API 5L PSL2 X52 DSAW Steel Pipe
Basic Overview
API 5L PSL2 Grade X52 DSAW (Double-Sided Submerged Arc Welded) steel pipe is a medium-strength line pipe for oil & gas transmission. X52 means minimum yield strength 52,000 psi (359 MPa). PSL2 is the enhanced quality level with mandatory impact testing and tighter chemistry control.
Key Specifications (Simple)
| Attribute | Value |
|---|---|
| Standard | API 5L PSL2 |
| Grade | X52 (L360) |
| Yield Strength | 359-531 MPa (52-77 ksi) |
| Tensile Strength | 455-760 MPa (66-110 ksi) |
| Yield Ratio | ≤ 0.93 |
| Charpy Impact | Mandatory (typically 27J at 0°C) |
| Size Range | 16" to 72" OD |
| Wall Thickness | 6-50 mm |
| Length | 6-12 m standard |
Chemical Composition (PSL2 vs PSL1)
| Element | PSL2 | PSL1 | Difference |
|---|---|---|---|
| Carbon (C) | ≤0.24% | ≤0.28% | Tighter |
| Sulfur (S) | ≤0.015% | ≤0.030% | 50% reduction |
| Phosphorus (P) | ≤0.025% | ≤0.030% | Stricter |
PSL1 vs PSL2 - Key Differences
| Feature | PSL1 | PSL2 |
|---|---|---|
| Impact Testing | Not required | Mandatory |
| Max Yield Strength | Not specified | 531 MPa max |
| Sulfur Control | 0.030% | 0.015% |
| Traceability | Batch | Pipe-by-pipe |
| Best For | General service | Critical, sour, low temp |
DSAW Manufacturing
Double-sided welding (inside + outside)
Forms a single high-quality weld nugget
Used for large diameter pipes (16" to 72"+)
Methods: JCOE or UOE forming
Common Applications
Oil & gas transmission pipelines
Offshore pipelines
Sour service (H₂S environments)
Low-temperature service
Water transmission
Summary
API 5L PSL2 X52 DSAW pipe is the standard choice for medium-strength pipeline applications requiring guaranteed low-temperature toughness and sour service resistance. Compared to PSL1, it offers:
Mandatory Charpy impact testing
50% lower sulfur content
Maximum strength limits
Full traceability
When ordering, specify: API 5L PSL2 Grade X52, DSAW, Size (OD x WT), Length, Impact test temperature.
