API Specification 5CT Oil Casing API 5CT Grade J55 OCTG Petroleum casing pipe suppliers in China

Short Description:

Our API 5CT grade J55 oil casing is made of high quality steel and is available in various grades such as J55, K55, N80, L80 and P110 to meet different operating requirements. The J55 grade, in particular, has excellent corrosion resistance and high tensile strength, making it an ideal choice for cased wells in harsh environments.

Our API 5CT grade J55 oil casing is designed to provide a durable protective lining for oil and gas wells, protecting the integrity of the wellbore and ensuring efficient production. With its precision engineering and seamless construction, the bushing provides superior performance in withstanding high pressures, extreme temperatures and corrosive elements.

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API 5CT J55 Casing Tubing Specification

The J55 API casing or tubing is a relatively common one in oil drilling. Because of the low steel grade of J55, it is used for shallow oil and gas extraction. Due to its low price among other grades of steel, it enjoys broader applications. The J55 API casing or tubing is widely used in the extraction of natural gas and coalbed methane, and can be commonly found in shallow wells, geothermal wells, and water wells.

API 5CT J55 Casing Tubing Type of Casing：

— short round thread casing (SC)

— long round thread casing (LC)

— buttress thread casing (BC)

API 5CT J55 Casing Tubing Chemical Composition:

Chemical Composition, Mass Fraction (%)
Grade		C		Mn		Mo		Cr		Ni	Cu	P	S	Si
Grade	Type	min	max	min	max	min	max	min	max	max	max	max	max	max
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
H40	—	—	—	—	—	—	—	—	—	—	—	—	0.03	—
J55	—	—	—	—	—	—	—	—	—	—	—	—	0.03	—
K55	—	—	—	—	—	—	—	—	—	—	—	—	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
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	0.03	1
L80	13Cr	0.15	0.22	0.25	1	—	—	12	14	0.5	0.25	0.02	0.03	1
C90	1	—	0.35	—	1.2	0.25 b	0.85	—	1.5	0.99	—	0.02	0.03	—
T95	1	—	0.35	—	1.2	0.25 b	0.85	0.4	1.5	0.99	—	0.02	0.03	—
C110	—	—	0.35	—	1.2	0.25	1	0.4	1.5	0.99	—	0.02	0.03	—
P110	e	—	—	—	—	—	—	—	—	—	—	0.030 e	0.030 e	—
Q125	1	—	0.35		1.35	—	0.85	—	1.5	0.99	—	0.02	0.01	—
NOTE Elements shown shall be reported in product analysis.
a The carbon content for L80 may be increased up to 0.50 % maximum if the product is oil-quenched or polymer-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.

API 5CT J55 Casing Tubing Mechanical Properties:

Tensile and Hardness Requirements
Grade			Yield Strength MPa		Tensile Strength	Hardness a,c		Specified Wall Thickness	Allowable Hardness Variation b
	Type	Total Elongation Under Load	Yield Strength MPa		min MPa	max		Specified Wall Thickness	Allowable Hardness Variation b
			min	max		HRC	HBW	mm	HRC
1	2	3	4	5	6	7	8	9	10
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	—	—	—	—
L80 L80	1	0.5	552	655	655	23	241	—	—
L80	9Cr 13Cr	0.5	552	655	655	23	241	—	—
		0.5	552	655	655	23	241	—	—
C90	1	0.5	621	724	689	25.4	255	£12.70	3
								12.71 to 19.04	4
								19.05 to 25.39	5
								³ 25.40	6
T95	1	0.5	655	758	724	25.4	255	£12.70	3
								12.71 to 19.04	4
								19.05 to 25.39	5
								³ 25.40	6
C110	—	0.7	758	828	793	30	286	£12.70	3
								12.71 to 19.04	4
								19.05 to 25.39	5
								³ 25.40	6
P110	—	0.6	758	965	862	—	—	—	—
Q125	1	0.65	862	1034	931	b	—	£12.70	3
								12.71 to 19.04 19.05	4
									5
a In case of dispute, laboratory Rockwell C hardness testing shall be used as the referee method.
b No hardness limits are specified, but the maximum variation is restricted as a manufacturing control in accordance with 7.8 and 7.9.
c For through-wall hardness tests of Grades L80 (all types), C90, T95 and C110, the requirements stated in HRC scale are for maximum mean hardness number.

