API 5CT -API 5CT Casing aNd Tubing chart(P110/ J55/ K55/ N80)

TUSPIPE’s API 5CT casing and tubing are certified to the API 5CT standard. The chemical composition, mechanical properties, and dimensional tolerances of the tubing all meet the certification requirements. Detailed dimensions of the API 5CT casing and tubing are shown below.

API 5CT (Casing and Tubing)

The API 5CT standard covers OCTG fittings/threads and material links. Dimensions, coatings, processes, wall thicknesses and testing for different materials and steel grades are also covered.

API 5CT standard pipelines are essential for both onshore and offshore operations in the oil and gas industry.TUSPIPE is a professional steel pipe manufacturer, we have API 5CT standard certification, produce pipelines in strict compliance with the standard, provide test documents, and support tripartite inspection. Please contact us for any requirements!

API 5CT STEEL PIPE GRADE

The classification of steel grades in API 5CT is divided into several grades mainly based on pressure resistance, corrosion resistance and heat resistance. Below are some common steel grades in API 5CT, TUSPIPE specializes in manufacturing steel pipe, you can browse it with confidence and consult us if you have any questions!

Below you will find API 5CT Specifications, API 5CT Chart, API 5CT Wall Thicknesses, API 5CT Piping Standards, API 5CT Casing, API 5CT tubing, and for your convenience we have divided the piping standards into four categories:

Group 1: All casing and tubing in Grades with H, J, K, N and R
Group 2: All casing and tubing in Grades with C, L, M and T
Group 3: All casing and tubing in Grade P
Group 4: All casing in Grade Q

Dimensions and Sizes of API 5CT - api Casing and Tubing size chart

-API Tubing Chart --Specification & Size

DN	O. D.		Weight		W. T.		End Processing
	O. D.		Non-upset coupling-thread	Upset coupling-thread	W. T.		Steel Grade
	Inch	mm	lb./ft.	lb./ft.	Inch	mm	H40	J55	L80	N80	C90	T95	P110
2 3/8	2.375	60.32	4	–	0.167	4.24	PU	PN	PN	PN	PN	PN	–
			4.6	4.7	0.19	4.83	PNU	PNU	PNU	PNU	PNU	PNU	PNU
			5.8	5.95	0.254	6.45	–	–	PNU	PNU	PNU	PNU	PNU
			6.6	–	0.295	7.49	–	–	P	–	P	P	–
			7.35	7.45	0.336	8.53	–	–	PU	–	PU	PU	–
2 7/8	2.875	73.02	6.4	6.5	0.217	5.51	PNU	PNU	–	–	–	–	–
			7.8	7.9	0.276	7.01	–	–	–	–	–	–	–
			8.6	8.7	0.308	7.82	–	–	PLB	PLB	PLBE	–	PLB
			9.35	9.45	0.34	8.64	–	–	PLB	PLB	PLBE	–	PLB
			10.5	–	0.392	9.96	–	–	PLB	PLB	PLB	–	PLB
			11.5	–	0.44	11.18	–	–	–	–	PLB	–
3 1/2	3.5	88.9	7.7	–	0.216	5.49	PN	PN	PN	PN	PN	PN	–
			9.2	9.3	0.254	6.45	PNU	PNU	PNU	PNU	PNU	PNU	PNU
			10.2	–	0.289	7.34	PN	PN	PN	PN	PN	PN	–
			12.7	12.95	0.375	9.52	–	–	PNU	PNU	PNU	PNU	PNU
			14.3	–	0.43	10.92	–	–	P	–	P	P	–
			15.5	–	0.476	12.09	–	–	P	–	P	P	–
			17	–	0.53	13.46	–	–	P	–	P	P	–
4	4	101.6	9.5	–	0.226	5.74	PN	PN	PN	PN	PN	PN	–
			–	11	0.262	6.65	PU	PU	PU	PU	PU	PU	–
			13.2	–	0.33	8.38	–	–	P	–	P	P	–
			16.1	–	0.415	10.54	–	–	P	–	P	P	–
			18.9	–	0.5	12.7	–	–	P	–	P	P	–
			22.2	–	0.61	15.49	–	–	P	–	P	P	–
4 1/2	4.5	114.3	12.6	12.75	0.271	6.88	PNU	PNU	PNU	PNU	PNU	PNU	–
			15.2	–	0.337	8.56	–	–	P	–	P	P	–
			17	–	0.38	9.65	–	–	P	–	P	P	–
			18.9	–	0.43	10.92	–	–	P	–	P	P	PLB
			21.5	–	0.5	12.7	–	–	P	–	P	P	PLB
			23.7	–	0.56	14.22	–	–	P	–	P	P	PLB
			26.1	–	0.63	16	–	–	P	–	P	P	PLB
P——Plain；N—— Non-upset coupling-thread；U—— Upset coupling-thread； L——Integral

