API Casing

Casing in API Standard

Casing strings are the main parts of the well construction. All wells drilled for the purpose of oil or gas production (or injecting materials into underground formations) must be cased with material with sufficient strength and functionality.
 
Casing is the major structural component of a well. The cost of casing is a major part of the overall well cost, so selection of casing size, grade, connectors, and setting depth is a primary engineering and economic consideration.

With facilities in Wuxi China and Cangzhou China, Glory Tube can offer our clients worldwide the best possible pricing and expedited manner for OCTG casing and tubing with consistent high quality. From high pressure high temperature wells to sour gas applications, Glory Tube can offer the complete range of sizes and grades to suit every purpose.

Glory Tube can provide a full range of sizes and grades for every application.

Size of Casing
Outer diameter (OD): Φ114.30mm ~ Φ508mm
Wall thickness (WT): 5.21mm ~ 22.2mm

API series casing refers to the steel pipe produced as per API SPEC 5CT of the American Petroleum Institute (API), which is used for the exploitation of petroleum oil or natural gas and other resources. 
 
Glory Tube is ideally positioned to deliver API and premium threaded casing.

Glory Tube provides a complete service throughout the tubular cycle, combining the provision of tubulars, threaded accessories and connection threading. These items are critical to every stage of the exploration and production process.
 
The casing and tubing in API standard provided by Glory Tube strictly follows the API 5CT standard in terms of quality control such as chemical composition, mechanical properties, and dimensional accuracy. Within the scope of the standard, all control indicators are tightened to make the performance more stable and the quality more reliable.

In terms of composition control, strict internal control requirements are implemented, and the P and S control levels of physical smelting are far stricter than the standard requirements of API 5CT. For products with corrosion resistance requirements, the strength range is strictly controlled, and the actual control level is near the midline of the strength requirements. For other steel grades, the yield strength control level is at the upper limit of the strength requirement range; in addition, the toughness performance of the material is much higher than the API 5CT standard requirement. Through the control of strength and toughness, the physical performance of the casing and tubing is guaranteed.

Chemical Composition, Mass Fraction(%)

Steel Grade	Type	C		Mn		Mo		Cr		Ni	Cu	P	S	Si
		Min	Max	Min	Max	Min	Max	Min	Max	Max	Max	Max	Max	Max
H40	-	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
J55	-	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
K55	-	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
N80	1	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
N80	Q	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
R95	-	0	0.45	0	1.9	-	-	-	-	-	-	0.02	0.01	0.45
M65	-	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
L80	1	0	0.43	0	1.9	-	-	-	-	0.25	0.35	0.02	0.01	0.45
L80	9 Cr	0	0.15	0.3	0.6	0.9	1.1	8	10	0.5	0.25	0.015	0.01	1
L80	13 Cr	0.15	0.22	0.25	1	-	-	12	14	0.5	0.25	0.015	0.01	1
C90	1	0	0.35	0	1.2	0.25	0.85	0	1.5	0.99	-	0.015	0.01	-
T95	-	0	0.35	0	1.2	0.25	0.85	0.4	1.5	0.99	-	0.015	0.005	-
C110	-	0	0.35	0	1.2	0.25	1	0.4	1.5	0.99	-	0.015	0.005	-
P110	-	-	-	-	-	-	-	-	-	-	-	0.02	0.01	-
Q125	1	0	0.35	0	1.35	0	0.85	0	1.5	0.99	-	0.015	0.005	-

Mechanical properties of casing pipe

Grade	Type	Total elongation under load	Yield strength (MPa)		Tensile strength (MPa)	Hardness Max		Specified wall thickness	Allowable hardness variation
		m	min	max	min	HRC	HBW	mm	HRC
H40	-	0.5	276	552	517	-	-	-	-
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	-	-	-	-
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	-	0.5	621	724	689	25.4	255	≤12.70 12.71-19.04 19.05-25.39 ≥25.40	3.0 4.0 5.0 6.0
C95	-	0.5	655	758	724	-	-	≤12.70 12.71-19.04 19.05-25.39 ≥25.40	3.0 4.0 5.0 6.0
T95	-	0.5	655	758	724	25.4	255	≤12.70 12.71-19.04 19.05-25.39 ≥25.40	3.0 4.0 5.0 6.0
C110	-	0.7	758	828	793	30	286	≤12.70 12.71-19.04 19.05-25.39 ≥25.40	3.0 4.0 5.0 6.0
P110	-	0.6	758	965	862	-	-	-	-
Q125	All	0.65	862	1034	931	-	-	≤12.70 12.71-19.04 ≥19.05	3.0 4.0 5.0

