Duplex 2205 Stainless Steel Pipe Fittings for High-Strength and Chloride SCC Resistance

High Strength (≥450 MPa Yield): Allows lighter schedules and reduced weight.

Superior SCC Resistance: Performs in high-chloride environments where 316L fails.

Excellent Pitting Resistance: PRE ≥ 35 (S32205) – suitable for seawater up to 250°C.

Good Weldability: Requires proper welding procedure (low heat input) but no PWHT for most applications.

Full Range: Butt-weld (ASME B16.9), socket-weld (ASME B16.11), threaded (NPT) – all available in 2205.

International Certifications: ABS, BV, DNV, LR, NORSOK M-650, NACE MR0175.

The PREN (Pitting Resistance Equivalent) for S32205 is ≥35, providing excellent resistance to pitting and crevice corrosion in chloride-containing environments.

Heat Treatment Condition:
All duplex 2205 fittings are solution annealed at 1040–1120°C followed by rapid water quenching. This treatment restores the balanced ferrite-austenite microstructure (35–65% ferrite), relieves internal stresses, and ensures optimum corrosion resistance.

Note: Duplex stainless steel has lower derating factors at elevated temperatures than austenitic grades. Consult ASME B16.11 and project specifications.

Raw Material Selection: High-quality duplex 2205 billets from certified mills (Outokumpu, Sandvik, Baosteel).

Cutting & Heating: Cut to exact volume and induction-heated to plastic forming temperature.

Forming: Hot extruded using hydraulic presses or mandrel push machines.

Shaping & Sizing: Calibrated in dies to ensure accurate angle, radius, and uniform wall thickness.

Solution Annealing: Heat treated at 1040–1120°C followed by rapid water quenching.

End Finishing: Beveling for butt-weld ends; threading or socket boring for SW/threaded.

Pickling & Passivation: Removes oxide scale and creates a passive film.

Marking & Inspection: Laser/inkjet marked with grade, heat number, size, and standard.

Chemical Analysis: PMI 100% verification of Cr, Ni, Mo, N.

Ferrite Content Measurement: 35–65% ferrite required.

Mechanical Testing: Tensile, yield, elongation, hardness (per ASTM A370).

Dimensional Inspection: Go/no-go gauges, CMM, angle/wall thickness tools.

NDT: 100% Penetrant Testing (PT) for surface defects; UT/RT upon request.

Hydrostatic / Pneumatic Testing: According to ASME B16.9 or customer specification.

Corrosion Testing: Intergranular corrosion test (ASTM A262 Practice E); pitting test (ASTM G48) optional.

Third-Party Inspection: SGS, BV, DNV, TUV available.

Offshore Oil & Gas: Topside and subsea piping, umbilical fittings, swivel joints (ABS, DNV, LR certified).

Desalination: Brine heater connections, high-pressure reverse osmosis piping.Seawater Cooling: Power plant intake lines, FGD absorber connections.

Chemical Processing: Chloride-containing acids, pulp & paper bleach plants.

Marine: Ballast water systems, firefighting lines.

Small bore fittings (≤2″): Cartons or woven bags with moisture-proof film.

Large bore fittings (≥2.5″): Wooden pallets + stretch film, or steel frames / wooden crates.

End Protection: Plastic caps for butt-weld ends; thread protectors for threaded ends.

Labeling: Each fitting has a sticker (material, heat number, size) plus waterproof shipping marks.

Ready stock: 1/2″–12″ Sch10S/Sch40S – dispatch within 24 hours.

Direct shipping cooperation with global shipowners for competitive freight.

Professional loading teams ensure secure packing.

Fast customs clearance with complete documentation.

1. Are Duplex 2205 fittings weldable without PWHT?
Yes, but require low heat input and N₂-containing shielding gas. Post-weld heat treatment is not required for most applications due to the duplex microstructure.

2. Can you supply 2205 fittings for sour service (H₂S)?
Yes, we supply NACE MR0175 compliant 2205 fittings with full documentation and HIC/SSC test reports upon request.

3. What is the maximum service temperature for 2205 fittings?
Continuous use up to 250°C in chloride service; above 300°C risk of sigma phase embrittlement.

Complete Product Range: Butt-weld, socket-weld, and threaded fittings – one-stop purchasing.

Strict Quality Control: ISO 9001, PED 2014/68/EU, and NORSOK M-650 certified.

Advanced Production Lines: Hydraulic push lines and CNC machining centers.

Full Traceability: From heat number to finished fitting – traceable back to raw material.

Flexible Customization: Non-standard sizes, special bevels, exotic materials available.

Global Delivery: Exported to over 50 countries including Middle East, Southeast Asia, Europe, and South America.

Tel / WhatsApp:

Victor: +86 15575100681

Jack: +86 18390957568

E-mail: info@womicstainless.com

Website: www.womicsteel.com

Contact Womic Steel today for a competitive quote on Duplex 2205 stainless steel pipe fittings. We offer certified quality, fast production lead times, and reliable global delivery to keep your pipeline projects running smoothly.

Stock Examples:

90° LR Elbow: 2″ Sch10S, 4″ Sch40S, 6″ Sch10S

Equal Tee: 2″×2″ Sch40S, 4″×4″ Sch10S

Concentric Reducer: 4″×2″ Sch40S, 6″×4″ Sch10S

Cap: 6″ Sch40S, 8″ Sch40S

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