API 5CT Oilfield Casing and Tubing

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The API 5CT oilfield casing and tubing achieve API SPEC 5CT standards. Our tubular product is suitable for the drilling of petroleum wells. The oilfield casing is applied to support the wall of a well in the drilling process and after well completion, so as to make sure the drilling project goes on smoothly and the well can be used regularly after well completion. The oilfield tubing may transport crude oil and natural gas from a hydrocarbon reservoir to the ground.

Nearly all our casings are manufactured from quality continuous casting, and feature high purity, good homogeneity and flawless surface.

Parameters
1. Standard: API 5CT
2. Steel grade: J55, K55, N80-1
3. Delivery condition: Rolling, normalizing rolling, normalizing
4. Outer diameter: 70MM-610MM
5. Wall thickness: 6MM-35MM
6. Tolerance: In accordance with API 5CT standard
7. Length: R1, R2, R3
8. Certificate: EN 10204/3.1

Chemical Composition (Heat Analysis)%

Steel grade	Delivery condition	C (max.)	Si (max.)	Mn (max.)	P (max.)	S (max.)
J55	Rolling, normalizing rolling, normalizing	/	/	/	0.030	0.030
K55	Rolling, normalizing rolling, normalizing	/	/	/	0.030	0.030
N80-1	Rolling, normalizing rolling, normalizing	/	/	/	0.030	0.030

Mechanical Property of Oilfield Casing and Tubing

Steel grade	Yield strength (mpa)	Min. tensile strength (mpa)	Min. elongation (%)
J55	379-552	517	API 5CT standard
K55	379-552	655
N80-1	552-758	689

Oilfield Tubing Specification

Specification	Outer diameter		Wall thickness		Processing mode of ends
Specification	in.	mm	in.	mm	J55	K55	N80-1
2-7/8"	2.875	73.00	0.276	7.01	P	P	P
			0.308	7.82	P	P	P
			0.340	8.64	P	P	P
			0.392	9.96	P	P	P
			0.440	11.18	P	P	P
3-1/2"	3.500	88.90	0.254	6.45	P	P	P
			0.289	7.34	P	P	P
			0.375	9.53	P	P	P
			0.430	10.92	P	P	P
			0.476	12.09	P	P	P
			0.530	13.46	P	P	P
4"	4.000	101.60	0.262	6.65	P	P	P
			0.330	8.38	P	P	P
			0.415	10.54	P	P	P
			0.500	12.70	P	P	P
4-1/2"	4.500	114.30	0.271	6.88	P	P	P
			0.337	8.56	P	P	P
			0.380	9.65	P	P	P
			0.430	10.92	P	P	P
			0.500	12.70	P	P	P
			0.560	14.22	P	P	P
			0.630	16.00	P	P	P

Oilfield Casing Specification

Specification	Outer diameter		Wall thickness		Processing mode of ends
Specification	in.	mm	in.	mm	J55	K55	N80-1
4-1/2"	4.500	114.3	0.250	6.35	P	P	P
			0.290	7.37	P	P	P
			0.337	8.56	P	P	P
5	5.000	127	0.253	6.43	P	P	P
			0.296	7.52	P	P	P
			0.362	9.19	P	P	P
			0.437	11.10	P	P	P
			0.478	12.14	P	P	P
			0.500	12.70	P	P	P
5-1/2"	5.500	139.7	0.244	6.20	P	P	P
			0.275	6.99	P	P	P
			0.304	7.72	P	P	P
			0.361	9.17	P	P	P
			0.415	10.54	P	P	P
			0.500	12.70	P	P	P
			0.562	14.27	P	P	P
			0.625	15.88	P	P	P
			0.687	17.45	P	P	P
			0.750	19.05	P	P	P
			0.812	20.62	P	P	P
			0.875	22.22	P	P	P
6-5/8"	6.625	168.3	0.288	7.32	P	P	P
			0.352	8.94	P	P	P
			0.417	10.59	P	P	P
			0.475	12.07	P	P	P
7	7.000	177.8	0.317	8.05	P	P	P
			0.362	9.19	P	P	P
			0.408	10.36	P	P	P
			0.453	11.51	P	P	P
			0.498	12.65	P	P	P
			0.540	13.72	P	P	P
			0.625	15.88	P	P	P
			0.687	17.45	P	P	P
			0.750	19.05	P	P	P
			0.812	20.62	P	P	P
			0.875	22.22	P	P	P
7-5/8"	7.625	193.68	0.300	7.62	P	P	P
			0.328	8.33	P	P	P
			0.375	9.52	P	P	P
			0.430	10.92	P	P	P
			0.500	12.70	P	P	P
			0.562	14.27	P	P	P
			0.595	15.11	P	P	P
			0.625	15.88	P	P	P
			0.687	17.45	P	P	P
			0.750	19.05	P	P	P
8-5/8"	8.625	219.08	0.304	7.72	P	P	P
			0.352	8.94	P	P	P
			0.400	10.16	P	P	P
			0.450	11.43	P	P	P
			0.500	12.70	P	P	P
			0.557	14.15	P	P	P
9-5/8"	9.625	244.48	0.352	8.94	P	P	P
			0.395	10.03	P	P	P
			0.435	11.05	P	P	P
			0.472	11.99	P	P	P
			0.545	13.84	P	P	P
			0.595	15.11	P	P	P
			0.609	15.47	P	P	P
			0.672	17.07	P	P	P
			0.734	18.64	P	P	P
			0.797	20.24	P	P	P
10-3/4"	10.750	273.05	0.350	8.89	P	P	P
			0.400	10.16	P	P	P
			0.450	11.43	P	P	P
			0.495	12.57	P	P	P
			0.545	13.84	P	P	P
			0.595	15.11	P	P	P
			0.672	17.07	P	P	P
			0.734	18.64	P	P	P
			0.797	20.24	P	P	P
11-3/4"	11.750	298.45	0.333	8.46	P	P	P
			0.375	9.53	P	P	P
			0.435	11.05	P	P	P
			0.489	12.42	P	P	P
			0.534	13.56	P	P	P
			0.582	14.78	P	P	P
13-3/8"	13.375	339.72	0.430	10.92	P	P	P
			0.480	12.19	P	P	P
			0.514	13.06	P	P	P
Notes: 1. “P” refers to plain end. 2. Customization is available with other specification.

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