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GB/T 714-2015: Structural steel for bridge Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 714: Historical versions
Similar standardsGB/T 714-2015: Structural steel for bridge---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT714-2015ICS 77.140.50 H 46 GB NATIONAL STANDARD Replacing GB/T 714-2008 Structural steel for bridge Issued on. SEPTEMBER 11, 2015 Implemented on. JUNE 01, 2016 Issued by. General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of PRC. Table of ContentsForeword... 3 1 Scope... 5 2 Normative references... 5 3 Terms and definitions... 8 4 Designation presentation method... 8 5 Order content... 9 6 Size, shape, mass and allowable deviation... 10 7 Technical requirements... 10 8 Test methods... 17 9 Inspection rules... 18 10 Packaging, marking and quality certificate... 19 APPENDIX A (Informative) Designation comparison of relevant standard... 20 APPENDIX B (Informative) Recommended yield strength ratio of steel... 21 Appendix C (Informative) Guidance for the assessment of atmospheric corrosion resistance of weathering bridge steels... 22ForewordThis standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 714-2008 “Structural steel for bridge”. As compared with GB/T 714-2008, the main technical changes are as follows. - INCREASE the thickness range to 150 mm; - ADD the terms and definitions (SEE Chapter 3); - CANCEL the Q235q steel designation (SEE 2008 version); - Based on the different delivery status, respectively SPECIFY the chemical compositions of the steel of different designations; - CONTROL stricter the P, S and N element in the chemical composition, and ADD the requirements of H element (SEE Table 1 ~ Table 5); - ADD the technical requirements for the quality class F of Q420q and above designation steel (SEE Table 1, Table 3, Table 4, Table 5, Table 8); - CHANGE the defective part of the strip which shall not exceed 8% of the total length of each coil of strip into not exceeding 6%; - ADD the yield strength ratio of the recommended steels in Appendix B (informative); - ADD Appendix C (informative) for the guidance of the weathering resistance assessment for bridge steels. This standard was proposed by China Iron and Steel Association. This standard shall be under the jurisdiction of National Steel Standardization Technical Committee (SAC/TC 183). The main drafting organizations of this standard. Anshan Iron and Steel Group Corporation, Metallurgical Industry Information Standards Research Institute, Tianjin Iron and Steel Group Co., Ltd., Xinyu Iron and Steel Co., Ltd., Jiangsu Shagang Group Co., Ltd., Nanyang Hanye Special Steel Co., Ltd., Hunan Valin Xiangtan Iron & (Group) Co., Ltd., Fujian Sanming Iron and Steel Group Co., Ltd., Hebei Iron and Steel Co., Ltd. Handan Branch, Wuhan Iron and Steel Co., Ltd., Shougang Corporation. The main drafters of this standard. Liu Xuyuan, Hou Huaxing, Zhang Weixu, Li Bingyi, Zhao Heming, Huang Zhengyu, Xu Shaopu, Cao Zhiqiang, Liu Jianfeng, Yan Zhangguo, Zeng Ping, Shi Li, Xu Wei, Sun Guoqing, Xiong Wenming, Li Xiaobo, Li Xiaoli, Yang Ying, Wang Houxin. This Standard replaces the standard previously issued as follows. - GB/T 714-1965, GB/T 714-2000, GB/T 714-2008. Structural steel for bridges1 ScopeThis standard specifies the terms and definitions, the designation presentation methods, the order content, dimensions, shape, mass and allowable tolerances, technical requirements, test methods, inspection rules, packaging, marking and quality certificates of the structural steel for bridge. This standard is applicable to the structural steel sheets of the thickness not more than 150 mm, the structural steel strips and shear steel sheets of the thickness not more than 25.4 mm for bridges, AND the structural steel of the thickness not more than 40 mm for bridges.2 Normative referencesThe following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this standard. 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 molybdo-silicate spectrophotometric 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 223.19 Methods for chemical analysis of iron, steel and alloy - The neocuproin-hydrochlorid monnohydrat trichloromethane extraction photometric method for the determination of copper content; GB/T 223.23 Iron and steel alloys - 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 223.62 Methods for chemical analysis of iron, steel and alloy - The butyl acetate extraction photometric method for the determination of phosphorus content;3 Terms and definitionsThe following terms and definitions apply to this document. 