What is K55 material?

Author: Polly

Apr. 29, 2024

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Tags: Mechanical Parts & Fabrication Services

K55 - Chemical Composition

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API 5CT K55 Casing

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API 5CT K55 Casing Tubing is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacture API 5CT K55 Casing Tubing in accordance with the SY/T6194-96 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-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110 and Q-125. We supply the casing pipe & API 5CT K55 Casing Tubing accompanied with thread and coupling, or we offer our product in accordance with the following forms for option. If you are interested in API 5CT K55 Casing Tubing, we will supply you with the best price based on the highest quality

What is API 5CT K55 Casing Tubing?

OCTG: Oil country tubular goods is the classification used for a variety of downhole products API 5CT K55 Casing Tubing serves to transport both crude oil and natural gas from oil and gas layer to the surface pipeline after drilling is completed. It is able to bear the pressure produced by the exploitation process. After the outer surface is coated with a protective layer, the tubing is marked in accordance with the API 5CT standard and strapped with metal belt. Our oilfield tubing & API 5CT K55 Casing Tubing can be widely applicable to petroleum, construction, shipbuilding, smelting, aviation, electric power, food, paper, chemical industry, medical equipment, boilers, heat exchangers, metallurgy and so on. This oilfield tubing can be classified as NUE type and EUE type. You can find here Casing Dimensions & Casing Wall Thickness. Specifications include 1.9in(48.3mm), 2 3/8in(60.3mm), 2 7/8in(73.03mm), 3 1/2in(88.9mm), 4in(101.6mm), 4 1/2in(114.3mm) etc. The depth of our product for descending the well is basically identical to that of oil casing pipe. Both mechanical property and sealing performance of this tubing are also required to correspond with the oil casing pipe. Petroleum Tubing main steel grade includes J55, N80, C90, P110 and some others. for more details check below Casing And Tubing Tables, Casing Grade Table, & Casing Data Tables.

API 5CT K55 Casing:

K55 Casing is placed downhole to provide structural integrity to the wellbore and must withstand external-collapse pressure from rock formations and internal-yield pressure from fluid and gas. It must also hold its own deadweight and withstand the torque and transaxial pressure placed on it while running downhole.

API 5CT K55 Tubing:

K55 Tubing is placed within the casing. It is used to transport oil and gas from the source rock to the wellhead.

API 5CT K55 Casing Tubing Specification

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-FBNAU, N80, L80, P110 End Finishing: External Upset Ends (EUE), PH6 (and equivalent connections), Flush Joint, Integral Joint (IJ)

Casing Pipe Specifications Standards: API SPEC 5CT Model in Common Use: 2-3/8", 2-7/8", 3-1/2", 4", 4-1/2" Length Range: R1(6.10-7.32m), R2(8.53-9.75m), R3(11.58-12.8m) Steel Grade (Casing Grades, Tubing Grades): J55, K55, N80-1, N80-Q, L80, P110 Type of Screw Thread: Non upset threaded end(NUE), External upset threaded end(EUE) 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

PRODUCT GRADE DIAMETER END TYPE K55 TUBING J55, JFBNAU, L80, P110, 1% Chrome 2.375" – 3.5" Plain End EUE 8RD K55 CASING J-55, L80 HC, P110 HC 4.5" – 9.625" (J55, L80 HC, P110 HC) 10.75” - 20” (J55) Plain End, STC, LTC, BTC OD Wall PE # / ft T&C # / ft Collar API Drift Available Grades 2.375″ .190 4.44 4.7 EUE, AB MOD 1.901 J55, J-FBNAU, N80, L80, P110 2.875″ .217 6.17 6.5 EUE, AB MOD 2.347 J55, J-FBNAU, N80, L80, P110 3.5″ .254 8.81 9.3 EUE, AB MOD 2.867 J55, J-FBNAU, N80, L80, P110 Pipe Casing Sizes, Oilfield Casing Sizes & Casing Drift Sizes Outer Diameter (Casing Pipe Sizes) 4 1/2"-20", (114.3-508mm) Standard Casing Sizes 4 1/2"-20", (114.3-508mm) Thread Type Buttress thread casing, Long round thread casing, Short round thread casing Function It can protect the tubing pipe. Name of Pipes Specification Steel Grade Standard D (S) (L) (mm) (mm) (m) Petroleum Casing Pipe

127-508

5.21-16.66

6-12

J55. M55. K55. L80. N80. P110.

