Duplex 2205 Stainless Steel Channels

High Strength (≥450 MPa Yield): Approximately twice the yield strength of 304/304L and 316/316L, allowing for lighter structural sections and significant weight reduction in frameworks.

Superior Chloride Stress Corrosion Cracking Resistance: Outstanding resistance to chloride-induced SCC, performing reliably in high-chloride environments where 304L and 316L fail.

Excellent Pitting and Crevice Corrosion Resistance: PRE (Pitting Resistance Equivalent) ≥ 34 for S31803 and ≥ 35 for S32205, providing reliable service in seawater and aggressive chemical media.

Balanced Dual-Phase Microstructure: Approximately 50% ferrite and 50% austenite provides excellent combination of mechanical properties and corrosion resistance.

Good Weldability: Maintains balanced ferrite/austenite ratio in the weld zone with proper welding procedures using matching filler metals (ER2209).

High Resistance to Erosion and Wear: Higher hardness and strength provide improved resistance to erosion and wear compared to austenitic grades.

Excellent Impact Toughness: Maintains good impact toughness down to -40°C, suitable for cold climate and offshore applications.

Low Thermal Expansion: Coefficient of thermal expansion (13.5 μm/m·K) lower than austenitic grades (15.9-17.2 μm/m·K), reducing thermal stress in welded structures.

NACE MR0175 / ISO 15156 Compliant: Fully qualified for sour service applications.

International Certifications: Channels can be certified by ABS, BV, DNV, LR, GL, RINA, CCS, KR, and NK, and comply with NORSOK M-630 standards.

S32205 is a restricted composition range of S31803, offering tighter control of Cr, Mo, and N to enhance corrosion resistance and ensure optimal phase balance. The PRE (Pitting Resistance Equivalent) for S32205 is ≥35, compared to ≤26 for 316L.

Comparison of Strength and Corrosion Resistance:

Impact Toughness (Charpy V-Notch, typical at -40°C):

Longitudinal: ≥ 60 J (typical)

Heat Treatment Condition:
Duplex 2205 stainless steel channels are solution annealed at 1040–1120°C followed by rapid cooling (water quenching) . This heat treatment restores the balanced 40–60% ferrite / 40–60% austenite microstructure, dissolves unwanted intermetallic phases, relieves internal stresses, and ensures maximum corrosion resistance.

Critical Note: Unlike austenitic grades, Duplex 2205 requires water quenching after solution annealing. Air cooling may result in intermetallic phase precipitation, reducing corrosion resistance and toughness.

Delivery Condition:
Channels are normally supplied in solution annealed and pickled condition, providing a clean, smooth surface and excellent corrosion resistance. Upon request, grit blasted finish can be provided for applications requiring enhanced paint adhesion.

*Note: Weights calculated based on density 7.80 g/cm³. Custom sizes and longer lengths available upon request.*

Chemical Analysis: PMI verification for Cr, Ni, Mo, N (critical for duplex performance).

Ferrite Content Measurement: Magnetic induction method – requirement 35–65% ferrite documented.

Microstructure Examination: Verification of balanced dual-phase structure, absence of intermetallic phases (sigma, chi).

Mechanical Testing: Tensile strength (≥620 MPa), yield strength (≥450 MPa), elongation (≥25%), hardness (≤290 HBW).

Charpy Impact Testing: Verification of low-temperature toughness at -40°C (upon request).

Dimensional Inspection: Web height, flange width, thickness, squareness, straightness, length.

Surface Inspection: Visual check for surface defects, cracks, and consistency.

Pitting Corrosion Test: ASTM G48 – upon request.

Third-Party Inspection: SGS, BV, DNV, TUV, LR, ABS available upon customer request.

Offshore Oil & Gas Platforms: Topside structural supports, module frameworks, pipe rack channels, flare boom supports, crane pedestal structures, living quarters framing (ABS, BV, DNV, LR certified, NORSOK M-630 compliant).

