API 5CT seamless steel tubing

Peotroleum and natureal gas industies - Steel pipes for use as casing or tubing for wells.


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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