... pipe for liquid transport :Applicable to transport liquid, gas, oil etcMechanicalseamless steel tubing: Applicable to the general structure, mechanical structure ... Rst37-2, RSt44-2, St52Size: OD 16mm - OD 426mmOCTG PIPE, OIL PIPELINE:Material:J55,K55,N80,P110,L80/Gr.B X42,X46 ... coating:varnish painted on pipe(black painting),anti-corrosion oil,galvanized,or painting as customer's request.Size:(outer ...