... A106,ASTM A192,ASTM A210 OD:6-610mm(1/4"-24") Seamless Steel Pipe 1.Standard:GB/T8162,GB/T8163-1999 ... -50mm (SCH 5S-SCH160)4.OD:6-610mm(1/4"-24")5.End: BE,PE, BW,SW,NPT,RF,BW X ... : custom seaworthy package(bundling)or customized7. Surface Finish: can be oil,painting or hot Galvanized . carbon seamless steel pipe