ERW Round Black Tube and ASTM A500 MS Hollow SectionSize20mm-273mmWall thickness (W.T.)1.2mm-10mmLength1m-12m ,by customer’s requirementsStandardsASTM A53,BS1387-1985,GB/T3091-2001,GB/T13793-92, GB/T6728-2002MaterialsQ195-Q235,Q235,Q345Product CategoryMetallurgy, Mineral & EnergyTechniqueWeldedPacking1.Big OD: in bulk vessel ..