API 5L X70 Pipe
Ultra High-Strength API 5L X70 (L485) Line Pipe
API 5L X70 Pipe, also designated as L485, is a high-yield strength carbon steel material designed for large-diameter, long-distance pipelines. With a minimum yield strength of 70,300 psi (485 MPa), it enables engineers to design pipelines with thinner walls while maintaining high internal pressure ratings, significantly reducing material and transportation costs. X70 is the preferred grade for high-pressure natural gas transmission systems and complex offshore oil developments.
Technical Specifications
| Feature | Details |
|---|---|
| Standard | API SPEC 5L / ISO 3183 |
| Grade | X70 or L485 / PSL1 / PSL2 |
| Outer Diameter | Seamless: up to 24" | Welded: up to 100" |
| Wall Thickness | SCH 10 to SCH 160 / STD / XS / XXS |
| Product Type | LSAW, SSAW, ERW, Seamless |
| Inspection | UT, MPI, X-Ray, Hydro-test, CVN Impact |
Mechanical Properties
| Property | X70 (PSL1) | X70 (PSL2) |
|---|---|---|
| Min Yield Strength | 70,300 psi (485 MPa) | 70,300 psi (485 MPa) |
| Max Yield Strength | None | 92,100 psi (635 MPa) |
| Min Tensile Strength | 82,700 psi (570 MPa) | 82,700 psi (570 MPa) |
| Max Tensile Strength | None | 110,200 psi (760 MPa) |
Chemical Composition (Maximum %)
| Element | PSL1 (X70) | PSL2 (X70) |
|---|---|---|
| Carbon (C) | 0.28% | 0.22% |
| Manganese (Mn) | 1.60% | 1.60% |
| Phosphorus (P) | 0.030% | 0.025% |
| Sulphur (S) | 0.030% | 0.015% |
| Silicon (Si) | - | 0.45% |
| Nb + V + Ti | ≤ 0.15% | ≤ 0.15% |
Features and Benefits of API 5L X70 Pipe
- Exceptional strength-to-weight ratio for large-scale pipeline efficiency
- Enhanced fracture toughness and crack arrest capability
- Thermo-mechanically processed for superior grain structure
- Certified for extreme cold-temperature service (PSL2 requirements)
- Low carbon equivalent ensuring high-quality field welding
- Proven performance in high-seismic and geologically active areas
- Full compliance with NACE MR0175 for hydrogen-sulphide (Sour) service
- Optimized for high-pressure operation with reduced operational risk
Applications & Uses
Arctic Service
Engineered for high-pressure oil and gas transport in sub-zero environments.
Gas Gathering
Used in high-pressure gathering lines from offshore production platforms.
Heavy Infrastructure
Applied in major structural projects where high tensile strength is mandatory.