Marine Engineering & Shipbuilding: Vessel structural framing, ship hull stiffeners, deck supports, bulkhead reinforcements, seawater intake structures (classification society certified).

Seawater Systems: Intake structure framing, outfall diffuser supports, seawater pump foundations, cooling water intake screens.

Desalination Plants: Brine line supports, evaporator structural frames, piping rack structures, equipment platforms.

Chemical Processing (Chloride Service): Equipment frameworks in high-chloride environments, pipe supports for corrosive media, platform structures in chemical plants.

Flue Gas Desulfurization (FGD): Scrubber structural supports, absorber tower platforms, ductwork supports.

Pulp & Paper Industry: Bleach plant structural supports, digester platforms, chemical recovery equipment framing.

Bridge Components (Marine/Coastal): Bridge structural elements, handrails, access walkways, expansion joint supports.

Water Treatment (High Chloride): Brackish water treatment plant structures, reverse osmosis plant frameworks.

Port & Harbor Facilities: Crane rail supports, dock fendering structures, pier framing, loading platform supports.

Standard Packaging:

Bundles with steel straps and woven fabric wrapping

Plastic end protection for cut edges

Wooden pallets or crates for export sea-worthy transport

Individual bundle labeling with grade, heat number, dimensions, quantity, ferrite content

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners – competitive freight rates

Professional loading and securing teams prevent bending and damage during transit

Efficient document preparation (including NORSOK M-630 documentation) minimizes customs delays

Rapid delivery time – standard sizes kept in ready stock

Continuous cargo tracking and after-sales follow-up

1. Why choose Duplex 2205 over 316L for channel applications in marine environments?
Duplex 2205 offers approximately twice the yield strength (≥450 MPa vs ≥170 MPa) and superior chloride SCC resistance. In seawater and high-chloride environments where 316L is susceptible to pitting and crevice corrosion, Duplex 2205 provides reliable long-term performance.

2. What is the difference between S31803 and S32205 Duplex 2205 channels?
S32205 has tighter composition controls (higher Cr, Mo, and N), providing enhanced corrosion resistance (PRE ≥35 vs ≥34). S32205 is generally preferred for new offshore construction.

3. Can Duplex 2205 channels be welded?
Yes, but require proper welding procedures with low heat input and N₂-containing shielding gas. Matching filler metal ER2209 is recommended. Post-weld heat treatment is generally not required.

4. What is the maximum service temperature for Duplex 2205 channels?
250°C (482°F) for continuous service in chloride environments; 300°C (572°F) for non-chloride service. Above 300°C, risk of sigma phase embrittlement.

5. Are Duplex 2205 channels suitable for sour service (H₂S environments)?
Duplex 2205 is NACE MR0175 compliant for sour service applications up to 232°C (450°F). For specific oil and gas applications, consult Womic Steel for NACE certification documentation.

6. Do Duplex 2205 channels require special surface preparation for painting?
Grit blasting is recommended to create a uniform surface profile for paint adhesion on topside offshore structures.

High-Strength Material: Yield strength ≥450 MPa – significantly stronger than austenitic grades

Marine & Offshore Certified: ABS, BV, DNV, LR, GL certifications available

NORSOK M-630 Compliant: Full documentation for offshore projects

Ferrite Controlled: 35-65% ferrite documented per heat

Full Traceability: Heat number on each bundle – traceable to raw material

Complete Size Range: From 75mm to 300mm web height – standard and custom sizes

Flexible Customization: Special lengths, surface finishes, and non-standard sizes available

Global Delivery: Exported to major offshore and marine projects worldwide

Website: www.womicstainless.com

E-mail: info@womicstainless.com

Tel / WhatsApp / WeChat:

Victor: +86 15575100681

Jack: +86 18390957568

Womic Steel – Your reliable partner for high‑quality stainless steel products, precision machined components, and custom solutions for corrosion‑resistant applications.

Stock Examples (Duplex 2205 Stainless Steel Channels – Annealed & Pickled – Offshore Grade):

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