1. Products: Tubing and Casing 2. Standards: API 5CT, API SPEC 5B, ISO 11960 3. ... Grade: J55, K55, N80, P110, L80 etc 1. Products: Tubing and Casing 2. Standards: API 5CT, API SPEC 5B, ISO 119603. Steel ... . Application Range: Tubing is used to extracting petroleum and natural gas from a well; casing serves as walls of a well. 13 ...