GB/T 6723-2017Cold forming open section steel for general structure (English PDF)

Foreword

This Standard was drafted in accordance with the rules given in GB/T

1.1-2009.

This Standard replaces GB/T 6723-2008, Cold forming sectional steel - Open

sectional steel for general structure - Size, shape, weight and permissible

tolerances. Compared with GB/T 6723-2008, the main changes in this

Standard are as follows.

- modify the standard's name;

- add the order content;

- add the product specifications;

- add equal curling angle steel;

- add technical requirements.

This Standard was proposed by China Iron and Steel Industry Association.

This Standard shall be under the jurisdiction of National Technical Committee

183 on Iron and Steel of Standardization Administration of China (SAC/TC

183).

The drafting organizations of this Standard. Metallurgical Industry Information

Standards Institute, Wuhan Iron and Steel Jiangbei Group Co., Ltd., Shanxi

Dingrong Cold-forming Steel Co., Ltd.

The drafters of this Standard. Wang Yujie, Zhu Shaowen, Sheng Zhenjian,

Song Yuguang, Liu Baoshi.

The previous versions of the standards which are replaced by this Standard

are.

- GB/T 6723-1986, GB/T 6723-2002, GB/T 6723-2008.

Cold forming open section steel for general structure

1 Scope

This Standard specifies the order content, classification, code, section size

and allowable deviation, length and allowable deviation, shape, technical

requirements, weight and marking examples of cold forming open section

steel for general structure.

This Standard is applicable to cold forming open section steel (hereinafter

referred to as section steel) which is produced on continuous roll cold

bending unit by cold-rolled or hot-rolled steel sheets.

2 Normative references

The following documents are indispensable for the application of this

document. For dated references, only the dated version applies to this

document. For undated references, the latest edition (including all

amendments) applies to this document.

GB/T 6725, General requirements of cold forming steel sections

3 Order content

The contract or order in accordance with this Standard shall include the

following contents.

4 Classification and code

The section steels, according to their cross-section shapes, are divided into 9

types, and their codes are.

5 Cross-section size and allowable deviation

1 ~ Figure 9.

6 Length and allowable deviation

7 Shape

8 Technical requirements

The designation and chemical composition (melting analysis), mechanical

property, process performance, surface quality, etc. of the section steel shall

meet the requirements of GB/T 6725.

9 Weight

Section steels can be delivered according to the actual weight and the

theoretical weight.

10 Marking examples

A cold forming inside curling channel steel, that is made of designation-Q345

with a height of 160 mm, a middle-leg side-length of 60 mm, a small-leg

side-length of 20 mm, and a wall thickness of 3 mm, is marked as.

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