-API Casing Table--Specification & Size

DN	O. D.		Weight		W. T.			End Machining Form
	O. D.		Weight		W. T.			Steel Grade
	Inch	mm	lb/ft	kg/m	Inch	mm	H40	J55	L80	N80	C90	P110
	Inch	mm	lb/ft	kg/m	Inch	mm	H40	K55	L80	N80	T95	P110
4 1/2	4.5	114.3	9.5	14.14	0.205	5.21	PS	PS	–	–	–	–
			10.5	15.63	0.224	5.69	–	PSB	–	–	–	–
			11.6	17.26	0.25	6.35	–	PSLB	PLB	PLB	PLB	PLB
			13.5	20.09	0.29	7.37	–	–	PLB	PLB	PLB	PLB
			15.1	22.47	0.337	9.56	–	–	–	–	–	PLB
5	5	127	11.5	17.11	0.22	5.59	–	PS	–	–	–	–
			13	19.35	0.253	6.43	–	PSLB	–	–	–	–
			15	22.32	0.296	7.52	–	PSLB	PLB	PLB	PLBE	PLB
			18	26.79	0.362	9.19	–	–	PLB	PLB	PLBE	PLB
			21.4	31.85	0.437	11.1	–	–	PLB	PLB	PLB	PLB
			23.2	34.53	0.478	12.14	–	–	–	–	PLB	–
			24.1	35.86	0.5	12.7	–	–	–	–	PLB	–
5 1/2	5.5	139.7	14	20.83	0.244	6.2	PS	PS	–	–	–	–
			15.5	23.07	0.275	6.98	–	PSLB	–	–	–	–
			17	25.3	0.304	7.72	–	PSLB	PLB	PLB	PLBE	PLB
			20	29.76	0.361	9.17	–	–	PLB	PLB	PLBE	PLB
			23	34.23	0.415	10.54	–	–	PLB	PLB	PLBE	PLB
			26.8	39.88	0.5	12.7	–	–	–	–	–	–
			29.7	44.2	0.562	14.27	–	–	–	–	–	–
			32.6	48.51	0.625	15.88	–	–	–	–	–	–
			35.3	52.53	0.687	17.45	–	–	–	–	–	–
			38	56.55	0.75	19.05	–	–	–	–	–	–
			40.5	60.27	0.812	20.62	–	–	–	–	–	–
			43.1	64.14	0.875	22.22	–	–	–	–	–	–
6 5/8	6.625	168.28	20	29.76	0.288	7.32	PS	PSLB	–	–	–	–
			24	35.72	0.352	8.94	–	PSLB	PLB	PLB	PLBE	PLB
			28	41.67	0.417	10.59	–	–	PLB	PLB	PLBE	PLB
			32	47.62	0.475	12.06	–	–	PLB	PLB	PLBE	PLB
7	7	177.8	17	25.3	0.231	5.87	PS	–	–	–	–	–
			20	29.76	0.272	6.91	PS	PS	–	–	–	–
			23	34.23	0.317	8.05	–	PSLB	PLB	PLB	PLBE	–
			26	38.69	0.362	9.19	–	PSLB	PLB	PLB	PLBE	PLB
			29	43.16	0.408	10.36	–	–	PLB	PLB	PLBE	PLB
			32	47.62	0.453	11.51	–	–	PLB	PLB	PLBE	PLB
			35	52.09	0.498	12.65	–	–	PLB	PLB	PLBE	PLB
			38	56.55	0.54	13.72	–	–	PLB	PLB	PLBE	PLB
			42.7	63.54	0.625	15.88	–	–	–	–	–	–
			46.4	69.05	0.687	17.45	–	–	–	–	–	–
			50.1	74.56	0.75	19.05	–	–	–	–	–	–
			53.6	79.77	0.812	20.62	–	–	–	–	–	–
			57.1	84.97	0.875	22.22	–	–	–	–	–	–
7 5/8	7.625	193.68	24	35.72	0.3	7.62	PS	–	–	–	–	–
			26.4	39.29	0.328	8.33	–	PSLB	PLB	PLB	PLBE	PLB
			29.7	44.2	0.375	9.52	–	–	PLB	PLB	PLBE	PLB
			33.7	50.15	0.43	10.92	–	–	PLB	PLB	PLBE	PLB
			39	58.05	0.5	12.7	–	–	PLB	PLB	PLBE	PLB
			42.8	63.69	0.562	14.27	–	–	PLB	PLB	PLB	PLB
