... Diameter of Steel Pipe: 10"-24"2) Thickness of Steel Pipe: 6mm-20mm3) Steel grade of Steel Pipe: grade B , 20# , Q235 , ST 52 , ST374) Standards of Steel Pipe ... precision cold rolled steel tubes are available here 3Applicationuse for oil well, boilers, precision machines, petro-chemical, ship, structure pipe, automobile, shock ...