GB/T 6728 standard specifies the order content, classification, code, section, size and allowable deviation, length and allowable deviation, shape, weight and allowable deviation, technical requirements and marking examples of cold-formed hollow section steel for structural use.
This standard applies to cold rolled or hot rolled steel plate and steel strip in the continuous cold unit production of round and square cold hollow type (hereinafter referred to as section steel) applies to continuous hot type. Applicable to steel produced by isotype and with
Zinc steel plate and steel strip cold-formed and welded molded steel sections.
The steel sections specified in this standard are mainly welded by high-frequency resistance welding, and arc welding or other welding methods can also be used.
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Order content
Contracts or orders for orders in accordance with this standard shall include the following.
Standard No.;.
Product name; 6
Grade number; 6 Product name; 7 Grade number
Delivery weight
Size and shape.
Special Requirements.
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Classification, designation
Steel sections are categorized into square, rectangular and round according to their shape. Their designations are
1) Square section pipe, can also be referred to as square pipe, code: F
2) Rectangular steel section, can also be referred to as moment pipe, code: J
3) Round section steel, can also be referred to as round tube, code: Y