Aug 26, 2025 Leave a message

Mechanical Properties of API 5CT Tubing

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.

 

API 5CT Tubing

 

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

-

-

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