TUSPIPE-LOGO-TIANJIN-UNITED-STEEL-PIPE-CO.,-LTD

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.
K550.340.381.251.50.150.20.020.015
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 3/82.3860.340.1674.24PUPNPNPNPNPN
4.64.70.194.83PNUPNUPNUPNUPNUPNUPNU
5.85.950.2546.45PNUPNUPNUPNUPNU
6.60.2957.49PPP
7.357.450.3368.53PUPUPU
2 7/82.88736.46.50.2175.51PNUPNU
7.87.90.2767.01
8.68.70.3087.82PLBPLBPLBEPLB
9.359.450.348.64PLBPLBPLBEPLB
10.50.3929.96PLBPLBPLBPLB
11.50.4411.18PLB 
3 1/23.588.97.70.2165.49PNPNPNPNPNPN
9.29.30.2546.45PNUPNUPNUPNUPNUPNUPNU
10.20.2897.34PNPNPNPNPNPN
12.712.950.3759.52PNUPNUPNUPNUPNU
14.30.4310.92PPP
15.50.47612.09PPP
170.5313.46PPP
441029.50.2265.74PNPNPNPNPNPN
110.2626.65PUPUPUPUPUPU
13.20.338.38PPP
16.10.41510.54PPP
18.90.512.7PPP
22.20.6115.49PPP
4 1/24.511412.612.750.2716.88PNUPNUPNUPNUPNUPNU
15.20.3378.56PPP
170.389.65PPP
18.90.4310.92PPPPLB
21.50.512.7PPPPLB
23.70.5614.22PPPPLB
26.10.6316PPPPLB
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
10.515.630.2245.69PSB
11.617.260.2506.35PSLBPLBPLBPLBPLB
13.520.090.2907.37PLBPLBPLBPLB
15.122.470.3379.56PLB
55.00012711.517.110.2205.59PS
1319.350.2536.43PSLB
1522.320.2967.52PSLBPLBPLBPLBEPLB
1826.790.3629.19PLBPLBPLBEPLB
21.431.850.43711.1PLBPLBPLBPLB
23.234.530.47812.14PLB
24.135.860.50012.7PLB
5 1/25.500139.71420.830.2446.2PSPS
15.523.070.2756.98PSLB
1725.30.3047.72PSLBPLBPLBPLBEPLB
2029.760.3619.17PLBPLBPLBEPLB
2334.230.41510.54PLBPLBPLBEPLB
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
2435.720.3528.94PSLBPLBPLBPLBEPLB
2841.670.41710.59PLBPLBPLBEPLB
3247.620.47512.06PLBPLBPLBEPLB
77.000177.81725.30.2315.87PS
2029.760.2726.91PSPS
2334.230.3178.05PSLBPLBPLBPLBE
2638.690.3629.19PSLBPLBPLBPLBEPLB
2943.160.40810.36PLBPLBPLBEPLB
3247.620.45311.51PLBPLBPLBEPLB
3552.090.49812.65PLBPLBPLBEPLB
3856.550.54013.72PLBPLBPLBEPLB
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
26.439.290.3288.33PSLBPLBPLBPLBEPLB
29.744.20.3759.52PLBPLBPLBEPLB
33.750.150.43010.92PLBPLBPLBEPLB
3958.050.50012.7PLBPLBPLBEPLB
42.863.690.56214.27PLBPLBPLBPLB
45.367.410.59515.11PLBPLBPLBPLB
47.170.090.62515.88PLBPLBPLBPLB
51.276.190.68717.45
55.380.30.75019.05
8 5/88.625219.082435.720.2646.71PS
2841.620.3047.72PS
3247.620.3528.94PSPSLB
3653.570.40010.16PSLBPLBPLBPLBEPLB
4059.530.45011.43PLBPLBPLBEPLB
4465.480.50012.7PLBPLBPLBEPLB
4972.920.55714.15PLBPLBPLBEPLB
9 5/89.625244.4832.348.070.3127.92PS
3653.570.3528.94PSPSLB
4059.530.39510.03PSLBPLBPLBPLBE
43.564.730.43511.05PLBPLBPLBEPLB
4769.940.47211.99PLBPLBPLBEPLB
53.579.620.54513.84PLBPLBPLBEPLB
58.486.910.59515.11PLBPLBPLBPLB
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
15.567.710.40010.16PSB
5175.90.45011.43PSBPSBPSBPSBEPSB
55.582.590.49512.57PSBPSBPSBEPSB
60.790.330.54513.84PSBEPSB
65.797.770.59515.11PSBPSB
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
54.581.10.3809.65PSB
6190.780.43010.92PSB
68101.190.48012.19PSBPSBPSBPSBPSB
72107.150.51413.06PSBPSBPSBPSB
1616.000406.46596.730.3759.53PS
75111.610.43811.13PSB
84125.010.49512.57PSB
109162.210.65616.66PPPP
18 5/818.625473.0887.5130.210.43511.05PSPSB
2020.00050894139.890.43811.13PSLPSLB
106.5158.490.50012.7PSLB
133197.930.63516.13PSLB
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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