UNS S32205 | For Extreme Environments
22% Cr, 5% Ni duplex pipes delivering 2x yield strength vs 316L. Perfect for offshore risers handling H₂S-containing media (-30°C to 250°C). Pitting Resistance Equivalent >40. Buy duplex stainless steel pipe from China manufacturer Guangxin PipeTech. Duplex 2507 pipe with H₂S resistance for oil & gas. Get competitive prices!
Austenitic Stainless Steel: 304, 316L, 321, 317L
Duplex Stainless Steel: 2205, 2507
Nickel Alloys: Monel 400, Inconel 600/625, Incoloy 825, Hastelloy C-276, etc.
Round Seamless Pipes (most common)
Square and Rectangular Seamless Tubes (available upon request)
Plain End (PE), Beveled End (BE), or Threaded End (TE)
Outer Diameter (OD): from 6mm to 630mm
Wall Thickness: from 0.5mm to 50mm
Length: fixed length or random length (up to 12 meters or as per customer specification)
Application Area Typical Material Key Features
Chemical & Petrochemical 316L, 317L, Alloy 825 Acid and corrosion resistance
Marine & Offshore 2205, 2507, Alloy 625 Chloride resistance and high strength
Power & Heat Exchangers 321, Inconel 600 Thermal stability and pressure resistance
Oil & Gas (Sour Service) Alloy 400, Alloy 825 Resistance to H₂S and CO₂ environments
Pharmaceutical & Sanitary 304L, 316L Clean surfaces and hygienic performance
| Technical Specifications | |
| PREN Value | ≥35 |
| Phase Balance | Ferrite 40-55% |
| Impact Toughness | 100J @ -46°C |
| Chloride Resistance | ≤15,000ppm @80°C |
| Certification | NORSOK M-630 |
UNS S32205 (22Cr-5Ni-3Mo-0.15N) requires ferrite-austenite phase equilibrium (40-55% ferrite) per ASTM A182. The PREN (Pitting Resistance Equivalent Number) exceeds 35, calculated as %Cr + 3.3x%Mo + 16x%N. Critical copper impurity is controlled at <0.5% to avoid sigma phase precipitation.
Yield Strength: 450-550 MPa (2x 316L)
Fatigue Endurance: 380 MPa at 10⁶ cycles (DNV-OS-F101)
Thermal Conductivity: 15 W/m·K @100°C (25% higher than 316L)
CTE: 13 µm/m°C (20-100°C) avoiding thermal stress cracking
Billets solution-treated at 1080°C with accelerated water quenching achieves ASTM grain size 7-8. Automatic ultrasonic testing detects imperfections >5% wall thickness. Hardness is maintained at 250-290 HV30 to meet NACE standards.
Subsea Christmas tree components (API 6A specification)
Seawater-cooled heat exchangers handling H₂S at 50 ppm
Geothermal brine injection systems at 150°C
LNG cryogenic transfer pipes (-165°C service)
NORSOK M650-S1 • ASTM A790 • ISO 15156-3 (Material Class 3c)
1. Exceptional Strength and Durability
Duplex stainless steel seamless pipes combine the best properties of austenitic and ferritic stainless steels, offering high tensile and yield strength. This allows for thinner wall designs without compromising structural integrity, reducing overall material weight and cost. The seamless construction further enhances strength by eliminating weld joints — the weakest points in a piping system — ensuring reliable performance in demanding industrial conditions.
2. Superior Corrosion Resistance
One of the standout advantages of duplex stainless steel seamless pipes is their excellent resistance to corrosion, particularly pitting, crevice, and stress corrosion cracking. This makes them ideal for use in harsh environments such as offshore oil platforms, desalination plants, and chemical processing units where exposure to chlorides and acidic substances is constant.
3. Excellent Performance in High-Pressure and High-Temperature Environments
The duplex microstructure provides excellent stability under both high pressure and fluctuating temperatures. These pipes maintain mechanical integrity even under thermal cycling and pressure surges, making them a preferred choice for oil and gas transmission lines, heat exchangers, and marine applications.
4. Enhanced Cost Efficiency
Despite their superior performance, duplex stainless steel seamless pipes offer a cost advantage over high-alloy stainless steels such as super austenitic grades. Their higher strength allows the use of smaller diameters or thinner walls for the same pressure rating, resulting in material savings and lower fabrication costs.
5. Long Service Life and Low Maintenance
Thanks to their robust mechanical and chemical properties, duplex stainless steel seamless pipes provide long-term operational reliability with minimal maintenance requirements. Their resistance to corrosion and erosion means fewer replacements, reduced downtime, and better lifecycle cost efficiency — an essential factor for industrial buyers focused on operational sustainability.