API Spec 5CT (8) Petroleum Tubing

26.7-114.3

2.87-16.00

6-12

J55. M55. K55. L80. N80. P110.

API Spec 5CT (8) Coupling

127-533.4

12.5-15

6-12

J55. M55. K55. L80. N80. P110.

API Spec 5CT (8)

API 5CT K55 Casing Tubing Chemical Composition, mass fraction (%)

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

H40

0.03

J55

0.03

K55

0.03

N80

0.03

N80

0.03

R95

0.45 c

1.9

0.03

0.45

M65

0.03

L80

0.43 a

1.9

0.25

0.35

0.03

0.45

L80

9Cr

0.15

0.3

0.6

0.9

1.1

0.5

0.25

0.02

0.01

L80

13Cr

0.15

0.22

0.25

0.5

0.25

0.02

0.01

C90

0.35

1.2

0.25 b

0.85

1.5

0.99

0.02

0.01

T95

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

0.4

1.5

0.99

0.02

0.005

P110

0.030 e

Q125

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 K55 Casing Tubing Mechanical Properties

Standard Type Tensile Strength MPa Yield Strength MPa Hardness Max. API SPEC 5CT J55 ≥517 379 ~ 552 ---- K55 ≥517 ≥655 --- N80 ≥689 552 ~ 758 --- L80(13Cr) ≥655 552 ~ 655 ≤241HB P110 ≥862 758 ~ 965 ----

API 5CT K55 Casing Tubing Tensile and hardness requirements

Group Grade 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

0.5

552

758

689

N80

0.5

552

758

689

R95

0.5

655

758

724

M65

0.5

448

586

235

L80

0.5

552

655

241

L80

9Cr

0.5

552

655

241

L80

13Cr

0.5

552

655

241

C90

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

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

286

≤ 12.70 12.71 to 19.04 19.05 to 25.39. ≥ 25.40

3.0 4.0 5.0 6.0

P110

0.6

758

965

862

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Q125

0.65

862

1034

931

≤ 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 K55 Casing Tubing Steel color code

Name J55 K55 N80-1 N80-Q L80-1 P110 Casing a bright green band two bright green bands a bright red band a bright red band + a green band a red band + a brown band a bright white band Coupling entire green coupling + a white band entire green coupling entire red coupling entire red coupling + a green band entire red coupling + a brown band entire white coupling

