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GB/T 714-2015 English PDF (GBT714-2015)

GB/T 714-2015 English PDF (GBT714-2015)

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GB/T 714-2015: Structural steel for bridge

This 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.
GB/T 714-2015
ICS 77.140.50
H 46
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
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 contents
Foreword ... 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 ... 22
Foreword
This 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 and (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.
Structural steel for bridges
1 Scope
This 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 references
The 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;
GB/T 223.63 Methods for chemical analysis of iron, steel and alloy - The sodium periodate (potassium) photometric method for the determination of manganese content;
GB/T 223.64 Iron, steel and alloy - Determination of manganese content - Flame atomic absorption spectrometric method;
GB/T 223.72 Steel and alloy - Determination of sulfur content - Gravimetric method;
GB/T 223.78 Methods for chemical analysis of iron, steel and alloy -
Curcumin spectrophotometric method for the determination of boron
content;
GB/T 223.79 Iron and steel - Determination of multi-element content - X-ray fluorescence spectrometry (Routine method);
GB/T 223.81 Iron, steel and alloy - Determination of total aluminium and total boron contents - Microwave digestion-inductively coupled plasma
mass spectrometric method;
GB/T 223.82 Steel and iron - Determination of hydrogen content - Inert gas pulse fusion heat conductivity method;
GB/T 223.84 Steel and iron - Determination of titanium content -
Diantipyrylmethane spectrophotometric method;
GB/T 223.85 Steel and iron - Determination of sulfur content - Infrared absorption method after combustion in induction furnace;
GB/T 223.86 Steel and iron - Determination of total carbon content - Infrared absorption method after combustion in induction furnaces;
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 test;
GB/T 247 General rules of acceptance, package, mark and certification for steel sheets and strips;
GB/T 706 Hot rolled section steel;
GB/T 709 Dimension, shape, weight and tolerances for hot rolled sheets
and strips;
GB/T 2101 General requirements of acceptance packaging marking and
certification for section steel;
GB/T 2970 Method for ultrasonic testing of thicker steel plates
GB/T 2975 Steel and steel products ?€? Location and preparation of 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 plates with through-thickness characteristics;
GB/T 8170 Rules for rounding off for numerical values and expression and
judgement of limiting values;
GB/T 11263 Hot-rolled H and cut T section steel;
GB/T 14977 General requirements for surface condition of hot-rolled steel plates;
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 method;
first letter of the Chinese phonetic alphabet of the bridge character, the quality grade symbol, and so on.
Example. Q420qD. Wherein.
Q - The first letter of the Chinese phonetic alphabet ?€?qu?€? of the yield strength of bridge steel [Translator note. ?€?qu?€? represents ?€?yield strength?€?];
420 - The specified minimum yield strength value, in the unit of MPa;
q - The first letter of the Chinese phonetic alphabet ?€?qiao?€? of the bridge steel [Translator note. ?€?qiao?€? represents ?€?bridge?€?];;
D - The quality grade is D.
As for the grade D steel sheet which is delivered in thermo-mechanical rolling state, if it has the weather resistance and thickness direction properties, then after the aforementioned designation, respectively ADD the performance level code of the weather resistance (NH) and the thickness direction (Z direction). Example. Q420qDNHZ15.
5 Order conten...

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