2207 Stainless Steel Hot Rolled Plate Super Duplex Grade For Extreme Environments
Duplex 2205 stainless steel plate is a nitrogen-enhanced duplex stainless steel grade characterized by a balanced austenitic-ferritic microstructure (approximately 50% austenite / 50% ferrite). This unique dual-phase structure delivers approximately twice the yield strength of standard austenitic grades like 304L or 316L, combined with excellent resistance to chloride stress corrosion cracking (SCC), pitting, and crevice corrosion.
Duplex 2205 is the most widely used duplex stainless steel grade, serving as the standard choice for applications requiring both high strength and superior corrosion resistance in chloride-containing environments.
| Feature | Description |
|---|---|
| Microstructure | Austenitic + Ferritic (≈50/50 dual-phase) |
| Yield Strength | ≥450 MPa (~2* stronger than 316L) |
| PREN | ≥35 (excellent pitting resistance) |
| Corrosion Resistance | Superior against SCC, pitting, and crevice corrosion |
| Temperature Range | -50°F to 600°F (-46°C to 316°C) continuous service |
| Magnetic | Yes (due to ferrite phase) |
| Weldability | Good, with proper procedures |
| Standard | Grade |
|---|---|
| ASTM | UNS S32205 / S31803 |
| EN | 1.4462 |
| AISI | 2205 |
| JIS | SUS329J3L |
| DIN | X2CrNiMoN22-5-3 |
| ISO | 2205 |
| Parameter | Range |
|---|---|
| Thickness | 0.3 mm – 100 mm (custom up to 200 mm available) |
| Width | 50 mm – 3500 mm |
| Length | 1000 mm – 12000 mm (custom available) |
| Standard Coil Widths | 1000 mm, 1219 mm, 1240 mm, 1500 mm, 2000 mm |
| Standard | ASTM A240 / A480, ASME SA240, EN 10088-2, JIS G4304/G4305 |
| Finish | Code | Characteristics | Application |
|---|---|---|---|
| No.1 | Hot rolled, annealed & pickled | Original industrial surface | Pressure vessels, industrial equipment |
| 2B | Cold rolled, bright finish | Smooth, reflective | General fabrication, tanks |
| BA | Bright annealed | Mirror-like reflectivity | Decorative applications |
| No.4 | Brushed | Matte, fine satin finish | Architectural, food processing |
| HL | Hairline | Continuous linear streaks | Building facades, elevators |
| 8K | Mirror | Highly reflective | Luxury decorative finishes |
| Element | UNS S32205 (%) | UNS S31803 (%) |
|---|---|---|
| Carbon (C) | ≤0.030 | ≤0.030 |
| Chromium (Cr) | 22.0 – 23.0 | 21.0 – 23.0 |
| Nickel (Ni) | 5.5 – 6.5 | 4.5 – 6.5 |
| Molybdenum (Mo) | 3.0 – 3.5 | 2.5 – 3.5 |
| Manganese (Mn) | ≤1.20 | ≤2.00 |
| Silicon (Si) | ≤0.80 | ≤1.00 |
| Nitrogen (N) | 0.14 – 0.20 | 0.08 – 0.20 |
| Phosphorus (P) | ≤0.030 | ≤0.030 |
| Sulfur (S) | ≤0.020 | ≤0.020 |
| Iron (Fe) | Balance | Balance |
Note: UNS S32205 is the preferred modern specification with tighter chromium, molybdenum, and nitrogen ranges for improved consistency.
PREN (Pitting Resistance Equivalent Number) = %Cr + 3.3*%Mo + 16*%N ≈ 35
| Property | Value |
|---|---|
| Tensile Strength (min) | ≥620 MPa (90 ksi) |
| Yield Strength (0.2% offset, min) | ≥450 MPa (65 ksi) |
| Elongation (min) | 25% |
| Hardness (max) | 290 HB / 30 HRC |
| Density | 7.8 g/cm³ (0.283 lb/in³) |
| Modulus of Elasticity | 200 GPa (29.0 * 10⁶ psi) |
| Melting Point | 1425 – 1460°C (2597 – 2660°F) |
| Impact Strength (min) | 100 J at -46°C |
| Property | Value |
|---|---|
| Coefficient of Thermal Expansion (20-200°C) | 13.5 * 10⁻⁶ /°C |
| Thermal Conductivity (20°C) | 19.0 W/m·K |
| Specific Heat (20°C) | 500 J/kg·K |
| Electrical Resistivity (20°C) | 0.80 μΩ·m |
| Corrosion Type | Performance |
|---|---|
| Pitting / Crevice | PREN ≥35 → excellent resistance in chloride environments; far superior to 304/316 |
| Stress Corrosion Cracking (SCC) | Highly resistant to chloride and H₂S environments; NACE MR0175 compliant for sour service |
| General Corrosion | Superior to 304/316 in organic acids (formic, acetic) and dilute sulfuric acid |
| Intergranular Corrosion | Low carbon content prevents sensitization |
| Seawater Resistance | Excellent; widely used in seawater systems with proper design |
Temperature range: 1750 – 2050°F (950 – 1120°C), followed by rapid cooling (water quenching). Avoid working below 1700°F (925°C).
Requires approximately 30-50% higher forming force compared to 316L. Intermediate annealing may be required for severe deformation.
-
Solution Annealing: 1870 – 2010°F (1020 – 1100°C)
-
Cooling: Water quench or rapid air cool
-
Hardening: Not hardenable by heat treatment; only through cold working
-
Suitable with standard methods (SMAW, GTAW, GMAW, SAW, FCAW)
-
Recommended filler metal: 2209 (E2209 or ER2209)
-
Control heat input (0.5 – 2.5 kJ/mm) to maintain phase balance
-
Preheat is generally not required
-
Post-weld heat treatment is not typically needed
-
Avoid overheating to prevent intermetallic phase precipitation
Requires rigid tooling and lower cutting speeds due to higher strength and work hardening tendency compared to austenitic grades.
Get a fast, accurate quote for Duplex 2205 Stainless Steel Plates tailored to your project requirements.
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.