API 5L PSL2 X70 vs API 5L PSL2 X80
Property comparison of API 5L PSL2 X70 and API 5L PSL2 X80, both carbon steel.
| Property | API 5L PSL2 X70 | API 5L PSL2 X80 | Difference |
|---|---|---|---|
| Yield strength | 485 MPa | 555 MPa | +14% |
| Tensile strength | 570 MPa | 625 MPa | +10% |
| Elastic modulus | 207,000 MPa | 207,000 MPa | 0% |
| Shear modulus | 80,000 MPa | 80,000 MPa | 0% |
| Poisson ratio | 0.3 | 0.3 | 0% |
| Density | 7,850 kg/m³ | 7,850 kg/m³ | 0% |
| Thermal conductivity | 65.4 W/m·K | 65.4 W/m·K | 0% |
| Specific heat | 457 J/kg·K | 457 J/kg·K | 0% |
| Coefficient of thermal expansion | 0.000012 1/K | 0.000012 1/K | 0% |
Difference is API 5L PSL2 X80 relative to API 5L PSL2 X70. Values are taken from the representative row of each material; both materials may have multiple heat treatments or conditions on their individual pages.
Identification
- grade
- X70 / L485
- standard
- API 5L (PSL2)
- heat treatment
- Thermomechanically rolled
- grade
- X80 / L555
- standard
- API 5L (PSL2)
- heat treatment
- Thermomechanically rolled or Q&T
About API 5L line pipe
API 5L is the line pipe specification for oil and gas pipelines. Grades are designated by minimum yield strength in ksi (X42, X52, X60, X65, X70, X80). PSL 2 is the higher-quality product specification level with stricter chemistry, mechanical, and inspection requirements; PSL 1 is for lower-pressure service.
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