Technical Summary: API 5CT Casing and Tubing (L80, P110, 13Cr)

As a specialized provider for the upstream oil and gas industry, we offer a comprehensive range of API 5CT Casing and Tubing designed for high-pressure, high-temperature (HPHT) and corrosive well environments. Our inventory focuses on high-strength and corrosion-resistant alloys (CRA), including L80 (13Cr) for $C O_{2}$ resistance and P110 for deep-well high-collapse requirements.

We support a variety of connection types, ranging from standard API threads (STC, LTC, BTC) to Premium Connections engineered for gas-tight integrity in horizontal and offshore applications. Every joint is manufactured under strict quality control, ensuring metallurgical stability for sour service (H2S) and high-torque operations.

Standards: API SPEC 5CT (Latest Edition).
Main Grades: J55, K55, N80-1, N80-Q, L80-1, P110, and 13Cr.
Connections: BTC, STC, LTC, and Premium Gas-Tight Connections.
Testing & Quality: Full compliance with Drift Testing, Hydrostatic Testing, and Electromagnetic Inspection (EMI) to ensure 100% structural integrity.

13Cr Technical Resource Center

Primary Engineering Guide

Technical Guide: Understanding the Benefits of 13 Chrome (13Cr) Tubing Pipe

An essential overview of metallurgical properties and performance advantages in $C O_{2}$ environments.

Engineering Deep Dives & Compliance

13Cr Compliance: Navigating the API 5CT vs. NACE MR0175 Hardness Trap

Critical insights for quality control on balancing hardness requirements between standard API and sour service specs.

Material Selection Economics: 13Cr vs. Super 13Cr vs. Inhibited Carbon Steel

A cost-benefit analysis for well completion managers choosing between corrosion-resistant alloys and chemical inhibition.

Beyond API 5CT: Understanding the NACE MR0175 'Cliff Edge' for 13Cr & Duplex

Technical limits of 13Cr and Duplex stainless steels in high-chloride and high-temperature environments.

Field Performance & Case Studies

Field Failure Forensics: Preventing L80-13Cr Pitting and Thread Galling

Best practices for handling and running 13Cr tubing to avoid costly downhole failures and connection damage.

Project Case Study: 1.4 1/2” 13 Chrome Tubing Supply for Africa Energy Project

Real-world execution of large-scale 13Cr completion string logistics and quality assurance.

Application Of Casing&Tubing

Oil casing steel pipes are specialized pipes used in the oil and gas industry for drilling, completing, and producing oil and natural gas wells,which are typically made of high-strength carbon or alloy steel and come in various sizes and dimensions to suit different well specifications.

Oil tubing steel pipes is a type of steel pipe designed for the extraction of oil and gas from wells, which are particularly used in the production phase of oil and natural gas wells,with smaller diameters compared to casing pipes. Tubing pipes are installed inside casing pipes and extend from the wellhead to the bottom of the well, serve as conduits for the transportation of oil, natural gas, and other fluids.

Application of Casing&Tubing

Specifications Of Casings

OD: 4.5’’ to 20’’

Grade: J55, K55, N80, L80, P110, Q125, V150, L80-1Cr, L80-3Cr, L80-9Cr, L80-13Cr

Standard: API 5CT

Connection: P(Plain end), STC (short threads), LTC (long threads), BTC (buttress threads), premium connection

Length: Range3

Product Specification Level: PSL1, PSL2, PSL3

Specifications Of Tubings

OD: 1.9’’ to 4.5’’

Grade: J55, K55, N80, L80, P110, Q125, V150, L80-1Cr, L80-3Cr, L80-9Cr, L80-13Cr

Standard: API 5CT

Connection: Non-upset ends (NUE), External upset ends (EUE) premium connection

Length: Range2

Product Specification Level: PSL1, PSL2, PSL3

Color Ring On Casing&Tubing

Sulfur Corrosion Resistant&High Collapse Casing And Tubing

Sulfur corrosion-resistant and high-collapse casing and tubing are specialized materials used in the oil and gas industry, particularly in environments where high levels of sulfur are present. These materials are typically made from special alloys that are highly resistant to corrosion in the presence of sulfur compounds. Common alloys include chromium, nickel, and molybdenum.

