... Steel Pipe Outer diameter21.3-762mmWall thickness2.5-60mmStandardASME SA213,ASME SA210,ASTM A335,ASTM A333,DIN17175,GB/T9163,GB/T8162 ... hollow cross-section, for a large number of pipes conveying fluid, such as the transportation of oil, natural gas, coal gas, water ... an economic cross-section steel, widely used in the manufacture of structural parts and mechanical parts, such as drill pipe, automotive ...