GB/T 31940-2025 English PDFUS$839.00 · In stock
Delivery: <= 6 days. True-PDF full-copy in English will be manually translated and delivered via email. GB/T 31940-2025: Bi-metal composite steel pipes for fluid transportation Status: Valid GB/T 31940: Historical versions
Basic dataStandard ID: GB/T 31940-2025 (GB/T31940-2025)Description (Translated English): Bi-metal composite steel pipes for fluid transportation Sector / Industry: National Standard (Recommended) Classification of Chinese Standard: H48 Classification of International Standard: 77.140.75 Word Count Estimation: 42,480 Date of Issue: 2025-08-01 Date of Implementation: 2026-02-01 Older Standard (superseded by this standard): GB/T 31940-2015, GB/T 32958-2016 Issuing agency(ies): State Administration for Market Regulation, Standardization Administration of China GB/T 31940-2025: Bi-metal composite steel pipes for fluid transportation---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/GBT31940-2025ICS 77.140.75 CCSH48 National Standard of the People's Republic of China Replaces GB/T 31940-2015, GB/T 32958-2016 Bimetallic composite steel pipe for conveying fluid Released on August 1, 2025 Implementation on February 1, 2026 State Administration for Market Regulation The National Standardization Administration issued Table of ContentsPreface III 1 Scope 1 2 Normative references 1 3 Terms and Definitions 3 4 Symbols and abbreviations 3 5 Classification and Code 4 6 Order Content 4 7 Manufacturing Process 5 8 Technical Requirements 5 9 Test Methods 15 10 Inspection Rules 16 11 Labeling, packaging, storage and quality certificate 17 Appendix A (Normative) Additional requirements for composite steel pipes for onshore oil and gas transportation, oil well gathering and chemical pipelines 18 Appendix B (Informative) Calculation of the specified values of tensile properties of composite steel pipes 25 Appendix C (Normative) Bimetallic Composite Pipe Fittings 26 Appendix D (Informative) Outer diameter and wall thickness of threaded and grooved composite steel pipes Appendix E (Normative) Test Method for Interface Shear Bond Strength of Lined Composite Steel Pipe 33 Appendix F (Normative) Residual Compressive Stress Test Method 35 Appendix G (Normative) Test method for corrosion resistance of interfaces 36 Appendix H (Normative) Hot and cold cycle performance test method 37 Preface This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1.Structure and drafting rules for standardization documents" Drafting. This document replaces GB/T 31940-2015 "Bimetallic Composite Corrosion-Resistant Steel Pipe for Fluid Transportation" and GB/T 32958-2016 "Fluid Stainless steel composite steel pipe for transportation. This document is based on GB/T 31940-2015 and integrates the content of GB/T 32958-2016. Compared with GB/T 31940-2015, in addition to structural adjustments, content integration and editorial changes, the main technical content changes are as follows. a) The scope of application has been changed (see Chapter 1, Chapter 1 of the.2015 edition); b) Added symbols and abbreviations (see Chapter 4); c) Added classification and code (see Chapter 5); d) The order content has been changed (see Chapter 6, Chapter 4 of the.2015 edition); e) The requirements for composite processing have been changed (see 7.1.1, 7.1.2, and 6.2.1 and 6.2.2 of the.2015 edition); f) The material grade and chemical composition requirements have been changed (see 8.1, 6.1 of the.2015 edition), and the welding material requirements have been added (see 8.1.5); g) The flattening test requirements for high-frequency welded steel pipes have been deleted (see 6.6.2.1 of the.2015 edition); h) Added requirements for shear bond strength and residual compressive stress of the lined composite steel pipe section (see 8.4 and 8.5); i) Added negative pressure test requirements (see 8.6); j) The hydraulic test requirements have been changed (see 8.7, 6.9 of the.2015 edition); k) Added terminal and interface performance requirements (see 8.8); l) The non-destructive testing requirements have been changed (see 8.9, 6.10 and Appendix B of the.2015 edition); m) Added hygienic performance requirements (see 8.10); n) Added external anti-corrosion consultation requirements (see 8.11.4); o) Added the outer diameter size series value and outer diameter selection value (see 8.12.1) and the thread and groove connection complex in water supply and drainage, water conservancy projects The outer diameter and wall thickness of the steel pipe (see Appendix D); p) Changed the requirements for out-of-roundness (see 8.12.2, 5.4 of the.2015 edition) and pipe end bevel requirements (see 8.12.5.1,.2015 edition). 