API 5CT K55 CASING

Product Introduction

API 5CT K55 casing pipe is a type of casing pipe used in oil and gas exploration and production. It is made of steel and has a yield strength of 379 MPa (55,000 psi) and a minimum tensile strength of 655 MPa (95,000 psi).Class K55 tubing is also referred to as general purpose tubing and is typically used for shallow to medium depth wells. It has high corrosion resistance and is suitable for sour gas service. The chemical composition of API 5CT K55 tubing typically consists of carbon, manganese, silicon, phosphorus, sulphur, chromium, nickel and copper.

Pipe Process of API 5CT K55 Casing
Round Pipe → pipe inspection → NDT inspection MPI → End Threading → Thread Inspection → Coupling Threading lnspection → NDT inspection MPI ( coupling) → Phosphating (for coupling) → Coupling power Make up → Hydrostatic test → Drift test → Doping and Protectors Application → Coating → Measurement of Length and Weight → Colour Identification → Marking → Packing → Warehousing

API 5CT K55 CASING TUBING SPECIFICATIONS
API 5CT K55 Casing Tubing Available Sizes	2 3/8″, 2 7/8″ and 3 ½” Outer Diameter
API 5CT K55 Casing Tubing Grades	J55, J55-FBNAU, N80, L80, P110
API 5CT K55 Casing Tubing	1 1/4 “ – 2 1/16” Nom.
API 5CT K55 Casing Tubing Standards	API SPEC 5CT
K55 API 5CT Casing Tubing Model in Common Use	2-3/8", 2-7/8", 3-1/2", 4", 4-1/2"
API 5CT K55 Casing Tubing Length Range	R1(6.10-7.32m), R2(8.53-9.75m), R3(11.58-12.8m)
API 5CT K55 Casing Tubing Steel Grade (Casing Grades, Tubing Grades)	J55, K55, N80-1, N80-Q, L80, P110
K55 API 5CT Casing Tubing Type of Screw Thread	Non upset threaded end(NUE), External upset threaded end(EUE)
API 5CT K55 Casing Tubing Specialties	Drifting (Full-length, or just ends) Threading Heat treating External upset Hydrostatic Testing Couplings – EUE, AB Modified, turned down, special clearance couplings Coating to customer specifications Full third-party inspection capabilities (EMI, SEA, and Weld Line) Pup Joints

Technical data

API 5CT K55 Casing Tubing Chemical Composition

Group	Grade	Type	C		Mn		Mo		Cr		Ni max.	Cu max.	P max.	S max.	Si max.
Group	Grade	Type	min.	max.	min.	max.	min.	max.	min.	max.	Ni max.	Cu max.	P max.	S max.	Si max.
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
1	H40	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	J55	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	K55	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	N80	1	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	N80	Q	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	R95	-	-	0.45 c	-	1.9	-	-	-	-	-	-	0.03	0.03	0.45
2	M65	-	-	-	-	-	-	-	-	-	-	-	0.03	0.03	-
	L80	1	-	0.43 a	-	1.9	-	-	-	-	0.25	0.35	0.03	0.03	0.45
	L80	9Cr	-	0.15	0.3	0.6	0.9	1.1	8	10	0.5	0.25	0.02	0.01	1
	L80	13Cr	0.15	0.22	0.25	1	-	-	12	14	0.5	0.25	0.02	0.01	1
	C90	1	-	0.35	-	1.2	0.25 b	0.85	-	1.5	0.99	-	0.02	0.01	-
	T95	1	-	0.35	-	1.2	0.25 d	0.85	0.4	1.5	0.99	-	0.02	0.01	-
	C110	-	-	0.35	-	1.2	0.25	1	0.4	1.5	0.99	-	0.02	0.005	-
3	P110	e	-	-	-	-	-	-	-	-	-	-	0.030 e	0.030 e	-
4	Q125	1	-	0.35		1.35	-	0.85	-	1.5	0.99	-	0.02	0.01	-
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. NL = no limit. Elements shown shall be reported in product analysis.

API 5CT Gr. k55 Casing Mechanical Properties

Standard	Type	Tensile Strength MPa	Yield Strength MPa	Hardness Max.
API SPEC 5CT	API 5Ct Casing J55	≥517	379 ~ 552	----
	API 5Ct Casing K55	≥517	≥655	---
	API 5Ct Casing N80	≥689	552 ~ 758	---
	API 5Ct Casing L80(13Cr)	≥655	552 ~ 655	≤241HB
	API 5Ct Casing P110	≥862	758 ~ 965	----

API 5CT K55 Casing Tubing Tensile & Hardness Requirement

Group	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
Group	Grade	Type	Total elongation under load %	min.	max .		HRC	HBW	Specified wall thickness mm	Allowable hardness variation b HRC
1	2	3	4	5	6	7	8	9	10	11
1	H40	-	0.5	276	552	414	-	-	-	-
	J55	-	0.5	379	552	517	-	-	-	-
	K55	-	0.5	379	552	655	-	-	-	-
	N80	1	0.5	552	758	689	-	-	-	-
	N80	Q	0.5	552	758	689	-	-	-	-
	R95	-	0.5	655	758	724	-	-	-	-
2	M65	-	0.5	448	586	586	22	235	-	-
	L80	1	0.5	552	655	655	23	241	-	-
	L80	9Cr	0.5	552	655	655	23	241	-	-
	L80	13Cr	0.5	552	655	655	23	241	-	-
	C90	1	0.5	621	724	689	25.4	255	≤ 12.70 12.71 to 19.04 19.05 to 25.39 ≥ 25.40	3.0 4.0 5.0 6.0
	T95	1	0.5	655	758	724	25.4	255	≤ 12.70 12.71 to 19.04 19.05 to 25.39 ≥ 25.40	3.0 4.0 5.0 6.0
	C110	-	0.7	758	828	793	30	286	≤ 12.70 12.71 to 19.04 19.05 to 25.39. ≥ 25.40	3.0 4.0 5.0 6.0
3	P110	-	0.6	758	965	862	-	-	-	-
4	Q125	1	0.65	862	1034	931	b	-	≤ 12.70 12.71 to 19.04 ≥ 19.05	3.0 4.0 5.0
aIn case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method. bNo hardness limits are specified, but the maximum variation is restricted in accordance with 7.8 and 7.9 of API Spec. 5CT.

API 5CT K55 Casing Tubing Features

API 5CT K55 Casing Tubing is offered with a free length range from 8m to 13m on basis of the SY/T6194-96 norm. However, it is also available no less than 6m length and its quantity should be no more than 20%.
Deformations which mentioned above are not allowed to appear on the outer surface of API 5CT K55 Casing Tubing coupling.
Any deformation such as hairline, separation, crease, crack or scab is not acceptable on both inner and outer surfaces of the product. All these defects should be completely removed and the removed depth must not exceed 12.5% of nominal wall thickness.
The surface of thread of coupling and API 5CT K55 Casing Tubing should be smooth without any burr, tear or other defects that may have a negative impact on the strength and close connection.