API Casing & Tubing Pipes

General Description

API 5CT casing pipe is used to support the oil and gas pipe wall, and to ensure the drilling process and the post-completion well’s normal operation. Depending on the depth of drilling and geological conditions, each well will use several layers of casing. Unlike tubing and drill pipe, after cementing casing pipes can not be reused, a one-time consumable materials. Therefore, the casing consumption accounts for over 70% of all the oil well pipes. According to usage, it can be divided into the sleeve pipe, surface casing, casing and production casing.

OCTG tubing pipe goes inside the casing pipe because it is the pipe through which oil makes its way out. Tubing is the simplest part of OCTG and it is normally found in the length of 30 ft (9 m), with threaded connection at both ends. The pipe is either used to transport natural gas or crude oil from the producing formation to the facilities where it will be processed after drilling is complete.

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Product Details

Chemical Composition (API 5CT)

Group

Steel Grade

Type

C

Mn

Mo

Cr

Ni

Cu

P

S

Si

min.

max.

min.

max.

min.

max.

min.

max.

min.

max.

max.

max.

max.

1

H40

-

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

J55

-

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

K55

-

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

N80

1

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

Q

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

2

M65

-

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

L80

1

-

0.43

-

1.9

-

-

-

-

0.25

0.35

0.03

0.03

0.5

9Cr

-

0.15

0.3

0.6

0.9

1.1

8

10

0.5

0.25

0.02

0.01

1.0

13Cr

0.15

0.22

0.25

1

-

-

12

14

0.5

0.25

0.02

0.01

1.0

C90

1

-

0.35

-

1.2

0.25

0.85

-

1.5

0.99

-

0.02

0.01

-

2

-

0.5

-

1.9

-

NL

-

NL

0.99

-

0.03

0.01

-

C95

-

-

0.45

-

1.9

-

-

-

-

-

-

0.03

0.03

0.5

T95

1

-

0.35

-

1.2

0.25

0.85

0.4

1.5

0.99

-

0.02

0.01

-

2

-

0.5

-

1.9

-

-

-

-

0.99

-

0.03

0.01

-

3

P110

-

-

-

-

-

-

-

-

-

-

-

0.03

0.03

-

4

Q125

1

-

0.35

-

1.35

-

0.85

-

1.5

0.99

-

0.02

0.01

-

2

-

0.35

-

1

-

NL

-

NL

0.99

-

0.02

0.02

-

3

-

0.5

-

1.9

-

NL

-

NL

0.99

-

0.03

0.01

-

4

-

0.5

-

1.9

-

NL

-

NL

0.99

-

0.03

0.02

-

Mechanical Properties (API 5CT）

Group

Steel Grade

Type

Elongation
%

Yield Strength
MPa

Tensile Strength
Mpa

Hardness
max

Specified Wall Thickness
mm

Hardness Allowance

min.

max.

min.

HRC

HBW

1

H40

-

0.5

276

552

414

-

-

-

-

J55

-

379

552

517

-

-

-

-

K55

-

379

552

655

-

-

-

-

N80

1

552

758

689

-

-

-

-

Q

552

758

689

-

-

-

-

2

M65

-

0.5

448

586

586

22

235

-

-

L80

1

552

655

655

23

241

-

-

9Cr

552

655

655

23

241

-

-

13Cr

552

655

655

23

241

-

-

C90

1、2

621

724

689

25.4

255

≤ 12.70

3.0

621

724

689

25.4

255

12.71 ~ 19.04

4.0

621

724

689

25.4

255

19.05 ~ 25.39

5.0

621

724

689

25.4

255

≥25.40

6.0

C95

-

655

758

724

-

-

-

-

T95

1、2

655

758

724

25.4

255

≤ 12.70

3.0

655

758

724

25.4

255

12.71 ~ 19.04

4.0

655

758

724

25.4

255

19.05 ~ 25.39

5.0

655

758

724

25.4

255

≥25.40

6.0

3

P110

-

0.6

758

965

862

-

-

-

-

4

Q125

All

0.65

862

1034

931

-

-

≤ 12.70

3.0

862

1034

931

-

-

12.71 ~ 19.04

4.0

862

1034

931

-

-

≥19.05

5.0

API Casing Pipe Size Chart

Size	Outside Diameter		Weight		Wall Thickness		Connection Type
	Outside Diameter		Weight		Wall Thickness		Steel Grade
	in	mm	lb/ft	kg/m	in	mm	H40	J55	L80	N80	C90	P110
	in	mm	lb/ft	kg/m	in	mm	H40	K55	L80	N80	T95	P110
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	–	–	–	–
Note: P: Plain End; S: Short Round Thread; L: Long Round Thread; B: Buttress Thread; E: Extreme-line Casing

API Tubing Pipe Size Chart

Size

Outside Diameter

Weight

Wall Thickness

Connection Type

Non-Upset,

with Thread & Coupling

External Upset,

with Thread & Coupling

Integral Connection

Steel Grade

in

mm

lb/ft

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

Note:

P: Plain End; N: Non-Upset; U: External Upset; I: Integral Connection

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Next：Torque Rings

Group	Steel Grade	Type	C		Mn		Mo		Cr		Ni	Cu	P	S	Si
Group	Steel Grade	Type	min.	max.	min.	max.	min.	max.	min.	max.	min.	max.	max.	max.	max.
1	H40	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	J55	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	K55	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	N80	1	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	N80	Q	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
2	M65	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	L80	1	-	0.43	-	1.9	-	-	-	-	0.25	0.35	0.03	0.03	0.5
		9Cr	-	0.15	0.3	0.6	0.9	1.1	8	10	0.5	0.25	0.02	0.01	1.0
		13Cr	0.15	0.22	0.25	1	-	-	12	14	0.5	0.25	0.02	0.01	1.0
	C90	1	-	0.35	-	1.2	0.25	0.85	-	1.5	0.99	-	0.02	0.01	-
	C90	2	-	0.5	-	1.9	-	NL	-	NL	0.99	-	0.03	0.01	-
	C95	-	-	0.45	-	1.9	-	-	-	-	-	-	0.03	0.03	0.5
	T95	1	-	0.35	-	1.2	0.25	0.85	0.4	1.5	0.99	-	0.02	0.01	-
	T95	2	-	0.5	-	1.9	-	-	-	-	0.99	-	0.03	0.01	-
3	P110	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
4	Q125	1	-	0.35	-	1.35	-	0.85	-	1.5	0.99	-	0.02	0.01	-
		2	-	0.35	-	1	-	NL	-	NL	0.99	-	0.02	0.02	-
		3	-	0.5	-	1.9	-	NL	-	NL	0.99	-	0.03	0.01	-
		4	-	0.5	-	1.9	-	NL	-	NL	0.99	-	0.03	0.02	-