high precious pipe , smooth surface NOSteel pipeStandardSteel gradeSpecificationOD×WAL×LENGTH (mm)1Oil pipeAPI5CT-2005J55,N80,L80,C90,P11060.3~114.3×4.24~16×6100~128002Oil casing PipeAPI5CT-2005J55,N80,L80-1,C90,T95,P110,Q125,9Cr,13Cr114.3~177.8×5.21~22.22×4877~146303Line pipeAPI5L-2007B,X42,X46,X52,X60,X65,X70,X8060.3~168.3×3.6~22.2×6000~120004Transmission fluid tubeGB/T8163-199910,20,Q295, ...