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API 5CT Casing Pipe


Dimension:OD: 114.3-508mm WT: 5.21-16.13mm

Grade:Casing：J55, K55, N80-1,N80-Q, L80-1, L80-9Cr,L80-13Cr,C95, P110,Q125.

Thread types:STC,LTC,BTC etc


Standards and Technical Conditions for Supply: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 

Casings are used for fixing the well wall or down hole, which have wider diameters, can he divided into conductor casings, technical casings and Oil casings. 


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Description

API SPEC 5CT well casing is utilized in fixing the well wall or down hole, which has wider diameters. API SPEC 5CT can be divided into conductor casing, technical casing and oil casing.

API 5CT Casing

Range 1

Range 2

Range 3

4.88~7.62 

7.62~10.36

10.36~14.63

Casing&tubing and their colors:


Specification

Labels

OD(mm)

WT(mm)

J55/K55

N80

L80

C90/T95

P110

Q125

4 1/2

9.5

114.3

5.21

PS

-

-

-

-

-

10.5

114.3

5.69

PSB

-

-

-

-

-

11.6

114.3

6.36

PSLB

PLB

PLB

PLB

PLB

-

13.5

114.3

7.37

-

PLB

PLB

PLB

PLB

-

15.1

114.3

8.56

-

-

-

-

PLB

PLB

5

11.5

127

5.59

PS

-

-

-

-

-

13

6.43

PSLB

-

-

-

-

-

15

7.52

PSLBE

PLBE

PLBE

PLBE

PLBE

-

18

9.19

-

PLBE

PLBE

PLBE

PLBE

PLBE

21.4

11.10

-

PLB

PLB

PLB

PLB

PLB

23.2

12.14

-

PLB

PLB

PLB

PLB

PLB

24.1

12.7

-

PLB

PLB

PLB

PLB

PLB

5 1/2

14

139.7

6.20

PS

-

-

-

-

-

15.5

6.98

PSLBE

-

-

-

-

-

17

7.72

PSLBE

PLBE

PLBE

PLBE

PLBE

-

20

9.17

-

PLBE

PLBE

PLBE

PLBE

-

23

10.54

-

PLBE

PLBE

PLBE

PLBE

PLBE

26.8

12.7

-

-

-

P

-

-

29.7

14.27

-

-

-

P

-

-

32.6

15.88

-

-

-

P

-

-

35.3

17.45

-

-

-

P

-

-

38

19.05

-

-

-

P

-

-

40.5

20.62

-

-

-

P

-

-

43.1

64.14

-

-

-

P

-

-

6 5/8

20

168.28

7.32

PSLB






24

8.94

PSLBE

PLBE

PLBE

PLBE

PLBE

-

28

10.59

-

PLBE

PLBE

PLBE

PLBE

-

32

12.06

-

PLBE

PLBE

PLBE

PLBE

PLBE

7

20

177.8

6.91

PS






23

8.05

PSLBE

PLBE

PLBE

PLBE

-

-

26

9.19

PSLBE

PLBE

PLBE

PLBE

PLBE

-

29

10.6


PLBE

PLBE

PLBE

PLBE


32

11.51


PLBE

PLBE

PLBE

PLBE


35

12.65


PLBE

PLBE

PLBE

PLBE

PLBE

38

13.72


PLBE

PLBE

PLBE

PLBE

PLBE

7 5/8

26.4

193.67

8.33

PSLBE

PLBE

PLBE

PLBE

-

-

29.7

9.52

-

PLBE

PLBE

PLBE

PLBE

-

33.7

10.92

-

PLBE

PLBE

PLBE

PLBE

-

39

12.7

-

PLBE

PLBE

PLBE

PLBE

PLBE

42.8

14.27

-

PLB

PLB

PLB

PLB

PLB

45.3

15.11

-

PLB

PLB

PLB

PLB

PLB

47.1

15.88

-

PLB

PLB

PLB

PLB

PLB

8 5/8

24

219.08

6.71

PS

-

-

-

-

-

28

7.72

-

-

-

-

-

-

32

8.94

PSLBE

-

-

-

-

-

36

10.16

PSLBE

PLBE

PLBE

PLBE

-

-

40

11.43

-

PLBE

PLBE

PLBE

PLBE

-

44

12.70

-

