We can provide you with Erw Pipe, Structurual Pipe, Api Pipe, hollow section tube. High frequency steel pipe: GB/T3091-2001, GB/T13793-92, GB/9711, 1-1997, ASTM A53-04, DIN2458/1626 33.4X(2.5-4.5)mm 40X(2.5-4.5)mm 42.5X(2.5-4.5)mm 48X(2.5-4.5)mm 51X(2.5-4.5)mm 60X(2.5-4.5)mm 62.5X(2.5-4.5)mm 73X(2.5-4.5)mm 76X(2.5-4.5)mm 80X(2.5-4.5)mm 82.5X(2.5-4.5)mm 89X(2.5-4.5)mm 94X(2.5-4.5)mm 95X(2.5-4.5)mm 102X(3-8)mm 104X(3-8)mm 108X(3-8)mm 114X(3-9)mm 121X(3-9)mm 127X(3-9)mm 133X(3-9)mm 140X(3-10)mm 152X(3-10)mm 159X(3-10)mm 165X(3.5-10)mm 168.3X(3.5-10)mm 180X(3.5-10)mm 194X(3.5-10)mm 203X(3.5-10)mm 219X(4-10)mm 244.5X(5-16)mm 273.1X(5-16)mm 299X(5-16)mm 323.9X(5-16)mm 351X(5-16)mm 355.6X(5-16)mm 377X(5-16)mm 406.4X(5-16)mm