API 5CT

API 5CT

API Spec 5CT, Casing and Tubing Specification, Eighth Edition, Petroleum and Natural Gas Industries- Steel pipes for use as casing or tubing for wells. This Standard includes standards for three Product Specification Levels and specifies the technical delivery conditions for steel pipes (Casing, Tubing, and Pup Joints), coupling stock, Coupling material, and accessory material (PSL-1, PSL-2, PSL-3).

The steel material used to make the pipe billet supplied must have grain refining treated, according to the API 5CT standard. This steel must contain one or more grain refining elements, such as aluminum, niobium, vanadium, or titanium, in order for the austenite grains of the steel to be refined.

OCTG PRODUCT FEATURES

Steel Grade of API 5CT Standard

  • 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

Dimensions and Sizes of API 5CT Casing and Tubing

- Specification & Size of API 5CT Tubing

DN

O. D.

Weight

W. T.

End Processing

Non-upset coupling-thread

Upset coupling-thread

Steel Grade

in

mm

lb./ft.

lb./ft.

in

mm

H40

J55

L80

N80

C90

T95

P110

2 3/8

2.375

60.32

4.00

0.167

4.24

PU

PN

PN

PN

PN

PN

4.60

4.70

0.190

4.83

PNU

PNU

PNU

PNU

PNU

PNU

PNU

5.80

5.95

0.254

6.45

PNU

PNU

PNU

PNU

PNU

6.60

0.295

7.49

P

P

P

7.35

7.45

0.336

8.53

PU

PU

PU

2 7/8

2.875

73.02

6.40

6.50

0.217

5.51

PNU

PNU

7.80

7.90

0.276

7.01

8.60

8.70

0.308

7.82

PLB

PLB

PLBE

PLB

9.35

9.45

0.340

8.64

PLB

PLB

PLBE

PLB

10.50

0.392

9.96

PLB

PLB

PLB

PLB

11.50

0.440

11.18

PLB

 

3 1/2

3.500

88.90

7.70

0.216

5.49

PN

PN

PN

PN

PN

PN

9.20

9.30

0.254

6.45

PNU

PNU

PNU

PNU

PNU

PNU

PNU

10.20

0.289

7.34

PN

PN

PN

PN

PN

PN

12.70

12.95

0.375

9.52

PNU

PNU

PNU

PNU

PNU

14.30

0.430

10.92

P

P

P

15.50

0.476

12.09

P

P

P

17.00

0.530

13.46

P

P

P

4

4.000

101.60

9.50

0.226

5.74

PN

PN

PN

PN

PN

PN

11.00

0.262

6.65

PU

PU

PU

PU

PU

PU

13.20

0.330

8.38

P

P

P

16.10

0.415

10.54

P

P

P

18.90

0.500

12.70

P

P

P

22.20

0.610

15.49

P

P

P

4 1/2

4.500

114.30

12.60

12.75

0.271

6.88

PNU

PNU

PNU

PNU

PNU

PNU

15.20

0.337

8.56

P

P

P

17.00

0.380

9.65

P

P

P

18.90

0.430

10.92

P

P

P

PLB

21.50

0.500

12.70

P

P

P

PLB

23.70

0.560

14.22

P

P

P

PLB

26.10

0.630

16.00

P

P

P

PLB

P——Plain;N—— Non-upset coupling-thread;U—— Upset coupling-thread; L——Integral

- Specification & Size of API 5CT Casing

DN

O. D.

Weight

W. T.

 

End Machining Form

 