			45.3	67.41	0.595	15.11	–	–	PLB	PLB	PLB	PLB
			47.1	70.09	0.625	15.88	–	–	PLB	PLB	PLB	PLB
			51.2	76.19	0.687	17.45	–	–	–	–	–	–
			55.3	80.3	0.75	19.05	–	–	–	–	–	–
8 5/8	8.625	219.08	24	35.72	0.264	6.71	–	PS	–	–	–	–
			28	41.62	0.304	7.72	PS	–	–	–	–	–
			32	47.62	0.352	8.94	PS	PSLB	–	–	–	–
			36	53.57	0.4	10.16	–	PSLB	PLB	PLB	PLBE	PLB
			40	59.53	0.45	11.43	–	–	PLB	PLB	PLBE	PLB
			44	65.48	0.5	12.7	–	–	PLB	PLB	PLBE	PLB
			49	72.92	0.557	14.15	–	–	PLB	PLB	PLBE	PLB
9 5/8	9.625	244.48	32.3	48.07	0.312	7.92	PS	–	–	–	–	–
			36	53.57	0.352	8.94	PS	PSLB	–	–	–	–
			40	59.53	0.395	10.03	–	PSLB	PLB	PLB	PLBE	–
			43.5	64.73	0.435	11.05	–	–	PLB	PLB	PLBE	PLB
			47	69.94	0.472	11.99	–	–	PLB	PLB	PLBE	PLB
			53.5	79.62	0.545	13.84	–	–	PLB	PLB	PLBE	PLB
			58.4	86.91	0.595	15.11	–	–	PLB	PLB	PLB	PLB
			59.4	88.4	0.609	15.47	–	–	–	–	–	–
			64.9	96.58	0.672	17.07	–	–	–	–	–	–
			70.3	104.62	0.734	18.64	–	–	–	–	–	–
			75.6	112.5	0.797	20.24	–	–	–	–	–	–
10 3/4	10.75	273.05	32.75	48.74	0.279	7.09	PS	–	–	–	–	–
			40.5	60.27	0.35	8.89	PS	PSB	–	–	–	–
			15.5	67.71	0.4	10.16	–	PSB	–	–	–	–
			51	75.9	0.45	11.43	–	PSB	PSB	PSB	PSBE	PSB
			55.5	82.59	0.495	12.57	–	–	PSB	PSB	PSBE	PSB
			60.7	90.33	0.545	13.84	–	–	–	–	PSBE	PSB
			65.7	97.77	0.595	15.11	–	–	–	–	PSB	PSB
			73.2	108.93	0.672	17.07	–	–	–	–	–	–
			79.2	117.86	0.734	18.64	–	–	–	–	–	–
			85.3	126.94	0.797	20.24	–	–	–	–	–	–
11 3/4	11.75	298.45	42	62.5	0.333	8.46	PS	–	–	–	–	–
			47	69.94	0.375	20.24	–	–	–	–	–	–
			54	80.36	0.435	8.46	–	–	–	–	–	–
			60	89.29	0.489	9.53	–	–	–	–	–	–
			65	96.73	0.534	11.05	–	–	–	–	–	–
			71	105.66	0.582	14.42	–	–	–	–	–	–
13 3/8	13.375	339.73	48	71.43	0.33	8.38	PS	–	–	–	–	–
			54.5	81.1	0.38	9.65	–	PSB	–	–	–	–
			61	90.78	0.43	10.92	–	PSB	–	–	–	–
			68	101.19	0.48	12.19	–	PSB	PSB	PSB	PSB	PSB
			72	107.15	0.514	13.06	–	–	PSB	PSB	PSB	PSB
16	16	406.4	65	96.73	0.375	9.53	PS	–	–	–	–	–
			75	111.61	0.438	11.13	–	PSB	–	–	–	–
			84	125.01	0.495	12.57	–	PSB	–	–	–	–
			109	162.21	0.656	16.66	–	P	P	P	–	P
18 5/8	18.625	473.08	87.5	130.21	0.435	11.05	PS	PSB	–	–	–	–
20	20	508	94	139.89	0.438	11.13	PSL	PSLB	–	–	–	–
			106.5	158.49	0.5	12.7	–	PSLB	–	–	–	–
			133	197.93	0.635	16.13	–	PSLB	–	–	–	–
P——Plain；S——Short-thread；L——Long-thread；B——Buttress thread；E——Extreme thread

