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GB 1499.2-2024 PDF in English


GB 1499.2-2024 (GB1499.2-2024) PDF English
Standard IDContents [version]USDSTEP2[PDF] delivered inName of Chinese StandardStatus
GB 1499.2-2024English220 Add to Cart 0-9 seconds. Auto-delivery. Steel for the reinforcement of concrete - Part 2: Hot rolled ribbed bars Valid
GB/T 1499.2-2018English135 Add to Cart 0-9 seconds. Auto-delivery. Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed bars Valid
GB 1499.2-2007English85 Add to Cart 0-9 seconds. Auto-delivery. [GB/T 1499.2-2007] Steel for the reinforcement of concrete -- Part 2: Hot rolled ribbed bars [including MODIFICATION 1] Obsolete
Standards related to (historical): GB 1499.2-2024
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GB 1499.2-2024: PDF in English

GB 1499.2-2024 GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.15 CCS H 44 Replacing GB/T 1499.2-2018 Steel for the reinforcement of concrete - Part 2.Hot rolled ribbed bars ISSUED ON. JUNE 25, 2024 IMPLEMENTED ON. SEPTEMBER 25, 2024 Issued by. State Administration for Market Regulation; Standardization Administration of the People's Republic of China. Table of Contents Foreword... 3 Introduction... 5 1 Scope... 6 2 Normative references... 6 3 Terms and definitions... 8 4 Classification, designation... 9 5 Size, shape, weight, and allowable deviation... 10 6 Smelting and performance... 14 7 Test methods... 18 8 Inspection rules... 21 9 Packaging, marks, and quality certification... 22 Annex A (informative) Formula for calculating the relative rib area of steel bars... 24 Annex B (normative) Macroscopic metallography, section Vickers hardness, microstructure and inspection methods of steel bars... 25 Annex C (normative) Rules for characteristic value inspection... 28 Steel for the reinforcement of concrete - Part 2.Hot rolled ribbed bars 1 Scope This document specifies the classification, designation, size, shape, weight and allowable deviation, smelting and performance, test methods, inspection rules, packaging, marks and quality certificates for the hot rolled ribbed bars the reinforcement of concrete (hereinafter referred to as steel bars). This document is applicable to hot rolled bars and hot rolled bars of fine grains for the reinforcement of concrete. This document is not applicable to recycled steel bars and waste heat treated steel bars that are re rolled from finished steel products. 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 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 numerical values and judgement 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 condition. 3.2 hot rolled bars of fine grains Fine grained steel bars formed through controlled rolling and controlled cooling processes during hot rolling. 3.3 ribbed bars Steel bars for concrete structures of which the cross-section is usually circular and the surface is ribbed. 3.4 longitudinal rib A uniform continuous rib parallel to the axis of the steel bar. 3.5 transverse rib Other ribs that are not parallel to the axis of the steel bar. 3.6 crescent ribbed bars A steel that that the longitudinal section of the transverse rib is crescent shaped and does not intersect with the longitudinal rib. 3.7 nominal diameter The diameter of a circle equal to the nominal cross-sectional area of the steel bar. 3.8 specific projected rib area The ratio of the projected area of the transverse rib on the plane perpendicular to the axis of the steel bar to the product of the nominal circumference of the steel bar and the spacing between the transverse ribs. 3.9 rib height The measured 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 The distance between the centers of two adjacent transverse ribs measured parallel to the axis of the steel bar. 3.11 characteristic value The percentile value corresponding to a specified probability in an infinite number of tests. 3.12 core The cross-section of the steel bar does not include the transverse ribs and longitudinal ribs. 4 Classification, designation 4.1 Steel bars are classified into 400, 500, and 600 grades based on their yield strength characteristic values. 4.2 The composition and meaning of steel bar designations are shown in Table 1. less than 45°. When the angle β is not greater than 70°, the direction of the transverse ribs on the opposite sides of the steel bar shall be opposite. b) The nominal spacing between transverse ribs shall not exceed 70% of the nominal diameter of the steel bar. c) The angle α between the side of the transverse rib and the surface of the steel bar shall not be less than 45°. d) The total gap between the ends of the transverse ribs on adjacent sides of the steel bar (including the width of the longitudinal ribs) shall not exceed 20% of the nominal circumference of the steel bar. e) When the nominal diameter of the steel bar is not greater than 12 mm, the relative rib area is not less than 0.055.When the nominal diameter is 14 mm and 16 mm, the relative rib area is not less than 0.060.When the nominal diameter is greater than 16 mm, the relative rib area shall not be less than 0.065.The calculation of the relative rib area of steel bars is shown in Annex A. 5.3.2 Steel bars are divided into two types. those with longitudinal ribs and those without longitudinal ribs. Crescent ribbed steel bars with longitudinal ribs are as shown in Figure 1.The size and allowable deviation of steel bars shall comply with the provisions of Table 3.The inner diameter size of crescent ribbed steel bars without longitudinal ribs can be adjusted according to the requirements of both the supplier and the purchaser based on Table 3. 