Grades Of Chrome Casing&Tubing: 1cr, 3cr, 9cr, 13cr, super 13cr(chrome, 1%cr, 3%cr, 9%cr, 13%)

Grades Of Sulfur Corrosion Resistant Casing&Tubing: 80SS, 95SS, 100SS, 110SS

Grades Of High Collapse Casing&Tubing: 80HC, 95HC, 110HC, 125HC, 140HC

*upon technical agreement with clients to meet different demand of materials

GOST Casing&Tubing

GOST standard(GOST 632, GOST 633, GOST 8645) is standard of casing&tubing mainly used by middle Asian countries.

GOST1

Connection:

Casing: OTTM&OTTG

Tubing: NU&EU

Connection1 Connection2

Production Process Of Casing Pipe

Production Process Of Tubing Pipe

Chemical Composition

Table C.4—Chemical Composition,Mass Fraction (%)
Grade	Type	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	-	-	-	-	-	-	-	-	-	-	-	-	0.030	-
J55	-	-	-	-	-	-	-	-	-	-	-	-	0.030	-
K55	-	-	-	-	-	-	-	-	-	-	-	-	0.030	-
N80	1	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
N80	Q	-	-	-	-	-	-	-	-	-	-	0.030	0.030	-
R95	-	-	0.45C	-	1.90	-	-	-	-	-	-	0.030	0.030	0.45
L80	1	-	0.43A	-	1.90	-	-	-	-	0.25	0.35	0.030	0.030	0.45
L80	9Cr	—	0.15	0.30	0.60	0.90	1.10	8.00	10.00	0.50	0.25	0.020	0.030	1.00
L80	13Cr	0.15	0.22	0.25	1.00	-	-	12.0	14.0	0.50	0.25	0.020	0.030	1.00
C90	1	-	0.35	-	1.20	0.2b	0.85	-	1.50	0.99	-	0.020	0.030	-
T95	1	-	0.35	-	1.20	0.2b	0.85	0.40	1.50	0.99	-	0.020	0.030	-
C110	-	-	0.35	-	1.20	0.25	1.00	0.40	1.50	0.99	-	0.020	0.030	-
P110	e	-	-	-	-	-	-	-	-	-	-	0.030e	0.030 e	-
Q125	1	-	0.35	-	1.35	-	0.85	-	1.50	0.99	-	0.020	0.010	-
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.

Mechanical Properties

Table C.5—Tensile and Hardness Requirements
Grade	Type	Total Elongation Under Load	Yield Strength MPa		Tensile Strengt min MPa	Hardness a,c max		Specified Wal 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 N80	1 Q	0.5 0.5	552 552	758 758	689 689	—	一 —	—	一
R95	——	0.5	655	758	724	—	—	—	—
L80 L80 L80	1 9Cr 13Cr	0.5 0.5 0.5	552 552 552	655 655 655	655 655 655	23.0 23.0 23.0	241 241 241	—— —	—
C90	1	0.5	621	724	689	25.4	255	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
T95	1	0.5	655	758	724	25.4	255	≤12.7 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 4.0 5.0 6.0
C110		0.7	758	828	793	30	286	≤12.70 12.71 to 19.04 19.05 to 25.39 ≥25.40	3.0 .0 5.0 6.0
P110		0.6	758	965	862
Q125	1	0.65	862	1034	931	b		≤12.70 12.71 to 19.04 19.05	3.0 4.0 5.0
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.

