... 508* 1-55mm 3.competitive prices 4.fast delive hydraulic cylinder steel pipe OD 3" 1:ASTM A106/A53-B API5L- ... B ASTM A53-B API 5L-BAPI 5L, X42, X52, and 5CT ,J55 ,K55SAE1020 ,SAE1045 JIS G4051, S20C ,S45C, JIS ... Application field:Transportation of oil,gas or fluid,Construction,Electricity,Machine building industy,Chemical industy,Petroleum,Traffic. Standardgradechemical composition(%)CSiMnPSCuNiMoCrDIN ...