5.5.2) Groove requirements (see 8.12.5.2, 5.5.1 of the.2015 edition); q) Added the requirements for the allowable deviation between actual weight and theoretical weight (see 8.12.6); r) Added collapse test requirements (see Appendix A, Appendix A of the.2015 edition); s) Added Appendix C, Appendix E, Appendix F, Appendix G, and Appendix H. Please note that some of the contents of this document may involve patents. The issuing organization of this document does not assume the responsibility for identifying patents. This document was proposed by the China Iron and Steel Association. This document is under the jurisdiction of the National Technical Committee on Steel Standardization (SAC/TC183). This document was drafted by. Jiangsu Zhongxin Green Pipe Technology Co., Ltd., Zhejiang Jinzhou Pipe Industry Co., Ltd., Shaoxing Shuilian Pipe Industry Co., Ltd., Zhejiang Jiuli Special Materials Technology Co., Ltd., Steel Research Institute Nake Testing Technology Co., Ltd., Zhangjiagang Shagang Jinzhou Pipeline Co., Ltd. Co., Ltd., Zhejiang Taifu Seamless Steel Pipe Co., Ltd., Xi'an Xiangyang Aerospace Materials Co., Ltd., Shanxi Taigang Stainless Steel Pipe Co., Ltd., Zhejiang Dewei Stainless Steel Pipe Co., Ltd., ZTE Energy Equipment Co., Ltd., Jiangsu Xinpeng Composite Materials Co., Ltd., Jiangsu Xinyangguang Pipe Technology Co., Ltd., Jiangsu Product Quality Supervision and Inspection Institute (National Engineering Composite Material Product Quality Inspection and Testing Center), Jiangsu Jierun Pipe Technology Co., Ltd., Jiangsu Shunlong Pipe Technology Co., Ltd., China Railway Nine Bridge Engineering Co., Ltd., Nanjing Water Group Co., Ltd., Yongkang Qianjiang Water Co., Ltd., Jiangsu Urban Water Supply and Drainage Monitoring Co., Ltd., Yichang Limin Pipe Technology Co., Ltd., Xi'an Special Equipment Inspection and Testing Institute, Metallurgical Industry Information Standards Research Institute. The main drafters of this document are. He Zhongchen, Qian Lezhong, Yang Weifang, Chen Tingjie, Xia Zhengwen, Luo Jing, Wang Xing, Wang Zheng, Li Huajun, Wang Bowen, Zhang Linrong, Qiu Yunlong, Chen Weifeng, Zhao Jun, Zhu Xiaolin, Yao Tongyi, Jiang Tianfeng, Jiang Hengxin, Wang Suhong, Chen Hui, Chen Yu, Li Zhonghua, Lu Yuan, Li Qi, Chen Xiang, Wang Zunsheng, He Jianjiang, Yan Junjie, Li Zimo, Zhang Bing, Li Qiang, Shen Chenxia, Zhu Weifei, Zhou Yang, Chen Yuming, Bai Xuechao, You You, Zhang Jin, Bi Cheng, Lü Yongchao, Jia Xin, Xue Jianzhong, and Kang Cairong. The previous versions of the documents replaced by this document are as follows. --- GB/T 31940, first issued in.2015 as GB/T 31940-2015, this is the first revision; ---GB/T 32958, first published in.2016 as GB/T 32958-2016, this is the first revision. Bimetallic composite steel pipe for conveying fluid1 ScopeThis document specifies the classification and code, ordering content, manufacturing process, and specifications of bimetallic composite steel pipes for conveying fluids (hereinafter referred to as composite steel pipes). Process, technical requirements, test methods, inspection rules, marking, packaging, storage and quality certificate. This document is applicable to composite steel pipes used to transport domestic water, fire water, air conditioning water, recycled water, sewage and waste water, as well as water conservancy projects. Composite steel pipes for pipeline engineering, transportation of steam, gas, air, etc. and composite steel pipes for onshore oil and gas transportation, oil well gathering and transportation, and chemical pipelines.2 Normative referencesThe contents of the following documents constitute the essential clauses of this document through normative references in this document. For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to This document. GB/T 222 Permissible deviations of chemical composition of finished steel products GB/T 228.1 Tensile tests on metallic materials - Part 1.Room temperature test methods GB/T 229 Charpy pendulum impact test method for metallic materials GB/T 241 Hydraulic test method for metallic pipes GB/T 246 Flattening test method for metallic tubes GB/T 700 Carbon Structural Steel GB/T 983 Stainless steel welding rods GB/T 1591 Low alloy high strength structural steel GB/T 2102 Acceptance, packaging, marking and quality certificate of steel pipes GB/T 2651 Destructive tests on welds of metallic materials - Transverse tensile tests GB/T 2653 Bend test method for welded joints GB/T 2828.1 Sampling procedures for inspection by attributes Part 1.Sampling plans for batch inspection based on acceptance quality limit (AQL) GB/T 2975 Sampling location and specimen preparation for mechanical property tests on steel and steel products GB/T 3091 Welded steel pipes for low-pressure fluid transportation GB/T 3287 Malleable cast iron pipe fittings GB/T 4334 Corrosion of metals and alloys - Test method for intergranular corrosion of austenitic and ferritic-austenitic (duplex) stainless steels GB/T 4336 Carbon steel and medium and low alloy steel - Determination of multi-element content - Spark discharge atomic emission spectrometry (conventional method) GB/T 4340.1 Metallic materials Vickers hardness test Part 1.Test method GB/T 5117 Welding rods for non-alloy steel and fine grain steel GB/T 5118 Heat-resistant steel welding rods GB 5135.11 Automatic sprinkler systems Part 11.Grooved pipe fittings GB/T 5293 Classification requirements for solid welding wires, flux-cored welding wires and wire-flux combinations for non-alloy steel and fine-grained steel for submerged arc welding GB/T 5310 Seamless steel tubes for high-pressure boilers GB/T 5777 Full circumferential automatic ultrasonic testing of seamless and welded (except submerged arc welded) steel for longitudinal and/or transverse imperfections GB/T 6396 Test methods for mechanical and process properties of composite steel plates GB/T 7306.2 55° sealing pipe threads Part 2.Conical internal threads and conical external threads ......Tips & Frequently Asked Questions:Question 1: How long will the true-PDF of GB/T 31940-2025_English be delivered?Answer: Upon your order, we will start to translate GB/T 31940-2025_English as soon as possible, and keep you informed of the progress. 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