API 5L X60 PSL 1 grade designations come from API Spec 5L Specification for Line Pipe. Stronger grades have the designation X followed by the specified minimum yield strength of the pipe steel, measured in kilopounds per square inch (abbreviated ksi). Standard Line Pipe has grade designation A and B. Application: gas, water and oil transportation in both oil and natural gas.
Chemical composition of API 5L X60
| Products | C | Si | Mn | P | S | V | Nb | Ti |
| API 5L X60 seamless steel pipe | ≤0.28 | ≤0.45 | ≤1.60 | ≤0.03 | ≤0.01 | ≤0.15 | ≤0.05 | ≤0.04 |
| API 5L X60 welded steel pipe | ≤0.26 | ≤ | ≤1.60 | ≤0.03 | ≤0.01 | ≤0.15 | ≤0.05 | ≤0.04 |
Mechanical properties of API 5L X60
| Standard | Tensile strength (Mpa) | Yield strength (Mpa) | Elongation (%) |
| API 5L X60 | ≥435 | ≥320 | ≥28 |
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