API 5L X80 Pipe
Ultra-High Yield API 5L X80 (L555) PSL2 Line Pipe
API 5L X80 Pipe (L555) is the highest-strength grade commonly used in modern line pipe applications. With a massive minimum yield strength of 80,500 psi (555 MPa), it is designed for the most demanding high-pressure gas transmission projects globally. X80 pipes allow for significantly thinner wall designs in large-diameter pipelines, offering substantial savings in steel tonnage and welding costs while providing advanced resistance to internal and external stresses.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | API SPEC 5L / ISO 3183 (PSL2 Mandatory) |
| Grade | X80 or L555 / PSL2 |
| OD Range | Seamless: up to 18" | Welded (LSAW/SSAW): up to 120" |
| WT Range | Standard Wall (STD) up to 120mm |
| Certification | EN 10204 3.2, NACE MR0175, Sour Service |
| Internal Coating | Epoxy Lining, Cement Mortar, Bituminous |
Mechanical Properties
| Property | X80 (PSL2 Typical) |
|---|---|
| Min Yield Strength | 80,500 psi (555 MPa) |
| Max Yield Strength | 102,300 psi (705 MPa) |
| Min Tensile Strength | 90,600 psi (625 MPa) |
| Max Tensile Strength | 119,700 psi (825 MPa) |
Chemical Composition (Maximum %)
| Element | PSL2 (X80 / L555) |
|---|---|
| Carbon (C) | 0.18% (Micro-alloyed) |
| Manganese (Mn) | 1.90% |
| Phosphorus (P) | 0.025% |
| Sulphur (S) | 0.015% |
| Silicon (Si) | 0.45% |
| Combined (Nb+V+Ti) | ≤ 0.15% |
Features and Benefits of API 5L X80 Pipe
- Maximum yield strength for extreme high-pressure operations
- Drastic reduction in pipeline weight compared to Grade B and X52
- Specialized thermomechanically rolled (TMCP) steel for refined grain structure
- Superior low-temperature toughness for arctic and deep-sea service
- High resistance to ductile fracture propagation (DWA testing compliant)
- Excellent weldability despite ultra-high strength due to low carbon equivalent
- Strict geometric control to ensure field welding speed and quality
- Designed for critical infrastructure with a service life of 50+ years
Applications & Uses
Mega Pipelines
Used in massive cross-continental gas pipelines requiring ultra-high internal pressure.
Deep Drilling
Critical for ultra-deep-water offshore projects where external pressure is extreme.
Strategic Reserves
Preferred for underground strategic oil storage and high-security energy distribution hubs.