... factory manufacture Casing pipe, Tubing pipe, OCTG, Oil pipe for oilfield: According to API SPEC 5CT.3. Steel grade: J55, K55, L80 ... , N80, C95, P1104. O. D. Range Tubing pipe: From 2-3/8 ... : R1, R2, R38. If you interested in our Casing pipe, Tubing pipe, Coupling, OCTG, Oil pipe, feel free to contact with ...