... /X70API 5CT K55/J55/N80/L80/P110ASTM A106 GR.B /C ASTM A53 GR.BA333 GR.1-GR6 A335 P11/P22 ... A213 T5/T11/T22/T12T/T9/T91ASTM A519 1020/4130A210-A/C A192 A179-CApplicationOil drilling,boiler,precision machines ,petroleum,Chemical,structure ... bundles,Painting ,Beveled edges,plastic caps ends, or as buyer’s request.CertificationISO 9001:2000 API 5L PSL1 API 5L PSL2 ...