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Super Duplex S31803 | Product Overview
Introduction To Duplex Stainless Steel S31803
Duplex Stainless Steel S31803 (commonly known as 2205 Duplex) is a ferritic austenitic stainless steel designed for industries that need high strength, chloride resistance, and long-term durability.
It contains approximately 22% Chromium, 5–6% Nickel, 3% Molybdenum, and Nitrogen, which boosts its pitting, crevice, and stress corrosion cracking resistance far beyond conventional stainless steels like 304 and 316.
At Moksh Tubes & Fittings LLP, we supply S31803 in multiple forms including pipes, tubes, sheets, plates, coils, bars, fittings, flanges, and custom-forged components.
With its superior mechanical strength, Duplex S31803 is used in oil & gas, desalination, marine engineering, chemical processing, pulp & paper, and structural applications. All materials are supplied with EN 10204 3.1 / 3.2 MTC, ensuring complete traceability and compliance.
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Duplex Stainless Steel S31803 Specifications
| Category | Details |
|---|---|
| Grade | Duplex S31803 / UNS S31803 / 2205 / EN 1.4462 |
| Type | Duplex Stainless Steel (Austenitic–Ferritic) |
| Typical Chemical Composition | 22% Cr, 5–6% Ni, 3% Mo, 0.14–0.20% N |
| Conditions | Annealed, Solution Annealed, Hot Rolled, Cold Worked |
| Heat Treatment | Solution Annealing |
| Testing | Tensile, Hardness, Microstructure, PMI, UT, IGC |
| Certification | EN 10204 3.1 / 3.2 |
Chemical Composition of Duplex Stainless Steel S31803
| Element | Content (%) |
|---|---|
| Carbon (C) | 0.03 |
| Manganese (Mn) | 2.00 |
| Silicon (Si) | 1.00 |
| 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 |
Duplex S31803 achieves its strength and corrosion resistance through a balanced 50/50 ferrite–austenite microstructure.
Technical Composition of Duplex S31803
Physical Properties of Duplex S31803
| Property | Metric | Imperial |
|---|---|---|
| Density | 7.80 g/cm³ | 0.281 lb/in³ |
| Elastic Modulus | 200 GPa | 29,000 ksi |
| Shear Modulus | 77 GPa | 11,200 ksi |
| Melting Range | 1350–1450°C | 2460–2640°F |
| Thermal Conductivity | 19 W/m·K | – |
| Electrical Resistivity | 0.90 µΩ·m | – |
| Specific Heat | 480 J/kg·K | – |
Duplex S31803 has double the strength of 304/316 stainless steel and significantly higher pitting resistance.
Heat Treatment of Duplex Stainless Steel S31803
| Heat Treatment Process | Temperature (°C) | Cooling Method |
|---|---|---|
| Solution Annealing | 1020–1100°C | Rapid water quenching |
| Stress Relieving | 300–350°C | Air cool |
| Hot Working | 950–1200°C | Water quench after forming |
⚠ Important: Duplex steels must be cooled quickly after heat treatment to prevent formation of sigma phase, which reduces corrosion resistance.
Mechanical Properties of Duplex Stainless Steel S31803
| Property | Metric Value | Notes |
|---|---|---|
| Tensile Strength (UTS) | 620 MPa | High strength due to duplex microstructure |
| Yield Strength (0.2% Proof) | 450 MPa | Typically higher than austenitic stainless steels (304/316) |
| Elongation (in 50 mm) | 25–30% | Good ductility |
| Hardness (Brinell, HBW) | 293 HB | Maximum allowable hardness |
| Hardness (Rockwell C) | 30 HRC max | Conversion from Brinell |
| Impact Toughness (Charpy V-notch) | 80 J at room temp | Excellent toughness |
| Modulus of Elasticity | 200 GPa | Similar to stainless steels |
| Poisson’s Ratio | 0.3 | Typical for steels |
| Density | 7.80 g/cm³ | — |
| Melting Range | 1350–1450°C | — |
International Standards & Equivalent Grades
| Standard | Equivalent Grade |
|---|---|
| UNS | S31803, S32205 |
| EN | 1.4462 |
| ASTM | A182 F51, A240 2205, A479 |
| WNR | 1.4462 |
| JIS | SUS 329J3L |
| ISO | 31803 |
Products in Duplex Stainless Steel S31803
Duplex Stainless Steel S31803 is available in a variety of mill forms:
✔
Seamless Pipes
✔
Welded Pipes (ERW & EFW)
✔
Tubes (Capillary, U-Bend)
✔
Sheets & Plates
✔
Coils & Strips
✔
Round Bars, Flat Bars, Hex Bars, Square Bars
✔
Pipe Fittings (Elbows, Tees, Reducers, Caps, Stub Ends)
✔
Flanges (Weld Neck, Slip-On, Blind, Socket Weld, Threaded)
✔
Fasteners (Bolts, Nuts, Screws, Washers, Studs)
✔
Custom Fabricated Components
We supply Duplex Stainless Steel S31803 materials in accordance with the most stringent industry standards:
Uses and Advantages
Excellent resistance to chloride-induced stress corrosion cracking
Superior pitting and crevice corrosion resistance compared to austenitic stainless steels
Twice the yield strength of conventional austenitic stainless steels
Good weldability and formability
Durable performance in harsh environments
Cost effective solution for many demanding applications
Applications of Duplex Stainless Steel S31803
Duplex Stainless Steel S31803 is widely used across multiple industries due to its excellent strength, corrosion resistance, and machinability:
Chemical Processing
Reactors, heat exchangers, and piping systems for chemical processing equipment.
Oil & Gas Industry
Subsea equipment, risers, and pipelines for oil & gas applications.
Marine Engineering
Seawater systems and offshore structures with high corrosion resistance.
Desalination Plants
Equipment used in desalination plants operating in saline environments.
Pulp & Paper Industry
Machinery and piping used in pulp and paper production processes.
Pressure Vessels & Storage Tanks
Vessels and tanks used in corrosive conditions for safe storage and processing.
WHY CHOOSE US?
Duplex Stainless Steel S31803 Price per kg in India
Typical Range: ₹350 – ₹850 per kg
(Price varies by OD, wall thickness, form, and finish)
Contact us for exact quotation based on size and quantity.
FAQ's
What is Duplex Stainless Steel S31803 used for?
It is widely used in chemical processing, marine engineering, desalination, and oil & gas applications.
Is Duplex S31803 weldable?
Yes, but proper welding procedures and post-weld heat treatment are recommended for maintaining optimum corrosion resistance and mechanical strength.
Can S31803 be used in seawater environments?
Yes, it provides excellent seawater corrosion resistance but is slightly less resistant than Super Duplex grades.
How does S31803 compare to 2205?
S31803 is more cost-effective for general use but offers slightly lower corrosion resistance compared to Super Duplex 2205.
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