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GB/T 6725-2017 English PDF (GBT6725-2017)

GB/T 6725-2017 English PDF (GBT6725-2017)

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GB/T 6725-2017: General requirements of cold forming steel sections

This Standard specifies the order content, classification and code, size, appearance, weight and allowable deviation, technical requirements, test methods, acceptance rules, packaging, marks and quality certificate. This Standard is applicable to cold forming steel produced on continuous roll cold bending unit by cold-processed textured cold-rolled, hot-rolled or coated (plated) steel sheets and strips.
GB/T 6725-2017
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 77.140.70
H 44
Replacing GB/T 6725-2008
General requirements of cold forming steel sections
ISSUED ON. MAY 31, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Order content ... 5
4 Classification and code ... 5
5 Size, appearance, weight and allowable deviation ... 6
6 Technical requirements ... 6
7 Test methods ... 8
8 Acceptance rules ... 9
9 Packaging, marks and quality certificate ... 9
Foreword
This Standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This Standard replaces GB/T 6725-2008 Cold forming steel sections.
Compared with GB/T 6725-2008, the main changes in this Standard are as
follows.
- modified the standard?€?s name;
- modified the strength level;
- modified the designation and composition requirements;
- modified the delivery state;
- modified the mechanical performance requirements;
- added the relevant requirements for plating.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee on Steels of Standardization Administration of China (SAC/TC 183).
The drafting organizations of this Standard. Metallurgical Industry Information Standards Institute, Tianjin Youfa Steeltube Group Co., Ltd., Wuhan Iron and Steel Jiangbei Group Co., Ltd. Cold-forming Steel Co., Ltd., Tangshan
Jinghua Pipe Co., Ltd., Shanxi Dingrong Cold-forming Steel Co., Ltd., Taian Taixing Metal Structure Manufacturing Co., Ltd.
Main drafters of this Standard. Liu Baoshi, Chen Zilin, Zhu Shaowen, Wen Zhaojiang, Yu Qingshui, Zhao Yong, Wang Yujie, Cao Jiyuan, Sheng Zhenjian, Liu Chunlei, Song Yi, Li Juncai, Yu Shubao, Song Yuguang.
Versions of standard substituted by this Standard are.
- GB/T 6725-1986, GB/T 6725-1992, GB/T 6725-2002, GB/T 6725-2008.
General requirements of cold forming steel sections
1 Scope
This Standard specifies the order content, classification and code, size, appearance, weight and allowable deviation, technical requirements, test methods, acceptance rules, packaging, marks and quality certificate.
This Standard is applicable to cold forming steel produced on continuous roll cold bending unit by cold-processed textured cold-rolled, hot-rolled or coated (plated) steel sheets and strips.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 222, Method of sampling steel for determination of chemical
composition and permissible variations for product analysis
GB/T 228.1, Metallic materials - Tensile testing - Method of test at ambient temperature
GB/T 229, Metallic materials - Charpy pendulum impact test method
GB/T 699, Quality carbon structural steels
GB/T 700, Carbon structural steels
GB/T 714, Structural steel for bridge
GB/T 1591, High strength low alloy structural steels
GB/T 2101, General provisions on acceptance, package, marking and
quality certificate for profile steel
GB/T 2518, Continual hot-dip zinc-coated steel sheets and strips
GB/T 2650, Impact test methods on welded joints
GB/T 2651, Tensile test method on welded joints
According to product cross-section shape, it usually uses Pinyin initial(s) that can represent the appearance characteristics of this product, in uppercase letters.
Examples.
Cold forming round hollow steel (round tube for short), Y (or ??) as its code. Cold forming square hollow steel (square tube for short), F as its code. Cold forming rectangular hollow steel (rectangular tube for short), J as its code.
Cold forming deformed hollow steel (deformed tube for short), YI as its code. Cold forming open section steel (open section steel for short), according to the cross-section shape, is divided into JD (equal angle steel), JB (unequal angle steel), CD (equal channel steel), CB (unequal channel steel), CN
(inside curling channel steel), CW (outside curling channel steel), Z
(Z-shaped steel), ZJ (curling Z-shaped steel), YX (cold forming deformed steel).
4.2 Classification of cold forming steel according to yield strength
level
It is usually divided into Q195, Q215, Q235, Q345, Q390, Q420, Q460, Q500, Q550, Q620, Q690, Q750, according to yield strength level.
5 Size, appearance, weight and allowable deviation
The size, appearance, weight and allowable deviation of cold forming steel shall comply with the requirements of GB/T 6723, GB/T 6726, GB/T 6728.
6 Technical requirements
6.1 Designation and chemical composition
6.1.1 The designation and chemical composition (smelting analysis) of cold forming steel shall comply with the requirements of GB/T 699, GB/T 700, GB/T 714, GB/T 1591, GB/T 2518, GB/T 3280, GB/T 3524, GB/T 4171, GB/T
12754, GB/T 33162.
6.1.2 Required by the purchaser and indicated in the contract, the cold forming steel of other designation shall be provided.
6.1.3 The allowable deviation of chemical composition of finished cold

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