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Duplex Steel S31803 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 S31803 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 S31803 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 S31803. 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 S31803 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 S31803 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 S31803 sheets and plates include ASTM A240, ASME SA240, EN 1.4462, and UNS S31803. 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 S31803 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
| Specification | Details |
|---|---|
| Grade | Duplex Steel S31803 / UNS S31803 / Duplex 2205 |
| Standard | ASTM A240 / ASME SA240 |
| Equivalent Material | EN 1.4462 / X2CrNiMoN22-5-3 |
| Thickness | 0.3 mm to 120 mm |
| Width | 1000 mm to 2500 mm |
| Length | 2000 mm to 6000 mm (Custom Cut Lengths Available) |
| Surface Finish | No.1, 2B, BA, No.4, Hairline, Mirror, Matte Finish |
| Type | Hot Rolled Plate, Cold Rolled Sheet, Coil, Shim Sheet, Perforated Sheet, Chequered Plate |
| Form | Sheet, Plate, Coil, Strip, Blank, Circle, Ring |
| Certification | EN 10204 3.1 / 3.2 Mill Test Certificate, NABL Approved Test Reports |
| Applications | Oil & Gas, Petrochemical, Desalination Plants, Marine, Pulp & Paper, Heat Exchangers, Chemical Processing |
Chemical Composition (Typical ranges for SS202)
Note: Values are typical ranges. Final composition will be confirmed on MTC provided per lot.
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 21.0 – 23.0 |
| Nickel (Ni) | 4.5 – 6.5 |
| Molybdenum (Mo) | 2.5 – 3.5 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Carbon (C) | ≤ 0.030 |
| Phosphorus (P) | ≤ 0.030 |
| Sulfur (S) | ≤ 0.020 |
| Nitrogen (N) | 0.08 – 0.20 |
| Iron (Fe) | Balance |
Mechanical Properties (Typical)
| Property | Metric | Imperial |
|---|---|---|
| Tensile Strength | 620 MPa min | 89,900 psi min |
| Yield Strength (0.2% Proof) | 450 MPa min | 65,300 psi min |
| Elongation | 25% min | 25% min |
| Hardness (Brinell) | ≤ 290 HB | ≤ 290 HB |
| Modulus of Elasticity | 200 GPa | 29,000 ksi |
| Density | 7.8 g/cm³ | 0.281 lb/in³ |
| Melting Range | 1350 – 1450°C | 2460 – 2640°F |
| Impact Toughness (Charpy V-Notch at Room Temp) | ≥ 100 J | ≥ 74 ft·lb |
Equivalent Grades
| STANDARD | GRADE |
|---|---|
| UNS | S31803 |
| EN / DIN | 1.4462 / X2CrNiMoN22-5-3 |
| AFNOR | Z2CND22-05Az |
| BS | 318S13 |
| JIS | SUS 329J3L |
| GOST | 08Х22Н6Т |
| ASTM / ASME | A240 / SA240 |
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) | Size (mm) | Weight (kg/m²) |
|---|---|---|
| 1.0 | 1000 x 2000 | 7.85 |
| 1.5 | 1250 x 2500 | 11.78 |
| 2.0 | 1250 x 2500 | 15.70 |
| 3.0 | 1500 x 3000 | 23.55 |
| 4.0 | 1500 x 3000 | 31.40 |
| 5.0 | 1500 x 3000 | 39.25 |
| 6.0 | 1500 x 3000 | 47.10 |
| 8.0 | 1500 x 3000 | 62.80 |
| 10.0 | 1500 x 3000 | 78.50 |
| 12.0 | 1500 x 3000 | 94.20 |
| 16.0 | 1500 x 6000 | 125.60 |
| 20.0 | 1500 x 6000 | 157.00 |
| 25.0 | 1500 x 6000 | 196.25 |
| 30.0 | 2000 x 6000 | 282.60 |
| 40.0 | 2000 x 6000 | 376.80 |
| 50.0 | 2000 x 6000 | 471.00 |
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 S31803 Sheet & Plate?
Duplex Steel S31803 Sheet & Plate, also known as Duplex 2205, is a two-phase stainless steel consisting of austenitic and ferritic microstructures. It offers excellent mechanical strength and superior resistance to corrosion, pitting, and stress corrosion cracking compared to conventional stainless steels like 304 or 316.
What are the main features of Duplex Steel S31803?
The key features include high tensile and yield strength, excellent corrosion resistance in chloride and acidic environments, good weldability, low thermal expansion, and outstanding fatigue strength. These characteristics make it ideal for heavy-duty and corrosive applications.
Where is Duplex Steel S31803 used?
Duplex Steel S31803 is widely used in the oil & gas industry, chemical processing plants, desalination units, marine environments, paper and pulp industries, and heat exchangers. It is also used in structural applications that demand both strength and corrosion resistance.
How does Duplex S31803 differ from Super Duplex S32750 or S32760?
Duplex S31803 offers excellent strength and corrosion resistance but slightly lower than Super Duplex grades such as S32750 or S32760. Super Duplex steels contain higher levels of chromium, molybdenum, and nitrogen, providing enhanced resistance to pitting and crevice corrosion in extremely aggressive environments.
What standards cover Duplex Steel S31803 Sheets & Plates?
These sheets and plates are produced under international standards such as ASTM A240, ASME SA240, EN 1.4462, and UNS S31803. These standards ensure consistent mechanical properties, dimensional accuracy, and corrosion resistance across all product forms.
Sheets & Plates Supplier
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