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API 5L Seamless Line Pipe

API 5L Grade B and X52 seamless line pipe for high pressure gas transmission

High strength API 5L X65 PSL2 seamless steel pipe for offshore pipelines

Tubería de línea sin costura API 5L X42 X52 PSL1 para petróleo y gas

Anti-corrosive seamless line pipe with internal coating for oilfield service

Product Name: API 5L Seamless Line Pipe, SMLS Line Pipe
Outer Diameter: 10.3 mm - 914.4 mm
Wall Thickness: 1.65 mm - 60 mm
Length: 5.8 m, 6 m, 11.8 m, 12 m or custom length
Surface: bare, oiled, black varnish, painted or coated upon request
Ends: Plain end, beveled end, with pipe caps
Standards and Grades: API 5L Grade B, X42, X52, X60, X65, X70; ASTM A106 Grade B; ASTM A53 Grade A/B; DIN 17175; EN 10216-2; DIN 2391; EN 10305-1; EN 10210 S235JR, S275JR, S355JR
Packing: Bundled or in bulk
Applications: Oil, gas, water and fluid transmission pipelines

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Overview
Specification
Standard
Process
FAQ

API 5L Seamless Line Pipe for Oil, Gas and Fluid Transmission

API 5L seamless line pipe is commonly specified for oil, gas, water and fluid transmission projects where seamless construction, project approval requirements and pressure service conditions are important.

1. Technical Specifications

Outside Diameter (OD):10.3 mm – 914.4 mm (1/8" to 36")

Wall Thickness (WT):1.65 mm – 60 mm (SCH 10 to SCH XXS)

Length:Single Random (SRL), Double Random (DRL), or Fixed Lengths (up to 12m or 18m).

Manufacturing Process:Hot Finished Seamless (HFS) and Cold Drawn Seamless (CDS).

2. Industry Standards & Material Grades

We provide line pipes that strictly adhere to international quality benchmarks, supplied with full MTC (Material Test Certificates).

API 5L (PSL1 & PSL2):Grade B, X42, X46, X52, X56, X60, X65, X70, X80.

ASTM A106: Grade B, Grade C (High-Temperature Service).

ASTM A53: Grade B.

DIN/EN Standards:EN 10208-1/2 (L245, L290, L360).

3. Key Applications

Oil & Gas Midstream:Onshore and offshore transmission pipelines for crude oil and natural gas.

Refinery & Petrochemical:High-pressure fluid transport within processing plants.

Infrastructure:High-pressure water mains and geothermal piping systems.

Extreme Environments:Specialized "Sour Service" grades for H2S-containing environments and low-temperature service.

4. Surface Protection & Packaging

To ensure zero-defect delivery and long-term corrosion resistance:

Coating Options: 3PE (Three-Layer Polyethylene), FBE (Fusion Bonded Epoxy), Black Vanish, or Galvanized coating.

End Treatment:Beveled ends (30°±5°) for easy welding, or plain ends with plastic caps.

Export Packing:Hexagonal bundles with steel strips, marking/stencil according to project requirements, and sea-worthy packaging for container or bulk shipment.

5. Quality Assurance

Every pipe undergoes rigorous non-destructive testing (NDT), including:

Hydrostatic Testing to verify pressure containment.

Ultrasonic (UT) & Eddy Current Testing for internal flaw detection.

Chemical & Mechanical Analysis to ensure exact grade compliance.

Seamless Steel Pipe Specifications Up To 36

Outer Diameter (OD)	Wall Thickness (WT) Range	Length Range	Common Schedule / Standards
1/2" (21.3 mm)	2.11 mm – 7.47 mm	5.8m – 12.0m	SCH 40, 80, 160, XXS
1" (33.4 mm)	2.77 mm – 9.09 mm	5.8m – 12.0m	ASTM A106 / API 5L
2" (60.3 mm)	2.77 mm – 11.07 mm	5.8m – 12.0m	SCH 40, 80, 160, XXS
4" (114.3 mm)	3.18 mm – 17.12 mm	5.8m – 12.0m	Standard Line Pipe
6" (168.3 mm)	3.40 mm – 21.95 mm	5.8m – 12.0m	SCH 40, 80, 120, 160
8" (219.1 mm)	3.76 mm – 23.01 mm	5.8m – 12.0m	Oil & Gas Conveyance
10" (273.1 mm)	4.19 mm – 28.58 mm	5.8m – 12.0m	SCH 40, 60, 80, 100
12" (323.9 mm)	4.57 mm – 33.32 mm	5.8m – 12.0m	Power Plant Piping
14" (355.6 mm)	6.35 mm – 35.71 mm	5.8m – 12.0m	ASTM A333 (Low Temp)
16" (406.4 mm)	6.35 mm – 40.49 mm	5.8m – 12.0m	High Temp Service
20" (508.0 mm)	6.35 mm – 50.01 mm	5.8m – 12.0m	Heavy Wall Thickness
24" (609.6 mm)	6.35 mm – 59.54 mm	5.8m – 12.0m	Standard Max Pierced OD
28" (711.2 mm)	7.92 mm – 60.00 mm	5.8m – 12.0m	Hot Expanded SMLS
32" (812.8 mm)	9.53 mm – 60.00 mm	5.8m – 12.0m	Critical Pressure Vessels
36" (914.4 mm)	9.53 mm – 60.00 mm	5.8m – 12.0m	Large Diameter Seamless

