YB/T 4641-2018 in English

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 was proposed by China Iron and Steel Industry Association. This standard is under the jurisdiction of the SAC/TC 183 National Technical Committee on Iron and Steel of Standardization Administration of China. Cryogenic ribbed bars for the reinforced concrete tanks of LNG 1 Scope This standard specifies the definition, grade, order contents, dimensions, shapes, weights and permissible deviations, technical requirements, test methods, inspection rules, and packaging, marking and certifications of ribbed bars for the reinforced concrete tanks of LNG. It is applicable to cryogenic ribbed bars with a diameter of not more than 50mm for manufacturing reinforced concrete tanks of LNG (hereinafter referred to as ribbed bars). 2 Normative references The following referenced documents are indispensable for the application 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 222 Permissible tolerances for chemical composition of steel products GB/T 223.5 Steel and iron - Determination of acid-soluble silicon and total silicon content - Reduced molybdosilicate spectrophotometric 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-benzoyl-N-phenylhydroxylamine extraction photometric method for the determination of vanadium content GB/T 223.17 Methods for chemical analysis of iron steel and alloy - The diantipyrylmethane photometric method for the determination of titanium 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 - The thiocyanate spectrophotometric method GB/T 223.37 Methods for chemical analysis of iron, steel and alloy - The indophenol blue photometric methods for the determination of nitrogen content after distillation separation GB/T 223.40 Iron, steel and alloy - Determination of niobium content by the sulphochlorophenol S spectrophotometric method 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 223.63 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 223.69 Iron, steel and alloy - Determination of carbon contents - Gas-volumetric method after combustion in the pipe furnace GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 1499.2 Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars GB/T 2101 General requirement of acceptance, packaging, marking, and certification for section steel GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 17505 Steel and steel products - General technical delivery requirements GB/T 20066 Steel and iron - Sampling and preparation of samples for the determination of chemical composition GB/T 28900 Test methods of steel for reinforcement of concrete YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy 3 Definitions For the purposes of this document, the following terms and definitions apply. 3.1 cryogenic ribbed bars for the reinforced concrete tanks of LNG ribbed bars formed by controlled rolling and controlled cooling process and suitable for the minimum design temperature (-165℃~-170℃) requirements of reinforced concrete tanks of LNG 4 Grade See Table 1 for the composition and meaning of ribbed bar grades.   Table 1 Grade Composition Meaning of English letters HRB500DW Composed of HRB+characteristic value of yield strength+DW HRB——English initial letters of hot rolled ribbed bars DW——pinyin initial letters of “低温” 5 Order contents When ordering, the user shall provide the following information and indicate it in the contract: a) serial number of this standard; b) product name; c) grade; d) dimensions; e) delivery condition; f) weight; g) special requirements. 6 Dimension, shape, weight and permissible tolerance 6.1 The dimensions, shapes, weights and permissible deviations of the ribbed bars shall meet the relevant requirements of GB/T 1499.2. 6.2 As required by the purchaser and indicated in the contract upon the agreement between the supplier and the purchaser, the purchaser can specify the dimension deviation of ribbed bars separately. 7 Technical requirements 7.1 Smelting method, chemical composition (smelting analysis) and carbon equivalent 7.1.1 Steel is smelted by converter or electric furnace, and is refined outside the furnace. 7.1.2 The chemical composition of the ribbed bars (melting analysis) and carbon equivalent shall meet those specified in Table 2.   Table 2 Grade Chemical composition (mass fraction)/% Ceq C Si Mn P S Ni HRB500DW 0.15≤ ≤1.00 ≤1.60 ≤0.030 ≤0.030 0.30~2.0 ≤0.55 7.1.3 In order to ensure the cryogenic temperature property of ribbed bars, alloying elements other than those in Table 2 may be added, such as one or more of Nb, V, Ti, Al, Cr, Mo and Cu, the content of which shall be indicated in the certification.

Introduction

*** Please note: This description may not be accurate, please refer to the official documentation.

Foreword i
1 Scope
2 Normative references
3 Definitions
4 Grade
5 Order contents
6 Dimension, shape, weight and permissible tolerance
7 Technical requirements
8 Test methods
9 Inspection rules
10 Packaging, marking and certification
Annex A (Normative) Test method for cryogenic temperature property of ribbed bars
Annex B (Normative) Characteristic value inspection rules