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GB/T 6725-2008 English PDF (GBT6725-2008)

GB/T 6725-2008 English PDF (GBT6725-2008)

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GB/T 6725-2008: Cold forming steel sections

This Standard specifies cold forming steel sections in terms of order, classification and code, dimension, shape, weight and permissible deviation, technical requirements, test method, acceptance rules and packaging, marking and quality certificate.
GB/T 6725-2008
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 77.140.70
H 44
Replacing GB/T 6725-2002
Cold Forming Steel Sections
ISSUED ON. AUGUST 19, 2008
IMPLEMENTED ON. APRIL 1, 2009
Issued by. General Administration of Quality Supervision, Inspection and Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
1 Scope ... 4
2 Normative References ... 4
3 Order ... 5
4 Classification and Code ... 5
5 Dimension, Shape, Weight and Tolerance ... 6
6 Technical Requirements ... 6
7 Test Methods ... 7
8 Acceptance Rules ... 8
9 Packaging, Marking and Quality Certificate ... 8
Appendix A (Informative) Comparison table of domestic-foreign common-use material designations of yield strength grade of this Standard?€?s products ... 10 Foreword
This Standard modifies and adopts EN 10219.1-2006 Cold Formed Welded Structural Hollow Sections of Non-Alloy and Fine Grain Steels - Part 1. Technical Delivery Conditions. The main differences are as follows.
?€? Grade and designation of steels follow the standards and designations in China; ?€? Sampling, test method and re-inspection rules follow the relevant national standards.
This Standard replaces GB/T 6725-2002 Cold Formed Steel Sections.
This revision includes the following technical changes.
?€? Normative references are adjusted;
?€? Classification of yield strength of products is added;
?€? Fine grained steel is added;
?€? Assessment indicators for mechanical properties of products are added. Appendix A of this Standard is informative.
This Standard was proposed by China Iron and Steel Association.
This Standard shall be under the jurisdiction of National Technical Committee on Iron and Steel of Standardization Administration of China.
Chief drafting organizations of this Standard. Shanghai Baosteel Construction Engineering Design and Research Institute, Wisco Jiangbei Cold-formed Co., Ltd., Guangzhou Pipe Mill, Foshan Zhida Steel Pipe Manufacture Co., Ltd. AND Shanghai JiaYi Cold-Formed Section Steel Factor.
Chief drafting staffs of this Standard. Yu Hong, Qian Weizhong, Ma Yuefeng, Zhang Xiufang, Li Ye, Zhang Yongqi, Li Jianzhang and Zhang Jing.
The previous editions replaced by this Standard are as follows.
?€? GB/T 6725-1986, GB/T 6725-1992, GB/T 6725-2002.
Cold Forming Steel Sections
1 Scope
This Standard specifies cold forming steel sections in terms of order, classification and code, dimension, shape, weight and permissible deviation, technical requirements, test method, acceptance rules and packaging, marking and quality certificate. This Standard is applicable to cold forming steel sections which are produced by cold-deformed cold-rolled or hot-rolled steel sheet and strip on the continuous roller cold forming units.
2 Normative References
The following standards contain the provisions which, through reference in this Standard, constitute the provisions of this Standard. For dated reference, subsequent amendments to (excluding correction) or revisions of these publications do not apply. However, the parties who enter into agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the standards. For undated references, the latest edition of the normative document referred to applies
GB/T 222 Permissible Tolerances for Chemical Composition of Steel Products GB/T 228 Metallic Materials-Tensile Testing at Ambient Temperature (GB/T 228-2002, eqv ISO 6892.1998(E))
GB/T 229 Metallic Materials-Charpy Pendulum Impact Test Method (GB/T
229-2007, ISO 148-1.2006, MOD)
GB/T 232 Metallic Materials-Bend Test (GB/T 232-1999, eqv ISO
7438.1985(E))
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 Requirement of Acceptance Packaging, Marking and
Certification for Section Steel
GB/T 2975 Steel and Steel Products - Location and Preparation of Test Pieces for Mechanical Testing
GB/T 3280 Cold Rolled Stainless Steel Plate Sheet and Strip
GB/T 4171 Atmospheric Corrosion Resisting Structural Steel
GB/T 6394 Metal-methods for Estimating the Average Grain Size
GB/T 17505 Steel and Steel Products - General Technical Delivery Requirements (GB/T 17505-1998, eqv ISO 404.1992)
