ALLLAND Boiler Steel Pipe Supply

OCTG Casing Pipe

Welcome to ALLLAND Steel Pipe Manufacturing. Our OCTG casing pipes are manufactured with advanced techniques, offering exceptional pressure resistance and suitability for deep wells and high-pressure applications. Each pipe undergoes rigorous chemical analysis, mechanical testing, and hydrostatic pressure testing to withstand demanding drilling environments. Compliant with API 5CT standards, our pipes deliver consistent chemical and mechanical properties, ensuring every unit meets industry specifications.

Alllandsteel is a steel pipe manufacturer based in China with 25 years of experience. The facility spans 22,000 square meters, represents a RMB 700 million investment, and operates four production lines (JCOE, ERW, SMLS, SSAW) alongside five coating lines. With an annual production capacity of 250,000 tons, the factory covers specifications ranging from Ø406 to Ø1524 and holds multiple international certifications (API/ASTM/EN/ISO/JIS). Focused on steel pipes, creating value for you!

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Octg Casing Pipe is a type of pipeline used in petroleum transportation and extraction. Its primary functions include supporting wellbore walls, isolating formations from the pipeline, and preventing wellbore collapse. Octg Casing Pipe is a hollow pipe typically connected via threaded joints and manufactured from high-strength carbon steel. Acting as a protective shell, it isolates soft formations and soil, ensuring smooth oil and gas extraction.

As a critical pipeline component in oil and gas extraction, what standards and requirements apply to OCTG Casing Pipe? Below, ALLLAND Steel Pipe Manufacturer will outline specifications covering production dimensions, manufacturing processes, standards, and tolerances.

Octg Casing Pipe Specifications

O.D.:

4 1/2“ – 20” (114.3 mm – 508.0 mm), commonly 5“, 5 1/2”, 7“, 9 5/8”, 13 3/8″.

W.T.:

0.25“ ~ 1.5” , with increased thickness available based on application requirements.

Standards:

API 5CT

Grades:

H40/J55/K55/N80/L80/P110/Q125

Process:

Seamless process; welded pipes used only for lower grades or large-diameter conduits.

Pipe Ends:

Plain End, Threaded & Coupled

Material: :

Carbon steel, alloy steel

Surface Finish:

Black paint, oiled, end caps

Octg Casing Pipe manufactured by ALLLAND

Allland OCTG casing pipe production employs rigorous heat treatment to ensure stable mechanical properties and extended service life.

Mastery of seamless manufacturing processes yields pipes with superior pressure resistance, making them ideal for deep and high-pressure wells.

The factory operates its own testing laboratory, subjecting every pipe to chemical analysis, mechanical testing, hydrostatic pressure testing, and more.

The factory supports post-production machining, utilizing CNC machines for end-processing and threading, delivering superior sealing performance.

Octg Casing Pipe Size

The following data complies with API 5CT standards, with customizable lengths.

Weight is calculated based on Weight (kg/m): Outer Diameter × Wall Thickness × Steel Density, where the referenced steel density is 7.85 g/cm³.

Nominal Size (inch)	OD (mm)	Wall Thickness (WT, mm)	Length (m)	Grade / Steel Type	API Spec	Thread Type	Weight (kg/m)
2 7/8″	73.0	5.49	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	12.7
2 7/8″	73.0	6.02	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	14.2
2 7/8″	73.0	7.11	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	16.8
3 1/2″	88.9	6.02	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	18.0
3 1/2″	88.9	7.11	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	21.2
3 1/2″	88.9	8.18	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	24.3
4 1/2″	114.3	6.02	9.5 / 12.2	J55, K55, N80	API 5CT	BTC / LTC	19.0
4 1/2″	114.3	8.56	9.5 / 12.2	J55, K55, N80	API 5CT	BTC / LTC	26.8
4 1/2″	114.3	9.53	9.5 / 12.2	J55, K55, N80	API 5CT	BTC / LTC	29.8
5 1/2″	139.7	6.02	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	22.8
5 1/2″	139.7	7.62	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	28.5
5 1/2″	139.7	8.74	9.5 / 12.2	J55, K55, N80, L80	API 5CT	BTC / LTC	32.6
7″	177.8	8.18	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC / LTC	34.1
7″	177.8	9.53	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC / LTC	39.7
7″	177.8	11.13	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC / LTC	46.3
9 5/8″	244.5	9.53	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC / LTC	71.0
9 5/8″	244.5	12.7	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC / LTC	92.5
9 5/8″	244.5	14.3	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC / LTC	104.0
13 3/8″	340	12.7	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC	127.0
13 3/8″	340	15.09	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC	150.0
13 3/8″	340	17.48	9.5 / 12.2	J55, K55, N80, L80, P110	API 5CT	BTC	173.0
16″	406.4	15.09	9.5 / 12.2	K55, N80, L80, P110	API 5CT	BTC	180.0
16″	406.4	19.05	9.5 / 12.2	K55, N80, L80, P110	API 5CT	BTC	225.0
16″	406.4	22.23	9.5 / 12.2	K55, N80, L80, P110	API 5CT	BTC	262.0
20″	508	22.23	9.5 / 12.2	N80, L80, P110	API 5CT	BTC	320.0
20″	508	25.4	9.5 / 12.2	N80, L80, P110	API 5CT	BTC	365.0
20″	508	28.58	9.5 / 12.2	N80, L80, P110	API 5CT	BTC	410.0

