Square Pipe: Material: Q195, Q215, Q235, Q345B, X42, Gr. B Square Pipe:hollow section, good quallity and attractive price 1.Item: hollow section2.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. MaterialQ195---Q2354. ...