MATERIALS & PROPERTIES ·
Duplex 1.4462 stainless steel: properties, corrosion resistance and applications
Duplex 1.4462 is a stainless steel with an austenitic-ferritic microstructure that combines high mechanical strength with good corrosion resistance, particularly in many chloride-containing environments. It is a material worth evaluating for industrial components and fasteners used in applications where both properties are essential.
What is Duplex 1.4462 stainless steel?
Duplex 1.4462 belongs to the family of austenitic-ferritic stainless steels, characterized by a microstructure consisting of two phases: austenite and ferrite.
The principal designations used internationally are:
| Designation | Identification |
|---|---|
| European material number | EN 1.4462 |
| EN steel designation | X2CrNiMoN22-5-3 |
| Common commercial designation | Duplex 2205 |
| Designation according to the American reference table | AISI 329A (F51) |
Its approximate composition includes chromium (21–23%), nickel (4.5–6.5%) and molybdenum (2.5–3.5%), as well as nitrogen (0.100–0.220%), manganese and other elements. The combination of these elements contributes to the material's mechanical properties and corrosion resistance.
What mechanical properties does Duplex 1.4462 offer?
One of the most significant characteristics of Duplex 1.4462 is its high proof strength compared with conventional austenitic stainless steels under comparable conditions.
As a reference, technical specifications for certain 1.4462 long products in the solution-annealed condition indicate the following minimum values:
| Material property | Reference value |
|---|---|
| 0.2% proof strength Rp0.2 | 450 MPa |
| Tensile strength Rm | 650 MPa |
| Elongation at fracture | 25% |
These values refer to specific material delivery conditions and do not automatically represent the requirements applicable to finished fasteners.
Why is Duplex 1.4462 resistant to corrosion?
The combination of chromium, molybdenum and nitrogen contributes to resistance against localized corrosion, including pitting and crevice corrosion.
Duplex 2205 also offers good resistance to chloride-induced stress corrosion cracking under many service conditions.
These characteristics make the material suitable for consideration in industrial applications exposed to aggressive environments, including chemical processing plants, coastal infrastructure and certain offshore systems.
Duplex 1.4462 is not, however, immune to corrosion.
Chloride concentration, temperature, pH, stagnant conditions and joint geometry can influence the material's corrosion behavior.
In particular, contact surfaces and shielded areas within bolted assemblies must be considered when assessing the risk of crevice corrosion.
When should Duplex 1.4462 fasteners be selected?
Duplex 1.4462 fasteners may be particularly relevant when a project simultaneously requires:
- High mechanical strength of the connection.
- Corrosion resistance in a defined service environment, particularly where chlorides are present.
- Specified dimensional, mechanical and documentation requirements for the finished product.
The assessment must also consider actual service conditions, assembly characteristics and project requirements.
Duplex 1.4462 fasteners from Anchor Pro
Anchor Pro manufactures industrial fasteners in stainless steels and special alloys, including components made from Duplex 1.4462, according to DIN/ISO standards and customer specifications, subject to a manufacturing feasibility assessment.
Enquiries may cover standard fasteners and custom-made components manufactured to drawings, with mechanical and documentation requirements defined according to the supply specifications.
Looking for a manufacturer of Duplex 1.4462 fasteners? Send your enquiry to Anchor Pro for a feasibility assessment and quotation.