Duplex 2205 Stainless Steel Plates

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

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.

International Certifications: Plates 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 addition of nitrogen promotes austenite stability and significantly increases pitting resistance. The PRE (Pitting Resistance Equivalent) for S32205 is ≥35, calculated as PRE = %Cr + 3.3 × %Mo + 16 × %N.

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

Longitudinal: ≥ 60 J (typical)

Comparison of Strength (Duplex 2205 vs Austenitic Grades):

Maximum Recommended Service Temperatures:

Critical Note: Duplex 2205 is not recommended for prolonged service above 300°C due to the risk of embrittling intermetallic phase precipitation (sigma phase). For plate applications above 300°C, austenitic grades (321/347/310S) should be considered.

Heat Treatment Condition:
Duplex 2205 stainless steel plates 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 (sigma, chi), relieves internal stresses from rolling, and ensures maximum corrosion resistance.

Critical Note: Unlike austenitic grades (304/304L, 316/316L), Duplex 2205 requires water quenching after solution annealing. Air cooling is insufficient and will result in intermetallic phase precipitation, severely reducing corrosion resistance and toughness.

Delivery Condition:
Plates are normally supplied in solution annealed and pickled condition, providing a clean, smooth surface and excellent corrosion resistance. Pickling removes the oxide scale formed during heat treatment and restores the passive surface.

Thickness Tolerances (Hot-Rolled – ASTM A480):

Width and Length Tolerances (Hot-Rolled – ASTM A480):

Chemical Analysis: PMI 100% verification using handheld XRF spectrometer for Cr, Ni, Mo, N.

Ferrite Content Measurement: Magnetic induction (ferritoscope) or metallographic method – requirement 35–65% ferrite.

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: Thickness, width, length, flatness, squareness.

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

Ultrasonic Testing (UT): Per ASTM A435 for internal flaw detection (upon request).

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 components, module frameworks, pipe rack supports, crane pedestals, living quarters structures, helideck support structures (ABS, BV, DNV, LR certified, NORSOK M-630 compliant).

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

Seawater Systems: Intake structure panels, outfall diffuser plates, seawater pump housings, cooling water intake screens.

Desalination Plants: Brine line sections, evaporator shells, high-pressure reverse osmosis vessels, pressure vessel plates.

Chemical Processing (Chloride Service): Reactor vessels, storage tank shells, process equipment, pipe supports in high-chloride environments.

Flue Gas Desulfurization (FGD): Scrubber shells, absorber tower panels, ductwork components, slurry handling equipment.

Pulp & Paper Industry: Bleach plant vessels, digester shells, chemical recovery equipment.

Pressure Vessels: ASME code pressure vessels for chloride service, storage tanks, receivers.

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

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

Womic Steel offers precision cutting services for Duplex 2205 stainless steel plates:

Standard Packaging:

Plates wrapped with moisture-proof paper and VCI film

Edge protectors to prevent damage

Steel skids or wooden pallets for plate protection

Clear labeling with grade (S32205), heat number, dimensions, weight, ferrite content

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners – competitive freight rates

Professional loading and securing teams using padded slings prevent plate damage

Efficient document preparation (NORSOK M-630 documentation, MTR, PMI reports, ferrite measurement records) minimizes customs delays

Continuous cargo tracking and after-sales follow-up

1. Why choose Duplex 2205 over 316L for plate 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 plates?
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 and pressure vessel applications.

3. Can Duplex 2205 plates 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 plates?
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 increases.

5. Are Duplex 2205 plates suitable for pressure vessel applications?
Yes. Duplex 2205 plates can be supplied with ASME SA240 certification for pressure vessel applications. Full traceability and testing documentation included.

6. What is the standard plate size for Duplex 2205?
Standard sizes: 1500mm x 6000mm, 2000mm x 6000mm, 2000mm x 8000mm, 2500mm x 10000mm. Custom sizes available upon request.

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

ASME SA240 Certified: Pressure vessel grade plates available

Ferrite Controlled: 35-65% ferrite – documented per heat

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

Complete Size Range: Thickness from 3mm to 100mm – standard and custom sizes

Cut-to-Size Services: Plasma, waterjet, and shearing for custom dimensions

Corrosion Tested: ASTM G48 pitting corrosion test available upon request

Global Delivery: Exported to major offshore and marine projects worldwide

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 plates. We offer certified quality, NORSOK M-630 compliance, ferrite-controlled material, ASME SA240 certification, and reliable global delivery for your offshore and marine projects.

Stock Examples (Hot-Rolled Duplex 2205 Plates – No.1 Finish – Offshore Grade):

Duplex 2205 Checker Plates (Diamond Pattern – Anti-Slip):

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