2205 Duplex Stainless Steel: Composition, Mechanical and Physical Properties
Feb 26, 2026
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What Is 2205 Duplex Stainless Steel?
2205 (S32205 / 1.4462) is the most widely‑used standard duplex stainless steel in industry. Its metallographic structure consists of approximately 50% austenite and 50% ferrite in balanced proportion, combining the high toughness of austenitic steel with the high strength and stress‑corrosion resistance of ferritic steel. Reinforced by high‑chromium, molybdenum and nitrogen alloying, it achieves a PREN value of 34‑36, delivering far superior resistance to chloride pitting and crevice corrosion compared with 316L austenitic stainless steel.
The yield strength of 2205 is roughly twice that of 316L. Under equal pressure‑bearing conditions, it allows effective reduction of structural wall thickness to realize lightweight design, cost reduction and efficiency improvement. It exhibits outstanding corrosion resistance against seawater, salt‑containing media, weak acids and flue‑gas desulfurization environments, and is widely applied in marine engineering, oil‑gas equipment, chemical fluid systems and environmental‑protection desulfurization units.
Equivalent Grades of 2205 Duplex Stainless Steel
| Standard System | Grade |
|---|---|
| UNS (USA) | S32205 (former designation S31803) |
| ASTM Plate / Sheet | A240 2205 |
| ASTM Tube / Pipe | A789 / A790 S32205 |
| ASTM Forging | A182 F60 |
| EN (Europe) | 1.4462 / X2CrNiMoN22‑5‑3 |
| GB (China) | 022Cr22Ni5Mo3N (S32205) |
Chemical Composition of 2205 Duplex Stainless Steel
| Element | Composition Range |
|---|---|
| Carbon (C) | ≤0.03 |
| Manganese (Mn) | ≤2.00 |
| Silicon (Si) | ≤1.00 |
| Phosphorus (P) | ≤0.030 |
| Sulfur (S) | ≤0.020 |
| Chromium (Cr) | 22.00‑23.00 |
| Nickel (Ni) | 4.50‑6.50 |
| Molybdenum (Mo) | 3.00‑3.50 |
| Nitrogen (N) | 0.14‑0.20 |
Physical Properties (Typical values at 20 ℃) of 2205 Duplex Stainless Steel
| Property | Value | Remarks |
|---|---|---|
| Density | 7.80 g/cm³ | |
| Melting Range | 1350‑1390 ℃ | |
| Modulus of Elasticity | 190 GPa | |
| Thermal Conductivity | 14.0 W/(m·K) | At 20 ℃ |
| Mean Coefficient of Linear Thermal Expansion | 13.7×10⁻⁶ /℃ | 20‑100 ℃ |
| Specific Heat Capacity | 450 J/(kg·℃) | 20‑100 ℃ |
Mechanical Properties of 2205 Duplex Stainless Steel
| Property | Value |
|---|---|
| Tensile Strength | ≥655 MPa |
| 0.2% Offset Yield Strength | ≥450 MPa |
| Elongation | ≥25 % |
| Brinell Hardness | ≤293 HB |
Key Characteristics of 2205 Duplex Stainless Steel
1. What is the biggest corrosion advantage of 2205 duplex stainless steel?
2205 duplex stainless steel has excellent chloride corrosion resistance. With the composite alloying design of chromium, molybdenum and nitrogen, its PREN value reaches 34-36. It has far better pitting and crevice corrosion resistance than 316L stainless steel, and can withstand seawater and high-salt corrosive media, which is very suitable for marine engineering, seawater desalination and other high-chloride working conditions.
2. Does 2205 duplex steel have cost advantages in engineering application?
It has significant cost advantages. The yield strength of 2205 is about twice that of 316L austenitic stainless steel. Under the same pressure-bearing working conditions, the wall and plate thickness can be reduced, which effectively lowers equipment weight and raw material consumption, saving engineering costs. Meanwhile, its lower nickel content makes it less affected by nickel price fluctuations with higher cost stability.
3. How is the stress corrosion resistance of 2205 duplex stainless steel?
2205 has excellent resistance to stress corrosion cracking. Its unique duplex microstructure of 50% austenite and 50% ferrite can effectively resist the superimposed damage of chloride ions, corrosive media and mechanical stress, solving the common failure problem of stress corrosion cracking of ordinary austenitic stainless steel.