ISO/API casing/ API 5CT K55 Casing Tubing specifications

Codea Outer Dia Nominal weight (with thread and coupling) b,c Wall Thickness End processing type mm kg/m mm H40 J55 M65 L80 N801 C90d P110 Q125d In Lb/ft K55 C95 N80Q T95d 1 2 3 4 5 6 7 8 9 10 11 12 13 4-1-2 9.5 114.3 14.14 5.21 S S S - - - - - 4-1-2 10.5 114.3 15.63 5.69 - SB SB - - - - - 4-1-2 11.6 114.3 17.26 6.35 - SLB LB LB LB LB LB - 4-1-2 13.5 114.3 20.09 7.37 - - LB LB LB LB LB - 4-1-2 15.1 114.3 22.47 8.56 - - - - - - LB LB 5 11.5 127 17.11 5.59 - S S - - - - - 5 13 127 19.35 6.43 - SLB SLB - - - - - 5 15 127 22.32 7.52 - SLB LB LB LB LB LB - 5 18 127 26.79 9.19 - - LB LB LB LB LB LB 5 21.4 127 31.85 11.1 - - LB LB LB LB LB LB 5 23.2 127 34.53 12.14 - - - LB LB LB LB LB 5 24.1 127 35.86 12.7 - - - LB LB LB LB LB 5-1-2 14 139.7 20.83 6.2 S S S - - - - - 5-1-2 15.5 139.7 23.07 6.98 - SLB SLB - - - - - 5-1-2 17 139.7 25.3 7.72 - SLB LB LB LB LB LB - 5-1-2 20 139.7 29.76 9.17 - - LB LB LB LB LB - 5-1-2 23 139.7 34.23 10.54 - - LB LB LB LB LB LB 6-5-8 20 168.28 29.76 7.32 S SLB SLB - - - - - 6-5-8 24 168.28 35.72 8.94 - SLB LB LB LB LB LB - 6-5-8 28 168.28 41.67 10.59 - - LB LB LB LB LB - 6-5-8 32 168.28 47.62 12.06 - - - LB LB LB LB LB 7 17 177.8 25.3 5.87 S - - - - - - - 7 20 177.8 29.76 6.91 S S S - - - - - 7 23 177.8 34.23 8.05 - SLB LB LB LB LB - - 7 26 177.8 38.69 9.19 - SLB LB LB LB LB LB - 7 29 177.8 43.16 10.36 - - LB LB LB LB LB - 7 32 177.8 47.62 11.51 - - LB LB LB LB LB - 7 35 177.8 52.09 12.65 - - - LB LB LB LB LB 7-5-8 24 193.68 35.72 7.62 S - - - - - - - 7-5-8 26.4 193.68 39.29 8.33 - SLB SLB LB LB LB LB - 7-5-8 29.7 193.68 44.2 9.52 - - LB LB LB LB LB - 7-5-8 33.7 193.68 50.15 10.92 - - LB LB LB LB LB - 7-5-8 39 193.68 58.04 12.7 - - - LB LB LB LB LB 7-5-8 42.8 193.68 63.69 14.27 - - - LB LB LB LB LB 7-5-8 45.3 193.68 67.41 15.11 - - - LB LB LB LB LB 7-5-8 47.1 193.68 70.09 15.88 - - - LB LB LB LB LB 8-5-8 24 219.08 35.72 6.71 - S S - - - - - 8-5-8 28 219.08 41.67 7.72 S - S - - - - - 8-5-8 32 219.08 47.62 8.94 S SLB SLB - - - - - 8-5-8 36 219.08 53.57 10.16 - SLB SLB LB LB LB LB - 8-5-8 40 219.08 59.53 11.43 - - LB LB LB LB LB - 8-5-8 44 219.08 65.48 12.7 - - - LB LB LB LB 8-5-8 49 219.08 72.92 14.15 - - - LB LB LB LB LB Codea Outer diameter Nominal weight (with thread and coupling) b,c Wall thickness End processing type mm kg/m mm H40 J55 M65 L80 N80 C90d P110 Q125d In Lb/ft K55 C95 1, Q T95d 1 2 3 4 5 6 7 8 9 10 11 12 13 9-5-8 32.3 244.48 48.07 7.92 S - - - - - - - 9-5-8 36 244.48 53.57 8.94 S SLB SLB - - - - - 9-5-8 40 244.48 59.53 10.03 - SLB SLB LB LB LB - - 9-5-8 43.5 244.48 64.73 11.05 - - LB LB LB LB LB - 9-5-8 47 244.48 69.94 11.99 - - LB LB LB LB LB LB 9-5-8 53.5 244.48 79.62 13.84 - - - LB LB LB LB LB 9-5-8 58.4 244.48 86.91 15.11 - - - LB LB LB LB LB 10-3-4 32.75 273.05 48.74 7.09 S - - - - - - - 10-3-4 40.5 273.05 60.27 8.89 S SB SB - - - - - 10-3-4 45.5 273.05 67.71 10.16 - SB SB - - - - - 10-3-4 51 273.05 75.9 11.43 - SB SB SB SB SB SB - 10-3-4 55.5 273.05 82.59 12.57 - - SB SB SB SB SB - 10-3-4 60.7 273.05 90.33 13.84 - - - - - SB SB SB 10-3-4 65.7 273.05 97.77 15.11 - - - - - SB SB SB 11-3-4 42 298.45 62.5 8.46 S - - - - - - - 11-3-4 47 298.45 69.94 9.53 - SB SB - - - - - 11-3-4 54 298.45 80.36 11.05 - SB SB - - - - - 11-3-4 60 298.45 89.29 12.42 - SB SB SB SB SB SB SB 13-3-8 48 339.72 71.43 8.38 S - - - - - - - 13-3-8 54.5 339.72 81.1 9.65 - SB SB - - - - - 13-3-8 61 339.72 90.78 10.92 - SB SB - - - - - 13-3-8 68 339.72 101.19 12.19 - SB SB SB SB SB SB - 13-3-8 72 339.72 107.15 13.06 - - - SB SB SB SB SB 16 65 406.4 96.73 9.53 S - - - - - - - 16 75 406.4 111.61 11.13 - SB SB - - - - - 16 84 406.4 125.01 12.57 - SB SB - - - - - 18-5-8 87.5 473.08 130.21 11.05 S SB SB - - - - - 20 94 508 139.89 11.13 SL SLB SLB - - - - - 20 106.5 508 158.49 12.7 - SLB SLB - - - - - 20 133 508 197.93 16.13 - SLB - - - - - - 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. c. Martensitic chromium steel (L80 9Cr and 13Cr) differs from carbon steel in density. The shown weight of martensitic chromium steel is not an exact value. The mass correction factor 0.989 can be used. d. C90, T95 and Q125 steel grade casing should be supplied according to specification, weight and wall thickness listed in the above table or order.

