2205 Duplex Steel WNRF Weld Neck Flange Class300, High Chloride Corrosion Resistant Industrial Flange

2205 duplex steel WNRF Class300 weld neck flange is a cost-effective flagship product for high chloride corrosion working conditions, integrating the dual metallographic advantages of austenite and ferrite with both high strength and superior chloride corrosion resistance, outperforming conventional 316L and 904L stainless steel in anti-corrosion performance. Manufactured strictly per ASME B16.5 Class300 medium-high pressure standards with universal S32205 duplex steel billet, the integrally forged product features balanced austenite and ferrite metallographic structure, with mechanical strength more than twice that of ordinary stainless steel, greatly improving pressure impact resistance, deformation resistance and fatigue resistance. Optimized for high chloride, salt water and weak acid corrosion conditions, it effectively resists chloride pitting, crevice corrosion and stress corrosion cracking, perfectly adapting to scenarios where ordinary stainless steel frequently fails, such as chemical chloride media, industrial salt water, high-salinity sewage and coastal high-chloride pipe networks. The tapered stress-relief hub adapts to continuous medium-pressure operation and pressure fluctuation to eliminate flange fatigue leakage. After precision CNC processing and duplex steel exclusive passivation, the dense and flat sealing surface delivers excellent medium scouring resistance and sealing stability. The NDT-capable full penetration weld has stable welding performance without complex heat treatment, serving as the optimal economical solution to replace expensive super stainless steel and nickel-based alloys for high-chloride corrosion conditions.

Core Selling Points

1. Duplex metallographic structure with more than twice the strength of ordinary stainless steel;

2. Superior chloride corrosion resistance over 316L/904L;

3. Triple advantages of pitting resistance, crevice corrosion resistance and stress cracking resistance;

4. Class300 medium-high pressure grade with excellent pressure and impact resistance;

5.  Ideal for high-salinity and high-chloride conditions with far better cost performance than special alloys;

6. Stable welding performance without complex heat treatment;

7. Integral forging structure with excellent deformation and fatigue resistance for long-term durability;

   8. Exclusive passivation treatment resists medium scouring and leakage.

Application Scenarios

Chloride chemical production lines, industrial salt water circulation systems, high-salinity sewage treatment pipe networks, coastal high-chloride corrosion pipelines, papermaking chemical corrosion pipelines, seawater pretreatment process pipelines, salt lake chemical transmission systems, high-chloride flue gas desulfurization auxiliary pipelines.

Why Choose Us

Specialized in mass production of 2205 duplex steel flanges, we strictly control duplex metallographic ratio and forging technology to avoid anti-corrosion failure caused by unbalanced metallography. All products undergo exclusive duplex steel PMI testing, metallographic ratio verification and pressure adaptation test to ensure qualified anti-corrosion and mechanical properties. We provide duplex steel MTR certificates, metallographic test reports and NDT data, supporting bulk supply for global chloride chemical and environmental water treatment projects as a cost-effective alternative to imported special alloy flanges.

Customization Capability

Enhanced anti-corrosion treatment for high-chloride working conditions; custom non-standard large-diameter duplex steel flanges; thickened medium and high-pressure pressure-resistant flanges; precise metallographic ratio customization; exclusive sealing finishing for chloride chemical industry; project traceability laser marking; third-party metallographic performance test reports.

FAQ

1:How long is the custom lead time for stainless steel flanges in Wenzhou?

— 8 to 10 working days

2:What is the fastest delivery time?

— 3 working days

3:Do you support non-standard custom flanges?

— Yes, we do.

4:Can you process special sizes?

— Yes. Max processing size: 4000 mm, Min processing size: 30 mm.

5:Do you have stainless steel flanges of standard sizes in stock?

— Yes.

6:Can we customize flanges based on customer drawings or samples?

— Yes.

7:Will material test certificates and inspection reports be provided for the purchased flanges?

— Yes, they will.

8:Is there a quality warranty for the flange products?

— Yes.

9:How to handle quality defects if they occur?

— Product return and exchange available.

10.Why choose 2205 instead of 316L for high-chloride chemical conditions?

—316L cannot resist high-chloride pitting and stress corrosion and is prone to perforation and leakage. 2205 duplex steel is specially designed for high-chloride conditions with higher strength and more stable anti-corrosion performance at better cost performance than special alloys.