... ~11.8m 4) Material: hot rolled carbon square steel pipe 1.size:10*10mm-600*600mm2.thickness ... Quality: ISO900:2000, API5L, API5CL Product square steel pipesStandardGB/T3091-2001,BS1387,ASTM A53, ASTM A106 ... , EN10219MaterialQ195,Q215,Q235,Q345, 20#, A53 A/B, A106 B/C, St37, ... , in loose or seaworthy packing , wrapped with steel strip or at sellers optionUsageConstruction, bridge, highway, ...