... 2007, JIS G3455-2005, GB/T ...Grade: 10#-45#, 16Mn, ST35-ST52, Q195-Q345Grade: 20#, 45#, 16Mn, St52, St42, Q345, ... Not: Non-secondaryApplication: Fluid PipeTechnique: Hot RolledCertification: APISurface Treatment: paintSpecial Pipe: API PipeAlloy Or Not: Non-alloyASTM: 20#ISO: blackPackaging & ... ,SAE1045 JIS G4051, S20C ,S45C, JIS G3454, JIS 3454 ,STPG42 DIN 17175 ST 45-8, ST 52 (5) Tolerate: OD :+1% / ...