Spec (in)	Weight (Ib/ft)	outside Diameter (in)	Wall Thickness (in)	Drift Diameter (in)	PlainEnd Wpe (Ib/ft)	Type of Pipe End-finish
Spec (in)	Weight (Ib/ft)	outside Diameter (in)	Wall Thickness (in)	Drift Diameter (in)	PlainEnd Wpe (Ib/ft)	J55/K55	M65	L80/R95	N80	C90/T95	C110	P110	Q125
4.5	9.5	4.5	0.205	3.965	9.41	PS	PS
	10.5	4.5	0.224	3.927	10.24	PSB	PSB
	11.6	4.5	0.25	3.875	11.36	PSLB	PLB	PLB	PLB	PLB	P	PLB
	13.5	4.5	0.29	3.795	13.05		PLB	PLB	PLB	PLB	P	PLB
	15.1	4.5	0.337	3.701	15							PLB	PLB
5	11.5	5	0.22	4.435	11.24	PS	PS
	13	5	0.253	4.369	12.84	PSLB	PSLB
	15	5	0.296	4.283	14.88	PSLB	PLB	PLB	PLB	PLB	P	PLB
	18	5	0.362	4.151	17.95		PLB	PLB	PLB	PLB	P	PLB	PLB
	21.4	5	0.437	4.001	21.32		PLB	PLB	PLB	PLB	P	PLB	PLB
	23.2	5	0.478	3.919	23.11			PLB	PLB	PLB	P	PLB	PLB
	24.1	5	0.5	3.875	24.05			PLB	PLB	PLB	P	PLB	PLB
5.5	14	5.5	0.224	4.887	13.71	PS	PS
	15.5	5.5	0.275	4.825	15.36	PSLB	PSLB
	17	5.5	0.304	4.767	16.89	PSLB	PLB	PLB	PLB	PLB	P	PLB
	20	5.5	0.361	4.653	19.83		PLB	PLB	PLB	PLB	P	PLB
	23	5.5	0.415	4.545	22.56		PLB	PLB	PLB	PLB	P	PLB	PLB
	26.8	5.5	0.5	4.375	26.72					P	P
	29.7	5.5	0.562	4.251	29.67					P	P
6.625	20	6.625	0.228	5.924	19.51	PSLB	PSLB
	24	6.625	0.352	5.796	23.6	PSLB	PLB	PLB	PLB	PLB	P	PLB
	28	6.625	0.417	5.666	27.67		PLB	PLB	PLB	PLB	P	PLB
	32	6.625	0.475	5.55	31.23			PLB	PLB	PLB	P	PLB	PLB
7	17	7	0.231	6.413	16.72
	20	7	0.272	6.331	19.56	PS	PS
	23	7	0.317	6.241	22.65	PSLB	PLB	PLB	PLB	PLB	P
	26	7	0.362	6.151	25.69	PSLB	PLB	PLB	PLB	PLB	P	PLB
	29	7	0.408	6.059	28.75		PLB	PLB	PLB	PLB	P	PLB
	32	7	0.453	5.969	31.7		PLB	PLB	PLB	PLB	P	PLB
	35	7	0.498	5.879	34.61			PLB	PLB	PLB	P	PLB	PLB
	38	7	0.54	5.795	37.29			PLB	PLB	PLB	P	PLB	PLB
7.625	24	7.625	0.3	6.9	23.49
	26.2	7.625	0.328	6.844	25.59	PSLB	PSLB	PLB	PLB	PLB	P
	29.7	7.625	0.375	6.75	29.06		PLB	PLB	PLB	PLB	P	PLB
	33.7	7.625	0.43	6.64	33.07		PLB	PLB	PLB	PLB	P	PLB
	39	7.625	0.5	6.5	38.08			PLB	PLB	PLB	P	PLB	PLB
	42.8	7.625	0.562	6.376	42.43			PLB	PLB	PLB	P	PLB	PLB
	45.3	7.625	0.595	6.31	44.71			PLB	PLB	PLB	P	PLB	PLB
7.75	46.1	7.75	0.595	6.435	45.51			P	P	P	P	P	P

