API 5CT SMLS CASING PIPE K55-N80
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, welcome everyone to cantact us,E-mail:sales@ytdrgg.com,and Remote factory inspection or factory visit  

API 5CT K55 Casing Tubing Specfications

API 5CT K55 CASING TUBING SPECIFICATIONS
Available Sizes 2 3/8″, 2 7/8″ and 3 ½” Outer Diameter
Grades J55, J55-FBNAU, N80, L80, P110
Tubing 1 1/4 “ – 2 1/16” Nom.
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
  • Coating to customer specifications
  • External upset
  • Couplings – EUE, AB Modified, turned down, special clearance couplings
  • Pup Joints
  • Heat treating
  • Hydrostatic Testing
  • Drifting (Full-length, or just ends)
  • Full third-party inspection capabilities (EMI, SEA, and Weld Line)
  • Threading
End Finishing External Upset Ends (EUE), Flush Joint, PH6 (and equivalent connections), Integral Joint (IJ)
 

API 5CT K55 Casing Tubing Tensile & Hardness Requirement

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
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 in accordance with 7.8 and 7.9 of API Spec. 5CT.
 

K55 Casing Tubing Dimensions

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.
Oil Tube For Petroleum And Natural Gas Industries
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 Features

  • API 5CT K55 Casing Tubing is offered with a free length range from 8m 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%.
  • Deformations which mentioned above are not allowed to appear on the outer surface of API 5CT K55 Casing Tubing coupling.
  • Any deformation such as hairline, separation, crease, 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.
  • 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.
  It's important for oil and gas operators to protect their production well casings from corrosion with cathodic protection & API 5CT OilField Tubing primarily serves to transfer oil and gases.  

API 5CT Grade 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 -
4-1-2 13.5 114.3 20.09 7.37 - - 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 -
5 18 127 26.79 9.19 - - LB - LB - - LB
5 21.4 127 31.85 11.1 - - LB - LB - - LB
5 23.2 127 34.53 12.14 - - - LB - - - LB
5 24.1 127 35.86 12.7 - - - 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 - -
5-1-2 20 139.7 29.76 9.17 - - LB - LB - - -
5-1-2 23 139.7 34.23 10.54 - - - 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 - -
6-5-8 28 168.28 41.67 10.59 - - - - LB - LB -
6-5-8 32 168.28 47.62 12.06 - - - 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 - -
7 26 177.8 38.69 9.19 - SLB LB LB -
7 29 177.8 43.16 10.36 - - LB LB -
7 32 177.8 47.62 11.51 - - LB LB LB -
7 35 177.8 52.09 12.65 - - - 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 LB LB -
7-5-8 29.7 193.68 44.2 9.52 - - LB LB -
7-5-8 33.7 193.68 50.15 10.92 - - LB LB -
7-5-8 39 193.68 58.04 12.7 - - - LB LB
7-5-8 42.8 193.68 63.69 14.27 - - - LB LB LB
7-5-8 45.3 193.68 67.41 15.11 - - - LB LB LB
7-5-8 47.1 193.68 70.09 15.88 - - - 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 -
8-5-8 40 219.08 59.53 11.43 - - LB LB -
8-5-8 44 219.08 65.48 12.7 - - - LB LB
8-5-8 49 219.08 72.92 14.15 - - - LB LB LB
 
API 5CT Casing pipe Codea API 5CT Casing pipe Outer diameter API 5CT Casing pipe Nominal weight (with thread and coupling) b,c API 5CT Casing pipe Wall thickness API 5CT Casing pipe 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 5CT K55 Chemical Composition

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
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 k55 Gr. Mechanical Properties

API 5CT Casing Standard Type API 5CT Casing Tensile Strength MPa API 5CT Casing Yield Strength MPa API 5CT Casing 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 ----

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