Grade | Type | Total under load Elongation % | Yield strength megapascal | Tensile strength megapascal | Hardness a, C Maximum | Specified OD mm | Allowable hardness Variation |
Min | Max | Min | HRC | HBW | HRC |
K55 | – | 0.5 | 379 | 552 | 655 | – | – | – | – |
Case:
Our K55 oil casing is designed for medium to deep wells from 2000-3500m, with LC long round button threads for safe isolation from high pressure layers and economical completion solutions in ≤100ppm H₂S micro-sulfur environments. It has been successfully applied in China’s Changqing Surig gas field and Sichuan Basin shale gas project, and participated in international energy projects such as Delta high temperature sulfur gas wells in Egypt’s Nile River and Venezuela’s Orinoco ultra-thick oil thermal recovery, guaranteeing the integrity of the wellbore with cost-effective solutions.