Steel Grade

in

mm

lb/ft

kg/m

in

mm

H40

J55

L80

N80

C90

P110

K55

T95

4 1/2

4.500

114.3

9.50

14.14

0.205

5.21

PS

PS

10.50

15.63

0.224

5.69

PSB

11.60

17.26

0.250

6.35

PSLB

PLB

PLB

PLB

PLB

13.50

20.09

0.290

7.37

PLB

PLB

PLB

PLB

15.10

22.47

0.337

9.56

PLB

5

5.000

127

11.50

17.11

0.220

5.59

PS

13.00

19.35

0.253

6.43

PSLB

15.00

22.32

0.296

7.52

PSLB

PLB

PLB

PLBE

PLB

18.00

26.79

0.362

9.19

PLB

PLB

PLBE

PLB

21.40

31.85

0.437

11.10

PLB

PLB

PLB

PLB

23.20

34.53

0.478

12.14

PLB

24.10

35.86

0.500

12.70

PLB

5 1/2

5.500

139.7

14.00

20.83

0.244

6.20

PS

PS

15.50

23.07

0.275

6.98

PSLB

17.00

25.30

0.304

7.72

PSLB

PLB

PLB

PLBE

PLB

20.00

29.76

0.361

9.17

PLB

PLB

PLBE

PLB

23.00

34.23

0.415

10.54

PLB

PLB

PLBE

PLB

26.80

39.88

0.500

12.70

29.70

44.20

0.562

14.27

32.60

48.51

0.625

15.88

35.30

52.53

0.687

17.45

38.00

56.55

0.750

19.05

40.50

60.27

0.812

20.62

43.10

64.14

0.875

22.22

6 5/8

6.625

168.28

20.00

29.76

0.288

7.32

PS

PSLB

24.00

35.72

0.352

8.94

PSLB

PLB

PLB

PLBE

PLB

28.00

41.67

0.417

10.59

PLB

PLB

PLBE

PLB

32.00

47.62

0.475

12.06

PLB

PLB

PLBE

PLB

7

7.000

177.8

17.00

25.30

0.231

5.87

PS

20.00

29.76

0.272

6.91

PS

PS

23.00

34.23

0.317

8.05

PSLB

PLB

PLB

PLBE

26.00

38.69

0.362

9.19

PSLB

PLB

PLB

PLBE

PLB

29.00

43.16

0.408

10.36

PLB

PLB

PLBE

PLB

32.00

47.62

0.453

11.51

PLB

PLB

PLBE

PLB

35.00

52.09

0.498

12.65

PLB

PLB

PLBE

PLB

38.00

56.55

0.540

13.72

PLB

PLB

PLBE

PLB

42.70

63.54

0.625

15.88

46.40

69.05

0.687

17.45

50.10

74.56

0.750

19.05

53.60

79.77

0.812

20.62

57.10

84.97

0.875

22.22

7 5/8

7.625

193.68

24.00

35.72

0.300

7.62

PS

26.40

39.29

0.328

8.33

PSLB

PLB

PLB

PLBE

PLB

29.70

44.20

0.375

9.52

PLB

PLB

PLBE

PLB

33.70

50.15

0.430

10.92

PLB

PLB

PLBE

PLB

39.00

58.05

0.500

12.70

PLB

PLB

PLBE

PLB

42.80

63.69

0.562

14.27

PLB

PLB

PLB

PLB

45.30

67.41

0.595

15.11

PLB

PLB

PLB

PLB

47.10

70.09

0.625

15.88

PLB

PLB

PLB

PLB

51.20

76.19

0.687

17.45

55.30

80.30

0.750

19.05

8 5/8

8.625

219.08

24.00

35.72

0.264

6.71

PS

28.00

41.62

0.304

7.72

PS

32.00

47.62

0.352

8.94

PS

PSLB

36.00

53.57

0.400

10.16

PSLB

PLB

PLB

PLBE

PLB

40.00

59.53

0.450

11.43

PLB

PLB

PLBE

PLB

44.00

65.48

0.500

12.70

PLB

PLB

PLBE

PLB

49.00

72.92

0.557

14.15

PLB

PLB

PLBE

PLB

9 5/8

9.625

244.48

32.30

48.07

0.312

7.92

PS

36.00

53.57

0.352

8.94

PS

PSLB

40.00

59.53

0.395

10.03

PSLB

PLB

PLB

PLBE

43.50

64.73

0.435

11.05

PLB

PLB

PLBE

PLB

47.00

69.94

0.472

11.99

PLB

PLB

PLBE

PLB

53.50

79.62

0.545

13.84

PLB

PLB

PLBE

PLB

58.40

86.91

0.595

15.11

PLB

PLB

PLB

PLB

59.40

88.40

0.609

15.47

64.90

96.58

0.672

17.07

70.30

104.62

0.734

18.64

75.60

112.50

0.797

20.24

10 3/4

10.750

273.05

32.75

48.74

0.279

7.09

PS

40.50

60.27

0.350

8.89

PS

PSB

15.50

67.71

0.400

10.16

PSB

51.00

75.90

0.450

11.43

PSB

PSB

PSB

PSBE

PSB

55.50

82.59

0.495

12.57

PSB

PSB

PSBE

PSB

60.70

90.33

0.545

13.84

PSBE

PSB

65.70

97.77

0.595

15.11

PSB

PSB

73.20

108.93

0.672

17.07

79.20

117.86

0.734

18.64

85.30

126.94

0.797

20.24

11 3/4

11.750

 