3.1 Normalizing It refers to the heat treatment process in which the heated and austenitized steel is cooled in the air or other media to obtain the target steel mainly containing pearlite. 3.2 Thermomechanical rolling It refers to, within the certain temperature range, the rolling process for final deformation, after which the materials can be subjected to accelerated cooling and tempering treatment, resulting in that the material properties and conditions cannot be obtained or reproduced only by heat treatment.4 Designation presentation methodThe designation of the steel is composed of the Chinese phonetic alphabet representing the yield strength, the specified minimum yield strength value, the first letter of the Chinese phonetic alphabet of the bridge character, the quality grade symbol, and so on.5 Order contentWhen ordering, the buyer shall provide the following information in the contract or order.6 Size, shape, mass and allowable deviation6.1 The size, shape, mass and allowable deviation of steel sheet shall comply with the provisions of GB/T 709. 6.2 The size, shape, mass and allowable deviation of steel strip and its cut sheet shall comply with the provisions of GB/T 709.7 Technical requirements7.1 Designation and chemical composition 7.1.1 The designation and chemical composition of steel at different delivery status (melting analysis) shall comply with the provisions of Table 1 ~ Table 5. 7.1.2 The carbon equivalent value (CEV) of the steel of different designations shall comply with the requirements in Table 6. 7.4 Mechanical properties 7.4.1 The mechanical properties of steel shall comply with the requirements in Table 8. 150 mm 7.4.3 As for the steel sheet not less than 12 mm of thickness, the Charpy (V-notch) impact test shall be conducted on the auxiliary sample. 7.7 Non-destructive testing As for the single-rolled steel sheet of the thickness more than 20 mm, it shall be subjected to the ultrasonic testing in accordance with the standard GB/T 2970, AND the qualified level shall be not less than level II. The single-rolled steel sheet and other steel materials of other thickness, based on the agreement between the supplier and the buyer, they can also be subjected to the non-destructive testing, AND the test standards and level shall be defined in the agreement or contract. 7.8 Other requirements In accordance with the agreement between supplier and buyer, the steel can also be subjected to the inspection of other items. As for the atmospheric corrosion resistance performance of the weathering bridge steel, SEE Appendix C.8 Test methods8.1 The test methods of the chemical composition of steel shall comply with the provisions of GB/T 223.5, GB/T 223.12, GB/T 223.14, GB/T 223.19, GB/T 223.23, GB/T 223.26, GB/T 223.62, GB/T 223.63, GB/T 223.64, GB/T 223.72, GB/T 223.78, GB/T 223.79, GB/T 223.81, GB/T 223.82, GB/T 223.84, GB/T 223.85, GB/T 223.86, GB/T 4336, GB/T 20123, GB/T 20124, and GB/T 20125. 8.2 The inspection items, sampling quantity, sampling method and test method of steel shall comply with the provisions in Table 10.9 Inspection rules9.1 Inspection and acceptance The inspection and acceptance of the steel products shall be conducted by the technical supervision department of the supplier. 9.2 Batching 9.3 Re-inspection and judgement rules 9.3.1 When the impact test results of steel do not comply with the requirements of 7.4.4, the sampled steel shall not be accepted; RE-TAKE another two sample products from the remaining portion of this test unit, respectively TAKE a group of 3 samples from each product, AND the test results of these two groups of sample shall be qualified; otherwise this batch of steel shall be rejected. 9.4 Rounding off of mechanical properties and chemical composition test results10 Packaging, marking and quality certificateThe packaging, marking and quality certificate of steel shall comply with the provisions of GB/T 247 or GB/T 2101. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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