API 5CT is a standard on the oil casing by American Petroleum Institute, mainly for the oil pipe, tubing and casing.
Standard: API SPEC 5CT
Size (mm):
Outer Dimensions: 6.0mm ~ 219.0mm
Wall Thickness: 1.0mm ~ 30 mm
Length: max 12000mm
Application: gas, water and oil transportation in both oil and natural gas.
Steel grade: J55, K55, N80, L80, P110.
Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers' requirements .
Painting: as requested.
As different geological conditions, underground complex stress state, pulling, pressing, bending, torsional stress acting on the combined effect of the tube, which the casing itself, the quality of the higher requirements. Once the casing itself is damaged for some reason, could lead to the whole production wells, or even scrapped.
Chemical Composition(%) of API 5CT
| Grade | C≤ | Si≤ | Mn≤ | P≤ | S≤ | Cr≤ | Ni≤ | Cu≤ | Mo≤ | V≤ | Als≤ |
| API 5CT J55 | 0.34-0.39 | 0.20-0.35 | 1.25-1.50 | 0.020 | 0.015 | 0.15 | 0.20 | 0.20 | / | / | 0.020 |
| API 5CT K55 | 0.34-0.39 | 0.20-0.35 | 1.25-1.50 | 0.020 | 0.015 | 0.15 | 0.20 | 0.20 | / | / | 0.020 |
| API 5CT N80 | 0.34-0.38 | 0.20-0.35 | 1.45-1.70 | 0.020 | 0.015 | 0.15 | / | / | / | 0.11-0.16 | 0.020 |
| API 5CT L80 | 0.15-0.22 | 1.00 | 0.25-1.00 | 0.020 | 0.010 | 12.0-14.0 | 0.20 | 0.20 | / | / | 0.020 |
| API 5CT J P110 | 0.26-035 | 0.17-0.37 | 0.40-0.70 | 0.020 | 0.010 | 0.80-1.10 | 0.20 | 0.20 | 0.15-0.25 | 0.08 | 0.020 |
Mechanical Properties of API 5CT
| Steel Grade | Yield Strength (Mpa) | Tensile Strength (Mpa) |
| API 5CT J55 | 379-552 | ≥517 |
| API 5CT K55 | ≥655 | ≥517 |
| API 5CT N80 | 552-758 | ≥689 |
| API 5CT L80 | 552-655 | ≥655 |
| API 5CT P110 | 758-965 | ≥862 |
API 5CT oil casing used in oil well drilling, which is mainly used for drilling and completion of the right wall of the support, to ensure that the conduct and completion of the drilling process after the normal operation of the wells.
Casing is to maintain the wells run lifeline.
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