API 5CT K55

API-5CT-H40-API-5CT-K55-OCTG-TUBING-CASING-TUSPIPE

API 5CT K55

API 5CT K55 is a pipe grade specified by the American Petroleum Institute. API 5CT K55 is a type of well casing that is typically used in well drilling operations. The casing and tubing are OCTG (oil country tubular goods) that are used to form the walls of the well. The steel pipe is placed in the well and held in place by cement. The cement helps to protect the well from collapse and keeps the well fluids from escaping. API 5CT K55 is a popular choice for well drilling because it is durable and can withstand high temperatures and pressures.

Why choose tuspipe?

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Since 1998, Tianjin United Steel Pipe Co., Ltd (TUSPIPE) has been committed to supplying high-quality line pipes.

With over 500,000 tons annual production capacity, the company serves various fields and industries, such as oil & gas exploitation and transmission, ship & auto-building, water & electricity, environmental protection, mechanical engineering, infrastructure construction and etc.

TUSPIPE places a premium on product quality and rigorous product quality control. In order to maintain good product quality,  the company has established a Test & Inspection Center since 2004. With a series of state-of-the-art tests and inspection equipment, the test & inspection center is able to perform the tensile tests, hydro tests, impact tests, DWTT, etc.

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Chemical Composition of API 5CT K55

Grade Type C Mn Mo Cr Ni max. Cu max. P max. S max. Si max.
min. max. min. max. min. max. min. max.
K55 0.34 0.38 1.25 1.5 0.15 0.2 0.02 0.015
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. f) NL = no limit. Elements shown shall be reported in product analysis.

Mechanical Analysis of API 5CT K55

API 5CT Casing Pipe Standard API 5CT Casing Pipe Type API 5CT Casing Pipe Tensile Strength MPa API 5CT Casing Pipe Yield Strength MPa API 5CT Casing Pipe Hardness Max.
API SPEC 5CT ≥517 ≥655

API Casing/ API 5CT K55 Casing Tubing Specifications

- Specification & Size of API 5CT K55 Tubing

DN O. D. Weight W. T. End Processing
Non-upset coupling-thread Upset coupling-thread Steel Grade
in mm lb./ft. lb./ft. in mm H40 J55 L80 N80 C90 T95 P110
2 3/8 2.38 60.3 4 0.167 4.24 PU PN PN PN PN PN
4.6 4.7 0.19 4.83 PNU PNU PNU PNU PNU PNU PNU
5.8 5.95 0.254 6.45 PNU PNU PNU PNU PNU
6.6 0.295 7.49 P P P
7.35 7.45 0.336 8.53 PU PU PU
2 7/8 2.88 73 6.4 6.5 0.217 5.51 PNU PNU
7.8 7.9 0.276 7.01
8.6 8.7 0.308 7.82 PLB PLB PLBE PLB
9.35 9.45 0.34 8.64 PLB PLB PLBE PLB
10.5 0.392 9.96 PLB PLB PLB PLB
11.5 0.44 11.18 PLB
3 1/2 3.5 88.9 7.7 0.216 5.49 PN PN PN PN PN PN
9.2 9.3 0.254 6.45 PNU PNU PNU PNU PNU PNU PNU
10.2 0.289 7.34 PN PN PN PN PN PN
12.7 12.95 0.375 9.52 PNU PNU PNU PNU PNU
14.3 0.43 10.92 P P P
15.5 0.476 12.09 P P P
17 0.53 13.46 P P P
4 4 102 9.5 0.226 5.74 PN PN PN PN PN PN
11 0.262 6.65 PU PU PU PU PU PU
13.2 0.33 8.38 P P P
16.1 0.415 10.54 P P P
18.9 0.5 12.7 P P P
22.2 0.61 15.49 P P P
4 1/2 4.5 114 12.6 12.75 0.271 6.88 PNU PNU PNU PNU PNU PNU
15.2 0.337 8.56 P P P
17 0.38 9.65 P P P
18.9 0.43 10.92 P P P PLB
21.5 0.5 12.7 P P P PLB
23.7 0.56 14.22 P P P PLB
26.1 0.63 16 P P P PLB
P——Plain;N—— Non-upset coupling-thread;U—— Upset coupling-thread; L——Integral

