Galvanized steel pipe O.D:12mm~720mm W.T:0.1mm~30mm ... third party inspection.The detailed specifications of galvanized steel pipes Length6m~12mMaterial10#,20#,45#16Mn,A53(A,B),STP A22,Q235,Q345,Q195,Q215 ... GB/T8162-1999,GB/T3091-2001,GB/T8162,GB/T8163,ASTM A53-2007,ASTMA335M-2006Wall thickness0.1mm~30mm,or according to clients ... you are interested in our product,please contact me. Galvanized steel pipes