... , A53-A369, API J55-API P110, ST35-ST52, Q195-Q345Grade10#, 20#, 45#, 15Mo3, 16Mn, API J55, API K55, St37, St52, St37 ... .11 - 100 mmSection ShapeRoundOuter Diameter21.3~1219.2mmPlace of OriginJiangsu, China (Mainland)Secondary Or NotNon-secondaryApplicationFluit PipeTechniqueHot RolledCertificationAPISurface TreatmentBlack paint,varnishi coating ...