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Api 5ct standards

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What is API 5CT?

API 5CT is standard technical specifications for steel casing and tubing pipes used for oil wells in petroleum and natural gas industries.

This standard specifies the technical delivery conditions for steel pipes (casing, tubing, and pup joints), coupling stock, coupling material, and accessory material, and establishes requirements for three product specification levels (PSL-1, PSL-2, and PSL-3). The requirements for PSL-1 are the basis of this standard. The requirements that define different levels of standard technical requirements for PSL-2 and PSL-3, for all grades (except H-40, L 80 9Cr, and C110) are provided.


Connections

This standard is applicable to the following connections in accordance with API 5B:

- short round thread casing (SC)

- long round thread casing (LC)

- buttress thread casing (BC)

- non-upset tubing (NU)

- external upset tubing (EU)

- integral tubing (IJ)

For such connections, this standard specifies the technical delivery conditions for couplings and thread protection. Supplementary requirements that can optionally be agreed upon for enhanced leak resistance connections (LC) are provided.

This standard can also be applied to tubulars with connections not covered by API standards.

This standard is not applicable to threading requirements.

Note:Dimensional requirements on threads and thread gauges, stipulations on gauging practice, gauge specifications, as well as instruments and methods for inspection of threads, are given in API 5B.


Grades:

The products to which this standard is applicable include the following grades: H40, J55, K55, N80 (all types), L80 (all types), C90, R95, T95, P110, C110, and Q125.

Groups of Grade:

- Group 1: All casing and tubing in Grades with H, J, K, N and R
- Group 2: All casing and tubing in Grades with C, L, M and T
- Group 3: All casing and tubing in Grade P
- Group 4: All casing in Grade Q


Mechanical Properties of API 5CT

steel grade

 

type

 

total elongation under load (%)

 

yield strength (Mpa)

 

tensile strength (Mpa)

min

hardness 

max

min

max

HRC

HBW


H40

-

0.5

276

552

414

-

-

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

-

-

M65

-

0.5

448

586

586

22

235

L80

1

0.5

552

655

655

23

241

L80

9 Cr

0.5

552

655

655

23

241

L80

13 Cr

0.5

552

655

655

23

241

C90

1

0.5

621

724

689

25.4

255

P110

-

0.6

758

965

862

-

-


Chemical Composition

 

steel grade

 

type

C

Mn

Mo

Cr

Ni

Max

Cu

Max

P

Max

S

Max

Si

Max

Min

Max

Min

Max

Min

Max


Max





H40

-

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

J55

-

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

K55

-

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

N80

1

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

N80

Q

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

M65

-

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

L80

1

-

0.43

-

1.90

-

-

-

-

0.25

0.35

0.030

0.030

0.45

L80

9 Cr

-

0.15

0.30

0.60

0.90

1.10

8.00

10.0

0.50

0.25

0.020

0.010

1.00

L80

13 Cr

0.15

0.22

0.25

1.00

-

-

12.0

14.0

0.50

0.25

0.020

0.010

1.00

C90

1

-

0.35

-

1.20

0.25

0.85

-

1.50

0.99

-

0.020

0.010

-

P110

-

-

-

-

-

-

-

-

-

-

-

0.030

0.030

-

Q125

1

-

0.35

-

1.35

-

0.85

-

1.50

0.99

-

0.020

0.010

-

Note:If the wall thickness is less than 17.78mm, the molybdenum content of the C90-1 steel grade has no lower limit.


Equivalent API Spec 5CT standard

· API Spec 5CT – Specification 5CT/ISO 11960, Specification for Casing and Tubing, Eighth Edition, Petroleum and natural gas industries-Steel pipes for use as casing or tubing for wells

· This product references:

· API Spec 5B – Specification for Threading, Gauging, and Thread Inspection of Casing, Tubing, and Line Pipe Threads (US Customary Units) (Includes March 2004 Addendum)

· ISO 10422:1993 – Petroleum and natural gas-industries; threading, gauging, and thread inspection of casing, tubing and line pipe threads; specification

· This product replaces:

· API 5CT – Specification for Casing and Tubing (U.S. Customary Units)

· ISO 11960 was prepared by Technical Committee ISO/TC 67, Materials, equipment and offshore structures for petroleum, petrochemical and natural gas industries, Subcommittee SC 5, Casing, tubing and drill pipe.

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