API Spec 5CT Casing and Tubing

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API Spec 5CT Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

5CT Casing and Tubing

api 5ct, API 5CT J55, API 5CT K55, API 5CT L80, API 5CT N80, API 5CT P110, API SPEC 5CT, casing, steel pipes, Tubing


The main steel grade of API 5CT:

  • API 5CT J55
  • API 5CT K55
  • API 5CT N80
  • API 5CT L80
  • API 5CT P110
Casing pipe end thread type
The International Standard specifies the technical delivery conditions for steel pipes (casing, tubing, plain end casing liners and pup-joints) and accessories. It is applicable to the following connections in accordance with ISO 10422 or API Spec 5B:
- short round thread casing (STC);
- long round thread casing (LC);
- buttress thread casing (BC);
- extreme-line casing (XC);
- non-upset tubing (NU);
- external upset tubing (EU);
- integral joint tubing (IJ).
For such connections, this International Standard specifies the technical delivery conditions for couplings and thread protection.
For pipes covered, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined.
It may also be applied to tubulars with connections not covered by ISO/API standards.

Chemical Compositions(%) of API 5CT

GradeC≤Si≤Mn≤P≤S≤Cr≤Ni≤Cu≤Mo≤V≤Als≤
API 5CT J550.34-0.390.20-0.351.25-1.500.0200.0150.150.200.20//0.020
API 5CT  K550.34-0.390.20-0.351.25-1.500.0200.0150.150.200.20//0.020
API 5CT N800.34-0.380.20-0.351.45-1.700.0200.0150.15///0.11-0.160.020
API 5CT  L800.15-0.221.000.25-1.000.0200.01012.0-14.00.200.20//0.020
API 5CT J P1100.26-0350.17-0.370.40-0.700.0200.0100.80-1.100.200.200.15-0.250.080.020

Mechanical Properties of API 5CT

Steel GradeYield Strength (Mpa)Tensile Strength (Mpa)
API 5CT J55379-552≥517
API 5CT K55≥655≥517
API 5CT N80552-758≥689
API 5CT L80552-655≥655
API 5CT P110758-965≥862
For pipes covered by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined.

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