Detailed Product Description 1.Item: Square tube2.Standard: GB, ASTM, BS, JIS, 3.Material: Q195, Q215, Q235, Q345B, X42, Gr. B4.Specification: OD: 15*15mm-400*400mm, WT: 0.6mm-12mm 1. Commodity specificationsSquare hollow section2. Process methodCold drown, high frequency welded3. Material Q195---Q2354. Size a. side length15mm600mm b. W.T.0.313mm5. lengthMax 13 meters6. StandardGB/T6728-2002 or ...