J55 K55 N80 Oil Tubing and Casing Steel Pipe

Short Description:

Standard: API 5L, API 5CT, ASTM A106/A53, ASTM A519, JIS G3441, JIS G3444, JIS G3445 DIN 2391, EN10305, EN10210, ASME SA106, SA192, SA210, SA213, SA335,

Steel Grade: J55 K55 L80 L80-13Cr N80-1 N80-Q N80-1 C90 C95 T95 P110 Q125

Certificate: API 5L PSL1 / PSL2, API 5CT, ISO 9001-2008

Out Diameter: 1/8 – 36 inch (10.3-914.4mm)

Wall Thickness: 1.73-40mm

Length: Random Length, Fixed Length, SRL, DRL

Process: Seamless Steel Pipe (SMLS Steel Pipe)

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Overview of N80 K55 OCTG Tubing Pipe

Oil casing is a steel pipe used to support the walls of oil and gas wells to ensure the normal operation of the entire oil well after the drilling process and completion. Each well uses several layers of casing according to different drilling depths and geological conditions. Cement cementing is used after the casing is lowered into the well. Unlike oil pipes and drill pipes, it cannot be reused and is a one-time consumable material. Therefore, the consumption of casing accounts for more than 70% of all oil well pipes。

API-5CT-Seamless-Steel-Pipe-with-J55-K55-N80-L80-N80q-P110-Casing-and-Tube (2)

Specifications of Oil Tubing and Casing Steel Pipe

Label				D Outside diameter mm	Wall thickness t mm	C Type of end-finish
1	2
	NU T&C	EU T&C	IJ
						H40	J55	L80	N80 1Q	C90	T95	P110

1	2	3	4	5	9	10	11	12	13	14	15	16
1.9	2.75	2.9	2.76	48.26	3.68	PNUI	PNUI	PNUI	PNUI	PNUI	PNUI	-
1.9	3.65	3.73	-	48.26	5.08	PU	PU	PU	PU	PU	PU	PU
1.9	4.42	-	-	48.26	6.35	-	-	P	-	P	P	-
2 3/8	4	-	-	60.32	4.24	PU	PN	PN	PN	PN	PN	-
2 3/8	4.6	4.7	-	60.32	4.83	PNU	PNU	PNU	PNU	PNU	PNU	PNU
2 3/8	5.8	5.95	-	60.32	6.45	-	-	PNU	PNU	PNU	PNU	PNU
2 3/8	6.6	-	-	60.32	7.49	-	-	P	-	P	P	-
2 3/8	7.35	7.45	-	60.32	8.53	-	-	PU	-	PU	PU	-
2 7/8	6.4	6.5	-	73.02	5.51	PNU	PNU	PNU	PNU	PNU	PNU	PNU
2 7/8	7.8	7.9	-	73.02	7.01	-	-	PNU	PNU	PNU	PNU	PNU
2 7/8	8.6	8.7	-	73.02	7.82	-	-	PNU	PNU	PNU	PNU	PNU
2 7/8	9.35	9.45	-	73.02	8.64	-	-	PU	-	PU	PU	-
2 7/8	10.5	-	-	73.02	9.96	-	-	P	-	P	P	-
3 1/2	7.7	-	-	88.9	5.49	PN	PN	PN	PN	PN	PN	-
3 1/2	9.2	9.3	-	88.9	6.45	PNU	PNU	PNU	PNU	PNU	PNU	PNU
3 1/2	10.2	-	-	88.9	7.34	PN	PN	PN	PN	PN	PN	-
3 1/2	12.7	12.95	-	88.9	9.52	-	-	PNU	PNU	PNU	PNU	PNU
3 1/2	14.3	-	-	88.9	10.92	-	-	P	-	P	P	-
3 1/2	15.5	-	-	88.9	12.09	-	-	P	-	P	P	-
4	9.5	-	-	101.6	5.74	PN	PN	PN	PN	PN	PN	-
4	10.7	11	-	101.6	6.65	PU	PU	PU	PU	PU	PU	-
4	13.2	-	-	101.6	8.38	-	-	P	-	P	P	-
4	16.1	-	-	101.6	10.54	-	-	P	-	P	P	-
4 1/2	12.6	12.75	-	114.3	6.88	PNU	PNU	PNU	PNU	PNU	PNU	-
4 1/2	15.2	-	-	114.3	8.56	-	-	P	-	P	P	-

Mechanical Properties of N80 K55 OCTG Tubing Pipe

Group	Grade	Type	Total elongation under load %	Yield strength Mpa		Tensile strength min MPa	Hardness max
				min	max		HRC	HBW
1	2	3	4	5	6	7	8	9
1	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	-	-
2	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?2	0.5	621	724	689	25.4	255
	C95	-	0.5	655	758	724	-	-
	T95	1?2	0.5	655	758	724	25.4	255
3	P110	-	0.6	758	965	862	-	-
4	Q125	All	0.65	862	1034	931	-	-

API 5L-Seamless-Steel-Casing-Drill-Pipe-steel Tubing for Oil-Well-Drilling (24)

Reference Inspection for J55/K55

Visual inspection for pipe surface
Dimension check
Mechanical test on tensile strength, yield strength and elongation
Chemical analysis
NDT test including Magnetic particle, Ultrasonic Test, Hydrostatic Test
Charpy impact test
Flattening tests
Hardness test
Drift test
Thread ends check with thread gauge and coupling check

J55 VS K55 (PSL1 and PSL2)

J55 and K55 are similar material in chemical composition and mechanical properties, especially J55 has lower minimum tensile requirement and lower elongation, others specifications are same like heat treatment methods, NDE test, Charpy Impact test, hydrostatic test.
J55/K55 minimum yield strength: 379-552 Mpa;
J55 minimum tensile strength: 517 Mpa, elongation ≥ 19%;
K55 minimum tensile strength: 655 Mpa, elongation ≥ 15%.