API Tubing Specifications

Size Linear Mass lb/ft Outside diameter Wall thickness Type of end-finish Grade Non-upset T﹠C Ex-Upset T﹠C ln. mm ln. mm J-55 L-80 N-801, N-80Q C-90 T-95 P-110 2 3/8"

4.00

2.375

60.33

0.167

4.24

4.60

4.70

2.375

60.33

0.190

4.83

PNU

5.80

5.95

2.375

60.33

0.254

6.45

PNU

6.60

2.375

60.33

0.295

7.49

7.35

7.45

2.375

60.33

0.336

8.53

2 7/8"

6.40

6.50

2.875

73.03

0.217

5.51

PUN

PNU

7.80

7.90

2.875

73.03

0.276

7.01

PNU

8.60

8.70

2.875

73.03

0.308

7.82

PNU

9.35

9.45

2.875

73.03

0.340

8.64

10.50

2.875

73.03

0.392

9.96

11.50

2.875

73.03

0.440

11.18

3 1/2"

7.70

3.500

88.90

0.216

5.49

9.20

9.30

3.500

88.90

0.254

6.45

PNU

10.20

3.500

88.90

0.289

7.34

12.70

12.95

3.500

88.90

0.375

9.52

PNU

14.30

3.500

88.90

0.430

10.92

15.50

3.500

88.90

0.476

12.09

17.00

3.500

88.90

0.530

13.46

9.50

4.000

101.60

0.226

5.74

10.70

11.00

4.000

101.60

0.262

6.65

13.20

4.000

101.60

0.33.

8.38

16.10

4.000

101.60

0.415

10.54

18.90

4.000

101.60

0.500

12.70

22.20

4.000

101.60

0.610

15.49

4 1/2"

12.60

12.75

4.500

114.30

0.271

6.88

PNU

15.20

4.500

114.30

0.337

8.56

17.00

4.500

114.30

0.380

9.65

18.90

4.500

114.30

0.43

10.92

21.50

4.500

114.30

0.500

12.70

23.70

4.500

114.30

0.560

14.22

26.10

4.500

114.30

0.630

16.00

Non-Upset T﹠C-Non-upset threaded and coupled Ex-Upset T﹠C-External upset threaded and coupled P-Plain end N-Non-upset threaded and coupled U-External upset threaded and coupled

API 5CT K55 Casing Tubing Features

API 5CT K55 Casing Tubing is offered with a free length range from 8 to 13m on basis of the SY/T6194-96 norm. However, it is also available no less than 6m length and its quantity should be no more than 20%.
Any deformation such as crease, hairline, separation, crack or scab is not acceptable on both inner and outer surfaces of the product. All these defects should be completely removed, and the removed depth must not exceed 12.5% of nominal wall thickness
Deformations which mentioned above are not allowed to appear on the outer surface of API 5CT K55 Casing Tubing coupling
The surface of thread of coupling and API 5CT K55 Casing Tubing should be smooth without any burr, tear or other defects that may have a negative impact on the strength and close connection

API 5CT K55 Casing Tubing Packaging

In compliance with the regulation of SY/T6194-96, the domestic API 5CT K55 Casing Tubing should be strapped with steel wire or belt. The protection ring should be screwed on the exposed part of the thread of each casing pipe and its coupling to well protect the thread.

is a API 5CT Oil Casing Pipe & mainly used for oil well drilling. We manufacturein accordance with the SY/T6194-96 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-55, K-55, N-80, C-75, L-80, C-90, C-95, P-110 and Q-125. We supply the casing pipe &accompanied with thread and coupling, or we offer our product in accordance with the following forms for option. If you are interested in API 5CT K55 Casing Tubing, we will supply you with the best price based on the highest quality

Are you interested in learning more about 1000m-7000m land oil drilling rig? Contact us today to secure an expert consultation!

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