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Oil casing API 5CT J55 and API 5CT K55

API 5CT Oil Casing for Sale

API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells.

  • Heat treatment

PSL1 requirements: J55 and K55 same way ;
PSL2 requirements: J55, K55 product should be normalized or normalized and tempered overall, if thick, should be normalized or normalized and tempered after thickened.

  • Tensile test

J55: yield strength of 379MPa ~ 552MPa; tensile ≥517MPa; minimum elongation of J55 is 19%.
K55: yield strength of 379MPa ~ 552MPa; tensile ≥655MPa; minimum elongation of K55 is 15%.

  • Impact test

J55 and K55 impact test must be done, the minimum size of the sample lateral impact energy 20J, the smallest full-size sample longitudinal impact energy 27J.

  • Wall thickness detection

PSL1: J55 and K55 for measuring the wall thickness of no coverage requirements;
PSL2: J55 and K55 for wall thickness measurement and recording deal with the entire length of the best coverage of the surface area of ​​automatic detection system should reach 25%.

  • NDT

PSL1: J55 and K55 on the tube did not do destructive testing mandatory requirements;
PSL2: J55 and K55 for all pipe shall be one or more of the criteria specified in 10.15.5 tested to find the inner surface of the outer surface of the pipe and can receive the level of L4 longitudinal imperfections.

  • The main steel grade of API 5CT:

API 5CT J55, API 5CT K55, API 5CT N80, API 5CT L80, API 5CT P110.

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
 
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