Octg Casing Pipe Performance and Standard

Octg Casing Pipe Chemical Properties

Chemical properties encompass carbon steel and alloy steel. Given that oil and gas extraction environments often involve acidic formations and corrosive gases, the corrosion resistance of Octg Casing Pipe determines the pipeline system’s lifespan. Below are our company’s chemical property standards for pipeline production, strictly adhering to API 5CT specifications.

Steel Grade	C (%)	Mn (%)	P (%)	S (%)	Cr (%)	Mo (%)	Ni (%)
J55	≤0.23	0.85–1.20	≤0.035	≤0.035	–	–	–
K55	≤0.23	0.85–1.20	≤0.035	≤0.035	–	–	–
N80	≤0.30	0.85–1.20	≤0.035	≤0.035	0.50–1.00	0.15–0.30	–
L80	≤0.30	0.85–1.20	≤0.035	≤0.035	0.50–1.00	0.15–0.30	–
P110	0.30–0.35	0.85–1.20	≤0.035	≤0.035	0.50–1.00	0.15–0.30	–

Octg Casing Pipe Mechanical Properties

Strength is the core metric for OCTG Casing Pipe. This data guides the selection of pipe steel grades, ensuring the pipe remains deformation-free under high-temperature and high-pressure conditions for long-term stable operation.

Steel Grade	Yield Strength (MPa)	Tensile Strength (MPa)	Elongation (%)	Charpy Impact (J @ 20°C)
J55	379	490–621	≥ 20	27
K55	379	490–621	≥ 20	27
N80	552	621–758	≥ 17	27
L80	552–620	690–758	≥ 17	27
P110	758	827–965	12–15	27

Yield Strength: Represents the maximum force a pipe can withstand without deformation.

Tensile Strength: The maximum tensile force a pipe can endure.

Impact Toughness: Low-temperature impact resistance at 20°C.

Elongation: Measures the material’s ductility, strictly conforming to standards.

Octg Casing Pipe Tolerances

Outer Diameter Tolerance:

±0.25 mm to ±0.76 mm

Wall Thickness Tolerance:

±5% or ±0.25 to ±0.76 mm

Length Tolerance:

±50 mm

Application Scenarios for OCTG Casing Pipe

Application	Purpose	Recommended Steel Grades	Well Depth / Pressure Environment
Oil Well Casing	Supports the wellbore, prevents collapse and wall loosening	J55 / K55 / N80 / L80 / P110	Shallow / Medium Pressure Wells
Gas Well Casing	Isolates formations, prevents gas leakage	J55 / K55 / N80 / L80	Shallow / Medium-Deep / High Pressure Wells
High Pressure High Temperature (HPHT) Well	Withstands complex formation pressure and high temperatures	L80 / P110	Medium-Deep / High Pressure High Temperature Wells
Deepwater / Offshore Well	Reinforces and protects the wellbore in offshore drilling	N80 / L80 / P110	Medium-Deep / Offshore Deepwater Wells
Sour Well (H2S Environment)	Prevents hydrogen-induced cracking and well leakage	L80 / P110	High Corrosion Wells / H2S Wells
Geothermal / Special Wells	Geothermal or wells in acidic or high-abrasion formations	L80 / P110	High Temperature / Acidic / High Abrasion Wells