Steel Pipe Mechanical and Chemical Properties

	Chemical Components (%)					Mechanical Properties			Impact Test
Standard / Grade	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Tensile (MPa)	Yield (MPa)	Elong. (%)	Impact Temp	Impact Energy (J)
ASTM A106 Gr.B	0.3	0.1	0.29-1.06	0.035	0.035	415	240	30	N/A	N/A
ASTM A106 Gr.C	0.35	0.1	0.29-1.06	0.035	0.035	485	275	30	N/A	N/A
API 5L B (PSL1)	0.28	---	1.2	0.03	0.03	415	245	23	N/A	N/A
API 5L X42 (PSL1)	0.28	---	1.3	0.03	0.03	415	290	23	N/A	N/A
API 5L X46 (PSL1)	0.28	---	1.4	0.03	0.03	435	320	22	N/A	N/A
API 5L X52 (PSL1)	0.28	---	1.4	0.03	0.03	460	360	21	N/A	N/A
API 5L X56 (PSL1)	0.28	---	1.4	0.03	0.03	490	390	19	N/A	N/A
API 5L X60 (PSL1)	0.28	---	1.4	0.03	0.03	520	415	19	N/A	N/A
API 5L X65 (PSL1)	0.28	---	1.45	0.03	0.03	535	450	18	N/A	N/A
API 5L Gr.B (PSL2)	0.24	0.4	1.2	0.025	0.015	415	245-450	23	0 °C	27 J
API 5L X42 (PSL2)	0.24	0.4	1.3	0.025	0.015	415	290-496	23	0 °C	27 J
API 5L X52 (PSL2)	0.24	0.45	1.4	0.025	0.015	460	360-530	21	0 °C	27 J
API 5L X60 (PSL2)	0.24	0.45	1.4	0.025	0.015	520	415-565	19	0 °C	27 J
API 5L X65 (PSL2)	0.24	0.45	1.45	0.025	0.015	535	450-600	18	0 °C	27 J
ASTM A333 Gr.1	0.3	---	0.40-1.06	0.025	0.025	380	205	35	-45 °C	18 J
ASTM A333 Gr.3	0.19	0.18-0.37	0.31-0.64	0.025	0.025	450	240	30	-100 °C	18 J
ASTM A333 Gr.6	0.3	0.10 min	0.29-1.06	0.025	0.025	415	240	30	-45 °C	18 J
EN 10210 S235JR	0.17	---	1.4	0.035	0.035	360-510	235	26	20 °C	27 J
EN 10210 S235J0H	0.17	---	1.4	0.03	0.03	360-510	235	26	0 °C	27 J
EN 10210 S235J2H	0.17	---	1.4	0.025	0.025	360-510	235	26	-20 °C	27 J
EN 10210 S275JR	0.21	---	1.5	0.035	0.035	410-560	275	23	20 °C	27 J
EN 10210 S275J0H	0.21	---	1.5	0.03	0.03	410-560	275	23	0 °C	27 J
EN 10210 S275J2H	0.21	---	1.5	0.025	0.025	410-560	275	23	-20 °C	27 J
EN 10210 S355JR	0.22	0.55	1.6	0.035	0.035	470-630	355	22	20 °C	27 J
EN 10210 S355J0H	0.22	0.55	1.6	0.03	0.03	470-630	355	22	0 °C	27 J
EN 10210 S355J2H	0.22	0.55	1.6	0.025	0.025	470-630	355	22	-20 °C	27 J

Dimensional Tolerances for API 5L and Related Seamless Pipe Standards

Standard	Feature	Dimension Range	Tolerance (Permissible Variation)
ASTM A106 / A53	Outside Diameter	1/8" to 1-1/2" (DN6-40)	±0.40 mm
		2" to 4" (DN50-100)	±0.80 mm
		5" to 8" (DN125-200)	+1.60 mm / -0.80 mm
		> 8" (DN200)	+1.6% OD / -0.8% OD
	Wall Thickness	All Sizes	-12.5% (No max limit specified)
	Length	Single Random (SRL)	4.8m – 6.7m (min 90% of load)
API 5L (PSL1/PSL2)	Outside Diameter	< 2-3/8" (60.3mm)	+0.41 mm / -0.80 mm
		2-3/8" to 24"	±0.75% OD
		> 24"	±1.0% OD
	Wall Thickness	≤ 4.0 mm	+0.6 mm / -0.5 mm
	Wall Thickness	4.0 mm to 25.0 mm	+15.0% / -12.5%
	Length	Custom/Standard	± 500 mm (or as per agreement)
EN 10210 / 10216	Outside Diameter	All Sizes	±1% (Min ±0.5 mm)
	Wall Thickness	All Sizes	±12.5% (Min ±0.4 mm)
	Straightness	Total Length	≤ 0.2% of total length