Chemical Composition (%) of API 5CT

Chemical Composition of API 5CT，Mass Fraction（%）
Group	Grade	Type	C		Mn		Mo		Cr		Ni	Cu	P	S	Si
Group	Grade	Type	min.	max.	min.	max.	min.	max.	min.	max.	max.	max.	max.	max.	max.
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	—	1.9	—	—	—	—	—	—	0.03	0.03	0.45
2	M65	—	—	—	—	—	—	—	—	—	—	—	0.03	0.03	—
	L80	1	—	0.43	—	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
	L81	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	0.85	—	1.5	0.99	—	0.02	0.01	—
	T95	1	—	0.35	—	1.2	0.25	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	—	—	—	—	—	—	—	—	—	—	—	0.03	0.03	—
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 WT 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 WT 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.

Mechanical Properties of API 5CT

Mechanical Properties
Group	Grade	Type	Total	Yield Strength (Mpa)		Tensile	Hardness max
Group	Grade	Type	%	min.	max.	MPa	HRC	HBW
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	445	586	586	22	235
	L80	1	0.5	552	655	655	23	241
	L80	9Cr	0.5	552	655	655	23	241
	L81	13Cr	0.5	552	655	655	23	241
	C90	1	0.5	621	724	689	25.4	255
	T95	1	0.5	655	758	724	25.4	255
	C110	—	0.7	758	828	793	30	286
3	P110	—	0.6	758	965	862	—	—
4	Q125	1	0.65	862	1034	931	—	—
a. In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b. No hardness limits, but the maximum variation is controlled by manufacturer acc API 5CT.

API 5CT Dimensional Deviation

Items		Allowable Deviation
Out Diameter	D ≤ 101.60mm	± 0.79mm
Out Diameter	D ≥ 114.30mm	+ 1.0%, -0.5%
Wall Thickness		-12.50%
Mass (Single Lengths)		+6.5%, -3.5%

Length Range of API 5CT Tube&casing table

Length
Item	Scope 1	Scope 2	Scope 3
Tubing	6.10-7.32m	8.53-9.75m	–
Casing	4.88-7.62m	7.62-10.36m	10.36-14.63m

Test and inspection of API 5CT Tubing and Casing

-API 5CT Hydrostatic Test

Water pressure test is a very important test in the production process of welded steel pipe, its purpose is to check whether the weld can be in the required water pressure, without cracks live leakage and other problems. It should be noted that who yah test is not once passed, the pipeline needs to be repeatedly tested and rigorously inspected, if there is a problem, it needs to be repaired immediately and repeat the inspection. This test is an important indicator of the operation of the pipeline in a high-pressure environment.

- API 5CT Bend Test

The bend test is a test to evaluate the weld quality of API 5CT tubing and casing. Bending test is an important part of the production process, but also an indispensable link, it by testing the plasticity of the steel pipe to ensure that the production of products have sufficient bending properties. A sample steel pipe is applied with bending equipment to produce a bending force of 90 to 180 degrees, which is then inspected and evaluated. If no cracks are found, the pipe quality is up to standard. If there are cracks and deformation or other defects, it needs to be replaced.

- API 5CT Flattening Test

Flattening tests assess the resistance of samples to longitudinal deformation (i.e., crack expansion) and their ability to remain undeformed when subjected to stress. The process of the experiment is about preparing the test sample, applying a certain axial pressure to the experimental machine to make the pipeline flattened and deformed under fixed conditions, and then recording whether there is a crack on the surface and judging whether it is qualified according to API 5CT standard.

