Standard No.:	GB 1499.2-2024
English Name:	Steel for the reinforcement of concrete—Part 2:Hot rolled ribbed bars
Chinese Name:	钢筋混凝土用钢 第2部分：热轧带肋钢筋
Chinese Classification:	H44    Profile steel and deformed steel
Professional Classification:	GB    National Standard
ICS Classification:	77.140.15 77.140.15    Steels for reinforcement of concrete 77.140.15
Source Content Issued by:	SAMR; SAC
Issued on:	2024-6-25
Implemented on:	2024-9-25
Status:	valid
Superseding:	GB/T 1499.2-2018 Steel for the reinforcement of concrete—Part 2:Hot rolled ribbed bars
Target Language:	English
File Format:	PDF
Word Count:	7000 words
Translation Price(USD):	210.0
Delivery:	via email in 1 business day

GB 1499.2-2024 Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars 1 Scope This document specifies the classification, designation, dimension, shape, weight and permissible tolerance, smelting and properties, test methods, inspection rules, packaging, marking and quality certificates for hot rolled ribbed bars for the reinforcement of concrete (hereinafter referred to as steel bars). This document is applicable to hot rolled ribbed bars and hot rolled ribbed bars of fine grains for the reinforcement of concrete. This document is not applicable to recycled steel bars re-rolled from finished steels or residual heat-treated steel bars. 2 Normative references The following 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 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-benzoy-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 Iron, steel and alloy - Determination of nitrogen content - Indophenol blue spectrophotometric method 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 Iron, steel and alloy - Determination of manganese content - Sodium (potassium) periodate spectrophotometric method GB/T 223.84 Steel, iron and alloy - Determination of titanium content - Diantipyrylmethane spectrophotometric method GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace GB/T 2101 General requirement of acceptance, packaging, marking and certification for section steel GB/T 2260 Codes for the administrative divisions of the People’s Republic of China GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 4340.1 Metallic materials - Vickers hardness test - Part 1: Test method GB/T 6394 Determination of estimating the average grain size of metal GB/T 13298 Inspection methods of microstructure for metals 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 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 GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method GB/T 28900 Test methods of steel for reinforcement of concrete JGJ 18 Specification for welding and acceptance of reinforcing steel bars JGJ 107 Technical specification for mechanical splicing of steel reinforcing bars YB/T 081 Rule for rounding off of numberical values and judgment of testing values for technical standards of metallurgy 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 hot rolled bars steel bars delivered in hot-rolled state 3.2 hot rolled bars of fine grains fine-grained steel bars formed during hot rolling through controlled rolling and controlled cooling processes 3.3 ribbed bars steel bars used for concrete structures, usually with a circular cross-section and ribbed surface 3.4 longitudinal rib uniform, continuous ribs parallel to the axis of the steel bar 3.5 transverse rib ribs that are not parallel to the axis of the steel bar 3.6 crescent ribbed bars steel bars with crescent-shaped transverse ribs that do not intersect with the longitudinal ribs 3.7 nominal diameter diameter of a circle that has an area equal to the nominal cross-sectional area of the steel bar 3.8 specific projected rib area ratio of the projected area of the transverse ribs on a plane perpendicular to the steel bar axis to the product of the steel bar's nominal circumference and the spacing between transverse ribs   3.9 rib height distance from the highest point of the rib to the surface of the core perpendicular to the axis of the steel bar 3.10 rib spacing distance between the centers of two adjacent transverse ribs measured parallel to the axis of the steel bar 3.11 characteristic value quantile value corresponding to a specified probability in an infinite number of tests 3.12 core cross-section of the steel bar excluding the transverse and longitudinal ribs 4 Classification and designation 4.1 According to the characteristic value of yield strength, steel bars are classified into Class 400, Class 500, and Class 600. 4.2 See Table 1 for the composition and meaning of designation for steel bars.

Foreword i Introduction iii 1 Scope 2 Normative references 3 Terms and definitions 4 Classification and designation 5 Dimensions, shapes, weights and permissible tolerances 6 Smelting and properties 7 Test methods 8 Inspection rules 9 Packaging, marking and quality certificate Annex A (Informative) Calculation equations for specific projected rib area of steel bars Annex B (Normative) Macro-metallography, cross-section Vickers hardness, and microstructure of steel bars and inspection methods Annex C (Normative) Inspection rules for characteristic values