API 5CT J55 Casing Tubing Range Lengths

	Range 1	Range 2	Range 3
CASING (PE/T and C/SF)
Total range length, inclusive Permissible variation, max a	4.88 to 7.62 1.83	7.62 to 10.36	10.36 to 14.63 1.83
		1.52
TUBING AND CASING USED AS TUBING
(PE/T and C/SF)
Total range length, inclusive Permissible variation, max a	6.10 to 7.32 b	8.53 to 9.75 c	11.58 to 12.80 d
	0.61	0.61	0.61
INTEGRAL TUBING CONNECTIONS (including IJ/PE
and IJ/SF)
Total range length, inclusive Permissible variation, max a	6.10 to 7.92 e	8.53 to 10.36	11.58 to 13.72 0.61
	0.61	0.61
PUP JOINTS	Lengths: 0.61; 0.91; 1.22; 1.83; 2.44; 3.05 and 3.66 e
	Tolerance: ±0.076
a Length variation applies to rail car shipment to the point of use and does not apply to order items of less than 18,144 kg of pipe.
b By agreement between purchaser and manufacturer, the maximum length may be increased to 8.57 m.
c By agreement between purchaser and manufacturer, the maximum length may be increased to 10.76 m.
d By agreement between purchaser and manufacturer, the maximum length may be increased to 17.72 m.0.61 m pup joints may be furnished up to 0.91 m long by agreement between purchaser and manufacturer, and lengths other than those listed may be furnished by agreement between purchaser and manufacturer.

API 5CT J55 Casing Tubing applicable end-finish

Casing List (sizes, masses, wall thickness, grade, and applicable end-finish)

Labels		Outside diameter (d/mm)	T&C (kg/m)	Wall thickness (t/mm)	Type of end-finish

