Duplex 2205 Stainless Steel Coils

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.

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: Coils 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.

Comparison of PRE (Pitting Resistance Equivalent) Values:

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

Longitudinal: ≥ 60 J (typical)

Comparison of Strength (Duplex 2205 vs Austenitic Grades):

Heat Treatment Condition:
Duplex 2205 stainless steel coils 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:
Coils 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 Tolerances (Hot-Rolled – ASTM A480):

Flatness Tolerances:

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, flatness, coil ID/OD.

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 available upon customer request.

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

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

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

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

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.

Standard Packaging:

Coils wrapped with moisture-proof paper and VCI film

Outer steel strapping (4-8 straps per coil)

Wooden pallet or steel skid for coil protection

Clear labeling with grade, heat number, dimensions, weight, ferrite content

Womic Steel's Shipping Strengths:

Direct cooperation with global shipowners – competitive freight rates

Professional loading and securing teams prevent coil damage during transit

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

Rapid delivery time – standard coils maintained in ready stock

1. Why choose Duplex 2205 over 316L for coil 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 coils?
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 coils 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 coils?
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 coils suitable for sour service (H₂S environments)?
Duplex 2205 is NACE MR0175 compliant for sour service applications. For specific oil and gas applications, consult Womic Steel for NACE certification documentation.

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 coil – traceable to raw material

Complete Size Range: Thickness from 1.0mm to 12mm – standard and custom sizes

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

Stock Examples (Hot-Rolled Duplex 2205 Coils – Annealed & Pickled – Offshore Grade):

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