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| Grade | Code | UNS | Duplex Stainless Steel |
| 1.4462 / Duplex 2205 | X2CrNiMoN22-5-3 | UNS S31803/ UNS S32205 |
1.4462 / Duplex 2205 is a duplex stainless steel grade with a balanced austenitic-ferritic structure. It stands out for its high mechanical strength, resistance to chloride-induced stress corrosion cracking and good weldability. Its yield strength is approximately twice that of conventional austenitic stainless steels, while its two-phase structure requires greater care during machining.
| C % | Si % | Mn % | P % | S % | Cr % | Ni % | Mo % | N % | Fe % |
| ≤ 0.03 | ≤ 1.00 | ≤ 2.00 | ≤ 0.035 | ≤ 0.015 | 21.00–23.00 | 4.50–6.50 | 2.50–3.50 | 0.10–0.22 | Bal. |
| Form | Rp0.2 [MPa] | Rm [MPa] | Elong. [%] | Hardness [HB] | Density [g/cm³] |
| Bar | ≥ 450 | 650–880 | ≥ 25 | ≤ 270 | 7.80 |
| Plate | ≥ 460 | 640–840 | ≥ 25 | ≤ 293* | 7.80 |
| Sheet | ≥ 500 | 700–950 | ≥ 20 | ≤ 293* | 7.80 |
| Tube | ≥ 450 | 640–880 | ≥ 22 | ≤ 290* | 7.80 |
*As EN 10088-2 and EN 10216-5 do not specify a Brinell hardness limit for these products, the hardness values correspond to ASTM A240 for plate/sheet and ASTM A789 for tube.
| Sector | Most Common Products |
| Oil and gas | Process piping, separators, manifolds |
| Chemical & petrochemical | Reactors, storage tanks, heat exchangers |
| Marine & shipbuilding | Rudder stocks, seawater piping, deck equipment |
| Offshore facilities | Pipelines, pressure vessels, structural platform parts |
| Pulp & paper | Digesters, white liquor tanks, washing equipment |
| Water & desalination | Filter housings, high-pressure piping, pumps |
| Energy & environment | Flue-gas units, cooling-water piping, heat exchangers |
| Food & beverage | Process tanks, production piping, agitator shafts |
| Construction & infrastructure | Bridge parts, reinforcing bars, fasteners |
| Machinery manufacturing | Pump shafts, valve bodies, flanges |
| Mining & mineral processing | Slurry piping, screening equipment, process tanks |
1.4462 / Duplex 2205 has good weldability and can be joined using TIG, MIG/MAG, shielded metal arc welding and submerged arc welding processes. Preheating is generally not applied before welding, nor is stress-relief treatment applied after welding; however, heat input and interpass temperature must be controlled to preserve the phase balance. It can be cold formed, but its high strength requires greater forming force and allowance for springback than 304L and 316L. Its machinability is lower than that of austenitic stainless steels; rigid machinery, sharp tools, continuous feed and adequate cooling should be used. It cannot be hardened by heat treatment; solution annealing followed by rapid cooling is applied to restore structural balance and corrosion resistance. Due to its ferrite-containing structure, it exhibits magnetic properties.
1.4462, F51, X2CrNiMoN22-5-3, UNS S31803, UNS S32205
| Form | ASTM | DIN / EN |
| Bar | ASTM A276/A276M, ASTM A479/A479M | DIN EN 10088-3, DIN EN 10272 |
| Plate | ASTM A240/A240M | DIN EN 10088-2, DIN EN 10028-7 |
| Sheet | ASTM A240/A240M | DIN EN 10088-2, DIN EN 10028-7 |
| Tube | ASTM A789/A789M, ASTM A790/A790M | DIN EN 10216-5, DIN EN 10217-7 |
1.4410 – Super Duplex 2507: Offers higher mechanical strength and resistance to chloride corrosion.
1.4501 – Super Duplex: May be preferred in aggressive environments requiring higher corrosion resistance than 1.4462.
1.4460 – Duplex: A closer alternative in terms of mechanical properties and duplex structure, but with lower corrosion resistance.
Acerinox – ACX 900 / EN 1.4462
Note: The information contained in this datasheet is for informational purposes only; no liability is accepted.