1	2				J55/K55	M65	L80/R95	N80-1/Q	C90/T95	P110	Q125
4-1/2	9.50	114.30	14.14	5.21	PS	PS	-	-	-	-	-
	10.50	114.30	15.63	5.69	PSB	PSB	-	-	-	-	-
	11.60	114.30	17.26	6.35	PSLB	PLB	PLB	PLB	PLB	PLB	-
	13.50	114.30	20.09	7.37	-	PLB	PLB	PLB	PLB	PLB	-
	15.10	114.30	22.47	8.56	-	-	-	-	-	PLB	PLB
5	11.50	127.00	17.11	5.59	PS	PS	-	-	-	-	-
	13.00	127.00	19.35	6.43	PSLB	PSLB	-	-	-	-	-
	15.00	127.00	22.32	7.52	PSLB	PLB	SLB	PLB	PLB	PLB
	18.00	127.00	26.79	9.19	-	PLB	SLB	PLB	PLB	PLB	PLB
	21.40	127.00	31.85	11.10	-	PLB	PLB	PLB	PLB	PLB	PLB
	23.20	127.00	34.53	12.14	-	-	PLB	PLB	PLB	PLB	PLB
	24.10	127.00	35.87	12.70	-	-	PLB	PLB	PLB	PLB	PLB
5-1/2	14.00	139.70	20.83	6.20	PS	PS	-	-	-	-	-
	15.50	139.70	23.07	6.98	PSLB	PSLB	-	-	-	-	-
	17.00	139.70	25.30	7.72	PSLB	PLB	PLB	PLB	PLB	PLB	-
	20.00	139.70	29.76	9.17	-	PLB	PLB	PLB	PLB	PLB	-
	23.00	139.70	34.23	10.54	-	PLB	PLB	PLB	PLB	PLB	PLB
	26.80	139.70	39.88	12.70	-	-	-	-	P	-	-
	29.70	139.70	44.20	14.27	-	-	-	-	P	-	-
	32.60	139.70	48.52	15.88	-	-	-	-	P	-	-
	35.30	139.70	52.53	17.45	-	-	-	-	P	-	-
	38.00	139.70	56.55	19.05	-	-	-	-	P	-	-
	40.50	139.70	60.27	20.62	-	-	-	-	P	-	-
	43.10	139.70	64.14	22.22	-	-	-	-	P	-	-
6-5/8	20.00	168.28	29.76	7.32	PSLB	PSLB	-	-	-	-	-
	24.00	168.28	35.72	8.94	PSLB	PLB	PLB	PLB	PLB	PLB	-
	28.00	168.28	41.67	10.59	-	PLB	PLB	PLB	PLB	PLB	-
	32.00	168.28	47.62	12.06	-	-	PLB	PLB	PLB	PLB	PLB
7	17.00	177.80	25.30	5.87	-	-	-	-	-	-	-
	20.00	177.80	29.76	6.91	PS	PS	-	-	-	-	-
	23.00	177.80	34.23	8.05	PSLB	PLB	PLB	PLB	PLB	-	-
	26.00	177.80	38.69	9.19	-	PLB	PLB	PLB	PLB	PLB	-
	29.00	177.80	43.16	10.36	-	PLB	PLB	PLB	PLB	PLB	-
	32.00	177.80	47.62	11.51	-	PLB	PLB	PLB	PLB	PLB	-
	35.00	177.80	52.09	12.65	-	-	PLB	PLB	PLB	PLB	PLB
	38.00	177.80	56.55	13.72	-	-	PLB	PLB	PLB	PLB	PLB
	42.70	177.80	63.55	15.88	-	-	-	-	P	-	-
	46.40	177.80	69.05	17.45	-	-	-	-	P	-	-
	50.10	177.80	74.56	19.05	-	-	-	-	P	-	-
	53.60	177.80	79.77	20.62	-	-	-	-	P	-	-
	57.10	177.80	84.98	22.22	-	-	-	-	P	-	-
7-5/8	24.00	193.68	35.72	7.62	-	-	-	-		-	-
	26.40	193.68	39.29	8.33	PSLB	PSLB	PLB	PLB	PLB	-	-
	29.70	193.68	44.20	9.52	-	PLB	PLB	PLB	PLB	PLB	-
	33.70	193.68	50.15	10.92	-	PLB	PLB	PLB	PLB	PLB	-
	39.00	193.68	58.04	12.70	-	-	PLB	PLB	PLB	PLB	PLB
	42.80	193.68	63.69	14.27	-	-	PLB	PLB	PLB	PLB	PLB
	45.30	193.68	67.42	15.11	-	-	PLB	PLB	PLB	PLB	PLB
	47.10	193.68	70.09	15.88	-	-	PLB	PLB	PLB	PLB	PLB
