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Hebei haihao high pressure flange & pipe fitting group was established in 1982, located in Mengcun County the hometown of pipe fittings in China.


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API 5CT Casing and Tubing


The main steel grade of API 5CT: API 5CT J55, API 5CT K55, API 5CT N80, API 5CT L80, API 5CT P110. This International Standard 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 by this International Standard, the sizes, masses, wall thicknesses, grades and applicable end finishes are defined. This International Standard may also be applied to tubulars with connections not covered by ISO/API standards.

API 5CT Casing  steel pipes

API 5CT Casing steel pipes

The main steel grade of API 5CT: API 5CT J55,API 5CT K55,API 5CT N80,API 5CT L80,API 5CT P110. Packing: Bare/bundles/crates/crate protection at the both sides of tubes or as per customers’ requirements .

Chemical Composition

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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