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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.
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 | — |
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
Oil & Gas
Marine
Pharmaceutical
Heat Exchangers
Power Plants
WHY CHOOSE US?
FAQ’s – Duplex Stainless Steel S31803
What is Duplex Stainless Steel S31803?
It is a duplex (austenitic + ferritic) stainless steel offering high strength and excellent corrosion resistance.
How is S31803 different from 316L?
S31803 has:
- Higher strength
- Better chloride resistance
- Higher pitting resistance (PREN ≥ 35)
What industries use Duplex S31803?
Oil & gas, marine, chemical plants, desalination, pulp & paper, structural applications.
What products do you supply in S31803?
Pipes, tubes, sheets, plates, coils, bars, fittings, flanges, fasteners & custom components.
Is S31803 weldable?
Yes. It has good weldability but requires controlled heat input to avoid sigma phase.
Contact Us
For inquiries, pricing, or customized Duplex Stainless Steel S31803 solutions, Moksh Tubes & Fittings LLP your reliable partner in Duplex Stainless Steel S31803.
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