Steel casing pipe is a type of pipe used in the oil and gas industry, primarily for well construction. It is designed to provide structural integrity and support to the wellbore, preventing collapse and protecting the surrounding environment from contamination.
The API 5CT grades available encompass J55/K55, N80 Type 1, N80Q, L80, C90, T95, P110, and Q125, along with additional specifications for 13 Cr.
Steel Casing pipe Feature
Casing pipe section shape is a round, big diameter pipe put into the oil well, fixed by the cement, to protect other equipment which is mostly made of iron and steel. Oil wells shall be designed to bear the different strengths of external power, such as crush, explosion, stress, and chemical corruption. During the well drilling process, put casing into the well bore, it will stabilize the well bore perfectly.
Key Features of Steel Casing Pipe:
Material: Typically made from high-strength steel, casing pipes are engineered to withstand high pressures and harsh conditions encountered during drilling operations.
Standards: Steel casing pipes often conform to industry standards such as API 5CT, which specifies the requirements for casing and tubing used in the oil and gas industry.

|
Grade |
Type |
Total elongation under load (%) |
Yield strength (min) |
Yield strength (max) |
Tensile strength min Mpa |
Hardness Max (HRC) |
Hardness Max (HBW) |
|
J55 |
- |
0.5 |
379 |
552 |
517 |
- |
- |
|
K55 |
- |
0.5 |
379 |
552 |
655 |
- |
- |
|
N80 |
1 |
0.5 |
552 |
758 |
689 |
- |
- |
|
N80 |
Q |
0.5 |
552 |
758 |
689 |
- |
- |
|
L80 |
1 |
0.5 |
552 |
655 |
655 |
23 |
241 |
|
L80 |
9Cr |
0.5 |
552 |
655 |
655 |
23 |
241 |
|
L80 |
13Cr |
0.5 |
552 |
655 |
655 |
23 |
241 |
|
C90 |
- |
0.5 |
621 |
724 |
689 |
25.4 |
255 |
|
C95 |
- |
0.5 |
655 |
758 |
724 |
- |
- |
|
T95 |
- |
0.5 |
655 |
758 |
724 |
25.4 |
255 |
|
P110 |
- |
0.6 |
758 |
965 |
862 |
- |
- |
|
Q125 |
All |
0.65 |
862 |
1034 |
931 |
- |
- |





