GB/T 33953-2025 English PDFGB/T 33953: Historical versions
Basic dataStandard ID: GB/T 33953-2025 (GB/T33953-2025)Description (Translated English): Corrosion resistance bars for the reinforcement of concrete Sector / Industry: National Standard (Recommended) Date of Implementation: 2026-03-01 Older Standard (superseded by this standard): GB/T 33953-2017, GB/T 34206-2017 GB/T 33953-2017: Corrosion resistance bars for the reinforcement of concrete---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.Corrosion resistance bars for the reinforcement of concrete ICS 77.140.60 H44 National Standards of People's Republic of China Corrosion resistant steel bars for reinforced concrete Released on.2017-07-12 2018-04-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Administration issued ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard was proposed by the China Iron and Steel Association. This standard is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183). This standard was drafted. China Metallurgical Construction Research Institute Co., Ltd., Iron and Steel Research Institute, Jiangsu Shagang Group Co., Ltd., Guangxi Shenglongye Jin Co., Ltd., Jiangsu Yonggang Group Co., Ltd., Metallurgical Industry Information Standards Institute, Tianjin Tiantie Rolling Steel Co., Ltd., Shenzhen Hua US Steel Co., Ltd., Shandong Shiheng Special Steel Group Co., Ltd., Shanghai Zhongji Pile Industry Co., Ltd., Fushun New Steel Co., Ltd., Shougang Corporation, Jiangsu Changqiang Iron and Steel Co., Ltd., Ma Steel (Group) Holding Co., Ltd., Sanbao Group Co., Ltd., Yongzhou Yongda Steel Iron Co., Ltd. The main drafters of this standard. Zhu Jianguo, Yang Zhongmin, Lu Shanglin, Zhang Jianchun, Ke Xueli, Wu Jinyuan, Wang Yuxi, Shi Guoming, Liu Chuanliang, Wang Changsheng, Zhang Houchan, Deng Qizhi, Qiu Yuelin, Han Jianhuai, Guo Zhan, Wang Guangwen, Li Yukun, Lin Chunlai, Chen Ying, Li Xiaobo, Wang Changcheng, Qu Xiaobo, Liu Ge, Zhou Kai, Guo Zhi'an, Xiao Lijun, Zhu Jianzhou, Liang Baocai, Gong Cui, Li Hongfang, Chen Kaizhi, Lin Jun, Liu Pengxiang. Corrosion resistant steel bars for reinforced concrete1 ScopeThis standard specifies the definition, classification, grade, order content, size, shape, weight and allowable deviation of corrosion resistant steel bars for reinforced concrete. Technical requirements, test methods, inspection rules, packaging, signs and quality certificates. This standard is applicable to reinforced concrete with hot-rolled or controlled-rolled controlled cold-resistant ribbed steel bars that meet the durability design requirements (hereinafter referred to as Rebar). This standard does not apply to stainless steel reinforcement.2 Normative referencesThe following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Permissible deviation of chemical composition of finished products of GB/T 222 steel GB/T 223.5 Determination of acid-dissolved silicon and total silicon content - Reducing silyl molybdate spectrophotometric method GB/T 223.11 Determination of chromium content in steels and alloys - either titration or potentiometric titration GB/T 223.12 Methods for chemical analysis of steels and alloys - Sodium carbonate separation - Diphenylcarbonyl hydrazide photometric method GB/T 223.14 Methods for chemical analysis of steels and alloys - Determination of vanadium content by extraction spectrophotometric method GB/T 223.17 Methods for chemical analysis of steels and alloys - Determination of titanium content by diantipyrylmethane photometric method GB/T 223.19 Methods for chemical analysis of steels and alloys - s. GB/T 223.23 Determination of nickel content in steels and alloys - succinimide spectrophotometric method GB/T 223.26 Determination of molybdenum content of steels and alloys - thiocyanate spectrophotometric method GB/T 223.27 Determination of molybdenum content by thiocyanate acetate extraction spectrophotometric method GB/T 223.37 Methods for chemical analysis of steels and alloys - Distillation separation GB/T 223.40 Determination of bismuth content of steels and alloys - chlorosulfonol S spectrophotometric method GB/T 223.49 Methods for chemical analysis of steels and alloys - Extraction separation - chlorophosphonazo mA spectrophotometric method GB/T 223.59 Methods for chemical analysis of iron and steel - Determination of phosphorus content GB/T 223.63 Determination of manganese content by sodium periodate (potassium) photometric method GB/T 223.85 Determination of sulfur content of steel and alloys - Infrared absorption method after induction furnace combustion GB/T 223.86 Determination of total carbon content of steels and alloys - Infrared absorption method after induction furnace combustion GB/T 228.1 tensile testing of metallic materials - Part 1 GB/T 232 metal material bending test method GB/T 1499.2 Steel for reinforced concrete - Part 2. Hot rolled ribbed bars General provisions for GB/T 2101 steel