API 5L X52 LSAW Steel Pipe(1)
Basic Product Information
Item | Details |
Full Product Name | API 5L Grade X52 Longitudinal Submerged Arc Welded (LSAW) Steel Line Pipe |
Standard Compliance | API Spec 5L (46th Edition), ISO 3183, GB/T 9711 |
Equivalent Grade | L360 (per European/Chinese standard designation) |
Product Level | Available in PSL1 / PSL2 |
Delivery State | N(Normalized), Q(Quenched & Tempered), M(Thermo-mechanically Controlled Rolling) |
Chemical Composition
Element | PSL1 | PSL2 |
Carbon (C) | 0.28 | 0.24 |
Manganese (Mn) | 1.4 | 1.4 |
Phosphorus (P) | 0.03 | 0.025 |
Sulfur (S) | 0.03 | 0.01 |
Niobium (Nb) | 0.06 | 0.06 |
Vanadium (V) | 0.06 | 0.06 |
Titanium (Ti) | 0.04 | 0.04 |
Carbon Equivalent (Ceq) | - | ≤ 0.43% |
Mechanical Properties
Property | Requirement |
Minimum Yield Strength | 358 MPa (52,000 psi) |
Yield Strength Range | 358 - 531 MPa |
Tensile Strength Range | 455 - 760 MPa |
Yield-to-Tensile Ratio | ≤ 0.93 |
-20℃ Charpy V-notch Impact Energy | ≥ 40 J |
Maximum Hardness (Base Metal) | ≤ 250 HB |
Maximum Hardness (Weld) | ≤ 280 HB |
Available Size Range
Dimension | Range |
Outer Diameter | 406 mm - 2500 mm (16 " - 100") |
Wall Thickness | 6.0mm - 60mm (SCH 10 - SCH 160, STD/XS/XXS available) |
Standard Length | 5.8 m (19ft), 6.0 m (20ft), 11.8 m (38.7ft), 12.0 m (40ft), SRL/DRL |
Custom Length | Available upon request |
Manufacturing & Quality Control
Process Step | Details |
Forming Method | JCOE / UOE |
Welding Process | Double-sided submerged arc welding (DSAW) |
Weld Treatment | Online scarfing, post-weld normalization (900-950℃) |
Non-destructive Testing | 100% Ultrasonic Testing (UT), 100% Eddy Current Testing (ET), X-ray imaging for high-requirement products |
Additional Tests | Hydrostatic test (1.5× standard pressure, ≥10s holding), Guided-bend test, CVN impact test, DWT test (for PSL2) |
End Treatment & Surface Protection
Option | Available Types |
End Preparation | Plain end, Beveled end, Threaded end |
Surface Coatings | Natural bare steel, Black paint, Varnish, FBE, 3LPE/3PP coating |
End Protection | Plastic or iron protect caps available |
Key Features & Applications
Feature | Benefit | Typical Applications |
Precise forming, low residual stress | High dimensional stability and pressure resistance | Large-diameter long-distance oil & gas transmission pipelines |
Excellent low-temperature toughness | Stable performance in extremely cold environments | Onshore & subsea oil/gas collection and transmission lines |
Good weldability and corrosion resistance | Lower construction cost, longer service life | Urban high-pressure gas distribution networks, water injection pipelines for oilfields |
Cost-effective for large diameter | Lower material and installation cost than seamless pipe | Offshore platform risers, CCUS and hydrogen transmission infrastructure, structural pipe piling |
API 5L X52 LSAW Steel Pipe production Process
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