API 5L X70 & X80 Line Pipes
API 5L X70 and API 5L X80 are high-strength line pipe grades defined under the API 5L specification, designed to transport oil, gas, and water in high-pressure, long-distance pipeline systems. These grades are categorized as high-yield steels and are primarily used in critical onshore and offshore energy infrastructure where durability, weldability, and corrosion resistance are essential.
Key Features
- High Yield Strength: X70 (70,000 psi) and X80 (80,000 psi) minimum yield strength.
- Superior Pressure Tolerance: Capable of handling extreme operational pressures.
- Excellent Weldability: Available in seamless and welded forms for diverse installation needs.
- Weight & Cost Efficiency: Enables thinner wall designs while maintaining strength.
- Sour Service Ready (PSL2): Available in sour service variants as per NACE MR0175.
Chemical Composition
Grade | Carbon (C) | Manganese (Mn) | Phosphorus (P) | Sulfur (S) |
X70 | 0.28 | 1.40 | 0.030 | 0.030 |
X80 | 0.28 | 1.40 | 0.030 | 0.030 |
Mechanical Properties
Property | X70 | X80 |
Yield Strength (min) | 485 MPa (70,300 psi) | 555 MPa (80,500 psi) |
Tensile Strength | 570–760 MPa | 600–825 MPa |
Elongation | ≥ 18% | ≥ 17% |
Applications
- Oil & Gas Transmission: Long-distance pipelines for crude and natural gas.
- Offshore Structures: Used in risers and structural elements for oil platforms.
- LNG Facilities: Deployed in cryogenic and high-pressure piping networks.
- Petrochemical & Refineries: For handling high-temperature and corrosive process media.
- Pipeline Maintenance: Applied in upgrading and replacing aging pipeline systems.
Forms Available
- Seamless Pipe: Suitable for high-pressure transmission and aggressive media.
- ERW Pipe: Cost-effective solution for moderate pressure pipelines.
- LSAW Pipe: Ideal for thick-wall, large-diameter line pipes.
- HSAW Pipe: Widely used in long-distance, high-capacity pipeline networks.
PSL1 vs PSL2 Comparison
Feature | PSL1 | PSL2 |
Mechanical Testing | Optional | Required (CVN, Yield, UTS, Elongation) |
Chemical Composition | Standard | Stricter limits with additional elements |
NDT for Welds | Optional | Mandatory |
Traceability | Not Required | Required |
Sour Service Suitability | Not Assured | SSC-compliant (NACE MR0175) |
Surface Finish and Coatings
- External options: Bare, black-painted, varnished, or anti-corrosion coated.
- Coatings: FBE, 3LPE, 3LPP, and custom options as per client requirements.
Quality Assurance & Packaging
- Certifications: API 5L, ISO 3183, ISO 9001, NACE MR0175 (PSL2).
- Third-Party Inspection: Conducted by DNV, SGS, BV, TUV as required.
- Packaging: Steel strapped bundles, plastic wrapped, capped ends, or crated for export.
Get in touch with Riyaarth Overseas for certified API 5L X70 & X80 line pipes engineered for global pipeline infrastructure—optimized for performance, tested for quality, and delivered with full traceability
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Industry We Serve
- Oil & Gas industries
- Chemical process industries
- Pump and valve in high pressure component
- Food industries
- Pulp and paper industry
- Aerospace industry
- Power plant
- Mechanical component
- Sugar industry
- Cement industry