acceptance, packaging, marking and quality certificates GB/T 4336 Determination of multi-element content of carbon steel and medium-low alloy steels by spark discharge atomic emission spectrometry (conventional method) General technical requirements for the delivery of GB/T 17505 steel and steel products GB/T 20066 Sampling and sample preparation method for samples for determination of chemical composition of steel and iron GB/T 20123 Determination of total carbon and sulfur content of steels - Infrared absorption method after high-frequency induction furnace combustion (conventional method) GB/T 20124 Determination of nitrogen content of irons - Insulating gas fusion heat conduction method (conventional method) GB/T 20125 Determination of multi-elements of low-alloy steels by inductively coupled plasma atomic emission spectrometry GB/T 28900 steel test method for reinforced concrete Numerical correction of YB/T 081 metallurgical technical standard and determination of test value YB/T 4367 Corrosion test method for steel bars in chloride ion environment YB/T 4368 steel bar corrosion test method in industrial atmosphere Test method for resistance to chloride ion corrosion of concrete in concrete with YB/T 4369 YB/T 5126 steel bar bending and reverse bending test method for reinforced concrete JGJ18 steel bar welding and acceptance procedures JGJ/T 27 Standard Test Method for Steel Welded Joints JGJ107 Technical Specification for Mechanical Connection of Rebar3 definitionThe following terms and definitions as defined in GB/T 1499.2 apply to this document. 3.1 Corrosion resistant steel corrosionresistancebars According to different types of steel use environment, such as industrial atmospheric corrosion environment, chloride ion corrosion environment, add appropriate amount of corrosion resistance to steel Alloying elements such as Cu, P, Cr, Ni, Mo, RE, etc., which have corrosion resistance and are delivered in accordance with hot rolling or controlled rolling and controlled cooling. 4 classification, grade 4.1 Rebar is divided into 400 and 500 grades according to the yield strength characteristic value. According to the use environment of steel bars, it is divided into industrial atmospheric corrosion resistant steel bars and chlorine resistant Ion corrosion of steel bars. 4.2 The composition of the steel grade and its meaning are shown in Table 1. Table 1 Category brand number constitutes the meaning of English letters Resistant to industrial atmospheric corrosion HRB400a HRB500a HRB yield strength eigenvalue HRB400aE HRB500aE HRB yield strength eigenvalue a E HRB-hot rolled ribbed steel in English (HotroledRibbed Bars) abbreviation. A-resistant to atmospheric corrosion (atmosphericcorrosion) Resistance) The initials of "atmospheric". E-"Earthquake" in English (Earthquake) initials Chloride resistant corrosion resistant steel HRB400c HRB500c HRB yield strength eigenvalue HRB400cE HRB500cE HRB yield strength eigenvalue c E HRB-hot rolled ribbed steel in English (HotroledRibbed Bars) abbreviation. C-resistant to chloride ion corrosion (chloridecorrosion) Resistance) The first letter of "chloride". E-"Earthquake" in English (Earthquake) initials5 Ordering contentContracts ordered in accordance with this standard shall include at least the following. a) the standard number; b) product name; c) steel grade; d) nominal diameter, length and weight (or quantity, or weight) of the reinforcement; e) Special requirements. 6 Dimensions, shape, weight and tolerance The size, shape, length, bending and end, weight and allowable deviation of the steel bar shall comply with the provisions of GB/T 1499.2.7 Technical requirements7.1 Grades and chemical composition 7.1.1 The steel grade and chemical composition (melting analysis) shall comply with the requirements of Table 2. Add elements such as V, Nb, and Ti as needed. Table 2 Brand Chemical composition (mass fraction) /% C Si Mn PS Cu Cr Ni HRB400a HRB400aE HRB500a HRB500aE HRB400c HRB400cE HRB500c HRB500cE ≤0.21 ≤0.80 ≤1.60 0.060~0.150 ≤0.030 ≤0.030 0.20~0.60 - - - 0.25~7.0 ≤0.65 7.1.2 In order to further improve the corrosion resistance of the steel bar, one or more of the following alloying elements may be added. Mo≤0.30%, RE ≤ 0.05% and the like. 7.1.3 The nitrogen content of the steel should not exceed 0.012%. If the supplier can guarantee that it can be analyzed. If there is a sufficient amount of nitrogen-binding elements in the steel, The limitation of nitrogen content can be appropriately relaxed. 7.1.4 The allowable deviation of the chemical composition of the finished steel bar shall comply with the provisions of GB/T 222. 7.2 Smelting method The steel is smelted by a converter or an electric furnace. 7.3 Delivery status and delivery type 7.3.1 Steel bars are delivered in hot rolled or controlled rolling and controlled cooling conditions. 