20# carbon steel pipe 1.Standard:ASTM,AISI,EN,DIN,BS 2.O.D ... A53,A210,DIN17175Material10#,20#,45#,16Mn,14MnNb,20G,ST35.8,A106B,12CrMo,15CrMo,20CrMo,42CrMo,12Cr1Mov,10CrMo910,35CrMo4O.D3mm~500mmW.T1mm ... latest domestic standards of A312,A240,A335 P22, A335P11, API Specs 5CT, API 5L, ASTM A106-B, ST52, BS 1387, BS1139, EN10217 ... any other questions,pls contact me without hesitate. 20# carbon steel pipe