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GB/T 6728-2025: Cold forming sectional steel for general structure
Status: Valid
GB/T 6728: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivered in | Standard Title (Description) | Status | PDF |
| GB/T 6728-2025 | English | 2199 |
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Cold forming sectional steel for general structure
| Valid |
GB/T 6728-2025
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| GB/T 6728-2017 | English | 145 |
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Cold forming hollow sectional steel for general structure
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GB/T 6728-2017
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| GB/T 6728-2002 | English | 70 |
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Cold formed steel hollow sections for general structure -- Dimensions, shapes, weight and permissible deviations
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GB/T 6728-2002
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| GB/T 6728-1986 | English | 399 |
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Cold forming sectional steel--Hollow sectional steel for general structure--Dimension, form, weight and permissible deviations
| Obsolete |
GB/T 6728-1986
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PDF similar to GB/T 6728-2025
Basic data
| Standard ID | GB/T 6728-2025 (GB/T6728-2025) |
| Description (Translated English) | Cold forming sectional steel for general structure |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | H44 |
| Classification of International Standard | 77.140.70 |
| Word Count Estimation | 110,182 |
| Date of Issue | 2025-08-29 |
| Date of Implementation | 2026-03-01 |
| Older Standard (superseded by this standard) | GB/T 6728-2017, GB/T 6723-2017 |
| Issuing agency(ies) | State Administration for Market Regulation; Standardization Administration of China |
GB/T 6728-2025: Cold forming sectional steel for general 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/GBT6728-2025
ICS 77.140.70
CCSH44
National Standards of the People's Republic of China
Replaces GB/T 6728-2017 and GB/T 6723-2017
cold-formed steel for structural use
Published on 2025-08-29
Implemented on 2026-03-01
State Administration for Market Regulation
The State Administration for Standardization issued a statement.
Table of Contents
Preface III
1.Scope 1
2 Normative References 1
3.Terms and Definitions 1
4.Order details 2
5.Classification and Code 2
6.Technical Requirements 2
6.1 Cross-section, dimensions, and permissible deviations 2
6.2 Length and Permissible Deviation 83
6.3 Appearance 84
6.4 Weight and Permissible Deviations 87
6.5 Grade and Chemical Composition 87
6.6 Raw materials 87
6.7 Manufacturing Process 87
6.8 Mechanical properties 87
6.9 Surface quality 88
6.10 Weld quality 88
6.11 Zinc plating layer 88
7.Test Methods 89
8 Inspection Rules 90
8.1 Inspection and Acceptance 90
8.2 Batching Rules 90
8.3 Re-inspection and Judgment Rules 90
8.4 Rounding off numerical values by 90%
9.Packaging, marking, transportation, storage and quality certificate 90
9.1 Packaging 90
9.2 Mark 91
9.3 Transportation 91
9.4 Storage 91
9.5 Quality Certificate 92
Appendix A (Informative) Formulas for Calculating Section Properties 93
Appendix B (Normative) Permissible Deviation of Wall Thickness for Structural Steel (95%)
Appendix C (Normative) Determination of the Weight of Zinc Plating Coating - Antimony Chloride Method 98
C.1 Sample Preparation 98
C.2 Preparation of test solution 98
C.3 Test Procedure 98
C.4 Test Procedure 98
C.5 Calculation of test results 100
Appendix D (Normative) Test for Uniformity of Zinc Plating Coated Layers. Copper Sulfate Immersion Method 102
D.1 Sample Preparation 102
D.2 Preparation of test solution 102
D.3 Test Container 102
D.4 Test Procedure 102
D.5 Judgment of Test Results 102
Foreword
This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1.Structure and Drafting Rules of Standardization Documents".
Drafting.
This document supersedes GB/T 6728-2017 "Cold-formed hollow steel sections for structural use" and GB/T 6723-2017 "General cold-formed open steel sections".
This document is based on GB/T 6728-2017 and integrates the content of GB/T 6723-2017.Compared with GB/T 6728-2017, except for the conclusion...
Aside from structural adjustments and editorial changes, the main technical changes are as follows.
