oil well tubing 1.standard:API 5CT 2.Certification:SGS 3.material:N80/L80/K55/J55/ ... diameter1"-32"ApplicationOil,gas and other liquid transportation or constructionStandardGB JIS ASTM AISI DINMaterialL80 13cr,J55, K55, N80, L80, C90, t95 ... ,LTC,STC. Tubing (NUE,EUE)surface treatment FBE,PE,VARNISHCertificationISO , API, Mill Test CertificateMain marketUSA, Canada, Turkey,Europe,Asia.and so ...