OD of Carbon Steel Seamless Pipe: 21.3-219mm W/T of Carbon Steel Seamless Pipe: 2.77-17.48mm Standard of Carbon Steel Seamless Pipe: GB/T8162-1999/ASTMA106/ASTMA53 Material of Carbon Steel Seamless Pipe:10#/20#/45# carbon steel Our company professionally provide different kinds of steel pipes.Such as seamless steel pipe, seamless steel tube, welded steel pipe, carbon steel pipe, anti-corrosion steel pipe and galvanized steel pipe.If you are interested in the items, please feel free to tell us, your inquiry will be highly treated