Steel Tube 1.Grade:SGCC DX51D DX53D DX54D, etc 2.Wall Thickness: ... 3.OD:10.0-165mm 4.ND:6-150mm StandardAISI, ASTM, BS, DIN, GB, JIS, etcGradeSGCC, DX51D, DX53D, DX54D, etcWall Thickness2 ... Rolled Steel Plate, Cold Rolled Steel Plate, Mild Steel Plate, Structure Steel, difference kind of pipes, Galvanized Steel Pipe, Seamless Steel Pipe, Square/Rectangular Steel Tube, Light/Heavy Steel Rail ...