foot toe thickness d (TF) +0.75
-0.5 +0.75
-0.5 Figure B.10
Foot base concavity ≤0.3 ≤0.4 —
Inclination of end face (vertical, horizontal) ≤0.6 ≤0.8 —
Bolt hole diameter ±0.7 ±0.8 Figure B.11
Bolt hole position ±0.7 ±0.8 Figure B.12
Combined deviation of bolt hole diameter and position (Td/c) 2.0 2.0 —
Length (at ambient temperature of 20°C) For undrilled rails ≤25m rail ±10 —
> 25m rail ±30
For drilled rails ≤25m rail ±6 —
a The gauges for checking rail geometric dimensions shall comply with Annex B.
b Crown profile requirements do not apply to 43 kg/m and 50 kg/m rails.
c The tolerance for sectional asymmetry of 43 kg/m rails is ±1.5 mm.
d Rail foot toe thickness requirements do not apply to 43 kg/m rails.
6.2 Straightness and twist
The straightness and twist of the rail shall be as given in Table 2.
Table 2 Straightness and twist
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Information to be supplied by the purchaser
6 Geometric dimensions and specifications
6.1 Profile dimensions and tolerances
6.2 Straightness and twist
6.3 Bolt hole
6.4 Rail end chamfering
6.5 Length and mass
7 Technical requirements
7.1 Manufacturing method
7.2 Steel grade and chemical composition
7.3 Tensile properties
7.4 Hardness
7.5 Microstructure
7.6 Decarburization
7.7 Non-metallic inclusions
7.8 Macrostructure
7.9 Surface quality
7.10 Ultrasonic inspection
7.11 Residual stress in rail foot
7.12 Fracture toughness
7.13 Fatigue crack growth rate
7.14 Specimen fatigue
7.15 Rail end heat treatment
8 Inspection methods
8.1 Inspection items, inspection frequency, sampling location and inspection methods
8.2 Hydrogen content
8.3 Total oxygen content and nitrogen content
8.4 Hardness
8.5 Microstructure
8.6 Ultrasonic testing
8.7 Residual stress at rail foot
8.8 Fracture toughness
8.9 Fatigue crack growth rate
8.10 Fatigue
9 Inspection rules
9.1 Supervision
9.2 Type inspection
9.3 End-of-manufacturing inspection
9.4 Re-inspection and judgment
10 Marking
11 Quality certificate
Annex A (Normative) Rail profiles and dimensions
Annex B (Normative) Schematic diagram of gauges for checking rail geometric dimensions
Annex C (Normative) Unacceptable defects on transverse acid-etched specimens of rails
Annex D (Normative) Test method for rail plane strain fracture toughness KIC
Annex E (Normative) Technical specifications for heat treatment of rail ends
Annex F (Normative) Method for the determination of rail foot surface longitudinal residual stresses
Annex G (Informative) Full-scale rail bending fatigue test method
Bibliography
Standard
TB/T 2344.1-2020 Requirements for domain name service business continuity rnanagernent (English Version)
Standard No.
TB/T 2344.1-2020
Status
valid
Language
English
File Format
PDF
Word Count
16000 words
Price(USD)
480.0
Implemented on
2021-7-1
Delivery
via email in 1 business day
Detail of TB/T 2344.1-2020
Standard No.
TB/T 2344.1-2020
English Name
Requirements for domain name service business continuity rnanagernent
TB/T 2344.1-2020 Rails - Part 1: 43 kg/m~75 kg/m rails
1 Scope
This standard specifies the terms and definitions, classification, information to be supplied by the purchaser, geometric dimensions and specifications, technical requirements, inspection methods, inspection rules, marking, and quality certificate for 43 kg/m ~ 75 kg/m rails.
This standard applies to hot-rolled and on-line heat-treated rails for railway track usage. This standard may apply to rails for other rail transit.
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-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 - 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 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 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
YB/T 951 Method of the ultrasonic inspection for rails
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
heat
all strands cast from a single furnace charge of liquid steel melt, excluding the first strand cast from the next heat entering the tundish
3.2
sequence
liquid steel melt of any number of heats, of the same steel grade, which undergo continuous casting in tundishes
3.3
transition area
part cast from the mixture of two different heats of liquid steel
3.4
on-line heat treatment
heat treatment that utilizes the residual heat from rolling for direct accelerated cooling to obtain a fine lamellar pearlitic microstructure
4 Classification
Classification of geometric dimension tolerances, straightness and twist, aluminum and oxygen content in steel, non-metallic inclusions, and surface quality is carried out according to operating speeds of ≥200 km/h and <200 km/h.
