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Duplex Steel S32205 Sheet & Plate is a highly versatile and durable alloy known for its exceptional combination of strength, corrosion resistance, and weldability. It belongs to the duplex family of stainless steels, which have a mixed microstructure of austenite and ferrite, providing superior performance compared to standard austenitic grades like 304 or 316. This grade is widely recognized as an engineering solution for demanding environments where high mechanical strength and corrosion resistance are essential.
UNS S32205 Duplex Steel is often referred to as Duplex 2205 due to its approximate 22% chromium and 5% nickel content. This chemical balance provides outstanding resistance to stress corrosion cracking, pitting, and crevice corrosion, especially in chloride-containing environments. The sheets and plates are often used in marine, offshore, and chemical processing industries due to their proven reliability and longevity in harsh conditions.
The corrosion resistance of Duplex Steel S32205 is one of its standout features. It performs exceptionally well in environments exposed to chlorides, sulfides, and acidic media. The alloy’s balanced composition ensures a strong protective oxide layer, reducing the risk of localized attack. This makes it an excellent material choice for heat exchangers, desalination plants, pressure vessels, and pipelines carrying corrosive fluids.
Mechanical strength is another major advantage of Duplex S32205. With nearly double the yield strength of conventional stainless steels, it allows engineers and designers to use thinner gauges without compromising structural integrity. This leads to significant weight and cost savings, particularly in large-scale fabrications and transportation equipment.
Fabrication and welding of Duplex S32205 sheets and plates are straightforward with proper techniques. The alloy can be welded using standard methods such as TIG, MIG, and SMAW, though maintaining appropriate heat input and interpass temperature is crucial to prevent phase imbalance. It can also be easily machined, formed, and cut using conventional tools, making it adaptable for a wide range of industrial applications.
Heat treatment and microstructure play key roles in maintaining the duplex balance between ferrite and austenite phases. Solution annealing between 1020°C and 1100°C followed by rapid quenching in water or air helps restore the optimal duplex structure. This process ensures that the alloy retains its high mechanical properties and corrosion resistance after fabrication.
Applications of Duplex Steel S32205 Sheet & Plate include offshore platforms, oil and gas refining, heat exchangers, desalination systems, and pulp & paper manufacturing. The combination of high strength, corrosion resistance, and good fatigue performance makes it suitable for environments where other materials would fail due to stress cracking or pitting corrosion.
Standards and specifications for Duplex S32205 sheets and plates include ASTM A240, ASME SA240, EN 1.4462, and UNS S32205. These standards ensure consistent quality and dimensional accuracy across all product forms. Sheets and plates are available in various thicknesses, widths, and surface finishes such as No.1, 2B, BA, and brushed, depending on the application requirements.
Advantages of Duplex S32205 over conventional stainless steels are numerous. It provides an ideal balance between toughness and strength, superior resistance to corrosion, and reduced thermal expansion. It is also more cost-effective than higher nickel alloys, offering long-term performance benefits in aggressive industrial environments while keeping material costs reasonable.
Specification Table
| Standard | Grade | UNS | Werkstoff Nr. | Density (g/cm³) | Melting Point (°C) | Form |
|---|---|---|---|---|---|---|
| ASTM A240 / ASME SA240 | Duplex 2205 / S32205 | UNS S32205 | 1.4462 | 7.8 | 1350 – 1450 | Sheet, Plate, Coil |
Chemical Composition (Typical ranges for SS202)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Min (%) | Max (%) |
|---|---|---|
| Carbon (C) | 0.03 | 0.03 |
| Manganese (Mn) | 1.0 | 2.0 |
| Silicon (Si) | 0.5 | 1.0 |
| Chromium (Cr) | 21.0 | 23.0 |
| Nickel (Ni) | 4.5 | 6.5 |
| Molybdenum (Mo) | 2.5 | 3.5 |
| Nitrogen (N) | 0.08 | 0.20 |
| Iron (Fe) | Balance | - |
| Copper (Cu) | - | 0.5 |
Mechanical Properties (Typical)
| Property | Value | Unit | Condition |
|---|---|---|---|
| Yield Strength (0.2% offset) | 450 – 550 | MPa | Annealed |
| Tensile Strength | 620 – 780 | MPa | Annealed |
| Elongation | 25 – 35 | % | Annealed |
| Hardness (Brinell) | < 290 | HB | Annealed |
| Impact Toughness (Charpy V-Notch) | 60 – 150 | J | Room Temp |
Equivalent Grades
| Standard | Grade / Designation | UNS | EN / Werkstoff Nr. | Other Designations |
|---|---|---|---|---|
| ASTM / ASME | Duplex 2205 / S32205 | S32205 | 1.4462 | UNS S31803 (similar), EN 1.4462 |
| ISO | X2CrNiMoN22-5-3 | - | 1.4462 | - |
| JIS | SUS329J3L | - | - | - |
| GB / Chinese Standard | 06Cr22Ni5Mo3N | - | - | - |
Dimension & Weight Chart (Selected common sizes)
Below is a representative chart showing outside diameter, wall thickness, inside diameter, cross-sectional area of metal and calculated weight per metre (kg/m). Values are calculated using density = 7.93 g/cm³ and are for guidance — use actual MTC values for procurement & engineering.
| Thickness (mm) | Width (mm) | Length (mm) | Weight per Sheet (kg) | Remarks |
|---|---|---|---|---|
| 1.0 – 3.0 | 1000 – 1500 | 2000 – 6000 | 7 – 35 | Standard sheet sizes |
| 4.0 – 6.0 | 1000 – 1500 | 2000 – 6000 | 35 – 90 | Plate thicknesses |
| 8.0 – 12.0 | 1000 – 2000 | 2000 – 6000 | 90 – 180 | Heavy plates |
| 15.0 – 25.0 | 1500 – 2000 | 2500 – 6000 | 180 – 400 | Extra thick plates |
Common Types Of Sheets
Shim Sheet
Perforated Sheet
Chequered Plate
Coil
Strips
Foil
Hot Rolled Sheets
Cold Rolled Plate
Matt PVC Sheet
Frequently Asked Questions (FAQ)
What is Duplex Steel S32205?
Duplex Steel S32205, also known as Duplex 2205, is a two-phase stainless steel with a mixed microstructure of austenite and ferrite. It offers high strength, excellent corrosion resistance, and good weldability.
What are the typical applications of S32205 Duplex Steel?
S32205 is commonly used in chemical processing, oil & gas, desalination plants, marine environments, and pulp & paper industries due to its high resistance to chloride stress corrosion cracking.
What forms are available for Duplex Steel S32205?
It is available in sheets, plates, and coils. Custom cut sizes can also be supplied depending on the project requirements.
What is the chemical composition of Duplex Steel S32205?
The typical composition includes 21–23% Chromium (Cr), 4.5–6.5% Nickel (Ni), 2.5–3.5% Molybdenum (Mo), 0.08–0.20% Nitrogen (N), 1–2% Manganese (Mn), 0.5–1% Silicon (Si), 0.03% Carbon (C), with iron (Fe) as the balance.
What are the mechanical properties of S32205?
Duplex S32205 has a yield strength of 450–550 MPa, tensile strength of 620–780 MPa, elongation of 25–35%, and Brinell hardness below 290 HB in the annealed condition.
Sheets & Plates Supplier
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