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GB/T 45779-2025: Welded shaped steel tubes for structure
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 45779-2025 | English | 1489 |
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Welded shaped steel tubes for structure
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GB/T 45779-2025
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Basic data | Standard ID | GB/T 45779-2025 (GB/T45779-2025) | | Description (Translated English) | Welded shaped steel tubes for structure | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | H48 | | Classification of International Standard | 77.140.75 | | Word Count Estimation | 74,779 | | Date of Issue | 2025-06-30 | | Date of Implementation | 2026-01-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 45779-2025: Welded shaped steel tubes for structure---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/GBT45779-2025
ICS 77.140.75
CCSH48
National Standard of the People's Republic of China
Welded special-shaped steel pipes for structures
Released on June 30, 2025
Implementation on January 1, 2026
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
1 Scope 1
2 Normative references 1
3 Terms and Definitions 2
4 Classification and Code 2
5 Order Content 3
6 Manufacturing Process 3
7 Technical Requirements 5
8 Test methods 21
9 Inspection Rules 22
10 Marking, packaging, storage and quality certificate 23
Appendix A (Normative) Cross-sectional shape, size specifications and cross-sectional properties of steel pipes 24
Appendix B (Normative) Steel Pipe Flattening Test Method 60
Appendix C (Normative) Determination of Weight of Zinc Coating - Antimony Chloride Method 62
Appendix D (Normative) Uniformity Test of Galvanized Coating - Copper Sulfate Immersion Method 64
Appendix E (Informative) Calculation of Sectional Properties Formula 65
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.
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. Zhejiang Dewei Stainless Steel Pipe Co., Ltd., Tianjin Youfa Dezhong Steel Pipe Co., Ltd., Zhejiang Jinzhou Pipe
Dao Technology Co., Ltd., Handan Zhengda Pipe Group Co., Ltd., Fujian Qingtuo Special Steel Technology Research Co., Ltd., Guangdong Zhenxiong
Steel Pipe Co., Ltd., Tianjin Yuantai Derun Steel Pipe Manufacturing Group Co., Ltd., and Metallurgical Industry Information Standards Research Institute.
The main drafters of this document are. Xie Yi, Ding Xiuchen, Yang Weifang, Zhang Hongshun, Jiang Laizhu, Wang Fang, Huang Yalian, Li Qi, Mo Peiming, Zhao Fuliang,
Zhong Xuequan, Wang Yuanzhi, Ren Yong, Chen Yao, Shen Chenxia, Chen Zisen, Guo Yong, and Xue Jianzhong.
Welded special-shaped steel pipes for structures
1 Scope
This document specifies the classification and code, ordering content, manufacturing process, technical requirements, test methods, inspection
Regulations, marking, packaging, storage and quality certificates.
This document is applicable to welded special-shaped steel pipes (with
(hereinafter referred to as "steel pipe").
2 Normative references
The 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 223.9 Iron, steel and alloys—Determination of aluminum content—Chrome azurol S spectrophotometric method
GB/T 223.11 Determination of chromium content in steel and alloys - Visual titration or potentiometric titration method
GB/T 223.12 Methods for chemical analysis of iron, steel and alloys - Sodium carbonate separation-diphenylcarbazide photometric method for the determination of chromium content
GB/T 223.14 Chemical analysis of iron, steel and alloys - Tantalum extraction spectrophotometric method for the determination of vanadium content
GB/T 223.18 Methods for chemical analysis of iron, steel and alloys - Sodium thiosulfate separation-iodine titration method for the determination of copper content
GB/T 223.19 Methods for chemical analysis of iron, steel and alloys - Determination of copper content by the new cuproline-chloroform extraction spectrophotometric method
GB/T 223.23 Iron, steel and alloys - Determination of nickel content - Dimethylglyoxime spectrophotometric method
GB/T 223.25 Methods for chemical analysis of iron, steel and alloys - Dimethylglyoxime gravimetric method for the determination of nickel content
GB/T 223.26 Iron, steel and alloys—Determination of molybdenum content—Thiocyanate spectrophotometric method
GB/T 223.28 Methods for chemical analysis of iron, steel and alloys - α-Benzoin oxime gravimetric method for the determination of molybdenum content
GB/T 223.36 Methods for chemical analysis of iron, steel and alloys - Separation by distillation - Neutralization titration method for the determination of nitrogen content
GB/T 223.37 Iron, steel and alloys - Determination of nitrogen content - Indigo blue spectrophotometric method using distillation separation
GB/T 223.40 Iron, steel and alloys - Determination of niobium content - Chlorosulfonylphenol S spectrophotometric method
GB/T 223.53 Chemical analysis of iron, steel and alloys - Flame atomic absorption spectrophotometric method for the determination of copper content
GB/T 223.58 Methods for chemical analysis of iron, steel and alloys - Sodium arsenite-sodium nitrite titration method for the determination of manganese content
GB/T 223.59 Iron, steel and alloys - Determination of phosphorus content - Bismuth phosphomolybdenum blue spectrophotometric method and antimony phosphomolybdenum blue spectrophotometric method
GB/T 223.60 Iron, steel and alloys - Determination of silicon content - Gravimetric method
GB/T 223.62 Methods for chemical analysis of iron, steel and alloys - Determination of phosphorus content - Spectrophotometric method with butyl acetate extraction
GB/T 223.63 Iron, steel and alloys—Determination of manganese content—Sodium (potassium) periodate spectrophotometric method
GB/T 223.64 Iron, steel and alloys - Determination of manganese content - Flame atomic absorption spectrometry
GB/T 223.72 Iron, steel and alloys - Determination of sulfur content - Gravimetric method
GB/T 223.81 Iron, steel and alloy - Determination of total aluminum and total boron content - Microwave digestion-inductively coupled plasma mass spectrometry
GB/T 223.84 Iron, steel and alloys - Determination of titanium content - Diantipyryl methane spectrophotometric method
GB/T 223.85 Iron, steel and alloys - Determination of sulfur content - Infrared absorption method after combustion in an induction furnace
GB/T 223.86 Iron, steel and alloys - Determination of total carbon content - Infrared absorption method after combustion in an induction furnace
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