Square steel pipe OD: 30*30mm-800*800mm WT: 3-40mm Square steel ... #, ST37, ST44, ST52, ASTM A53, ASTM A106,STKR4903) Standards: JIS G 3466, DIN EN 10210, DIN EN10219, ASTM A500, GB/T ... field, sea trestle, motorcar cassis, airport structure, shipbuilding, automobile axle pipe and so on.5) Packing: square shape bundles wrapped with ... beveled ends8) OEM available 9)Certificates: CE,CCS square steel pipe