20# carbon steel pipe 1.Standard:ASTM,AISI,EN,DIN,BS 2.O.D: ... About the Products: Descriptioncarbon steel pipe,seamless steel pipe,steel pipe StandardGB5310-95,GB8087-1999,GB8162,GB8163-1999,GB3087,GB6479-86,ASTM A106,A53,A210,DIN17175Material10#,20#,45 ... latest domestic standards of A312,A240,A335 P22, A335P11, API Specs 5CT, API 5L, ASTM A106-B, ST52, BS 1387, BS1139, EN10217 and other ...