---Added steel profile dimensions and specifications (see Tables 1, 2, and 3);
---The measurement locations for structural steel sections have been changed (see Tables 5, 6, and 20);
---Added requirements for the out-of-roundness of round steel sections (see Table 24);
---Added requirements for laser cutting or plasma cutting (see 6.3.3);
---The requirements regarding grade and chemical composition have been revised (see 6.5, 9.1 of GB/T 6728-2017);
---A manufacturing process has been added (see 6.7);
---Mechanical performance requirements have been added (see 6.8);
---The weight requirement for the galvanized layer has been changed (see 6.11, 9.2 of GB/T 6728-2017);
---Added rules for re-inspection and judgment of galvanized layer weight (see 8.3);
---The wall thickness tolerance requirements have been changed (see Appendix B, 5.6 of GB/T 6728-2017).
Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.
This document was proposed by the China Iron and Steel Association.
This document is under the jurisdiction of the National Steel Standardization Technical Committee (SAC/TC183).
This document was drafted by. Tianjin Youfa Steel Pipe Group Co., Ltd., Handan Zhengda Steel Pipe Group Co., Ltd., and Tianjin Yuantai De.
Rungang Pipe Manufacturing Group Co., Ltd., Wuhan Iron and Steel Jiangbei Group Cold-Formed Steel Co., Ltd., Foshan Dinglian Steel Pipe Co., Ltd., Foshan San
Shuizhenhong Steel Products Co., Ltd., Laiwu Fangyuan Metal Products Co., Ltd., China Construction Steel Structure Co., Ltd., and Metallurgical Industry Information Standards Research Institute
Research Institute, Shanxi Dingrong Cold-Formed Steel Co., Ltd.
The main drafters of this document are. Li Xiangdong, Li Bingshang, Song Yuguang, Wang Yuanzhi, Liu Kaisong, Ruan Jiangang, Zhao Fuliang, Fan Zhigang, and Ye Zhuolin.
Xing Xiaocheng, Chen Zhenming, Fan Tiezheng, Liu Baoshi, Niu Yun, Guo Yong, Wang Yujie, Xiao Lin, Sheng Zhenjian, Fan Zhiqiang, Zheng Guangquan, Jiang Xiaojie, Xia Linyin
Xu Haochi, Huang Yalian, Guan Zhongchun, Zhai Yongli, Wang Yalin.
The document replaced by this document has been released in the following versions.
---GB/T 6723, first published in 1986, first revised in.2002, and second revised in.2017.
---GB/T 6728, first published in 1986, first revised in.2002, and second revised in.2017.
cold-formed steel for structural use
1.Scope
This document specifies the ordering details, classification, designation, technical requirements, inspection rules, and packaging for cold-formed structural steel sections (hereinafter referred to as steel sections).
The marking, transportation, storage and quality certificate describes the corresponding test methods.
This document applies to general cold-formed open sections (hereinafter referred to as) produced from cold-rolled or hot-rolled steel sheets and strips on continuous roll forming units.
Open-section steel, round, rectangular and square cold-formed closed-section steel (hereinafter referred to as closed-section steel), and also applicable to continuously hot-dip galvanized steel (hereinafter referred to as...)
(Referred to as galvanized steel).
This document does not apply to structural steel formed by cold bending and welding of galvanized steel sheets and strips.
2 Normative references
The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are listed below.
For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.
This document.
GB/T 222 Permissible Deviations in Chemical Composition of Finished Steel and Alloy Products
GB/T 228.1 Metallic materials – Tensile testing – Part 1.Test method at room temperature
GB/T 229 Metallic materials Charpy impact test method
GB/T 470-2008 Zinc Ingots
GB/T 699 High-quality carbon structural steel
GB/T 700 Carbon Structural Steel
GB/T 709 Dimensions, shape, weight and permissible deviations of hot-rolled steel plates and strips
GB/T 714 Structural steel for bridges
GB/T 1591 Low-alloy high-strength structural steel
GB/T 2101 General Provisions for Acceptance, Packaging, Marking and Quality Certificate of Steel Sections
GB/T 2102 Acceptance, Packaging, Marking and Quality Certificate of Steel Pipes
GB/T 2975 Sampling Location and Specimen Preparation for Mechanical Property Testing of Steel and Steel Products
GB/T 3280 Stainless steel cold-rolled sheet and strip
GB/T 4171 Weathering Structural Steel
GB/T 8170 Rules for rounding off numerical values and the representation and determination of limiting values
GB/T 20066 Sampling and Sample Preparation Methods for the Determination of Chemical Composition of Steel and Iron
GB/T 20878 Stainless Steel Grades and Chemical Composition
GB/T 33162 Hot-rolled steel plates and strips for cold-formed steel sections
3.Terms and Definitions
The following terms and definitions apply to this document.
3.1
freeedge
In open-section steel, only one end has a rounded corner (R-angle).
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