... JIS G3455-2005, GB/T ...Grade: 10#-45#, 16Mn, ST35-ST52, Q195-Q345Grade: 20#, 45#, 16Mn, St52, St42 ... A53-B API 5L-BAPI 5L, X42, X52, and 5CT ,J55 ,K55SAE1020 ,SAE1045 JIS G4051, S20C , ... : paint,bundles or for the clients’ needs(8) Application field:Transportation of oil,gas or fluid, ... industy,Petroleum,Traffic.Standardgradechemical composition(%)CSiMnPSCuNiMoCrDIN 17175ST37ST35.8 0.07~0.140.17~0.370. ...