	51.20	193.68	76.20	17.45	-	-	-	-	P	-	-
	55.30	193.68	82.30	19.05	-	-	-	-	P	-	-
7-3/4	46.10	196.85	68.61	15.11	-	-	P	P	P	P	P
8-5/8	24.00	219.08	35.72	6.71	PS	PS	-	-	-	-	-
	28.00	219.08	41.67	7.72		PS	-	-	-	-	-
	32.00	219.08	47.62	8.94	PSLB	PSLB	-	-	-	-	-
	36.00	219.08	53.58	10.16	PSLB	PSLB	PLB	PLB	PLB	PLB	-
	40.00	219.08	59.53	11.43	-	PLB	PLB	PLB	PLB	PLB	-
	44.00	219.08	65.48	12.70	-	-	PLB	PLB	PLB	PLB	-
	49.00	219.08	72.92	14.15	-	-	PLB	PLB	PLB	PLB	PLB
9-5/8	32.30	244.48	48.07	7.92	-	-	-	-	-	-	-
	36.00	244.48	53.58	8.94	PSLB	PSLB	-	-	-	-	-
	40.00	244.48	59.53	10.03	PSLB	PSLB	PLB	PLB	PLB	-	-
	43.50	244.48	64.74	11.05	-	PLB	PLB	PLB	PLB	PLB	-
	47.00	244.48	69.95	11.99	-	PLB	PLB	PLB	PLB	PLB	PLB
	53.50	244.48	79.62	13.84	-	-	PLB	PLB	PLB	PLB	PLB
	58.40	244.48	86.91	15.11	-	-	PLB	PLB	PLB	PLB	PLB
	59.40	244.48	88.40	15.47	-	-	-	-	P	-	-
	64.90	244.48	96.58	17.07	-	-	-	-	P	-	-
	70.30	244.48	104.62	18.64	-	-	-	-	P	-	-
	75.60	244.48	112.51	20.24	-	-	-	-	P	-	-
10-3/4	32.75	273.05	48.74	7.09	-	-	-	-	-	-	-
	40.50	273.05	60.27	8.89	PSB	PSB	-	-	-	-	-
	45.50	273.05	67.71	10.16	PSB	PSB	-	-	-	-	-
	51.00	273.05	75.90	11.43	PSB	PSB	PSB	PSB	PSB	PSB	-
	55.50	273.05	82.60	12.57	-	PSB	PSB	PSB	PSB	PSB	-
	60.70	273.05	90.33	13.84	-	-	-	-	PSB	PSB	PSB
	65.70	273.05	97.77	15.11	-	-	-	-	PSB	PSB	PSB
	73.20	273.05	108.94	17.07	-	-	-	-	P	-	-
	79.20	273.05	117.87	18.64	-	-	-	-	P	-	-
	85.30	273.05	126.94	20.24	-	-	-	-	P	-	-
11-3/4	42.00	298.45	62.50	8.46	-	-	-	-	-	-	-
	47.00	298.45	69.95	9.53	PSB	PSB	-	-	-	-	-
	54.00	298.45	80.36	11.05	PSB	PSB	-	-	-	-	-
	60.00	298.45	89.29	12.42	PSB	PSB	PSB	PSB	PSB	PSB	PSB
	65.00	298.45	96.73	13.56	-	-	P	P	P	P	P
	71.00	298.45	105.66	14.78	-	-	P	P	P	P	P
13-3/8	48.00	339.72	71.43	8.38	-	-	-	-	-	-	-
	54.50	339.72	81.11	9.65	PSB	PSB	-	-	-	-	-
	61.00	339.72	90.78	10.92	PSB	PSB	-	-	-	-	-
	68.00	339.72	101.20	12.19	PSB	PSB	PSB	PSB	PSB	PSB	-
	72.00	339.72	107.15	13.06	-	-	PSB	PSB	PSB	PSB	PSB
16	65.00	406.40	96.73	9.53	-	-	-	-	-	-	-
	75.00	406.40	111.62	11.13	PSB	PSB	-	-	-	-	-
	84.00	406.40	125.01	12.57	PSB	PSB	-	-	-	-	-
	109.00	406.40	162.21	16.66	P	-	P	P	-	P	P
18-5/8	87.50	473.08	130.22	11.05	PSB	PSB	-	-	-	-	-
20	94.00	508.00	139.89	11.13	PSLB	PSLB	-	-	-	-	-
	106.50	508.00	158.49	12.70	PSLB	PSLB	-	-	-	-	-
	133.00	508.00	197.93	16.13	PSLB	-	-	-	-	-	-

