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You are here: Home > FAQmechanical properties of API 5CT heat treatment

mechanical properties of API 5CT heat treatment

Posted:2018-07-18 16:56:13

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%.

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