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carbon steel pipe

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OCTG CASING PIPES

TYPES OF OCTG PIPE

First, OCTG is the acronym of “Oil Country Tubular Goods” – i.e. pipes for oil (and gas) extraction from the soil. The three main OCTG pipe types are:

1, Casing pipes are used to stabilize the wellbore. A casing pipe is subject to axial tensions and to internal pressures generated by the pumped oil or gas, by their heavyweight and the external pressures coming from the surrounding rocks

2, Tubing pipes are tubular goods through which the oil or gas is transported from the wellbore to the surface. Tubing segments are generally around 30′ long with a threaded connection on each end (standard or premium connections are available)

3, Drill pipes are heavyweight seamless tubular that rotate the drill bit and circulates the drilling fluid. Pipe segments of 30′ are coupled with tool joints. Drill pipe is subject to high torque by drilling, axial tension by their weight, and internal pressure due to the purging of the drilling fluid. Additionally, alternating bending loads due to non-vertical or deflected drilling may be superimposed on these basic loading patterns

OCTG PIPE MATERIALS

API5CT MATERIALS CHEMICAL COMPOSITION

Group

OCTG pipe materials

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

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

R95

0.45 c

1.9

0.03

0.03

0.45

2

M65

0.03

0.03

L80

1

0.43 a

1.9

0.25

0.35

0.03

0.03

0.45

L80

9Cr

0.15

0.3

0.6

0.9

1.1

8

10

0.5

0.25

0.02

0.01

1

L80

13Cr

0.15

0.22

0.25

1

12

14

0.5

0.25

0.02

0.01

1

C90

1

0.35

1.2

0.25 b

0.85

1.5

0.99

0.02

0.01

T95

1

0.35

1.2

0.25 d

0.85

0.4

1.5

0.99

0.02

0.01

C110

0.35

1.2

0.25

1

0.4

1.5

0.99

0.02

0.005

3

P110

e

0.030 e

0.030 e

4

Q125

1

0.35

1.35

0.85

1.5

0.99

0.02

0.01


OCTG PIPE MATERIALS – MECHANICAL PROPERTIES

Group

OCTG pipe materials

Type

Total elongation under load %

Yield strength MPa

Tensile strength min. MPa

Hardness a max.

Specified wall thickness mm

Allowable hardness variation b HRC

min.

max .

HRC

HBW

1

2

3

4

5

6

7

8

9

10

11

1

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

R95

0.5

655

758

724

2

M65

0.5

448

586

586

22

235

L80

1

0.5

552

655

655

23

241

L80

9Cr

0.5

552

655

655

23

241

L80

13Cr

0.5

552

655

655

23

241

C90

1

0.5

621

724

689

25.4

255

≤ 12.70 12.71 to 19.04 19.05 to 25.39 ≥ 25.40

3.0 4.0 5.0 6.0

T95

1

0.5

655

758

724

25.4

255

≤ 12.70 12.71 to 19.04 19.05 to 25.39 ≥ 25.40

3.0 4.0 5.0 6.0

C110

0.7

758

828

793

30

286

≤ 12.70 12.71 to 19.04 19.05 to 25.39. ≥ 25.40

3.0 4.0 5.0 6.0

3

P110

0.6

758

965

862

4

Q125

1

0.65

862

1034

931

b

≤ 12.70 12.71 to 19.04 ≥ 19.05

3.0 4.0 5.0

Factory Display

Other Types

ce certification sch40 seamless steel pipe ce certification astm 519 seamless steel pipe
ce certification seamless carbon steel pipe ce certification astm a106 grade b seamless steel pipe
ce certification seamless steel pipe ce certification astm a106 seamless steel pipe
ce certification seamless steel pipe api 5l ce certification astm a53 seamless steel pipe
ce certification seamless steel pipe line pipe ce certification carbon seamless steel pipe
ce certification seamless steel pipe st37 ce certification carbon steel seamless pipe
ce certification seamless steel pipes ce certification cold drawn seamless steel pipe
ce certification steel pipe seamless ce certification sch 40 seamless steel pipe

Application Field

Oil & Gas
Oil & Gas
Chemical Industry
Chemical Industry
Marine Engineering
Marine Engineering
Construction Industry
Construction Industry
Power Generation
Power Generation
Machinery industry
Machinery industry