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- API 5CT N80 casing and tubing pipe
- API 5CT K55 casing and tubing pipe
- API 5CT J55 casing and tubing pipe
- EN10028-2 16Mo3 Boiler and Pressure Vessel steel Plate Notch impact energy
- EN10028-2 P265GH Pressure vessels steel equivalents
- EN 10210 S355J2H low alloy carbon structural steel
- EN 10210 S355J0H steel hollow materials
- GB/T 18248 34CrMo4
- GB/T 18248 35CrMo alloy steel
- 30CrMo steel Heat treatment, 30CrMo steel tube/pipe
mechanical properties of API 5CT heat treatment
K55 has better mechanical and thermal fatigue resistance and crack resistance than K55. For a thermal production well, the heavy wall K55 casing is appropriate instead of J55 casing. The former has a better thermal fatigue resistance property than the latter.
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 |
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%.