Casing size

Lables		Outside diameter	Nominal linear Mass T&C	wall thickness	Type of end-finish
		mm	kg/m	mm
1	2				H40	J55 K55	M65	L80-1/9Cr/13Cr/28Cr R95	N80	C90 T95	P110	Q125
IN	PPF								1 & Q
4-1/2	9.5	114.3	14.38	5.21	PS	PS	PS	-	-	-	-	-
4-1/2	10.5	114.3	15.73	5.69	-	PSB	PSB	-	-	-	-	-
4-1/2	11.6	114.3	17.38	6.35	-	PSLB	PLB	PLB	PLB	PLB	PLB	-
4-1/2	13.5	114.3	19.87	7.37	-	-	PLB	PLB	PLB	PLB	PLB	-
4-1/2	15.1	114.3	22.69	8.56	-	-	-	-	-	-	PLB	PLB
5	11.5	127	17.19	5.59	-	PS	PS	-	-	-	-	-
5	13	127	19.69	6.43	-	PSLB	PSLB	-	-	-	-	-
5	15	127	22.69	7.52	-	PSLB	PLB	PLB	PLB	PLB	PLB	-
5	18	127	27.19	9.19	-	-	PLB	PLB	PLB	PLB	PLB	PLB
5	21.4	127	32.13	11.1	-	-	PLB	PLB	PLB	PLB	PLB	PLB
5	23.2	127	34.76	12.14	-	-	-	PLB	PLB	PLB	PLB	PLB
5	24.1	127	36.15	12.7	-	-	-	PLB	PLB	PLB	PLB	PLB
5-1/2	14	139.7	20.91	6.2	PS	PS	PS	-	-	-	-	-
5-1/2	15.5	139.7	23.48	6.98	-	PSLB	PSLB	-	-	-	-	-
5-1/2	17	139.7	25.72	7.72	-	PSLB	PLB	PLB	PLB	PLB	PLB	-
5-1/2	20	139.7	30.05	9.17	-	-	PLB	PLB	PLB	PLB	PLB	-
5-1/2	23	139.7	34.05	10.54	-	-	PLB	PLB	PLB	PLB	PLB	PLB
6-5/8	20	168.28	29.76	7.32	PS	PSLB	PSLB	-	-	-	-	-
6-5/8	24	168.28	35.72	8.94	-	PSLB	PLB	PLB	PLB	PLB	PLB	-
6-5/8	28	168.28	41.67	10.59	-	-	PLB	PLB	PLB	PLB	PLB	-
6-5/8	32	168.28	47.62	12.06	-	-	-	PLB	PLB	PLB	PLB	PLB
7	17	177.8	25.6	5.87	PS	-	-	-	-	-	-	-
7	20	177.8	29.91	6.91	PS	PS	PS	-	-	-	-	-
7	23	177.8	34.67	8.05	-	PSLB	PLB	PLB	PLB	PLB	-	-
7	26	177.8	39.14	9.19	-	PSLB	PLB	PLB	PLB	PLB	PLB	-
7	29	177.8	43.6	10.36	-	-	PLB	PLB	PLB	PLB	PLB	-
7	32	177.8	47.92	11.51	-	-	PLB	PLB	PLB	PLB	PLB	-
7	35	177.8	52.09	12.65	-	-	-	PLB	PLB	PLB	PLB	PLB
7	38	177.8	56.1	13.72	P	P	P	PLB	PLB	PLB	PLB	PLB
7-5/8	24	193.68	35.72	7.62	PS	-	-	-	-	-	-	-
7-5/8	26.4	193.68	39.29	8.33	-	PSLB	PSLB	PLB	PLB	PLB	-	-
7-5/8	29.7	193.68	44.2	9.52	-	-	PLB	PLB	PLB	PLB	PLB	-
7-5/8	33.7	193.68	50.15	10.92	-	-	PLB	PLB	PLB	PLB	PLB	-
7-5/8	39	193.68	58.04	12.7	-	-	-	PLB	PLB	PLB	PLB	PLB
7-5/8	42.8	193.68	63.69	14.27	-	-	-	PLB	PLB	PLB	PLB	PLB
7-5/8	45.3	193.68	67.41	15.11	-	-	-	PLB	PLB	PLB	PLB	PLB
7-5/8	47.1	193.68	70.09	15.88	-	-	-	PLB	PLB	PLB	PLB	PLB
8-5/8	24	219.08	35.72	6.71	-	PS	PS	-	-	-	-	-
8-5/8	28	219.08	41.67	7.72	PS	-	PS	-	-	-	-	-
8-5/8	32	219.08	47.62	8.94	PS	PSLB	PSLB	-	-	-	-	-
8-5/8	36	219.08	53.57	10.16	-	PSLB	PSLB	PLB	PLB	PLB	-	-
8-5/8	40	219.08	59.53	11.43	-	-	PLB	PLB	PLB	PLB	PLB	-
