API 5L X65 PSL 2 Line Pipes
API 5L X65 PSL2 Line Pipes are high-strength carbon steel pipes manufactured according to the API Spec 5L standard. They are primarily used in the petroleum and natural gas industries for long-distance, high-pressure fluid transportation. "X65" signifies a minimum yield strength of 65,000 psi (450 MPa), while the "PSL2" designation represents a more stringent product specification level.
This includes mandatory notch toughness testing and stricter limits on chemical composition (such as carbon equivalent) to ensure superior weldability and safety in harsh environments like high-pressure transmission, subsea pipelines, or sour service.
Strict compliance with PSL2 impact standards. Click here to request a sample MTR for our latest X65 PSL2 batch.
API 5L X65 PSL2 Line Pipes Specifications
| Item | Description |
| Standard | API Spec 5L (46th Ed. or later) / ISO 3183 |
| Grade | X65 or L450 |
| Product Specification Level | PSL2 (Mandatory Impact Test) |
| Outer Diameter (OD) | 0.405" – 80" (10.3mm – 2032mm) |
| Manufacturing Type | Seamless (SMLS), LSAW, SSAW, ERW |
| Length | Single Random (SRL), Double Random (DRL), or Fixed Length |
| End Finish | Beveled End (BE), Plain End (PE), Threaded |
| Coating | 3LPE, 3LPP, FBE, Internal Epoxy Lining |
Chemical Composition and Mechanical Properties
Chemical Composition (Max % for PSL2)
Note: PSL2 enforces strict Carbon Equivalent (CE) limits to ensure excellent field weldability.
| Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) | Silicon (Si) | Others (V/Nb/Ti) |
| X65 PSL2 SMLS | 0.24 | 1.60 | 0.025 | 0.015 | 0.45 | Sum ≤ 0.15 |
| X65 PSL2 Welded | 0.22 | 1.45 | 0.025 | 0.015 | 0.45 | Sum ≤ 0.15 |
Mechanical Properties
| Property | Value (Grade X65 / L450) |
| Yield Strength | 450 - 600 MPa (65,300 - 87,000 psi) |
| Tensile Strength | 535 - 760 MPa (77,600 - 110,200 psi) |
| Yield to Tensile Ratio | ≤ 0.93 (Maximum) |
| Elongation | Based on cross-sectional area (Calculated per formula) |
| Impact Energy (Charpy) | Mandatory testing at 0°C (Requirement for PSL2) |
API 5L X65 PSL2 Equivalent Grades
| Standard | Equivalent Grade |
| ISO 3183 | L450 |
| GB/T 9711 (China) | L450 |
| EN 10208-2 (Europe) | L450NB / L450QB |
| CSA Z245.1 (Canada) | Grade 448 |
| ASTM | No Direct Match (High-strength grades are usually only produced to API) |
API 5L X65 PSL2 Pipe Wall Thickness Table (mm)
Note: The following shows thicknesses for common NPS sizes per ASME B36.10M.
| NPS | OD (mm) | SCH 40 | SCH 80 | SCH 120 | SCH 160 |
| 4" | 114.3 | 6.02 | 8.56 | 11.13 | 13.49 |
| 8" | 219.1 | 8.18 | 12.70 | 18.26 | 23.01 |
| 12" | 323.8 | 10.31 | 17.48 | 25.40 | 33.32 |
| 18" | 457.0 | 14.27 | 23.83 | 34.93 | 45.24 |
| 24" | 610.0 | 17.48 | 30.96 | 46.02 | 59.54 |
Delivery Condition for API 5L X65 PSL2 Line Pipe
The delivery condition determines the microstructure and final performance of the pipe. Suffix codes for PSL2 pipes indicate the heat treatment process:
| Suffix Code | Delivery Condition | Process Description |
| R | As Rolled | Final steel pipe is in the as-rolled state (not recommended for X65 PSL2). |
| N | Normalized | Normalized or normalizing rolled to achieve uniform grain size. |
| Q | Quenched & Tempered | Heated, quenched, and then tempered for a balance of strength and toughness (Common for SMLS). |
| M | Thermomechanical Rolled | TMCP (Thermomechanical Control Process) used to achieve properties via rolling (Common for Welded). |
API 5L X65 PSL2 Pipeline factory
API 5L X65 PSL2 oil and gas pipelines Test Equipments
API 5L X65 PSL2 seamless line pipes Certificate
FAQ
What is the yield strength of API 5L X65 PSL2
The yield strength of API 5L X65 PSL2 is defined as a specific range, rather than just a minimum value. Because it is a PSL2 (Product Specification Level 2) pipe, the standard enforces both a minimum and a maximum limit to ensure the material is neither too weak nor too brittle.
What is the difference between API 5L Grade X65 PSL1, PSL2 and sour service pipe
While all three pipes share the same minimum yield strength of 65,000 psi (X65), they differ significantly in terms of their quality standards, testing requirements, and the environments they can handle.
| Feature | X65 PSL1 | X65 PSL2 | X65 Sour Service |
| Minimum Yield | 65,000 psi | 65,000 psi | 65,000 psi |
| Maximum Yield | Not Specified | 87,000 psi | 87,000 psi |
| Impact Testing | Not Required | Mandatory | Mandatory |
| Body Repair Weld | Allowed | Prohibited | Prohibited |
| Traceability | Basic | Full | Full |
| Corrosion Testing | None | None | HIC & SSC Mandatory |
| Sulfur Content | Standard | Low | Ultra-Low (<0.002%) |
| Environment | Standard (Sweet) | High Pressure / Cold | Sour (
H2SH2S ) / Corrosive |
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