3 Order
For the purpose of this Standard, the order contract or order form shall include the following information.
a) Serial number of this Standard;
b) Product dimension;
c) Raw material designation and corresponding product yield strength grade; d) Delivery weight (theoretical weight or actual weight) and delivery length; e) Other requirements.
4 Classification and Code
4.1 According to section shape.
Cold-formed circular hollow section, circular section for short, code. Y Cold-formed square hollow section, square section for short, code. F
Cold-formed rectangular hollow section, rectangular section for short, code. J Cold-formed irregular hollow section, irregular section for short, code. YI Cold-formed opening section steel, or opening section steel for short, having the following codes depending on the section shape. JD (equal-leg angle steel), JB (unequal-leg angle steel), CD (equal-leg channel steel), CB (unequal-leg channel steel), CN (interior crimping channel steel), CW (exterior crimping channel steel), Z (z-steel), ZJ (crimping z-steel).
4.2 According to yield strength grade. 235, 345, 390.
8 Acceptance Rules
8.1 Inspection and acceptance
Inspection and acceptance of cold forming steel sections are carried out by quality inspection department of the Seller. The Buyer is entitled to re-inspect them. 8.2 Batching rules
Cold forming steel sections shall be accepted in batches; each batch consists of the products with the same designation, made of the same raw materials and with the same specification and same dimension. Each of products whose outer perimeter is 400mm or less shall be 50t or less; while each batch whose outer perimeter is over 400mm shall be 100t or less.
8.3 Re-inspection and judgment
Re-inspection and judgment rules of cold forming steel sections shall meet the requirements of GB/T 17505.
9 Packaging, Marking and Quality Certificate
9.1 Packaging
9.1.1 Bundling
9.1.1.1 Cold forming steel sections are delivered in a bundled state; the packed cold forming steel sections shall be placed regularly at one end. Each bundle shall contain the same batch of cold forming steel sections. Maximum weight per bundle shall meet those specified in Table 3.
Table 3 Bundle Weight
Theoretical weight /(kg/m) Maximum weight per bundle /t
< 1 1
1???< 10 3
10???< 20 5
???20 10
9.1.1.2 Cold forming steel sections shall be secured by steel strips or bundled for packing. They shall be bundled at three points if its length is 7m or less, or four points if its length is 7m ~ 10m, or five points if its length is over 10m. The bundle positions at the ends shall be spaced by 1m at most.
9.1.2 Encasement
9.1.2.1 Cold forming steel sections shall be encased if higher requirements are proposed for the surface quality; the packaging box shall be solid and made of wood or steel.
9.1.2.2 Each case shall contain the same batch number of cold forming steel sections. If the products of different batch number will be put into the same case, each batch number shall be bundled separately and then placed into the case. 9.1.2.3 Weight of cold forming steel sections per case shall not be greater than 4 t. 9.1.2.4 Packaging box shall be fastened by steel strips for packing or other methods at the external part.
9.1.3 Others
Cold forming steel sections may be delivered in bulk if their theoretical weight is more than 20kg/m.
9.2 Marking
9.2.1 Marking of the package
Each bundled or encased cold forming steel sections shall be embedded with more than two labels or affixed with tags or provided with methods which enable the labels to be kept. The label or tag shall be indicated with name and trademark of the Seller, specification, designation of raw material, production batch number, product standard number, weight, specified length, manufacture date and mark of quality inspection department of the Seller.
9.2.2 Marking of bulk package
Each cold forming steel sections in bulk shall be affixed with tags or spray-printed with marks on the surface close to the end. The mark shall be clear, visible and difficult to fall off, and shall be indicated with name and trademark of the Seller, specification, designation of raw material, production batch number, product standard number, weight, specified length, manufacture date and mark of quality inspection department of the Seller.
9.3 Quality certificate
Quality certificate shall meet the relevant requirements of GB/T 2101.

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