API 5CT N80 Tubing

API 5CT N80 Tubing

API 5CT J55 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT J55 Casing Tubing in accordance with the API 5CT standard, it is available as short thread type and long thread type supplied with their couplings. According to American...

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  • API 5CT J55 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT J55 Casing Tubing in accordance with the API 5CT  standard, it is available as short thread type and long thread type supplied with their couplings.

  • According to American Petroleum Institute Standard API SPEC 5CT1988 1st edition, the steel grade of API 5CT oil casing pipe can be divided into ten types, including H-40, J-55K-55N-80, C-75, L-80C-90C-95P-110 and Q-125. We supply the casing pipe & API 5CT J55 Casing Tubing accompanied with thread and coupling, or we offer our product in accordance with the following forms for option.


API 5CT  Casing Tubing Chemical Composition, mass fraction (%)

GroupGradeTypeCMnMoCrNi max.Cu max.P max.S max.Si max.
min.max.min.max.min.max.min.max.
12345678910111213141516

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

-

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 wall thickness 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 wall thickness 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.

API 5CT Casing Tubing Tensile and hardness requirements

GroupGradeTypeTotal elongation under load %Yield strength MPaTensile strength min. MPaHardness a max.Specified wall thickness mmAllowable hardness variation b HRC
min.max . HRCHBW
1234567891011
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

a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. 
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9 of API Spec. 5CT.

API 5CT Casing Tubing Steel color code

NameJ55K55N80-1N80-QL80-1P110
Casinga bright green bandtwo bright green bandsa bright red banda bright red band + a green banda red band + a brown banda bright white band
Couplingentire green coupling + a white bandentire green couplingentire red couplingentire red coupling + a green bandentire red coupling + a brown bandentire white coupling


  • Available Sizes:   2 3/8″, 2 7/8″ and 3 ½” Outer Diameter

  • Macaroni Tubing: 1 1/4 “ – 2 1/16” Nom.

  • Grades:  J55, J55, N80,  L80, P110

  • End Finishing: External Upset Ends (EUE), PH6 (and equivalent connections), Flush Joint, Integral Joint (IJ)

  • Specialties:

    • Threading

    • Heat treating

    • External upset

    • Drifting (Full-length, or just ends)

    • Hydrostatic Testing

    • Full third-party inspection capabilities (EMI, SEA, and Weld Line)

    • Couplings – EUE, AB Modified, turned down, special clearance couplings

    • Coating to customer specifications

    • Pup Joints



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