GB/T 714-2025 PDF English
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GB/T 714: Historical versions
| Standard ID | USD | BUY PDF | Delivery | Standard Title (Description) | Status |
| GB/T 714-2025 | 380 | Add to Cart | Auto, 9 seconds. | Structural steel for bridge | Valid |
| GB/T 714-2015 | 85 | Add to Cart | Auto, 9 seconds. | Structural steel for bridge | Valid |
| GB/T 714-2008 | 479 | Add to Cart | 4 days | Structural steel for bridge | Obsolete |
| GB/T 714-2000 | 399 | Add to Cart | 3 days | Structural steel for bridge | Obsolete |
| GB/T 714-1965 | RFQ | ASK | 3 days | Technical requirements for hot-rolled carbon steels for bridges | Obsolete |
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GB/T 714-2025: 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/GBT714-2025GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 77.140.50 CCS H 46 Replacing GB/T 714-2015 Structural Steel for Bridge Issued on: OCTOBER 31, 2025 Implemented on: MAY 1, 2026 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3 1 Scope... 6 2 Normative References... 6 3 Terms and Definitions... 7 4 Designation Method... 8 5 Ordering Details... 8 6 Manufacturing Process... 9 7 Technical Requirements... 9 8 Test Methods... 18 9 Inspection Rules... 19 10 Packaging, Marking, and Certificate of Quality... 20 11 Recommended Ordering Standards for Other Types of Bridge Steel... 20 Appendix A (Informative) Reference Usage Environment for Bridge Sites Where Atmospheric Corrosion Resisting Steel Can Be Used Without Painting... 21 Appendix B (Informative) Comparison Table of Relevant Standard Designations... 22 Appendix C (Informative) Yield Strength Ratio of Steels... 23 Appendix D (Informative) Ordering Standards for Other Types of Bridge Steel... 24 Bibliography... 25 Structural Steel for Bridge1 Scope
This Document specifies the designation method, ordering details, manufacturing process, technical requirements, test methods, inspection rules, packaging, marking, and quality certificate of structural steel for bridge. This Document applies to single-rolled steel plates for bridge structural steel with a thickness not exceeding 150 mm, and hot-rolled steel strips and sheared steel plates for bridge structural steel with a thickness not exceeding 25.4 mm (hereinafter referred to as steel plates and strips).2 Normative References
The provisions in following documents become the essential provisions of this Document through reference in 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) is applicable to this Document. GB/T 222 Permissible tolerances for chemical composition of steel products GB/T 223 (all parts) Iron, steel and alloy – Methods for chemical analysis GB/T 228.1 Metallic materials - Tensile testing - Part 1.Method of test at room temperature GB/T 229 Metallic materials - Charpy pendulum impact test method GB/T 232 Metallic materials - Bend testing method GB/T 247 General rule of package, mark and certification for steel plates (sheets) and strips GB/T 709 Dimension, shape, weight and tolerance for hot-rolled steel strip plate and sheet GB/T 2970 Method for ultrasonic testing of thicker steel plates GB/T 2975 Steel and steel products - Location and preparation of samples and test pieces for mechanical testing GB/T 4336 Carbon and low-alloy steel - Determination of multi-element contents - Spark discharge atomic emission spectrometric method (routine method) GB/T 5313 Steel plate with through-thickness properties GB/T 8170 Rules of rounding off for numerical values & expression and judgement of limiting values 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 (Routine method) GB/T 20125 Low-alloy steel - Determination of multi-element contents - Inductively coupled plasma atomic emission spectrometric method3 Terms and Definitions
For the purposes of this Document, the following terms and definitions apply. 3.1 Normalizing A heat treatment process in which steel is heated to a suitable temperature above the phase transformation point and then cooled in air to a temperature below certain phase transformation point. 3.2 Thermomechanical rolling It is a rolling process in which the final deformation of steel is carried out within a certain temperature range, thereby ensuring that the steel acquires properties that cannot be obtained through heat treatment alone. NOTE 1.Thermomechanical rolling includes the process of increasing the cooling rate in tempered or non-tempered conditions. Tempering includes self-tempering but excludes direct quenching and quenching followed by tempering. NOTE 2.Also known as TMCP (Thermomechanical Controlled Process), and in some publications as "controlled rolling". 3.3 Quenched and tempered The heat treatment method involves quenching the steel and then tempering it at high temperature. 3.4 Atmospheric corrosion resisting steel Steel that adds certain alloying elements, such as Cr, Ni, Cu, and Mo, and improves its atmospheric corrosion resistance by forming a dense rust layer on the metal matrix surface. NOTE 1.Atmospheric corrosion resisting steel is also called weathering steel, code. NH. NOTE 2.For bridge site reference environments for uncoated applications of atmospheric corrosion resisting steel, see Appendix A.4 Designation Method
The steel designation consists of four parts. the first letter of the pinyin (Qu) for "yield strength", the specified minimum yield strength value, the first letter of the pinyin (qiao) for "bridge", and the quality grade symbol. NOTE 1.Q + specified minimum yield strength value + q, abbreviated as steel grade. EXAMPLE 1.Q420qD. Where. Q - the first letter of the pinyin (Qu) for "yield strength"; 420 - the specified minimum yield strength value, in MPa; q - the first letter of the pinyin (qiao) for "bridge"; D - quality grade D. Bridge steel with weathering resistance properties is designated by adding "weathering" (NH) after the above-mentioned designation. NOTE 2.Q + specified minimum yield strength value + q + NH, also abbreviated as steel grade. EXAMPLE 2.Q420qDNH. NH - the first letter of the pinyin (Nai Hou) for "weathering". When thickness-direction properties are required for steel plates, a symbol representing the thickness-direction (Z-direction) property level (Z15, Z25, Z35) shall be added after the designations specified above, such as Q420qDZ35, Q420qDNHZ35.5 Ordering Details
Contracts or orders placed according to this Document shall include at least the following. a) This Document number; b) Product name; c) Designation; d) Specification; e) Dimensions, shape, and precision requirements; f) Weight (quantity); g) Delivery condition; h) Special requirements.6 Manufacturing Process
6.1 Smelting method Steel is smelted in a converter or electric furnace and subjected to ladle refining treatments such as vacuum degassing. 6.2 Delivery condition Steel shall be delivered in thermomechanical rolling (TMCP), thermomechanical rolling (TMCP) + tempered, or quenched and tempered delivery condition, as indicated in the quality certificate. When the thickness of steel plates of Q345q and Q370q grades is greater than 100mm but no greater than 150mm, delivery in the normalizing condition can be agreed upon by both the supplier and the purchaser.7 Technical Requirements
7.1 Designations and chemical composition 7.1.1 The designations and chemical compositions (smelting analysis) of steels in different delivery conditions shall conform to the provisions of Tables 1 to 5.For designation comparisons in relevant standards, please refer to Appendix B. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
