API 5CT N80

API 5CT N80

API 5CT N80 oilfield casing pipe is available in N80-1 and N80-Q varieties. The chemical composition and mechanical properties of these two materials are identical; the only difference is in the heat treatment.

API 5CT N80-1 steel is heat-treated by normalizing and tempering, whereas API 5CT N80Q steel is heat-treated by quenching and tempering. As a result, the collapse and internal pressure strengths of N80Q are greater than those of N80-1. When the N80 case is used, the designer should clearly display N80-1 or N80Q.

Because of the high capability of N80 material, API-5CT casing pipes are widely used in natural gas, coal bed methane extraction, and geothermal wells.

PRODUCT FEATURES

Product Description of API 5CT N80

Product Name

API-5CT N80      

Size

O. D

26.67-508mm

W. T

2.87-16.13mm

Length

R1(5.49-6.71m),R2(8.23-9.14m),R3(11.58-13.72m)

Type of End Finish

  1. Plain end
  2. Short round thread
  3. Long round thread
  4. Buttress thread

Surface

  1. Black Painted
  2. With oil
  3. Bared or as per customers’ requirement

Standard

API 5CT

Application

Tube for conveying gas, water, and oil in both and natural gas industries, etc.

Chemical Composition of API 5CT N80

Group

Grade

Type

C

Mn

Mo

Cr

Ni max.

Cu max.

P max.

S max.

Si max.

min.

max.

min.

max.

min.

max.

min.

max.

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

 

N80

1

0.03

0.03

 

N80

Q

0.03

0.03

Mechanical Analysis of API 5CT N80

API 5CT Casing Pipe Standard

API 5CT Casing Pipe Type

API 5CT Casing Pipe Tensile Strength
MPa

API 5CT Casing Pipe Yield Strength
MPa

API 5CT Casing Pipe Hardness
Max.

API SPEC 5CT

1/Q

≥689

552 ~ 758

—-

Test of API 5CT N80 Steel Pipe

  • Chemical Component Analysis.
  • Mechanical Properties (Ultimate tensile strength, Yield strength, Elongation).
  • Technical Properties (Flattening Test, Flaring Test, Bending Test, Hardness Test, Blow Test, Impact Test, etc.
  • Exterior Size Inspection.
  • Nondestructive Test (Ultrasonic flaw detector, Eddy current flaw detector), Hydrostatic Test.

API 5CT N80 Casing and Tubing Specifications

Code a

Outer Diameter

Nominal Weight
(with thread and
coupling) b, c

Wall Thickness

End Processing Type

mm

kg/m

mm

N801

In

Lb/ft

N80Q

1

2

3

4

5

10

4-1-2

9.5

114.3

14.14

5.21

4-1-2

10.5

114.3

15.63

5.69

4-1-2

11.6

114.3

17.26

6.35

4-1-2

13.5

114.3

20.09

7.37

LB

4-1-2

15.1

114.3

22.47

8.56

5

11.5

127

17.11

5.59

5

13

127

19.35

6.43

5

15

127

22.32

7.52

5

18

127

26.79

9.19

LB

5

21.4

127

31.85

11.1

LB

5

23.2

127

34.53

12.14

5

24.1

127

35.86

12.7

5-1-2

14

139.7

20.83

6.2

5-1-2

15.5

139.7

23.07

6.98

5-1-2

17

139.7

25.3

7.72

LB

5-1-2

20

139.7

29.76

9.17

5-1-2

23

139.7

34.23

10.54

LB

6-5-8

20

168.28

29.76

7.32

6-5-8

24

168.28

35.72

8.94

6-5-8

28

168.28

41.67

10.59

LB

6-5-8

32

168.28

47.62

12.06

7

17

177.8

25.3

5.87

7

20

177.8

29.76

6.91

7

23

177.8

34.23

8.05

7

26

177.8

38.69

9.19

LB

7

29

177.8

43.16

10.36

7

32

177.8

47.62

11.51

7

35

177.8

52.09

12.65

LB

7-5-8

24

193.68

35.72

7.62

7-5-8

26.4

193.68

39.29

8.33

7-5-8

29.7

193.68

44.2

9.52

7-5-8

33.7

193.68

50.15

10.92

7-5-8

39

193.68

58.04

12.7

LB

7-5-8

42.8

193.68

63.69

14.27

7-5-8

45.3

193.68

67.41

15.11

7-5-8

47.1

193.68

70.09

15.88

8-5-8

24

219.08

35.72

6.71

8-5-8

28

219.08

41.67

7.72

8-5-8

32

219.08

47.62

8.94

8-5-8

36

219.08

53.57

10.16

LB

8-5-8

40

219.08

59.53

11.43

LB

8-5-8

44

219.08

65.48

12.7

8-5-8

49

219.08

72.92

14.15

Code a

Outer Diameter

Nominal Weight
(with thread and coupling) b, c

Wall Thickness

End Processing Type

mm

kg/m

mm

J55

In

Lb/ft

K55

1

2

3

4

5

7

9-5-8

32.3

244.48

48.07

7.92

9-5-8

36

244.48

53.57

8.94

9-5-8

40

244.48

59.53

10.03

LB

9-5-8

43.5

244.48

64.73

11.05

LB

9-5-8

47

244.48

69.94

11.99

9-5-8

53.5

244.48

79.62

13.84

9-5-8

58.4

244.48

86.91

15.11

10-3-4

32.75

273.05

48.74

7.09

10-3-4

40.5

273.05

60.27

8.89

10-3-4

45.5

273.05

67.71

10.16

10-3-4

51

273.05

75.9

11.43

SB

10-3-4

55.5

273.05

82.59

12.57

SB

10-3-4

60.7

273.05

90.33

13.84

10-3-4

65.7

273.05

97.77

15.11

11-3-4

42

298.45

62.5

8.46

11-3-4

47

298.45

69.94

9.53

11-3-4

54

298.45

80.36

11.05

11-3-4

60

298.45

89.29

12.42

SB

13-3-8

48

339.72

71.43

8.38

13-3-8

54.5

339.72

81.1

9.65

13-3-8

61

339.72

90.78

10.92

13-3-8

68

339.72

101.19

12.19

SB

13-3-8

72

339.72

107.15

13.06

SB

16

65

406.4

96.73

9.53

16

75

406.4

111.61

11.13

16

84

406.4

125.01

12.57

18-5-8

87.5

473.08

130.21

11.05

20

94

508

139.89

11.13

20

106.5

508

158.49

12.7

20

133

508

197.93

16.13

S-Short round thread, L-Long round thread, B-Buttress thread

a. Code is used for ordering reference.

b. The nominal weight of threaded and coupled casing (column 2) is shown for reference only.

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