Products Description of API 5L X52 Steel Pipe
| Parameter | Range |
| Outer Diameter (OD) | 21.3 mm – 1200 mm (1/2" – 48") |
| Wall Thickness (WT) | 2 mm – 130 mm |
| Length | Random Length (R/L), Double Random Length (DRL), or Fixed Length (e.g., 6m, 12m) |
| Tolerances | OD: ±0.75%, WT: -12.5% to +15% (PSL2) |
Specifications and Standards of API 5L X52 Steel Pipe
The product adheres to stringent international standards, primarily API SPEC 5L and its equivalent Chinese national standard GB/T 9711. Within the API 5L framework, it is produced under two Product Specification Levels (PSL):
PSL 1: Defines standard quality requirements for general use.
PSL 2: Imposes more rigorous requirements on chemical composition, mechanical properties, toughness testing (like Charpy V-Notch impact tests), non-destructive examination (NDE), and traceability. PSL 2 pipes are mandatory for more severe service conditions, such as high-pressure, low-temperature, or sour (H₂S-containing) environments.
For PSL 2 pipes, suffixes are added to the grade to denote the delivery condition or special properties:
X52N: Normalized or normalized-rolled.
X52Q: Quenched and tempered.
X52M: Thermomechanically rolled (TMCP).
Chemical Composition (Typical Maximum for API 5L X52 Seamless Steel Pipe)
| Element | Maximum Content (%) | Notes |
| Carbon (C) | 0.18–0.24 | Lower carbon improves weldability and reduces cold cracking risk |
| Manganese (Mn) | 1.40–1.65 | Enhances strength and grain refinement |
| Phosphorus (P) | ≤0.025 | Minimizes brittleness and segregation |
| Sulfur (S) | ≤0.015–0.030 | Controlled to prevent hot cracking and improve toughness |
| Niobium (Nb) | ≤0.05–0.06 | Microalloying for precipitation hardening and grain control |
| Vanadium (V) | ≤0.06–0.10 | Improves strength and high-temperature stability |
| Titanium (Ti) | ≤0.04 | Stabilizes nitrogen and refines grain structure |
| Carbon Equivalent (Ceq) | ≤0.43 | Ensures good weldability (CEIIW or CEPcm formula) |
Mechanical Properties (API 5L PSL2 Requirements)
| Property | Range / Requirement | Unit |
| Yield Strength (Rt₀.₅) | 360 – 530 | MPa |
| Tensile Strength (Rm) | 460 – 760 | MPa |
| Yield-to-Tensile Ratio (Rt₀.₅/Rm) | ≤ 0.93 | - |
| Elongation (A) | ≥ 19% (for 50mm gauge length) | % |
| Hardness | ≤ 250 HB (base metal), ≤ 280 HB (weld zone) | HB |
| Impact Toughness (CVN) | ≥ 40 J at -20°C (PSL2 mandatory) | J |
| Fracture Toughness (CTOD) | ≥ 0.15 mm at -10°C | mm |
Export reference of API 5L X52 Steel Pipe
Kazakhstan – Natural Gas Pipeline Project (2024).
Country: Kazakhstan.
Project: Major onshore natural gas transmission pipeline.
Quantity: 80,000 metric tons of X52M welded pipe (note: seamless variants were also procured in parallel for critical sections).
Application: The seamless pipes were used in high-pressure zones and river crossings where structural integrity is critical.
What is your most competitive advantange?
End-to-End Customer Support:
We provide comprehensive services from pre-sales to after-sales:
Technical Consultation: Our engineers assist with material selection, design optimization, and compliance verification.
On-Site Services: We offer welding guidance and installation support to ensure project success.
Lifecycle Management: We provide long-term maintenance advice and spare parts supply to maximize asset value.
By combining uncompromising quality, technical innovation, and customer-centric service, we have become a trusted partner for energy infrastructure projects worldwide. Whether you need pipes for onshore pipelines, offshore platforms, or industrial applications, we deliver solutions that exceed expectations.
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