... -1999,GB3087,GB6479-86,ASTM A106,A53,A210,DIN17175Material10#,20#,45#,16Mn,14MnNb,20G,ST35.8,A106B,12CrMo,15CrMo, ... requiredCertificateISO,CE,APITechniqueHot rolled,cold rolledSurfacePolished,black,bright ApplicationPetroleum and Oil,Chemical Industry, Energy sources, Metallurgy, ContructionPackageIn Bulk Woven bags ... have any other questions,pls contact me without hesitate. 20# carbon steel pipe