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

GradeTypeCMnMoCrNi max.Cu max.P max.S max.Si max.
min.max.min.max.min.max.min.max.
K55–0.340.381.251.5–––0.15–0.20.020.015–
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 StandardAPI 5CT Casing Pipe TypeAPI 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

DNO. D.WeightW. T.End Processing
Non-upset coupling-threadUpset coupling-threadSteel Grade
inmmlb./ft.lb./ft.inmmH40J55L80N80C90T95P110
2 3/82.3860.34–0.1674.24PUPNPNPNPNPN–
4.64.70.194.83PNUPNUPNUPNUPNUPNUPNU
5.85.950.2546.45––PNUPNUPNUPNUPNU
6.6–0.2957.49––P–PP–
7.357.450.3368.53––PU–PUPU–
2 7/82.88736.46.50.2175.51PNUPNU–––––
7.87.90.2767.01–––––––
8.68.70.3087.82––PLBPLBPLBE–PLB
9.359.450.348.64––PLBPLBPLBE–PLB
10.5–0.3929.96––PLBPLBPLB–PLB
11.5–0.4411.18––––PLB– 
3 1/23.588.97.7–0.2165.49PNPNPNPNPNPN–
9.29.30.2546.45PNUPNUPNUPNUPNUPNUPNU
10.2–0.2897.34PNPNPNPNPNPN–
12.712.950.3759.52––PNUPNUPNUPNUPNU
14.3–0.4310.92––P–PP–
15.5–0.47612.09––P–PP–
17–0.5313.46––P–PP–
441029.5–0.2265.74PNPNPNPNPNPN–
–110.2626.65PUPUPUPUPUPU–
13.2–0.338.38––P–PP–
16.1–0.41510.54––P–PP–
18.9–0.512.7––P–PP–
22.2–0.6115.49––P–PP–
4 1/24.511412.612.750.2716.88PNUPNUPNUPNUPNUPNU–
15.2–0.3378.56––P–PP–
17–0.389.65––P–PP–
18.9–0.4310.92––P–PPPLB
21.5–0.512.7––P–PPPLB
23.7–0.5614.22––P–PPPLB
26.1–0.6316––P–PPPLB
P——Plain;N—— Non-upset coupling-thread;U—— Upset coupling-thread; L——Integral

