Duplex 2205
UNS S32205 / S31803
High-strength duplex stainless steel for corrosive environments, CNC machined parts and made-to-drawing industrial components.
A duplex steel for parts working in demanding environments
Duplex 2205, commonly identified as UNS S32205 or UNS S31803, is a duplex stainless steel used when mechanical strength, corrosion resistance and service stability are required.
Its microstructure, formed by austenitic and ferritic phases, allows industrial components to be manufactured for environments with chlorides, humidity, aggressive fluids or demanding mechanical conditions.
Material identification
What is Duplex 2205?
It is a high-performance duplex stainless steel designed to work in conditions where conventional stainless steels may not be sufficient.
It is used in industrial parts that must withstand localised corrosion, mechanical loads, chloride exposure, aggressive fluids or environments where material reliability is critical.
Mechanical strength
Suitable material for components exposed to load, pressure or wear.
Corrosion
Good performance in industrial, marine and chemical environments.
Versatility
Applicable to fasteners, shafts, bushings, flanges and machined parts.
Traceability
Compatible with projects requiring certificates and document control.
Common Duplex 2205 designations
In drawings, certificates, technical orders or supply documentation, Duplex 2205 may appear under different references.
Why it is used in industrial components
Duplex 2205 is often selected for parts that need a good balance of strength, durability, machinability and corrosion resistance.
| Property | Technical advantage |
|---|---|
| High mechanical strength | Allows parts exposed to load, pressure or high stress to be manufactured. |
| Chloride resistance | Suitable for marine and chemical environments and systems with aggressive fluids. |
| Good fatigue resistance | Useful in components exposed to cycles, vibration or repeated movement. |
| Duplex structure | Combines characteristics of austenitic and ferritic stainless steels. |
| Technical documentation | Allows work with material certificates, heat numbers and traceability. |
A balanced alloy for industrial use
Duplex 2205 combines chromium, nickel, molybdenum and nitrogen to achieve corrosion resistance and strong mechanical performance.
In CNC machining, this combination requires control of tooling, cooling, rigidity, feed and cutting strategy to maintain dimensional precision and a good surface finish.
CNC machining of Duplex 2205
Machining Duplex 2205 requires experience with special stainless materials and control of the manufacturing process.
At AREM-CNC, we manufacture Duplex 2205 parts from drawings, physical samples or technical specifications, adapting the process to geometry, tolerance, quantity, finish and required documentation.
Made-to-drawing production
- Special screws and studs.
- Precision machined nuts.
- Technical washers, bushings and spacers.
- Pins, shafts and custom components.
- Flanges, plugs, rings and industrial parts.
- Components for pumps, valves and mechanical systems.
Where Duplex 2205 is used
This material is used in sectors where the part must resist corrosive conditions, mechanical loads and demanding continuous-service requirements.
Oil & gas
Chemical industry
Petrochemical
Marine applications
Desalination
Pumps
Valves
Industrial machinery
Controlled production for technical parts
CNC manufacturing transforms Duplex 2205 into customised, documented components prepared for demanding working conditions.
Made to drawing
Manufacturing adapted to specific dimensions, geometries and requirements.
Controlled tolerances
Dimensional control for parts requiring precision and repeatability.
Certified material
Work with technical documentation, batch identification and material traceability.
Technical finishes
Surface finish adapted to the real function of the part.
Flexible series
From prototypes and one-off parts to short or medium production runs.
Technical review
Analysis of material, standard, geometry, use and manufacturing process.
Technical documentation from material to delivery
In industrial projects, traceability can be as important as the dimensional precision of the part.
Depending on project requirements, we can work with material certificates, heat number control, dimensional verification, manufacturing batch and associated final documentation.
Frequently asked questions about Duplex 2205
What is Duplex 2205?
It is a duplex stainless steel commonly identified as UNS S32205, UNS S31803 or EN 1.4462, used when mechanical strength and good corrosion resistance are required.
What equivalences does Duplex 2205 have?
The most common references are UNS S32205, UNS S31803, EN 1.4462 and ASTM A182 F51 in certain supply formats.
Can screws be manufactured in Duplex 2205?
Yes. CNC machining can be used to manufacture screws, studs, nuts, washers, bushings, pins and special Duplex 2205 parts, provided that the design is feasible.
Where is Duplex 2205 used?
It is used in oil & gas, chemical industry, petrochemical, marine applications, desalination, pumps, valves and industrial machinery.
Why machine Duplex 2205 from drawings?
Because many applications require geometries, threads, tolerances, finishes, materials and documentation that are not always available in standard parts.
Do you need Duplex 2205 parts manufactured?
Send us your drawing, physical sample or technical specification. We will review material, tolerances, geometry, finish and documentation requirements to manufacture a reliable and traceable solution.