API 5L X52 Steel Pipe
Products Description of API 5L X52 Steel Pipe
Parameter | Range |
Outer Diameter (OD) | 21.3mm-1200 mm (1/2 " - 48") |
Wall Thickness (WT) | 2 mm - 130mm |
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, primarilyAPI SPEC 5Land its equivalent Chinese national standardGB/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) | ≥ 0.15mm at -10°C | mm |
Export referenceAPI 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.
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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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