* P - plain end, S - short round thread, B - buttress, L - long round thread.

API 5CT J55 Casing Tubing Grade Color Codes

Grade	Grade Type	Number and Color of Bands for Product a with Length ³ 1.8 m	Color(s) for Couplings
			Entire Coupling	Band(s) b, c
1	2	3	4	5
H40	—	None or black band at the manufacturer’s option	None	Same as for pipe
J55 Tubing	—	One bright green	Bright green	None
J55 Casing	—	One bright green	Bright green	One white
K55	—	Two bright green	Bright green	None
N80	1	One red	Red	None
N80	Q	One red, one bright green	Red	Green
R95	—	One brown	Brown	None
L80	1	One red, one brown	Red	One brown
L80	9Cr	One red, one brown, two yellow	None	Two yellow
L80	13Cr	One red, one brown, one yellow	None	One yellow
C90	1	One purple	Purple	None
T95	1	One silver	Silver	None
C110	—	One white, two brown	White	Two brown
P110	—	One white	White	None
Q125	1	One orange	Orange	None
a In the case of coupling material, unless otherwise specified in the purchase agreement, the manufacturer's internal requirements shall govern.
b Special clearance couplings shall also have a black band.
c Seal-ring couplings shall also have a blue band.

API Round Thread and Buttress Thread

Labels a							Calculated Mass c
			Nominal Linear Mass T& C b,c	Wall Thick- ness				em, Mass Gain or Loss Due to End Finishing d
		Outside Diameter			Inside Diameter	Drift Diameter	Plain- end	kg
								Round Thread		Buttress Thread
							wpe
		D	kg/m	t	D	mm	kg/m	Short	Long	RC	SCC
		mm		mm	mm
1	2	3	4	5	6	7	8	9	10	11	12
4 1/2	9.5	114.3	14.38	5.21	103.88	100.7	14.02	3.64	—	— 4.53	— 1.12
4 1/2	10.5	114.3	15.73	5.69	102.92	99.74	15.24	3.33	— 3.61	4.32	0.91
4 1/2	11.6	114.3	17.38	6.35	101.6	98.42	16.91	3.18	3.35	4.07	0.6
4 1/2	13.5	114.3	19.87	7.37	99.56	96.38	19.44	—	3.53	3.64	0.24
4 1/2	15.1	114.3	22.69	8.56	97.18	94	22.32	—
5	11.5	127	17.19	5.59	115.82	112.64	16.74	4.32	— 4.85	— 5.38	— 1.24
5	13	127	19.69	6.43	114.14	110.96	19.12	4	4.51	4.99	0.61
5	15	127	22.69	7.52	111.96	108.78	22.16	3.71	4.52	4.4	0.22
5	18	127	27.19	9.19	108.62	105.44	26.7	—	3.45	3.76	–0.62
5	21.4	127	32.13	11.1	104.8	101.62	31.73	—	3.15	3.42	–0.96
5	23.2	127	34.76	12.14	102.72	99.54	34.39	—	2.99	3.23	–1.14
5	24.1	127	36.15	12.7	101.6	98.42	35.8	—
5 1/2	14	139.7	20.91	6.2	127.3	124.12	20.41	4.6	— 5.26	— 5.71	— 0.87
5 1/2	15.5	139.7	23.48	6.98	125.74	122.56	22.85	4.36	5.31	5.41	0.58
5 1/2	17	139.7	25.72	7.72	124.26	121.08	25.13	4.14	4.5	4.84	0.45
5 1/2	20	139.7	30.05	9.17	121.36	118.18	29.52	—	4.37	4.31	-0.52
5 1/2	23	139.7	34.05	10.54	118.62	115.44	33.57	—	—	—	—
5 1/2	26.8	139.7	40.15	12.7	114.3	111.12	39.78	—	—	—	—
5 1/2	29.7	139.7	44.47	14.27	111.16	107.98	44.14	—	—	—	—
5 1/2	32.6	139.7	48.74	15.88	107.94	104.76	48.49	—	—	—	—
5 1/2	35.3	139.7	52.8	17.45	104.8	101.62	52.61	—	—	—	—
5 1/2	38	139.7	56.82	19.05	101.6	98.42	56.68	—	—	—	—
5 1/2	40.5	139.7	60.64	20.62	98.46	95.28	60.55	—	—	—	—
5 1/2	43.1	139.7	64.41	22.22	95.26	92.08	64.38	—
6 5/8	20	168.28	29.76	7.32	153.64	150.46	29.06	5.58	6.23	6.35	0.89
6 5/8	24	168.28	35.72	8.94	150.4	147.22	35.13	4.42	5.48	5.52	0.68
6 5/8	28	168.28	41.67	10.59	147.1	143.92	41.18	—	4.73	4.71	–0.75
6 5/8	32	168.28	47.62	12.06	144.16	140.98	46.46	—	4.73	4	–1.46