PLBE

PLBE

PLBE

PLBE

-

49

14.15

-

PLBE

PLBE

PLBE

PLBE

PLBE

9 5/8

36

244.48

8.94

PSLB

-

-

-

-

-

40

10.03

PSLBE

PLBE

PLBE

PLBE

-

-

43.5

11.05

-

PLBE

PLBE

PLBE

PLBE


47

11.99

-

PLBE

PLBE

PLBE

PLBE

PLBE

53.5

13.84

-

PLBE

PLBE

PLBE

PLBE

PLBE

58.4

15.11

-

PLB

PLB

PLB

PLB

PLB

10 3/4

40.5

273.05

8.89

PSB

-

-

-

-

-

45.5

10.16

PSBE

-

-

-

-

-

51

11.43

PSBE

PSBE

PSBE

PSBE

PSBE

-

55

12.57

-

PSBE

PSBE

PSBE

PSBE

-

60.7

13.84

-

-

-

PSBE

PSBE

PSBE

65.7

15.11

-

-

-

PSB

PSB

PSB

113/4

47

298.45

9.53

PSB

-

-

-

-

-

54

11.05

PSB

-

-

-

-

-

60

12.42

PSB

PSB

PSB

PSB

PSB

PSB

13 3/8

48

339.72

8.38

-

-

-

-

-

-

54.5

9.65

PSB

-

-

-

-

-

61

10.92

PSB

-

-

-

-


68

12.19

PSB

PSB

PSB

PSB

PSB

-

72

13.06

-

PSB

PSB

PSB

PSB

PSB

16

75

406

11.13

PSB

-

-

-

-

-

84

12.57

PSB

-

-

-

-

-

109

16.66

P

P

P

-

P

P

20

94

508

11.13

PSLB

-

-

-

-

-

30

96

762

16.13

PSLB

-

-

-

-

-

P-Plain end; S-Short round thread; L-Long round thread; B-Buttress thread; E-Extreme line;

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

Mechanical Properties

Grade

类型Type

Total elongation 

under load %

Yield Strength M pa

Tensile strength 

min Mpa

Hardness

 Specified wall thickness mm

Allowable hardness variation

HRC

min

max

HRC

HBW

J55

-

0.5

379

552

517

-

-

-

-

K55

-

0.5

379

552

655

-

-

-

-


N80


1

0.5

552

758

689

-

-

-

-

Q

0.5

552

758

689

-

-

-

-

M65

-

0.5

448

586

586

22

235

-

-


L80


1

0.5

552

655

655

23

241

-

-

9Cr

0.5

552

655

655

23

241

-

-

13Cr

0.5

552

655

655

23

241

-

-

C90

1、2

0.5

621

724

689

25.4

255

≤12.70

3.0

1、2

0.5

621

724

689

25.4

255

12.71-19.04

4.0

1、2

0.5

621

724

689

25.4

255

19.05-25.39

5.0

1、2

0.5

621

724

689

25.4

255

≥25.4

6.0

C95

-

0.5

655

724

724

-

-

-

-

T95

1、2

0.5

655

724

724

25.4

255

≤12.70

3.0

1、2

0.5

655

724

724

25.4

255

12.71-19.04

4.0

1、2

0.5

655

724

724

25.4

255

19.05-25.39

5.0

1、2

0.5

655

724

724

25.4

255

≥25.4

6.0

P110

-

0.6

758

965

862

-

-

-

-

Q125

All

0.65

862

1034

931

b

-

≤12.70

3.0

All

0.65

862

1034

931

b

-

12.71-19.04

4.0

All

0.65

862

1034

931

b

-

≥19.05

5.0

Chemical Composition

Standard

Grade

Composition（%）

C

Si

Mn

P

S

Cr

Ni

Cu

Mo

V

AIs

API SPEC 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

K55·

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

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

P110

0.26～0.35

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

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