The inner surface of API 5CT K55 casing pipe shall not be folded, textured, separated, cracked, rolled and folded.These defects should be completely removed at a depth not exceeding 12.5% of the nominal wall thickness of API 5CT K55 casing pipe. API 5CT K55 casing pipe sleeves are defined as SY/T6194-96. API 5CT K55 casing pipe and its coupling adopt uniform steel grade. Sulfur< 0.045%, phosphorus< 0.045%.
API 5CT K55 casing pipe detection standard, according to the delineation of GB222-84 chemical analysis samples; Chemical analysis was conducted according to the relevant local demarcation in GB223. ARISPEC5CT1988 1st Edition.Chemical analysis of API 5CT K55 casing pipe was made according to ASTME59 new version and ASTME350 new version.
The inlet size of API 5CT K55 casing pipe is mostly referred to API 5a, 5AX, 5AC.The steel grades are H-40, J-55, N-80, P-110, C-75, C-95, etc. The important specifications are 139.77.72R-2, 177.89.19R-2, 244.58. 944.510. 03R-2, 244.511.05R-2, etc.