High-Strength Duplex Steel Pipe, Combining Superior Chloride Stress Corrosion Cracking Resistance with Structural Strength, for Subsea Pipelines and Demanding Chemical Processes
| Element | Content (%) | Role in Duplex Steel |
|---|---|---|
| Cr | 21.0–23.0 | Forms passive film; Mo synergistically enhances corrosion resistance; duplex microstructure refines grains. |
| Ni | 4.5–6.5 | Stabilizes austenite; ~1:1 duplex ratio, balances strength and toughness. |
| Mo | 2.5–3.5 | Enhances pitting resistance; maintains passive film in chloride-rich crude oil. |
Physical: Density 7.8 g/cm³, Melting Point 1300–1390℃, Thermal Conductivity 25 W/(m·K) (50% higher than 304)
Mechanical: Impact energy at -40℃ ≥34 J; good weldability; welded joint strength ≥90% of base metal
Outer Diameter: 25–325 mm
Wall Thickness: 3–20 mm
Length: 6–12 m (±10 mm)
Surface Treatment: Outer wall sandblasted (anti-slip), inner wall mechanically polished (Ra ≤1.6 μm), optional PE anti-corrosion layer
Stainless Steel Tubes Packed in Truck
Wooden Crate Packaging in Factory
Neo-Mac Machine with Stainless Steel Tubes
Factory Tube Packaging Process
Industrial Manufacturing Equipment
Stainless Steel Composition Analyzer
Specification: Φ168×8 mm
Performance: Pressure resistance 12 MPa, H₂S corrosion resistant
Case: South China Sea Liwan Oilfield Subsea Pipeline
Specification: Φ89×6 mm
Performance: Resistant to 10% HCl (60℃)
Case: Sinopec Maoming Ethylene Project Process Pipeline
Technical datasheets (PDF) available on request
Material test certificates (MTC) provided with shipments
Welding and fabrication guidelines upon inquiry
Walmay will help match the right stainless product form and specification for your application, confirm quantities and packing needs, and provide requested documents based on order requirements.
