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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.
Before quoting API 5L line pipe, buyers usually need to lock down the pipe type, grade, PSL level, end finish, coating requirement and inspection documents, because small specification gaps can change both approval time and final cost.
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).
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).
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.
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.
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.
· API 5L Line Pipe Selection Guide for Oil and Gas Projects
· API Spec 5L 47th Edition: Key Updates Compared With the 46th Edition
· API 5L Grade B vs X42 vs X52: Which Line Pipe Grade Fits Your Project?
· API 5L PSL1 vs PSL2 for Oil and Gas Pipeline Projects
· Sour Service Steel Pipe: What H2S Environments Actually Require
Before quotation, confirm the grade and PSL together with the service condition. A grade name alone does not define toughness, NDT, documentation or supplementary test requirements.
| Decision | Buyer question | Evidence to request |
|---|---|---|
| Grade B / X42 / X52 | Does the line class and design basis permit this grade? | Chemical and mechanical results linked to the heat number |
| X60 / X65 / X70 | Is the higher strength compatible with weldability, toughness and the project procedure? | Approved grade, heat-treatment route and project acceptance records |
| PSL1 or PSL2 | Does the project require tighter chemistry, toughness, NDT or documentation? | PO clause, applicable API 5L edition and approved inspection/test plan |
| Sour, offshore, low-temperature or CO2 service | Are supplementary service requirements triggered? | Service conditions and CVN, HIC, SSC or other supplementary tests when specified |
Grade availability is subject to diameter, wall thickness, PSL, delivery condition and mill capability. The purchase order and applicable standard edition control the final supply.
RFQ fields: standard and edition, PSL, grade, OD, WT or schedule, quantity, length, ends/bevel, coating, service medium and temperature, test scope, inspection hold points, documentation, marking and packing.
| 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 |
| 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 |
| 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 | |
| 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 |
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.
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.
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.
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.
