Square Tube Dimension 20mm*20mm-1000*1000mm Rectangular Tube Dimension 20mm*30mm-600mm*1000mm Thickness 2mm-35mm Length 6m-12m or as per customerâ??s requirements Standards DIN,EN10210,EN10219,GB/T3094-2000,ASTM A500,JIS G 3466,GB/T6728-2002 Steel Grades Q195, Q235, Q345(16Mn), STKR400/490, A500, ST37/44/52, S235, S275, S355, etc. Surface Treatment anti-rust oil, black painting, galvanizing TPI SGS, BV, MOODY, CCIC can be arranged before shipment. Packing in bundles with steel strips or in bulk as per customer request Applications Construction framework,  trestle, motorcar cassis,flight terminal framework, shipbuilding, automobile axle pipe, MRT and so on