42.00

62.50

0.333

8.46

PS

47.00

69.94

0.375

20.24

54.00

80.36

0.435

8.46

60.00

89.29

0.489

9.53

65.00

96.73

0.534

11.05

71.00

105.66

0.582

14.42

13 3/8

13.375

339.73

48.00

71.43

0.330

8.38

PS

54.50

81.10

0.380

9.65

PSB

61.00

90.78

0.430

10.92

PSB

68.00

101.19

0.480

12.19

PSB

PSB

PSB

PSB

PSB

72.00

107.15

0.514

13.06

PSB

PSB

PSB

PSB

16

16.000

406.4

65.00

96.73

0.375

9.53

PS

75.00

111.61

0.438

11.13

PSB

84.00

125.01

0.495

12.57

PSB

109.00

162.21

0.656

16.66

P

P

P

P

18 5/8

18.625

473.08

87.50

130.21

0.435

11.05

PS

PSB

20

20.000

508

94.00

139.89

0.438

11.13

PSL

PSLB

106.50

158.49

0.500

12.70

PSLB

133.00

197.93

0.635

16.13

PSLB

P——Plain;S——Short-thread;L——Long-thread;B——Buttress thread;E——Extreme thread

 

Chemical Composition (%) of API 5CT

Chemical Composition of API 5CT,Mass Fraction(%

Group

Grade

Type

C

Mn

Mo

Cr

Ni

Cu

P

S

Si

min.

max.

min.

max.

min.

max.

min.

max.

max.

max.

max.

max.

max.

1

H40

0.03

0.030

J55

0.03

0.030

K55

0.03

0.030

N80

1.0

0.03

0.030

N80

Q

0.03

0.030

R95

0.45

1.90

0.03

0.030

0.45

2

M65

0.03

0.030

L80

1

0.43

1.9

0.25

0.35

0.03

0.030

0.45

L80

9Cr

0.15

0.30

0.60

0.90

1.10

8.00

10.00

0.50

0.25

0.02

0.010

1.00

L81

13Cr

0.15

0.22

0.25

1.00

12.00

14.00

0.50

0.25

0.02

0.010

1.00

C90

1.0

0.35

1.20

0.25

0.85

1.50

0.99

0.02

0.010

T95

1.0

0.35

1.20

0.25

0.85

0.40

1.50

0.99

0.02

0.010

C110

0.35

1.20

0.25

1.00

0.40

1.50

0.99

0.02

0.005

3

P110

0.03

0.030

4

Q125

1.00

0.35

1.35

0.85

1.50

0.99

0.02

0.01

a. The carbon content for L80 may be increased up to 0, 50 % maximum if the product is oil-quenched.

b. The molybdenum content for Grade C90 Type 1 has no minimum tolerance if the WT is less than 17, 78 mm.

c. The carbon content for R95 may be increased up to 0, 55 % maximum if the product is oil-quenched.

d. The molybdenum content for T95 Type 1 may be decreased to 0, 15 % minimum if the WT is less than 17, 78 mm.

e. For EW Grade P110, the phosphorus content shall be 0,020 % maximum and the sulfur content 0,010 % maximum

NL = no limit. Elements shown shall be reported in product analysis.

Mechanical Properties of API 5CT

Mechanical Properties

Group

Grade

Type

Total

Yield Strength (Mpa)

Tensile

Hardness max

%

min.

max.

MPa

HRC

HBW

1

H40

0.5

276

552

414

J55

0.5

379

552

517

K55

0.5

379

552

655

N80

1.0

0.5

552

758

689

N80

Q

0.5

552

758

689

R95

0.5

655

758

724

2

M65

0.5

445

586

586

22

235

L80

1

0.5

552

655

655

23

241

L80

9Cr

0.5

552

655

655

23

241

L81

13Cr

0.5

552

655

655

23

241

C90

1.0

0.5

621

724

689

25.4

255

T95

1.0

0.5

655

758

724

25.4

255

C110

0.7

758

828

793

30

286

3

P110

0.6

758

965

862

4

Q125

1.00

0.65

862

1034

931.00

a. In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.

b. No hardness limits, but the maximum variation is controlled by manufacturer acc API 5CT.

API 5CT Dimensional Deviation

Items

Allowable Deviation

Out Diameter

D ≤ 101.60mm

± 0.79mm

D ≥ 114.30mm

+ 1.0%, -0.5%

Wall Thickness

-12.5%

Mass (Single Lengths)

+6.5%, -3.5%

Length Range of API 5CT

Length

Item

Scope 1

Scope 2

Scope 3

Tubing

6.10-7.32m

8.53-9.75m

Casing

4.88-7.62m

7.62-10.36m

10.36-14.63m

API 5CT Pipe Ending Processing

- Flat End / Plain End

A flat end / plain end pipe is a pipe that has unmachined threads. It may or may not upset, but it must fulfill all of the specifications for a certain steel grade in this standard.

- Threaded End

Casings with short or long threads are available in steel grades H40, J55, K55, or M65. If the buyer wants a long-threaded case, he or she should specify it on the order.

- Rounded Nose

To replace the conventional corner breaks on the threaded ends of external upset tubing, the manufacturer or purchaser may specify a “round” or “bullet-nose” style pipe end. To enable coating application and to ensure that the inner and outer surfaces are smooth and free of sharp edges or burrs, the modified end should be rounded.

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