7.3.2 Steel bars are usually delivered in straight bars, and bars with a diameter of not more than 16 mm can also be delivered in coils. 7.4 Mechanical properties 7.4.1 Lower yield strength of steel bars ReL, tensile strength Rm, elongation after fracture A, total elongation under maximum force Agt, etc. Should comply with the provisions of Table 3. The mechanical property characteristic values listed in Table 3 can be used as the guaranteed value of the delivery inspection. 7.4.2 The elongation at break of the nominal diameter of 28mm~40mm steel bars can be reduced by 1% (absolute value); the nominal diameter is greater than The elongation at break A of 40mm steel bars can be reduced by 2% (absolute value). 7.4.3 For steel bars without obvious yield, the lower yield strength characteristic value ReL shall be the specified plastic elongation strength Rp0.2. table 3 Brand Lower yield strength ReL MPa tensile strength Rm MPa Elongation after break Maximum force Elongation Agt R°m/R°eL R°eL/ReL Not less than not greater than HRB400a HRB400c HRB400aE HRB400cE 16 7.5 - - - 9.0 1.25 1.30 HRB500a HRB500c HRB500aE HRB500cE 15 7.5 - - - 9.0 1.25 1.30 Note. R°m is the measured tensile strength of the steel bar; R°eL is the measured yield strength of the steel bar. 7.4.4 The elongation type can be selected from A or Agt, but Agt should be used for arbitration testing. 7.5 Process performance 7.5.1 Bending performance The steel bars should be subjected to a bending test. After bending the diameter of the bending head according to Table 4, the surface of the steel bar shall not be generated. crack. Table 4 is in millimeters Brand nominal diameter d bending head diameter HRB400a HRB400c HRB400aE HRB400cE 6~25 4d 28~40 5d >40~50 6d HRB500a HRB500c HRB500aE HRB500cE 6~25 6d 28~40 7d >40~50 8d 7.5.2 Reverse bending performance 7.5.2.1 Reverse bending tests shall be carried out on steel bars with grade E. After the reverse bending test, the surface of the steel bar subjected to bending shall not be produced. crack. 7.5.2.2 According to the requirements of the purchaser, other grades of steel bars may also be subjected to a reverse bending test. 7.5.2.3 The bending test may be replaced by a reverse bending test. 7.5.2.4 The bending head diameter of the reverse bending test is increased by a nominal diameter of the steel bar corresponding to the bending test. 7.6 Other requirements Fatigue performance, grain size and surface quality shall comply with the provisions of GB/T 1499.2. 7.7 Connection performance 7.7.1 It is recommended to use mechanical connection for steel bars. The mechanical connection joints should be made of alloy materials with the same corrosion resistance grade as steel bars, and press JGJ107. Test the joint. 7.7.2 If the welding connection method is used, the welding process shall be determined by the supplier and the buyer through consultation, and the welding material with the same corrosion resistance grade shall be used. The material was welded and tested in accordance with JGJ/T 27 and JGJ18. 7.8 Corrosion resistance 7.8.1 Corrosion resistance test of steel bars, resistance to industrial atmospheric corrosion of steel bars in accordance with YB/T 4368, resistance to chloride ion corrosion resistant steel bars YB/T 4367 was tested. Chloride-resistant corrosion-resistant steel bars can also be inspected according to YB/T 4369 according to the needs of both the supplier and the buyer. 7.8.2 The relative corrosion rate of steel bars is calculated by equation (1). The steel bar is compared with the HRB400 brand in GB/T 1499.2, and the relative corrosion rate is low. At 70%. Relative corrosion rate = Average corrosion rate of corrosion-resistant steel bars Average corrosion rate of ordinary steel bars Total length of sample × theoretical weight × 100% (1)8 test methods8.1 Inspection items 8.1.1 The inspection items, sampling quantities, sampling methods and test methods for each batch of steel bars shall comply with the requirements of Table 5. table 5 Serial number test item sampling quantity sampling method test method chemical composition (melting analysis) 1 / furnace GB/T 20066 GB/T 223, GB/T 4336, GB/T 20123, GB/T 20124, GB/T 20125 2 Stretching 2 different root (disk) steel bars to cut GB/T 228.1, 8.2 3 Bending 2 different root (disk) steel bars to cut GB/T 232, 8.2 4 Reverse bending 1 optional 1 (disc) steel bar to cut YB/T 5126, 8.2 5 size by item - 8.3 6 surface by side - visual 7 Weight deviation 8.4 8.4 When there are disputes about the results of chemical analysis and tensile tests, the arbitration tests are carried out according to GB/T 223 and GB/T 228.1 respectively. 