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API 5CT K55 casing tube
API 5CT K55 casing tube
API 5CT K55 casing tube
API 5CT K55 casing tube

API 5CT K55 seamless steel casing tube

API 5CT is standard technical specifications for steel casing and tubing pipes used for oil wells in petroleum and natural gas industries.In the oil boring, K55 API 5CT packaging or tubing is a generally regular sort.
Product introduction
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.

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.


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)

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)


End Finishing External Upset Ends (EUE), Flush Joint, PH6 (and equivalent connections),
Integral Joint (IJ)


Technical data

 Chemical Composition

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 - - - - - - - - - - - 0.03 0.03 -

Mechanical Properties

API 5CT Casing
Type API 5CT Casing
Tensile Strength
API 5CT Casing
Yield Strength
API 5CT Casing
API SPEC 5CT K55 ≥517 ≥655 ---

Tensile & Hardness Requirement

Grade Type Total elongation
under load %
Yield strength
Tensile strength
min. MPa
Hardness a max. Specified wall
thickness mm
Allowable hardness
variation b HRC
min. max .   HRC HBW
K55 - 0.5 379 552 655 - - - -

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.
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