- Specification & Size of API 5CT K55 Casing

DN O. D. Weight W. T.   End Machining Form
  Steel Grade
in mm lb/ft kg/m in mm H40 J55 L80 N80 C90 P110
K55 T95
4 1/2 4.500 114.3 9.5 14.14 0.205 5.21 PS PS
10.5 15.63 0.224 5.69 PSB
11.6 17.26 0.250 6.35 PSLB PLB PLB PLB PLB
13.5 20.09 0.290 7.37 PLB PLB PLB PLB
15.1 22.47 0.337 9.56 PLB
5 5.000 127 11.5 17.11 0.220 5.59 PS
13 19.35 0.253 6.43 PSLB
15 22.32 0.296 7.52 PSLB PLB PLB PLBE PLB
18 26.79 0.362 9.19 PLB PLB PLBE PLB
21.4 31.85 0.437 11.1 PLB PLB PLB PLB
23.2 34.53 0.478 12.14 PLB
24.1 35.86 0.500 12.7 PLB
5 1/2 5.500 139.7 14 20.83 0.244 6.2 PS PS
15.5 23.07 0.275 6.98 PSLB
17 25.3 0.304 7.72 PSLB PLB PLB PLBE PLB
20 29.76 0.361 9.17 PLB PLB PLBE PLB
23 34.23 0.415 10.54 PLB PLB PLBE PLB
26.8 39.88 0.500 12.7
29.7 44.2 0.562 14.27
32.6 48.51 0.625 15.88
35.3 52.53 0.687 17.45
38 56.55 0.750 19.05
40.5 60.27 0.812 20.62
43.1 64.14 0.875 22.22
6 5/8 6.625 168.28 20 29.76 0.288 7.32 PS PSLB
24 35.72 0.352 8.94 PSLB PLB PLB PLBE PLB
28 41.67 0.417 10.59 PLB PLB PLBE PLB
32 47.62 0.475 12.06 PLB PLB PLBE PLB
7 7.000 177.8 17 25.3 0.231 5.87 PS
20 29.76 0.272 6.91 PS PS
23 34.23 0.317 8.05 PSLB PLB PLB PLBE
26 38.69 0.362 9.19 PSLB PLB PLB PLBE PLB
29 43.16 0.408 10.36 PLB PLB PLBE PLB
32 47.62 0.453 11.51 PLB PLB PLBE PLB
35 52.09 0.498 12.65 PLB PLB PLBE PLB
38 56.55 0.540 13.72 PLB PLB PLBE PLB
42.7 63.54 0.625 15.88
46.4 69.05 0.687 17.45
50.1 74.56 0.750 19.05
53.6 79.77 0.812 20.62
57.1 84.97 0.875 22.22
7 5/8 7.625 193.68 24 35.72 0.300 7.62 PS
26.4 39.29 0.328 8.33 PSLB PLB PLB PLBE PLB
29.7 44.2 0.375 9.52 PLB PLB PLBE PLB
33.7 50.15 0.430 10.92 PLB PLB PLBE PLB
39 58.05 0.500 12.7 PLB PLB PLBE PLB
42.8 63.69 0.562 14.27 PLB PLB PLB PLB
45.3 67.41 0.595 15.11 PLB PLB PLB PLB
47.1 70.09 0.625 15.88 PLB PLB PLB PLB
51.2 76.19 0.687 17.45
55.3 80.3 0.750 19.05
8 5/8 8.625 219.08 24 35.72 0.264 6.71 PS
28 41.62 0.304 7.72 PS
32 47.62 0.352 8.94 PS PSLB
36 53.57 0.400 10.16 PSLB PLB PLB PLBE PLB
40 59.53 0.450 11.43 PLB PLB PLBE PLB
44 65.48 0.500 12.7 PLB PLB PLBE PLB
49 72.92 0.557 14.15 PLB PLB PLBE PLB
9 5/8 9.625 244.48 32.3 48.07 0.312 7.92 PS
36 53.57 0.352 8.94 PS PSLB
40 59.53 0.395 10.03 PSLB PLB PLB PLBE
43.5 64.73 0.435 11.05 PLB PLB PLBE PLB
47 69.94 0.472 11.99 PLB PLB PLBE PLB
53.5 79.62 0.545 13.84 PLB PLB PLBE PLB
58.4 86.91 0.595 15.11 PLB PLB PLB PLB
59.4 88.4 0.609 15.47
64.9 96.58 0.672 17.07
70.3 104.62 0.734 18.64
75.6 112.5 0.797 20.24
10 3/4 10.750 273.05 32.75 48.74 0.279 7.09 PS
40.5 60.27 0.350 8.89 PS PSB
15.5 67.71 0.400 10.16 PSB
51 75.9 0.450 11.43 PSB PSB PSB PSBE PSB
55.5 82.59 0.495 12.57 PSB PSB PSBE PSB
60.7 90.33 0.545 13.84 PSBE PSB
65.7 97.77 0.595 15.11 PSB PSB
73.2 108.93 0.672 17.07
79.2 117.86 0.734 18.64
85.3 126.94 0.797 20.24
11 3/4 11.750 42 62.5 0.333 8.46 PS
47 69.94 0.375 20.24
54 80.36 0.435 8.46
60 89.29 0.489 9.53
65 96.73 0.534 11.05
71 105.66 0.582 14.42
13 3/8 13.375 339.73 48 71.43 0.330 8.38 PS
54.5 81.1 0.380 9.65 PSB
61 90.78 0.430 10.92 PSB
68 101.19 0.480 12.19 PSB PSB PSB PSB PSB
72 107.15 0.514 13.06 PSB PSB PSB PSB
16 16.000 406.4 65 96.73 0.375 9.53 PS
75 111.61 0.438 11.13 PSB
84 125.01 0.495 12.57 PSB
109 162.21 0.656 16.66 P P P P
18 5/8 18.625 473.08 87.5 130.21 0.435 11.05 PS PSB
20 20.000 508 94 139.89 0.438 11.13 PSL PSLB
106.5 158.49 0.500 12.7 PSLB
133 197.93 0.635 16.13 PSLB
P——Plain;S——Short-thread;L——Long-thread;B——Buttress thread;E——Extreme thread

API 5CT K55 Tolerance

Item Allowable Tolerance
Outer diameter Pipe body D≤101.60mm±0.79mm
D≥114.30mm+1.0%
-0.50%
Line-Pipe
Line Pipe
Slotted-Liner
Slotted Liner
Pipe-Fabrication-Spooling
Steel Fabrication
pipe-fittings
Pipe Fittings
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