8.1.2 Corrosion resistance, joint performance, and fatigue performance are only type tested, that is, only major changes in raw materials, production processes, equipment, and new The product is inspected at the time of production. The type inspection sampling method and test method shall comply with the provisions of Table 6. Table 6 Serial number test item sampling quantity/sampling method test method 1 Corrosion resistance YB/T 4367, YB/T 4368, YB/T 4369 2 Connection performance JGJ107, JGJ18, JGJ/T 27 3 Fatigue performance 5 different root (disk) steel cut GB/T 28900 8.2 Tensile, bending and reverse bending tests 8.2.1 Tensile, Bending, and Reverse Bending Test specimens are not allowed to be turned. 8.2.2 Calculate the strength of the steel bar The cross-sectional area shall be the nominal cross-sectional area listed in GB/T 1499.2-2007. 8.2.3 The test of the total elongation Agt under maximum force may be used in addition to the relevant test method of GB/T 228.1 as specified in Table 5. The method specified in GB/T 28900. 8.2.4 The reverse bending test shall be carried out in accordance with the following provisions. a) In the reverse bending test, the sample after positive bending shall be kept at a temperature of 100 °C ± 10 °C for not less than 30 min. After cooling, bend back in reverse. When the supplier can guarantee the reverse bending performance of the steel bar after artificial aging, the sample after the forward bending Reverse bending can also be performed directly at room temperature. b) Reverse bending test. first bend 90° in the forward direction and then bend 20° in the reverse direction. Both bending angles should be measured while maintaining the load. 8.3 Dimensional measurement 8.3.1 The inner diameter of the steel bar shall be measured to the nearest 0.1 mm. 8.3.2 The measurement of the height of the longitudinal ribs and transverse ribs of the steel bars shall be carried out by measuring the average value of the center heights of the transverse ribs on both sides of the same section. Large outer diameter, minus the inner diameter of the place, half of the value obtained is the height of the rib, which should be accurate to 0.1mm. 8.3.3 The transverse rib spacing of the steel bars is measured by measuring the average rib distance. That is, the first and eleventh transverse ribs on one side of the reinforcing bar are measured. Center distance, the value divided by 10 is the transverse rib spacing, should be accurate to 0.1mm. 8.3.4 Reinforcement transverse rib end gap measurement product chord length between two ends of two adjacent transverse ribs projected perpendicular to the plane of the steel bar axis, measured The quantity diagram is shown in Figure 1. Description. Fi---The end of the transverse rib gap. Figure 1 Schematic diagram of the measurement of the gap at the end of the transverse rib 8.4 Measurement of weight deviation 8.4.1 When measuring the weight deviation of the steel bar, the sample shall be taken from different root steel bars, the quantity shall be not less than 5, and the length of each sample shall not be less than 500mm. The length should be measured one by one and should be accurate to 1mm. When measuring the total weight of the sample, it should be accurate to not more than 1% of the total weight. 8.4.2 The deviation (%) of the actual weight of the steel bar from the theoretical weight is calculated according to formula (2). Weight deviation = Actual total weight of the sample - (total length of the sample × theoretical weight) Total length of sample × theoretical weight (2) 8.5 Numerical repair The numerical repair and judgment of the test results shall comply with the provisions of YB/T 081.9 Inspection rulesThe inspection of corrosion-resistant steel bars is divided into eigenvalue inspection and delivery inspection. 9.1 eigenvalue test 9.1.1 The eigenvalue test applies to the following situations. a) Supplier's inspection of product quality control; b) The request by the acquirer is subject to the agreement of the agreement between the supplier and the buyer; c) Third-party product certification and arbitration testing. 9.1.2 The eigenvalue test shall be carried out in accordance with the provisions of GB/T 1499.2-2007. 9.2 Delivery inspection 9.2.1 Scope of inspection The delivery inspection is applicable to the inspection of the acceptance of the steel bar. 9.2.2 Group Approval Rules 9.2.2.1 Rebar should be inspected and accepted in batches. Each batch consists of the same grade, the same tank number, and the same specification of steel. Weight per batch Usually no more than 60t. For a portion over 60t, for each additional 40t (or less than 40t), add a tensile test specimen and a bend Test sample. 9.2.2.2 Allow mixed batches of different furnace numbers from the same grade, the same smelting method, and the same casting method, but the carbon content of each furnace t......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 33953-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 33953-2025_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.Question 2: Can I share the purchased PDF of GB/T 33953-2025_English with my colleagues?Answer: Yes. 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