Detail of GB/T 2585-2021

Introduction of GB/T 2585-2021

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is developed in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 2585-2007 Hot-rolled steel rails for railway. In addition to a number of editorial changes, the following technical changes have been made with respect to GB/T 2585-2007: ——The scope of this standard has been modified (see Clause 1, or Clause 1 of Edition 2007); ——“Classification” has been added (see Clause 5); ——Regulations of dimension, shape and permissible deviation have been modified (see 6.1.2, or 5.1.2 of Edition 2007); ——The “designation and ingredient requirements” have been modified（see 7.2, or 6.2.1 of Edition 2007）; ——The requirements of hydrogen content have been added (see 7.2,4); ——The requirements for mechanical properties of heat-treated steel rails have been added (see 7.4); ——Relevant regulations of decarburized layer have been modified (see 7.6, or 6.8 of Edition 2007); ——Relevant regulations of non-metallic inclusion have been modified (see 7.7, or 6.9 of Edition 2007); ——Relevant regulations of surface quality have been modified (see 7.10, or 6.12 of Edition 2007); ——Relevant regulations of “Fatigue crack growth rate” have been added (see 7.13); ——Relevant regulations of hydrogen content have been modified, and those on determination of oxygen and nitrogen elements have been added (see 8.5, or 7.2 of Edition 2007); ——Relevant regulations of “Type inspection” have been added (see 9.2); ——The re-inspection regulations of inspection items, such as decarburized layer, non-metallic inclusions and microstructure, have been modified (see 9.4, or 8.3 of Edition 2007); ——Relevant regulations of steel rail label have been modified (see 10.1, or 9.1 of Edition 2007); This standard was proposed by China Iron and Steel Association. This standard is under the jurisdiction of SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China. The previous editions of this standard are as follows: ——GB 181-1963; ——GB 182-1963; ——GB 183-1963; ——GB 2585-1981 and GB/T 2585-2007. Hot-rolled steel rails for railway 1 Scope This standard specifies order information, classification, dimension, shape, weight and permissible deviation, technical requirements, test methods, inspection rules, marking and quality certificate of steel rails for railway. This standard is applicable to 38kg/m-75kg/m symmetrical section hot-rolled steel rails and on-line heat-treated steel rails. 2 Normative references The following referenced documents are indispensable for the application of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223.3 Methods for chemical analysis of iron, steel and alloy — The diantipyrylmethane phosphomolybdate gravimetric method for the determination of phosphorus content GB/T 223.5 Steel and iron — Determination of acid-soluble silicon and total silicon content — Reduced molybdosilicate spectrophotometric method GB/T 223.9 Iron, steel and alloy — Determination of aluminum content — Chrome azurol S photometric method GB/T 223.11 Iron, steel and alloy — Determination of chromium content — Visual titration or potentiometric titration method GB/T 223.12 Methods for chemical analysis of iron, steel and alloy — The sodium carbonate separation-diphenyl carbazide photometric method for the determination of chromium content 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 223.18 Methods for chemical analysis of iron, steel and alloy — The sodium (potassium) periodate photometric method for the determination of manganese content GB/T 223.19 Methods for chemical analysis of iron, steel and alloy — The neocuproine-chloroform extraction photometric method for the determination of copper content GB/T 223.23 Iron, steel and alloy — Determination of nickel content — The dimethylglyoxime spectrophotometric method GB/T 223.26 Iron, steel and alloy — Determination of molybdenum content — Thiocyanate spectrophotometric method GB/T 223.40 Iron, steel and alloy — Determination of niobium content by the sulphochlorophenol S spectrophotometric method GB/T 223.54 Methods for chemical analysis of iron, steel and alloy — Flame atomic absorption spectrometric method for the determination of nickel content GB/T 223.58 Methods for chemical analysis of iron, steel and alloy — The sodium arsenite-sodium nitrite titrimetric method for the determination of manganese content GB/T 223.59 Iron, steel and alloy — Determination of phosphorus content—Bismuth phosphomolybdate blue spectrophotometric method and antimony phosphomolybdate blue spectrophotometric method 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 223.61 Methods for chemical analysis of iron, steel and alloy — The ammonium phosphomolybdate volumetric method for the determination of phosphorus 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 223.64 Iron, steel and alloy — Determination of manganese content — Flame atomic absorption spectrometric method GB/T 223.67 Iron steel and alloy — Determination of sulfur content — Methylene blue spectrophotometric method 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 223.69 Iron, steel and alloy — Determination of carbon contents — Gas-volumetric method after combustion in the pipe furnace 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 223.72 Iron, steel and alloy — Determination of sulfur content — Gravimetric method GB/T 223.76 Methods for chemical analysis of iron, steel and alloy — The flame atomic absorption spectrometric method for the determination of vanadium content GB/T 223.82 Steel and iron — Determination of hydrogen content — Thermal conductivity/infrared method after fusion under inert gas GB/T 224 Determination of depth of decarburization of steels 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 YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy YB/T 951 Method of the ultrasonic inspection for rails 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 heat all casting billets cast by molten steel in one furnace until a billet is completely cast by molten steel in the next furnace (excluding the billet) 3.2 sequence continuous casting of molten steel with the same designation but in different heats in intermediate ladle 3.3 on-line heat-treatment heat-treatment process for obtaining fine laminated pearlite structure by directly accelerating cooling with rolling waste heat 4 Order information The purchaser shall provide the following information to the supplier if making an order: a) product name; b) serial number of this standard; c) rail type and speed rating; d) designation and delivered state of the rails（hot rolled or hot-treated); e) rail end status (number of drilled holes); f) quantity, length, short-length rate (fixed-length, non-fixed-length); g) other special requirements. 5 Classification According to the operating speed, the steel rails are divided into less than 200km/h and 200km/h and above.

Contents of GB/T 2585-2021

Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Order information 5 Classification 6 Dimension, shape, weight and permissible deviation 7 Technical requirements 8 Test methods 9 Inspection rules 10 Marking and quality certificate Annex A (Normative) Dimension drawing of steel rail section type Annex B (Normative) Sample diagram of rail dimension inspection Annex C (Normative) Standard diagrams for macrostructure of steel rails Annex D (Normative) Test method for residual stress at rail flange Annex E (Normative) Test method for plane strain fracture toughness (KIC) of steel rail