API 5L X65 vs API 5L X60
These two grades are listed as equivalents of each other: their chemistry windows overlap and they serve the same applications. They are not always identical — check the differences below before substituting, especially in certified designs.
API 5L X65
Pipe & Tube Steel
API 5L X65 is the mainstream high-grade line pipe for modern gas transmission, including many of the large-diameter Chinese and transcontinental projects. It offers X70-class economics in milder designs with easier welding than the highest grades.
Standards: DIN L450 (near) · AISI API 5L X65 (PSL2) · GB L450 (GB/T 9711)
API 5L X60
Pipe & Tube Steel
API 5L X60 is a high-strength line-pipe grade for long-distance, high-pressure gas pipelines, where its 415 MPa yield cuts wall thickness and steel tonnage versus X52. Modern X60 is TMCP plate or coil with very low carbon.
Standards: DIN L415 (near) · AISI API 5L X60 (PSL2) · GB L415 (GB/T 9711)
Chemical composition compared (%)
| Element | API 5L X65 | API 5L X60 |
|---|---|---|
| C | ≤0.24 (PSL2) | ≤0.24 (PSL2) |
| Si | ≤0.45 | ≤0.45 |
| Mn | ≤1.65 (PSL2) | ≤1.65 (PSL2) |
| P | ≤0.025 | ≤0.025 |
| S | ≤0.015 | ≤0.015 |
Properties compared
| Property | API 5L X65 | API 5L X60 |
|---|---|---|
| Yield strength | ≥450 MPa (65,000 psi) | ≥415 MPa (60,000 psi) |
| Tensile strength | 535–760 MPa (PSL2) | 520–760 MPa (PSL2) |
| Density | 7.85 g/cm³ | 7.85 g/cm³ |
Sourcing either grade?
Nasteel stocks both families from Shenzhen with EN 10204 3.1 mill certificates by heat number.
Ask for a quotationSee full data sheets: API 5L X65 · API 5L X60. Substitution decisions for certified parts stay with the design authority.