Duplex 2205 flanges are widely used in demanding piping systems that require exceptional strength, superior corrosion resistance, and long-term reliability. As a leading manufacturer in China, Jizhong provides high-quality Duplex 2205 flanges engineered for marine, chemical, oil & gas, and high-pressure applications.
What Is Duplex 2205?
Duplex 2205 is a duplex stainless steel consisting of approximately 50% ferritic phase and 50% austenitic phase, balancing strength and corrosion resistance better than standard stainless steels such as 304 or 316.
Its standardized designations include:
- UNS S32205 (newer and more stable grade)
- UNS S31803
- EN 1.4462
These are commonly referred to collectively as Duplex 2205.
Why It Is Called “2205”
The name “2205” comes from its typical chemical composition:
- 22% Chromium (Cr)
- 5% Nickel (Ni)
- 3% Molybdenum (Mo)
This chemical balance provides outstanding mechanical strength and excellent corrosion resistance in chloride-rich environments.
Key Advantages of Duplex 2205 Flanges
1. High Mechanical Strength
Duplex 2205 has nearly twice the yield strength of 316/316L stainless steel.
This allows for lighter, thinner, and more economical flange designs without compromising safety.
2. Excellent Corrosion Resistance
The alloy offers superior resistance to:
- Chloride-induced corrosion
- Pitting and crevice corrosion
- Stress corrosion cracking (SCC)
- Acidic or chemical media
This makes duplex 2205 flanges ideal for harsh industrial environments.
3. Superior Chloride Resistance
Duplex 2205 performs reliably in seawater, brackish water, and coastal atmospheres, far outperforming 316L.
4. Good Weldability
Compared to high-nickel alloys, Duplex 2205 maintains a stable duplex structure during welding, reducing the risk of cracking or corrosion failures.
Applications of Duplex 2205 Flanges
Jizhong’s duplex 2205 flanges are widely used in:
- Marine engineering & seawater systems
- Oil & gas upstream/midstream pipelines
- Chemical processing & petrochemical plants
- Pressure vessels and high-pressure piping
- Desalination plants
- Heat exchangers
- Pulp and paper industry
Wherever chloride corrosion, high pressure, or elevated strength is required, Duplex 2205 is a reliable choice.
Types of Duplex 2205 Flanges Available from Jizhong
We manufacture a full range of flange types, including:
- Weld Neck Flanges (WN)
- Slip-On Flanges (SO)
- Blind Flanges (BL)
- Socket Weld Flanges (SW)
- Lap Joint Flanges (LJ)
- Threaded Flanges (TH)
All products follow international standards such as ASME, ASTM, DIN, EN, and ISO.
Why Choose Jizhong as Your Duplex 2205 Flange Supplier?
- Over 20 years of experience in flange and pipe fitting production
- Strict material control to ensure authentic Duplex 2205 (S32205 / S31803)
- Advanced machining and inspection equipment
- Stable quality, fast delivery, and flexible OEM services
- Trusted by customers in the U.S., Europe, Middle East, Africa, and Southeast Asia
Jizhong is committed to providing reliable, high-performance duplex stainless steel solutions for global industrial projects.
Conclusion
Duplex 2205 flanges offer an excellent combination of strength, corrosion resistance, and cost-effectiveness, making them ideal for demanding environments.
With rich manufacturing experience and strict quality standards, Jizhong delivers durable and high-performance Duplex 2205 flanges for worldwide customers.