5.3.3 When the allowable deviation between the actual weight and theoretical weight of the steel bars meets the requirements in Table 4, the deviation of the inner diameter of the steel bars and the height of the longitudinal ribs are not considered as delivery conditions. m - theoretical unit weight, in grams per millimeter (g/mm). 7.5 Macroscopic metallography, cross-sectional Vickers hardness, microstructure inspection The inspection of macroscopic metallography, cross-sectional Vickers hardness, and microstructure shall be carried out in accordance with the provisions of Annex B. Microstructure shall be used as the basis for arbitration. 7.6 Numerical rounding and judgment The rounding and judgment of the test results shall comply with the provisions of YB/T 081. 8 Inspection rules 8.1 Inspection classification The inspection of steel bars is divided into characteristic value inspection and delivery inspection. 8.2 Characteristic value inspection 8.2.1 Characteristic value inspection is applicable to the following situations. a) Supplier's inspection of product quality control; b) Inspection required by the purchaser and after mutual agreement between the supplier and the purchaser; c) Third party product certification and arbitration inspection. 8.2.2 The characteristic value inspection shall be conducted in accordance with the provisions of Annex C. 8.3 Delivery inspection 8.3.1 Applicable situation Delivery inspection is applicable to the inspection of steel bar acceptance batches. 8.3.2 Batching rules 8.3.2.1 Steel bars shall be inspected and accepted in batches. Each batch is composed of steel bars of the same designation, furnace number, and specification. 8.3.2.2 It is allowed to form a mixed batch of different furnace numbers with the same designation, smelting method, and pouring method for rolling. But the difference in carbon content between the melting analysis of each furnace number shall not exceed 0.02%. The difference in manganese content shall not exceed 0.15%. The weight of the mixed batch shall not exceed 60 t. Rolling finished products shall not be grouped into mixed batches. 8.3.3 Inspection items and sampling quantity When the weight of each batch is not more than 60 t, samples shall be taken and inspected according to the requirements in Table 8.When the weight of each batch is greater than 60 t, for every additional 40 t (or the remainder of less than 40 t), 1 tensile test specimen and 1 bending test specimen shall be added. An additional reverse bending test specimen shall be added for steel bars of designations with "E". 8.3.4 Inspection results The inspection results of each inspection item of steel bars (including steel bars straightened by coiling) shall comply with the relevant provisions of Chapter 5 and Chapter 6. 8.3.5 Re-inspection and judgement The re-inspection and judgment of steel bars shall comply with the provisions of GB/T 17505.The weight deviation of steel bars shall not be resampled for re-inspection. 9 Packaging, marks, and quality certification 9.1 The surface marks of steel bars shall comply with the following regulations. a) Steel bars shall be marked with the grade mark, production enterprise serial number (the first 2 digits of the administrative division code and the last 3 digits of the license specified in GB/T 2260), and nominal diameter in millimeters on their surface. Allow registered factory names or trademarks to replace the first two digits of the administrative division code. b) The steel bar designation mark is represented by Arabic numerals or Arabic numerals plus English letters. HRB400, HRB500, and HRB600 are represented by 4, 5, and 6, respectively. HRBF400 and HRBF500 are respectively represented by C4 and C5.HRB400E and HRB500E are respectively represented as 4E and 5E. HRBF400E and HRBF500E are respectively represented as C4E and C5E. The factory name is represented by the Chinese Pinyin prefix. The nominal diameter in millimeters is represented by Arabic numerals. c) The mark shall be clear and concise. The size of the mark shall be appropriately specified by the supplier according to the diameter of the steel bars. The transverse ribs intersecting with the logo can be removed. Annex C (normative) Rules for characteristic value inspection C.1 Test batching and sampling quantity C.1.1 Test batching For the purpose of testing, delivery shall be divided into test batches. The batch rules shall comply with the provisions of 8.3.2. C.1.2 Sampling quantity per batch C.1.2.1 Two specimens shall be taken from different steel bars for chemical composition (finished product analysis). C.1.2.2 The mechanical properties shall be tested by taking 15 specimens from different steel bars (if 60 specimens are applicable, see C.2.1). C.2 Evaluation of test results C.2.1 Parameter verification To verify the specified performance, such as characteristic parameters ReL, Rm, Agt, or A, the following parameters shall be determined. a) All individual values Xi (n=15) of 15 specimens; b) Average value m15 (n=15); c) Standard deviation S15 (n=15). If all performance meets the conditions given in formula (C.1), then the test batch meets the requirements. Where, fk - required characteristic value; 2.33 - the value of the acceptance coefficient k when n=15.90% confidence level (1- α=0.90) and the failure rate is 5% (P=0.95). ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.