DN500 large diameter steel pipe: 1. Factory Direct sell 2. OD: 219-1219mm 3. GB,ASTM,DIN,JIS 4. Carbon Steel Pipe Steel Tube 500 mm in Diameter Large Diameter Steel Pipe DN500 Steel Pipe1. Factory sell 2. OD: 219-1219mm DN500 508mm3. GB,ASTM,DIN,JIS,BS 4. Carbon steel pipeSpecifications: StandardASTM, BS, JIS, DINSteel GradeGB 10#-45#/Q195-Q345,ASTM A53-A369,DIN ST35-ST52O.D.10"--48"W.T. SCH10-- ...