- API 5CT CVN Impact Test

Impact testing, also known as Charpy testing, is a quality control measure used to assess a material’s ability to withstand impact during the inspection of tubing and casing. By using a shock tester to randomly shock a sample, apply pressure, and subsequently measure the absorbed energy. The results of fracture morphology were recorded and compared to observe whether the material meets the standard requirements. Tube bodies, welds, and heat affected zones are the main test areas. The API 5CT CVN Impact Test enables manufacturers to evaluate the toughness of pipes at low temperatures, ensuring that steel pipes produced in accordance with the standard requirements have high strength and long service life.

API 5CT Pipe Ending Processing

API 5CT species also specify methods for machining pipe ends of OCTG tubing and casing to safeguard pipeline integrity and sealing. The following are some of the API 5CT pipe end machining methods.

-Pipe Flat End Machining

First of all, flat end processing is one of the simplest processing methods, the pipe is cut into flat surfaces, this processing method can effectively prevent the accumulation of materials during transportation of pipelines, but it does not form an effective link, which requires a connector or in the processing.

-API 5CT Non-Threaded Connection

Non-threaded connection is suitable for scenes that require frequent and rapid installation and dismantling.

- Threaded Connection

Threaded connection is divided into two modes: external thread and internal thread. The fittings with internal thread receive the oil/gas transported by the fittings with external thread. Threads are also divided into long threads and short threads, etc., of which the largest sealing and load resistance is the handrail thread.

- Special Threaded Connections

In addition to standard threaded connections, TUSPIPE offers special threads. They provide better sealing and safety for pipes that need to work in extreme environments.

What is API 5CT OCTG?

OCTG is an oil and gas specialty pipe that includes casing, tubing, and drill pipe. API 5CT is the standard for these pipes, which includes wall thickness, pressure resistance, corrosion resistance, and material.
OCTG stands for “Oil Country Tubular Goods”, which means “Oil Country Tubular Goods”. With the development of science and technology, the advantages of ERW process of OCTG pipeline are more and more prominent, although there are welded seams in the welded pipe, nowadays the processing ability can make the material at the welded seams consistent with other places, which guarantees the sturdiness of welded seams of the pipeline and the low cost of production, short working time, smooth wall surface and other advantages, which has made the ERW process become a new star in the oil and gas industry.
TUSPIPE’s OCTG pipelines strictly follow API 5CT standards, which can guarantee the normal operation of oil pipes and casing in complex geological environments. And API 5CT stipulates a series of quality and standards that can make our pipelines have predictable performance and quality, and improve the service life of pipelines.

What is the Difference between API 5CT Casing and Tubing?

API 5CT casing is a pipe used to support the wellbore wall and protect the wellbore from collapse. It is stronger and heavier, with good load-bearing capacity and stability, so during the drilling process, it can effectively protect the wellbore in the outermost layer to isolate multiple formations, and play a role in isolating the fluid and support structure for the well.

API 5CT tubing is installed inside the casing and is responsible for safely transporting fluids such as oil and gas from the bottom of the well to the surface. The tubing is relatively lightweight, with the characteristics of lightweight and conductivity, while the tubing has excellent corrosion resistance and pressure resistance, and can adapt to harsh environmental conditions. Tubing and casing have their own characteristics and functional uses, therefore, if the tubing and casing can be combined, it can effectively improve the transmission efficiency of oil and gas, and enhance the safety and reliability of the project.

Why choose tuspipe for for Your Oil & Gas Needs?

TUSPIPE stands tall as an indispensable ally for the oil and gas industry. Our pipes serve as the very lifelines that efficiently channel vital resources. Understanding the criticality of high-performing pipes in this sector, we engineer our products to withstand the rigorous demands and aggressive environments typical of oil and gas applications. Our pipes are compliant with the stringent API 5CT standards for casing and tubing, ensuring unmatched strength and durability. Additionally, catering to the diverse requirements of the oil and gas sector, TUSPIPE offers a variety of thread types including but not limited to BTC, LTC, STC, and premium threads, which ensure secure and reliable connections. Choose TUSPIPE for pipes that meet the industry’s highest standards, tailored to optimize your operations in the oil and gas sector.