5 Information to be supplied by the purchaser
The purchaser shall provide the supplier with the following basic information at the time of order:
a)product name;
b)reference to the standard applies to the product;
c)rail profile;
d)speed grade;
e)steel grade;
f)undrilled or drilled rails (number of holes at one or both ends);
g)length, quantity and percentage of short-length rails;
h)other requirements.
6 Geometric dimensions and specifications
6.1 Profile dimensions and tolerances
6.1.1 The rail profile dimensions shall be in accordance with Annex A. Rail profiles include 43 kg/m, 50 kg/m, 60 kg/m (60, 60N), and 75 kg/m (75, 75N).
6.1.2 The tolerances on the rail cross-section, end face, length, and bolt hole dimensions shall be as given in Table 1.
Table 1 Dimension tolerances
Dimensions in millimeters
Item Tolerances Gauge, figure number a
≥200km/h <200km/h
Height of rail (H) ±0.6 ±0.6 Figure B.3
Width of rail head (WH) ±0.5 ±0.5 Figure B.4
Crown profile b (C) +0.6
-0.3 +0.6
-0.5 Figure B.5
Sectional asymmetry c (As) ±1.2 ±1.2 Figure B.6
Height of fishing (HF) +0.6
-0.5 +0.6
-0.5 Figure B.7
Web thickness (WT) +1.0
-0.5 +1.0
-0.5 Figure B.8
Width of rail foot (WF) ±1.0 +1.0
-1.5 Figure B.9
Foot toe thickness d (TF) +0.75
-0.5 +0.75
-0.5 Figure B.10
Foot base concavity ≤0.3 ≤0.4 —
Inclination of end face (vertical, horizontal) ≤0.6 ≤0.8 —
Bolt hole diameter ±0.7 ±0.8 Figure B.11
Bolt hole position ±0.7 ±0.8 Figure B.12
Combined deviation of bolt hole diameter and position (Td/c) 2.0 2.0 —
Length (at ambient temperature of 20°C) For undrilled rails ≤25m rail ±10 —
> 25m rail ±30
For drilled rails ≤25m rail ±6 —
a The gauges for checking rail geometric dimensions shall comply with Annex B.
b Crown profile requirements do not apply to 43 kg/m and 50 kg/m rails.
c The tolerance for sectional asymmetry of 43 kg/m rails is ±1.5 mm.
d Rail foot toe thickness requirements do not apply to 43 kg/m rails.
6.2 Straightness and twist
The straightness and twist of the rail shall be as given in Table 2.
Table 2 Straightness and twist
Contents of TB/T 2344.1-2020
Contents
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Classification
5 Information to be supplied by the purchaser
6 Geometric dimensions and specifications
6.1 Profile dimensions and tolerances
6.2 Straightness and twist
6.3 Bolt hole
6.4 Rail end chamfering
6.5 Length and mass
7 Technical requirements
7.1 Manufacturing method
7.2 Steel grade and chemical composition
7.3 Tensile properties
7.4 Hardness
7.5 Microstructure
7.6 Decarburization
7.7 Non-metallic inclusions
7.8 Macrostructure
7.9 Surface quality
7.10 Ultrasonic inspection
7.11 Residual stress in rail foot
7.12 Fracture toughness
7.13 Fatigue crack growth rate
7.14 Specimen fatigue
7.15 Rail end heat treatment
8 Inspection methods
8.1 Inspection items, inspection frequency, sampling location and inspection methods
8.2 Hydrogen content
8.3 Total oxygen content and nitrogen content
8.4 Hardness
8.5 Microstructure
8.6 Ultrasonic testing
8.7 Residual stress at rail foot
8.8 Fracture toughness
8.9 Fatigue crack growth rate
8.10 Fatigue
9 Inspection rules
9.1 Supervision
9.2 Type inspection
9.3 End-of-manufacturing inspection
9.4 Re-inspection and judgment
10 Marking
11 Quality certificate
Annex A (Normative) Rail profiles and dimensions
Annex B (Normative) Schematic diagram of gauges for checking rail geometric dimensions
Annex C (Normative) Unacceptable defects on transverse acid-etched specimens of rails
Annex D (Normative) Test method for rail plane strain fracture toughness KIC
Annex E (Normative) Technical specifications for heat treatment of rail ends
Annex F (Normative) Method for the determination of rail foot surface longitudinal residual stresses
Annex G (Informative) Full-scale rail bending fatigue test method
Bibliography
