Tianjin Bohai Metal Corporation

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.

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Commodity name: API 5CT K55 seamless steel casing tube

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.

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)

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 Standard	Type	API 5CT Casing Tensile Strength MPa	API 5CT Casing Yield Strength MPa	API 5CT Casing Hardness Max.
API SPEC 5CT	K55	≥517	≥655	---

Tensile & Hardness Requirement

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
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.