... : Q195, Q215, Q235, Q345B, X42, Gr. B Square Pipe:hollow section, good quallity and attractive price 1.Item: hollow ... , ASTM, BS, JIS, 3.Material: Q195, Q215, Q235, Q345B, X42, Gr. B4.Specification: OD: 15*15mm-400*400mm, WT: 0.6mm ... section2. Process methodCold drown, high frequency welded3. MaterialQ195---Q2354. Size a. side length15mm--600mm b. W.T.0.3mm--13.5mm5 ...