... Alloy steel Use:Well Drilling Wellhead Equipment & Christmas Tree (API 6A Series) Working pressure: 2000PSI~20000PSIWorking ... ~121°C(Class LU)Material class: AA,BB,CC,DD,EE,FF,HHSpecification level: PSL 1-4Performance ... of casing head, tubing head and Christmas tree.Apply to all kinds of casing, tubing ... ~121°C(Class LU)Material class: AA,BB,CC,DD,EE,FFSpecification level: PSL 1-4Performance level: ...