... Casing Pipe 1.Grade:J55,K55,N80,L80,P110 2.Thread:STC,LC,BC 3.Standard:API 5CT, ISO9001 ... :2008 4.Place of Origin: China API Casing Pipe----------------------------------------------------------------------------------------------------------------------------Feature API 5CT Oil Casing PipeMaterials: J55, K55, N80 1, N80 Q ... in the process of oil casing, tubing, casing coupling, pup joint, ...