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
FAQ's
X80 offers higher strength than X70, allowing for reduced wall thickness or increased pipeline capacity.
Yes, if specified as PSL2 with NACE MR0175 compliance and SSC-resistant chemistry.
Primarily oil and gas transmission, petrochemical, LNG, and offshore engineering sectors.
Products
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