Hot-Rolled Seamless Steel Pipe Production Process

Frequently Asked Questions

1. When do buyers usually insist on seamless API 5L line pipe rather than welded line pipe?

They usually do so when the project puts extra weight on manufacturing route, pressure confidence, or end-user preference. The choice is often tied to approval and perceived risk as much as to technical need. Typical long-tail contexts include API 5L seamless line pipe for oil and gas transmission, PSL2 seamless pipe, and API 5L X52 or X65 seamless carbon steel line pipe.

2. Why do API 5L seamless line pipe quotes vary so much even within the same grade family?

Differences often come from PSL level, testing package, coating inclusion, document expectations, and whether the offer is routine supply or project-controlled supply. Buyers should treat those differences as meaningful, not cosmetic. This is very visible in quotes for API 5L PSL2 X52 seamless pipe where testing, coating, and document expectations drive the final commercial difference.

3. What is the most useful customer question when unsure about PSL1 versus PSL2?

A very useful question is whether the project specification truly calls for the tighter testing and traceability route, or whether buyers are defaulting to PSL2 without a clear approval need. That question is common in crude oil line projects, gas transmission pipelines, and high-spec export line pipe purchases.

4. What usually slows down approval of API 5L seamless pipe orders?

Approvals often slow on documents, testing alignment, coating scope, or because the project team has not settled whether seamless is mandatory. Those are common real-world delays. Approval delays often appear in API 5L seamless pipe orders for oil and gas transmission when PSL level and coating scope are still unsettled.

Seamless Steel Pipe Specifications Up To 36

Outer Diameter (OD)	Wall Thickness (WT) Range	Length Range	Common Schedule / Standards
1/2" (21.3 mm)	2.11 mm – 7.47 mm	5.8m – 12.0m	SCH 40, 80, 160, XXS
1" (33.4 mm)	2.77 mm – 9.09 mm	5.8m – 12.0m	ASTM A106 / API 5L
2" (60.3 mm)	2.77 mm – 11.07 mm	5.8m – 12.0m	SCH 40, 80, 160, XXS
4" (114.3 mm)	3.18 mm – 17.12 mm	5.8m – 12.0m	Standard Line Pipe
6" (168.3 mm)	3.40 mm – 21.95 mm	5.8m – 12.0m	SCH 40, 80, 120, 160
8" (219.1 mm)	3.76 mm – 23.01 mm	5.8m – 12.0m	Oil & Gas Conveyance
10" (273.1 mm)	4.19 mm – 28.58 mm	5.8m – 12.0m	SCH 40, 60, 80, 100
12" (323.9 mm)	4.57 mm – 33.32 mm	5.8m – 12.0m	Power Plant Piping
14" (355.6 mm)	6.35 mm – 35.71 mm	5.8m – 12.0m	ASTM A333 (Low Temp)
16" (406.4 mm)	6.35 mm – 40.49 mm	5.8m – 12.0m	High Temp Service
20" (508.0 mm)	6.35 mm – 50.01 mm	5.8m – 12.0m	Heavy Wall Thickness
24" (609.6 mm)	6.35 mm – 59.54 mm	5.8m – 12.0m	Standard Max Pierced OD
28" (711.2 mm)	7.92 mm – 60.00 mm	5.8m – 12.0m	Hot Expanded SMLS
32" (812.8 mm)	9.53 mm – 60.00 mm	5.8m – 12.0m	Critical Pressure Vessels
36" (914.4 mm)	9.53 mm – 60.00 mm	5.8m – 12.0m	Large Diameter Seamless