- Specification & Size of API 5CT K55 Casing

DNO. D.WeightW. T. End Machining Form
 Steel Grade
inmmlb/ftkg/minmmH40J55L80N80C90P110
K55T95
4 1/24.500114.39.514.140.2055.21PSPS––––
10.515.630.2245.69–PSB––––
11.617.260.2506.35–PSLBPLBPLBPLBPLB
13.520.090.2907.37––PLBPLBPLBPLB
15.122.470.3379.56–––––PLB
55.00012711.517.110.2205.59–PS––––
1319.350.2536.43–PSLB––––
1522.320.2967.52–PSLBPLBPLBPLBEPLB
1826.790.3629.19––PLBPLBPLBEPLB
21.431.850.43711.1––PLBPLBPLBPLB
23.234.530.47812.14––––PLB–
24.135.860.50012.7––––PLB–
5 1/25.500139.71420.830.2446.2PSPS––––
15.523.070.2756.98–PSLB––––
1725.30.3047.72–PSLBPLBPLBPLBEPLB
2029.760.3619.17––PLBPLBPLBEPLB
2334.230.41510.54––PLBPLBPLBEPLB
26.839.880.50012.7––––––
29.744.20.56214.27––––––
32.648.510.62515.88––––––
35.352.530.68717.45––––––
3856.550.75019.05––––––
40.560.270.81220.62––––––
43.164.140.87522.22––––––
6 5/86.625168.282029.760.2887.32PSPSLB––––
2435.720.3528.94–PSLBPLBPLBPLBEPLB
2841.670.41710.59––PLBPLBPLBEPLB
3247.620.47512.06––PLBPLBPLBEPLB
77.000177.81725.30.2315.87PS–––––
2029.760.2726.91PSPS––––
2334.230.3178.05–PSLBPLBPLBPLBE–
2638.690.3629.19–PSLBPLBPLBPLBEPLB
2943.160.40810.36––PLBPLBPLBEPLB
3247.620.45311.51––PLBPLBPLBEPLB
3552.090.49812.65––PLBPLBPLBEPLB
3856.550.54013.72––PLBPLBPLBEPLB
42.763.540.62515.88––––––
46.469.050.68717.45––––––
50.174.560.75019.05––––––
53.679.770.81220.62––––––
57.184.970.87522.22––––––
7 5/87.625193.682435.720.3007.62PS–––––
26.439.290.3288.33–PSLBPLBPLBPLBEPLB
29.744.20.3759.52––PLBPLBPLBEPLB
33.750.150.43010.92––PLBPLBPLBEPLB
3958.050.50012.7––PLBPLBPLBEPLB
42.863.690.56214.27––PLBPLBPLBPLB
45.367.410.59515.11––PLBPLBPLBPLB
47.170.090.62515.88––PLBPLBPLBPLB
51.276.190.68717.45––––––
55.380.30.75019.05––––––
8 5/88.625219.082435.720.2646.71–PS––––
2841.620.3047.72PS–––––
3247.620.3528.94PSPSLB––––
3653.570.40010.16–PSLBPLBPLBPLBEPLB
4059.530.45011.43––PLBPLBPLBEPLB
4465.480.50012.7––PLBPLBPLBEPLB
4972.920.55714.15––PLBPLBPLBEPLB
9 5/89.625244.4832.348.070.3127.92PS–––––
3653.570.3528.94PSPSLB––––
4059.530.39510.03–PSLBPLBPLBPLBE–
43.564.730.43511.05––PLBPLBPLBEPLB
4769.940.47211.99––PLBPLBPLBEPLB
53.579.620.54513.84––PLBPLBPLBEPLB
58.486.910.59515.11––PLBPLBPLBPLB
59.488.40.60915.47––––––
64.996.580.67217.07––––––
70.3104.620.73418.64––––––
75.6112.50.79720.24––––––
10 3/410.750273.0532.7548.740.2797.09PS–––––
40.560.270.3508.89PSPSB––––
15.567.710.40010.16–PSB––––
5175.90.45011.43–PSBPSBPSBPSBEPSB
55.582.590.49512.57––PSBPSBPSBEPSB
60.790.330.54513.84––––PSBEPSB
65.797.770.59515.11––––PSBPSB
73.2108.930.67217.07––––––
79.2117.860.73418.64––––––
85.3126.940.79720.24––––––
11 3/411.750 4262.50.3338.46PS–––––
4769.940.37520.24––––––
5480.360.4358.46––––––
6089.290.4899.53––––––
6596.730.53411.05––––––
71105.660.58214.42––––––
13 3/813.375339.734871.430.3308.38PS–––––
54.581.10.3809.65–PSB––––
6190.780.43010.92–PSB––––
68101.190.48012.19–PSBPSBPSBPSBPSB
72107.150.51413.06––PSBPSBPSBPSB
1616.000406.46596.730.3759.53PS–––––
75111.610.43811.13–PSB––––
84125.010.49512.57–PSB––––
109162.210.65616.66–PPP–P
18 5/818.625473.0887.5130.210.43511.05PSPSB––––
2020.00050894139.890.43811.13PSLPSLB––––
106.5158.490.50012.7–PSLB––––
133197.930.63516.13–PSLB––––
P——Plain;S——Short-thread;L——Long-thread;B——Buttress thread;E——Extreme thread

API 5CT K55 Tolerance

ItemAllowable Tolerance
Outer diameterPipe bodyD≤101.60mm±0.79mm
D≥114.30mm+1.0%
-0.50%
Line-Pipe-from-Tianjin-United-Steel-Pipe
Line Pipe
Slotted-Liner
Slotted Liner
Pipe-Fabrication-Spooling
Steel Fabrication
pipe-fittings
Pipe Fittings
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