This standard specifies hot-rolled steel rails for railway in terms of the terms and definitions, ordering information, dimension, profile, quality and permissible deviation, technical requirements, test methods, inspection rules, marking, quality certificate and quality assurance.
This standard is applicable to hot-rolled steel rails of 160km/h or below by continuous casting, but not applicable to overall-length heat-treated steel rails.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated reference, subsequent amendments to (excluding any corrigendum), or revisions of, any of these publications do not apply. However, parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. For any undated references, the latest edition of the document referred to applies.
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products
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 223.35 Methods for Chemical Analysis of Iron, Steel and Alloy—The Pulse Heating Inert Gas Fusion—Coulometric Titration Method for the Determination of Oxygen Content
GB/T 223.40 Iron Steel and Alloy - Determination of Niobium Content by the Sulphochlorophenol S Spectrophotometric Method
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 223.53 Methods for Chemical Analysis of Iron, Steel and Alloy—The Flame Atomic Absorption Spectrophotometric Method for the Determination of Copper 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 224 Determination of Depth of Decarburization of Steel (GB/T 224-1987, eqv ISO 3887: 1976)
GB/T 226 Etch Test for Macrostructure and Defect of Steels (GB/T 226-1991, neq ISO 4969:1980)
GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892:1998)
GB/T 230.1 "Metallic Rockwell Hardness Test—Part 1: Test Method (Scales A, B, C, D, E, F, G, H, K, N, T) (GB/T 230.1-2004, ISO 6508-1: 1999, MOD)
GB/T 231.1 Metallic Materials—Brinell Hardness Test—Part 1: Test Method (GB/T 231.1-2002, eqv ISO 6506-1:1999)
GB/T 2101 General Requirement of Acceptance Packaging, Marking and Certification for Section Steel
GB/T 3075 Method of Axial Force Controlled Fatigue Testing of Metals
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 10561 Steel—Determination of Content of Non-metallic Inclusion—Micrographic Method Using Standard Diagrams
GB/T 13298 Metal-Inspection Method of Microstructure
GB/T 17505 Steel and Steel Products: General Technical Delivery Requirements (GB/T 17505-1998, eqv ISO 404: 1992)
GB/T 19001 Quality Management Systems—Requirements (GB/T 19001-2000, idt ISO 9001:2000)
GB/T 20066 Steel and Iron—Sampling and Preparation of Samples for the Determination of Chemical Composition (GB/T 20066-2006, ISO 14284:1998, IDT)
YB /T 951 Method of the Ultrasonic Inspection for Rails
3 Terms and Definitions
For the purpose of this standard, the following terms and definitions apply.
3.1
heat
all blanks casted by one furnace of molten steel until a certain steel billet is completely casted by the molten steel of the next furnace (excluding this steel billet)
3.2
sequence
continuous casting of different heats of the same designation in tundish
