Product Information: 2205 Duplex Stainless Steel Plate

Material Grade: UNS S32205 / EN 1.4462 / F51 / F60

Overview:

2205 is a premium ferritic-austenitic (duplex) stainless steel characterized by an excellent combination of high strength and outstanding corrosion resistance. Its microstructure, comprising approximately 50% ferrite and 50% austenite, delivers superior performance compared to standard austenitic grades (like 304 or 316) in demanding environments.

Key Advantages:

• Exceptional Strength: Delivers roughly twice the yield strength of standard austenitic stainless steels (304, 316), allowing for thinner sections, reduced weight, and potential cost savings.

• Superior Corrosion Resistance: Offers excellent resistance to:

  • Stress Corrosion Cracking (SCC)

  • Pitting and Crevice Corrosion (high PREN >34: PREN = %Cr + 3.3x%Mo + 16x%N)

  • General corrosion in acids and chlorides

  • Corrosion fatigue and erosion corrosion

• Good Weldability: Readily weldable using common techniques (recommended filler: 2209).

• High Toughness & Ductility: Maintains good impact toughness down to low temperatures.

• Favorable Thermal Conductivity & Low Thermal Expansion: Intermediate values between carbon steel and austenitic stainless steels.

Typical Chemical Composition (Weight %):

Typical Mechanical Properties (at Room Temperature):

Physical Properties:

• Density: 7.8 g/cm³ (0.282 lb/in³)

• Melting Range: 1380 - 1440 °C (2516 - 2624 °F)

• Modulus of Elasticity: 200 GPa (29 x 10⁶ psi)

• Thermal Expansion (20-100°C): 13.0 µm/m·°C (7.2 µin/in·°F)

• Thermal Conductivity (20°C): 19 W/m·K (13.1 Btu·in/ft²·h·°F)

• Electrical Resistivity: 0.80 µΩ·m

Available Forms & Sizes:

• Thickness: Typically 0.5mm (0.020") up to 100mm (4") or more (subject to mill capability).

• Width: Up to 3000mm (120") or wider (coil/plate).

• Length: Standard mill lengths (e.g., 3000mm, 6000mm, 120") or custom cut-to-length.

• Surface Finish: Standard Mill Finish (Hot Rolled Annealed & Pickled, or Cold Rolled Annealed & Pickled/Descaled), No. 1, 2B, BA, Polished (various grits), or as required.

Standards & Specifications:

• ASTM A240/A240M (Pressure Vessels & General Application)

• ASME SA-240

• EN 10088-2

• Other international equivalents available upon request.

Key Applications:

2205 duplex plate is ideal for demanding environments where high strength and corrosion resistance are critical:

• Chemical & Petrochemical Processing: Pressure vessels, heat exchangers, reactors, piping, tanks (acids, chlorides).

• Oil & Gas: Offshore platforms, downhole tubing, flowlines, separators, valves (sour service resistant).

• Pulp & Paper: Digesters, bleach plants.

• Desalination & Water Treatment: RO membranes, evaporators, piping.

• Marine & Shipbuilding: Seawater piping, prop shafts, exhaust scrubbers.

• Energy: Flue gas desulfurization (FGD) systems, geothermal plants.

• Structural: Bridges, buildings in corrosive atmospheres.

• Food & Pharmaceutical: High-pressure/high-temperature processing equipment.

Processing Considerations:

• Cutting: Plasma, laser, waterjet, or mechanical methods are suitable. Avoid carbon steel contamination.

• Forming: Requires higher forces than austenitic grades. Minimum bend radii are larger; consult forming guidelines.

• Welding: Readily weldable using TIG, MIG, SAW, or Stick processes. Use matching duplex filler metal (e.g., ER2209 / E2209-xx). Control heat input and interpass temperature (typically max 150°C / 300°F) to maintain corrosion resistance and toughness. Post-weld heat treatment is generally not required for thin sections.

• Machining: Tougher than austenitics; requires rigid setups, positive rake tools, adequate cooling, and lower speeds/higher feeds.

Why Choose 2205 Duplex Plate?

• Cost Efficiency: Achieve the required strength and corrosion resistance with potentially less material thickness compared to 316L or 317L.

• Long Service Life: Exceptional resistance to localized corrosion and SCC extends component lifespan in harsh conditions.

• Design Flexibility: High strength enables lighter, more innovative designs.