Spec (in)	Weight (b/f)	Outside Diameter (in)	Wall Thickness (in)	Drift Diameter (in)	Plain End Wpe (Ib/ft)	Type of Pipe End-finish
Spec (in)	Weight (b/f)	Outside Diameter (in)	Wall Thickness (in)	Drift Diameter (in)	Plain End Wpe (Ib/ft)	J55/K55	M65	L80/R95	N80	C90/T95	C110	P110	Q125
8.625	24	8.625	0.264	7.972	23.60	PS	PS
	28	8.625	0.304	7.892	27.04		PS
	32	8.625	0.352	7.796	31.13	PSLB	PSLB
	36	8.625	0.4	7.7	35.17	PSLB	PSLB	PLB	PLB	PLB	P
	40	8.625	0.45	7.6	39.33		PLB	PLB	PLB	PLB	P	PLB
	44	8.625	0.5	7.5	43.43			PLB	PLB	PLB	P	PLB
	49	8.625	0.557	7.286	48.04			PLB	PLB	PLB	P	PLB	PLB
9.625	32.3	9.625	0.312	8.845	31.06
	36	9.625	0.352	8.765	34.89	PSLB	PSLB
	40	9.625	0.395	8.679	38.97	PSLB	PSLB	PLB	PLB	PLB	P
	43.5	9.625	0.435	8.599	42.37		PLB	PLB	PLB	PLB	P	PLB
	47	9.625	0.472	8.525	46.18		PLB	PLB	PLB	PLB	P	PLB	PLB
	53.5	9.625	0.545	8.379	52.90			PLB	PLB	PLB	P	PLB	PLB
	58.4	9.625	0.595	8.279	57.44			PLB	PLB	PLB	P	PLB	PLB
10.75	32.75	10.75	0.279	10.036	31.23
	40.5	10.75	0.35	9.894	38.91	PSB	PSB
	45.5	10.75	0.4	9.794	44.26	PSB	PSB
	51	10.75	0.45	9.694	49.55	PSB	PSB	PSB	PSB	PSB	P	PSB
	55.5	10.75	0.495	9.604	54.26		PSB	PSB	PSB	PSB	P	PSB
	60.7	10.75	0.545	9.504	59.46					PSB	P	PSB	PSB
	65.7	10.75	0.595	9.404	64.59					PSB	P	PSB	PSB
11.75	42	11.75	0.333	10.928	40.64
	47	11.75	0.375	10.844	45.60	PSB	PSB
	54	11.75	0.435	10.724	52.62	PSB	PSB
	60	11.75	0.489	10.616	58.87	PSB	PSB	PSB	PSB	PSB	P	PSB	PSB
	65	11.75	0.534	10.526	64.03			P	P	P	P	P	P
	71	11.75	0.582	10.43	69.48			P	P	P	P	P	P
13.375	48	13.375	0.33	12.559	46.02
	54.5	13.375	0.38	12.459	52.79	PSB	PSB
	61	13.375	0.43	12.359	59.50	PSB	PSB
	68	13.375	0.48	12.259	66.17	PSB	PSB	PSB	PSB	PSB	P	PSB
	72	13.375	0.514	12.191	70.67			PSB	PSB	PSB	P	PSB	PSB
16	65	16	0.375	15.062	62.64
	75	16	0.438	14.936	72.86	PSB	PSB
	84	16	0.495	14.822	82.05	PSB	PSB
	109	16	0.656	14.5	107.6	P		P	P			P	P
18.625	87.5	18.625	0.435	17.567	84.59	PSB	PSB
20	94	20	0.438	18.936	91.59	PSLB	PSLB
	106.5	20	0.5	18.812	104.23	PSLB	PSLB
	133	20	0.635	18.542	131.45	PSLB