Steel Pipe Mechanical and Chemical Properties

	Chemical Components (%)					Mechanical Properties			Impact Test
Standard / Grade	C (%)	Si (%)	Mn (%)	P (%)	S (%)	Tensile (MPa)	Yield (MPa)	Elong. (%)	Impact Temp	Impact Energy (J)
ASTM A106 Gr.B	0.3	0.1	0.29-1.06	0.035	0.035	415	240	30	N/A	N/A
ASTM A106 Gr.C	0.35	0.1	0.29-1.06	0.035	0.035	485	275	30	N/A	N/A
API 5L B (PSL1)	0.28	---	1.2	0.03	0.03	415	245	23	N/A	N/A
API 5L X42 (PSL1)	0.28	---	1.3	0.03	0.03	415	290	23	N/A	N/A
API 5L X46 (PSL1)	0.28	---	1.4	0.03	0.03	435	320	22	N/A	N/A
API 5L X52 (PSL1)	0.28	---	1.4	0.03	0.03	460	360	21	N/A	N/A
API 5L X56 (PSL1)	0.28	---	1.4	0.03	0.03	490	390	19	N/A	N/A
API 5L X60 (PSL1)	0.28	---	1.4	0.03	0.03	520	415	19	N/A	N/A
API 5L X65 (PSL1)	0.28	---	1.45	0.03	0.03	535	450	18	N/A	N/A
API 5L Gr.B (PSL2)	0.24	0.4	1.2	0.025	0.015	415	245-450	23	0 °C	27 J
API 5L X42 (PSL2)	0.24	0.4	1.3	0.025	0.015	415	290-496	23	0 °C	27 J
API 5L X52 (PSL2)	0.24	0.45	1.4	0.025	0.015	460	360-530	21	0 °C	27 J
API 5L X60 (PSL2)	0.24	0.45	1.4	0.025	0.015	520	415-565	19	0 °C	27 J
API 5L X65 (PSL2)	0.24	0.45	1.45	0.025	0.015	535	450-600	18	0 °C	27 J
ASTM A333 Gr.1	0.3	---	0.40-1.06	0.025	0.025	380	205	35	-45 °C	18 J
ASTM A333 Gr.3	0.19	0.18-0.37	0.31-0.64	0.025	0.025	450	240	30	-100 °C	18 J
ASTM A333 Gr.6	0.3	0.10 min	0.29-1.06	0.025	0.025	415	240	30	-45 °C	18 J
EN 10210 S235JR	0.17	---	1.4	0.035	0.035	360-510	235	26	20 °C	27 J
EN 10210 S235J0H	0.17	---	1.4	0.03	0.03	360-510	235	26	0 °C	27 J
EN 10210 S235J2H	0.17	---	1.4	0.025	0.025	360-510	235	26	-20 °C	27 J
EN 10210 S275JR	0.21	---	1.5	0.035	0.035	410-560	275	23	20 °C	27 J
EN 10210 S275J0H	0.21	---	1.5	0.03	0.03	410-560	275	23	0 °C	27 J
EN 10210 S275J2H	0.21	---	1.5	0.025	0.025	410-560	275	23	-20 °C	27 J
EN 10210 S355JR	0.22	0.55	1.6	0.035	0.035	470-630	355	22	20 °C	27 J
EN 10210 S355J0H	0.22	0.55	1.6	0.03	0.03	470-630	355	22	0 °C	27 J
EN 10210 S355J2H	0.22	0.55	1.6	0.025	0.025	470-630	355	22	-20 °C	27 J

Dimensional Tolerances for API 5L and Related Seamless Pipe Standards

Standard	Feature	Dimension Range	Tolerance (Permissible Variation)
ASTM A106 / A53	Outside Diameter	1/8" to 1-1/2" (DN6-40)	±0.40 mm
		2" to 4" (DN50-100)	±0.80 mm
		5" to 8" (DN125-200)	+1.60 mm / -0.80 mm
		> 8" (DN200)	+1.6% OD / -0.8% OD
	Wall Thickness	All Sizes	-12.5% (No max limit specified)
	Length	Single Random (SRL)	4.8m – 6.7m (min 90% of load)
API 5L (PSL1/PSL2)	Outside Diameter	< 2-3/8" (60.3mm)	+0.41 mm / -0.80 mm
		2-3/8" to 24"	±0.75% OD
		> 24"	±1.0% OD
	Wall Thickness	≤ 4.0 mm	+0.6 mm / -0.5 mm
	Wall Thickness	4.0 mm to 25.0 mm	+15.0% / -12.5%
	Length	Custom/Standard	± 500 mm (or as per agreement)
EN 10210 / 10216	Outside Diameter	All Sizes	±1% (Min ±0.5 mm)
	Wall Thickness	All Sizes	±12.5% (Min ±0.4 mm)
	Straightness	Total Length	≤ 0.2% of total length

Hot-Rolled Seamless Steel Pipe Production Process

Frequently Asked Questions

1. When do buyers usually insist on seamless API 5L line pipe rather than welded line pipe?

2. Why do API 5L seamless line pipe quotes vary so much even within the same grade family?

3. What is the most useful customer question when unsure about PSL1 versus PSL2?

4. What usually slows down approval of API 5L seamless pipe orders?

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Tags : API 5L seamless line pipe , seamless line pipe , SMLS line pipe , API 5L pipe , X52 pipe , X60 pipe , X65 pipe

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