... 5CT 5.Place of Origin: Liaoning, China SPECIFICATIONSWell Casing and Tubing Pipe API 5CT Oil Casing PipeMaterials: J55, K55, N80 1, N80 Q, L80 ... and accord with the requirements of API 5CT. API 5CT Tubing PipeMaterials: J55, K55, N80 1, N80 Q, L80, ,C90,C95 ... your request and accord with the requirements of API 5CT. Tubing and Casing Pipe