Overview
Grade S31803 / 2205 / 1.4462 Duplex Stainless Steel is a high-strength, corrosion-resistant stainless steel widely used in demanding industrial environments. Its dual-phase microstructure, consisting of approximately equal proportions of austenite and ferrite, provides an excellent combination of mechanical strength, toughness and corrosion resistance.
With a high chromium, molybdenum and nitrogen content, Duplex 2205 offers excellent resistance to pitting, crevice corrosion and chloride-induced stress corrosion cracking. Its high yield strength, approximately twice that of conventional austenitic stainless steels such as 304 and 316, makes it particularly suitable for applications where strength, durability and resistance to aggressive environments are essential.
Form of Supply
• Duplex 2205 Sheet
• Duplex 2205 Plate
• Duplex 2205 Round Bar
• Duplex 2205 Wire
• Duplex 2205 Tube & Pipe
Nationwide Stainless is an independent UK stainless steel stockholder and processor, supplying specialist stainless steel materials to a wide range of industries. With extensive processing capabilities, we can assist with standard material requirements and custom-processed products.
Depending on availability, we can offer stock-size plate and sheet, stock-length round bar, cut-to-size plate and sheet, cut-to-length round bar, forming and additional machining services to meet individual project requirements.
Please send any enquiries to sales@nationwidestainless.co.uk
Applications
• Offshore Oil & Gas Equipment
• Chemical Processing Equipment
• Pressure Vessels
• Heat Exchangers
• Storage Tanks
• Process Pipework
• Pumps & Valves
• Marine Components
• Desalination Equipment
• Water Treatment Systems
• Pulp & Paper Processing Equipment
• Structural Components
• Petrochemical Equipment
• Flanges & Fittings
• Industrial Processing Equipment
Corrosion Resistance
S31803 / 2205 / 1.4462 Duplex Stainless Steel offers excellent corrosion resistance in a wide range of industrial environments. Its high chromium, molybdenum and nitrogen content provides strong resistance to general corrosion, pitting and crevice corrosion, particularly in environments containing chlorides.
The duplex microstructure also provides significantly improved resistance to chloride-induced stress corrosion cracking compared with conventional austenitic stainless steels such as 304 and 316. This makes Duplex 2205 particularly suitable for chemical processing, offshore, marine and water treatment applications where corrosion resistance and mechanical strength are important.
However, corrosion performance depends on operating temperature, chloride concentration and the presence of other corrosive substances. Duplex 2205 is not generally recommended for prolonged exposure to temperatures above approximately 300°C, as elevated temperatures can affect its microstructure and mechanical properties.
Typical Analysis
Chemical composition (%), UNS S31803 specification limits.
S31803 | Cr% | Ni% | C% | Si% | Mn% | P% | S% | Mo% | N% |
|---|---|---|---|---|---|---|---|---|---|
MIN | 21.0 | 4.5 | - | - | - | - | - | 2.5 | 0.08 |
MAX | 23.0 | 6.5 | 0.030 | 1.00 | 2.00 | 0.030 | 0.020 | 3.5 | 0.20 |
Iron (Fe) forms the balance of the composition.
Mechanical Properties
The properties quoted below are guideline figures only and should not be used for any design purposes.
Minimum room-temperature mechanical properties for UNS S31803 flat-rolled products, with maximum hardness values.
Property | Value |
|---|---|
Tensile Strength (N/mm²) | 620 minimum |
0.2% Proof Strength (N/mm²) | 450 minimum |
Elongation (%) | 25 minimum |
Hardness (HB) | 293 maximum |
Hardness (HRC) | 31 maximum |
Related Specs & Trade Names
S31803, Duplex 2205, 2205 Stainless Steel, 1.4462, UNS S31803, UNS S32205, X2CrNiMoN22-5-3, EN 10088, ASTM A240, ASTM A276, ASTM A790, ASTM A182 F51, ASTM A182 F60, Duplex Stainless Steel.
Other Specifications
• 253MA Stainless Steel
• 310/310S Stainless Steel
• 316/316L Stainless Steel
• 304/304L Stainless Steel