8-5/8	44	219.08	65.48	12.7	-	-	-	PLB	PLB	PLB	PLB	_
8-5/8	49	219.08	72.92	14.15	-	-	-	PLB	PLB	PLB	PLB	PLB
9-5/8	32.3	244.48	48.07	7.92	PS	-	-	-	-	-	-	-
9-5/8	36	244.48	53.57	8.94	PS	PSLB	PSLB	-	-	-	-	-
9-5/8	40	244.48	59.53	10.03	-	PSLB	PSLB	PLB	PLB	PLB	-	-
9-5/8	43.5	244.48	64.73	11.05	-	-	PLB	PLB	PLB	PLB	PLB	-
9-5/8	47	244.48	69.94	11.99	-	-	PLB	PLB	PLB	PLB	PLB	PLB
9-5/8	53.5	244.48	79.62	13.84	-	-	-	PLB	PLB	PLB	PLB	PLB
9-5/8	58.4	244.48	86.91	15.11	-	-	-	PLB	PLB	PLB	PLB	PLB
10-3/4	32.75	273.05	48.74	7.09	PS	-	-	-	-	-	-	-
10-3/4	40.5	273.05	60.27	8.89	PS	PSB	PSB	-	-	-	-	-
10-3/4	45.5	273.05	67.71	10.16	-	PSB	PSB	-	-	-	-	-
10-3/4	51	273.05	75.9	11.43	-	PSB	PSB	PSB	PSB	PSB	PSB	-
10-3/4	55.5	273.05	82.59	12.57	-	-	PSB	PSB	PSB	PSB	PSB	-
10-3/4	60.7	273.05	90.33	13.84	-	-	-	-	-	PSB	PSB	PSB
10-3/4	65.7	273.05	97.77	15.11	-	-	-	-	-	PSB	PSB	PSB
11-3/4	42	298.45	62.5	8.46	PS	—	P	—	—	—	—	—
11-3/4	47	298.45	69.94	9.53		PSB	PSB	—	—	—	—	—
11-3/4	54	298.45	80.36	11.05		PSB	PSB	—	—	—	—	—
11-3/4	60	298.45	89.29	12.42		PSB	PSB	PSB	PSB	PSB	PSB	PSB
13-3/8	48	339.72	71.43	8.38	PS	—	—	—	—	—	—	—
13-3/8	54.5	339.72	81.1	9.65		PSB	PSB	—	—	—	—	—
13-3/8	61	339.72	90.78	10.92		PSB	PSB	—	—	—	—	—
13-3/8	68	339.72	101.19	12.19		PSB	PSB	PSB	PSB	PSB	PSB	—
13-3/8	72	339.72	107.15	13.06		P	P	PSB	PSB	PSB	PSB	PSB
16	65	406.4	96.73	9.53	PS	—	—	—	—	—	—	—
16	75	406.4	111.61	11.13		PSB	PSB	—	—	—	—	—
16	84	406.4	125.01	12.57		PSB	PSB	—	—	—	—	—
18-5/8	87.5	473.08	130.21	11.05	PS	PSB	PSB	—	—	—	—	—
20	94	508	139.89	11.13	PSL	PSLB	PSLB	—	—	—	—	—
20	106.5	508	158.49	12.7		PSLB	PSLB					—
20	133	508	197.93	16.13		PSLB	P					—
S - short round thread; L - long round thread; B - Buttress thresd

Applied Standards
API Spec 5CT Casing and Tubing
API Spec 5B (16th Edition, December 2017) Threading, Gauging, and Inspection of Casing, Tubing, and Line Pipe Threads
ISO 11960:2014 Petroleum and natural gas industries — Steel pipes for use as casing or tubing for wells
GB/T 19830-2017 Petroleum and natural gas industries—Steel pipes for use as casing or tubing for wells
 
Covering API Spec 5CT PSL1, PSL2, PSL3
 
Grade
We can provide casing and tubing with various wall thicknesses including H40, J55, K55, M65, N80-1, N80-Q, L80-1, L80-9Cr, L80-13Cr, C90, C95, T95, P110, Q125, etc.