supply structural square steel pipe

1) Dimentions: 30*30mm-800*800mm, Thickness: 3-40mm Length: <13m 2) Material: Q235, Q345, 20#, ST37, ST44, ST52, ASTM A53, ASTM A106,STKR490 3) Standards: JIS G 3466, DIN EN 10210, DIN EN10219, ASTM A500, GB/T 3094-2000, GB/T 6728-2002 4) Use: construction structure, machinery making, container, hall structure, sun seeker, offshore oil field, sea trestle, motorcar cassis, airport structure, shipbuilding, automobile axle pipe and so on. 5) Packing: square shape bundles wrapped with strong steel strip or according to customers' requests 6) Surface: oiled or black painted to prevent rust 7) Plain or beveled ends 8) OEM available 9）Certificates: CE,CCS