X42 seamless steel pipe, also known as L290 pipeline steel, is a low-carbon microalloy steel pipe that complies with the API SPEC 5L standard.
The API 5L standard classifies pipeline pipes into two grades: PSL1 (ordinary quality) and PSL2 (premium quality). X42 PSL2 belongs to the latter and must meet more stringent requirements for chemical composition, mechanical properties, and non-destructive testing. For example, its carbon content is ≤0.24%, and phosphorus and sulfur content is ≤0.015%, which is significantly lower than the PSL1 standard. Additionally, PSL2 requires full-size 0°C longitudinal impact energy of ≥41J and transverse impact energy of ≥27J, ensuring the material's resistance to brittle fracture in low-temperature environments. Furthermore, PSL2 pipes must undergo hydrostatic testing (at 1.5 times the design pressure) and ultrasonic non-destructive testing on a pipe-by-pipe basis, with defect rates controlled below 0.3%, eliminating potential safety hazards at the source.
Dimension Tolerances of L290 X42 PSL2 Pipes
Chemical Structure of API 5l Grade X42 Pipe
| X42 PSL1 | X42 PSL2 | |||||||
|---|---|---|---|---|---|---|---|---|
| Grade | P | C | S | Mn | P | C | S | Mn |
| X42 | 0.03 | 0.26 | 0.03 | 1.30 | 0.025 | 0.22 | 0.015 | 1.40 |
Mechanical Properties X42 Pipe Material
| API 5L Grade | Yield Strength min. (ksi) | Tensile Strength min. (ksi) | Yield to Tensile Ratio (max.) | Elongation min. %1 |
|---|---|---|---|---|
| API 5L X42 Pipe | 42 | 60 | 0.93 | 23 |
Test and inspection
Packaging and shipping