Lables					Nominal Linear Masses			Thickness (in)	Type Of End-Finish
1	2			O.D. (in)	Non-upset T&C (Ib/ft)	Ext.upset T&C (lb/t)	Integ- Joint (lb/f)		H40	J55	L80/R95	N80 Type1.Q	C90	T95	P110
1	NU T&C	EU T&C	IJ	O.D. (in)	Non-upset T&C (Ib/ft)	Ext.upset T&C (lb/t)	Integ- Joint (lb/f)		H40	J55	L80/R95	N80 Type1.Q	C90	T95	P110
1	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16
1.05	1.14	1.2		1.050	1.14	1.2		0.113	PNU	PNU	PNU	PNU	PNU	PNU
1.05	1.48	1.54		1.050	1.48	1.54		0.154	PU	PU	PU	PU	PU	PU	PU
1.315	1.7	1.80	1.72	1.315	1.7	1.80	1.72	0.133	PNUI	PNUI	PNUI	PNUI	PNUI	PNUI
1.315	2.19	2.24		1.315	2.19	2.24		0.179	PU	PU	PU	PU	PU	PU	PU
1.66	2.09		2.10	1.66			2.10	0.125	PI	PI	PI	PI	PI	PI	PI
	2.3	2.4	2.33	1.66	2.3	2.4	2.33	0.14	PNUI	PNUI	PNUI	PNUI	PNUI	PNUI	PNUI
	3.03	3.07		1.66	3.03	3.07		0.191	PU	PU	PU	PU	PU	PU	PU
1.9	2.4		2.40	1.9			2.40	0.125	PI	PI	PI	PI	PI	PI	PI
	2.75	2.9	2.76	1.9	2.75	2.9	2.76	0.145	PNUI	PNUI	PNUI	PNUI	PNUI	PNUI	PNUI
	3.65	3.73		1.9	3.65	3.73		0.2	PU	PU	PU	PU	PU	PU	PU
	4.42			1.9	4.42			0.25
	5.15			1.9	5.15			0.3
2.063	3.24		3.25	2.063			3.25	0.156	PI	PI	PI	PI	PI	PI	PI
2.063	4.50			2.063				0.225	P	P	P	P	P	P	P
2-3/8	4			2.375	4			0.167	PN	PN	PN	PN	PN	PN
	4.6	4.7		2.375	4.6	4.7		0.19	PNU	PNU	PNU	PNU	PNU	PNU	PNU
	5.8	5.95		2.375	5.8	5.95		0.254			PNU	PNU	PNU	PNU	PNU
	6.6			2.375	6.6			0.295			P		P	P
	7.35	7.45		2.375	7.35	7.45		0.336			PU		PU	PU
2-7/8	6.4	6.5		2.875	6.4	6.5		0.217	PNU	PNU	PNU	PNU	PNU	PNU	PNU
	7.8	7.9		2.875	7.8	7.9		0.276			PNU	PNU	PNU	PNU	PNU
	8.6	8.7		2.875	8.6	8.7		0.308			PNU	PNU	PNU	PNU	PNU
	9.35	9.45		2.875	9.35	9.45		0.34			PU		PU	PU
	10.5			2.875	10.5			0.392			P		P	P
	11.5			2.875	11.5			0.44			P		P	P
3-1/2	7.7			3.5	7.7			0.216	PN	PN	PN	PN	PN	PN
	9.2	9.3		3.5	9.2	9.3		0.254	PNU	PNU	PNU	PNU	PNU	PNU	PNU
	10.2			3.5	10.2			0.289	PN	PN	PN	PN	PN	PN
	12.7	12.95		3.5	12.7	12.95		0.375			PNU	PNU	PNU	PNU	PNU
	14.3			3.5	14.3			0.43			P		P	P
	15.5			3.5	15.5			0.476			P		P	P
	17			3.5	17			0.53			P		P	P
4-1/2	9.5			4	9.5			0.226	PN	PN	PN	PN	PN	PN
	10.7	11		4		11		0.262	PU	PU	PU	PU	PU	PU
	13.2			4	13.2			0.33			P		P	P
	16.1			4	16.1			0.415			P		P	P
	18.9			4	18.9			0.5			P		P	P
	22.2			4	22.2			0.61			P		P	P
	12.6	12.75		4.5	12.6	12.75		0.271	PNU	PNU	PNU	PNU	PNU	PNU
	15.2			4.5	15.2			0.337			P		P	P
	17			4.5	17			0.38			P		P	P
	18.9			4.5	18.9			0.43			P		P	P
	21.5			4.5	21.5			0.5			P		P	P
	23.7			4.5	23.7			0.56			P		P	P
	26.1			4.5	26.1			0.63			P		P	P

Magnetic Detector

MPT is used to identify surface cracks or defects in ferromagnetic materials by applying a magnetic field and using magnetic particles.

Hydrostatic Test

A hydrostatic test is a common method used to assess the strength and integrity of seamless steel pipes. This test involves filling the pipe with water and pressurizing it to a specified level to check for any leaks or structural weaknesses.

Ultrasonic Detector

UT equipment is used to detect internal and external defects in casing and tubing pipes by sending ultrasonic waves through the material.

Eddy Current Test

ECT is used to identify surface and near-surface defects on casing and tubing in conductive materials by inducing eddy currents and detecting changes in their flow.

Metallographical Microscope

A specific requirements related to the analysis of steel microstructures.

Impact Tester

The Charpy impact test is a common method used to evaluate the impact toughness of steel pipes materials. The test involves striking a notched specimen with a swinging pendulum, and the energy absorbed by the material during fracture is measured.

Brinell Hardness Tester

Hardness testing measures the hardness of the material, which is important for assessing its resistance to deformation and wear.

Tensile Test Machine

This equipment is used to determine the tensile strength, yield strength, and elongation properties of casing and tubing pipes by subjecting them to axial tension.

Thread Projector

The primary function of a thread projector is to inspect and measure the geometry of threads on casings and tubings. This includes the pitch, flank angles, crests, roots, and other thread parameters.

Casing &Tubing