4. Does 2205 duplex stainless steel have good weldability?
It features good weldability and can be welded conventionally. The welded joint can stably maintain a duplex microstructure with reliable welding performance. Only reasonable control of welding heat input is required during construction, and solution heat treatment after welding is not needed under conventional working conditions, simplifying the construction process and improving efficiency.
5.What general corrosion environments can 2205 adapt to?
2205 has excellent uniform corrosion resistance and good resistance to various weak acids, organic acids and salt media. It is widely applicable to conventional corrosive working conditions such as chemical production, flue gas desulfurization and environmental protection equipment with a wide range of applications.
Applications of 2205 Duplex Stainless Steel
1.Offshore & On‑site Oil‑Gas Platforms: Seawater cooling pipelines, fire‑water pipes and process fluid piping for offshore platforms, resisting chloride‑induced corrosion and stress‑corrosion cracking.
2.Seawater Desalination Plants: RO pressure vessels, seawater transfer pipes and heat‑exchange tubes for high‑salinity seawater service, as a cost‑effective alternative to high‑nickel alloys.
3.Chemical Process Systems: Reactor piping, heat exchangers, separators and forged flanges for chloride‑containing process media, handling salt solutions and organic acids.
4.Oil & Gas Production: Downhole tubing, gathering pipelines and wellhead fittings for chloride‑ and hydrogen‑sulfide‑containing corrosive media. 5.Flue‑gas Desulfurization & Denitrification Equipment: Internals of absorption towers, slurry transfer pipelines and circulating pump valves, resisting erosion‑corrosion from acidic desulfurization slurry.
6.Water Treatment Industry: High‑salinity wastewater treatment units, brine circulation pipelines and critical pressure‑bearing components for sewage systems.
7.Pulp & Paper Industry: Digester equipment and bleaching process pipelines against pitting corrosion from bleaching chemicals.
Seawater desalination unit
Chemical pipelines
Water treatment piping
Manufacturer of 2205 Duplex Stainless Steel
GNEE is a professional Chinese supplier for 2205 duplex stainless steel (UNS S32205 / 1.4462), with 18‑year experience in special stainless‑steel manufacturing and global export. We supply a full range of 2205 products including plates, seamless & welded pipes, bars, forged flanges and fittings, manufactured strictly in compliance with ASTM A240, A789, A790, A182, EN and other international standardsGnee Stain.
We have established a complete full‑process quality control system, including PMI spectral verification for raw materials, solution‑annealing heat treatment, dimensional inspection, tensile and hardness mechanical tests, as well as UT/ET non‑destructive testing. Pitting corrosion and intergranular corrosion tests can be performed upon request. Each batch of products is supplied with EN10204 3.1 material certificates, with full heat‑number traceability, to meet the acceptance requirements of overseas projects such as offshore engineering, oil & gas, seawater desalination and chemical flue‑gas desulfurization.
Our factory provides custom processing services: cutting‑to‑length, beveling, chamfering, polishing, CNC machining and non‑standard forging. Multi‑layer moisture‑proof export wooden‑case packaging is adopted for long‑distance ocean shipment. Our products have been exported to more than 60 countries worldwide. We have rich supply references for offshore platforms, seawater desalination plants and chemical plants. One‑stop solutions covering material selection consultation, sample testing and orders of all volumes are available for global clientsGnee Steel...
2205 Stainless Steel Coil
2205 Stainless Steel Plate
2205 Stainless Steel Pipe
If you are looking for high-quality 2205 stainless steel products, please click below to contact us quickly; we can provide you with professional purchasing solutions.
FAQ
1.What is the main difference between 2205 duplex steel and 316L stainless steel?
2205 is duplex‑phase (austenite + ferrite). Its yield strength is about twice that of 316L, with much better resistance to chloride pitting, crevice corrosion and stress‑corrosion cracking. 316L is fully austenitic, better for general mild‑corrosion conditions without high‑chloride stress risk. 2205 is preferred for seawater, brine and high‑chloride working environments.
2.What service temperature range is suitable for 2205 duplex stainless steel?
A: Recommended service temperature:‑50 ℃ ~ 280 ℃. Long‑term operation above 300 ℃ shall be avoided, as brittle intermetallic phases will precipitate and cause material embrittlement. It is also not fit for ultra‑low‑temperature service due to ferrite‑phase brittleness.
3.Can 2205 duplex steel be welded? Is post‑weld heat treatment required?
It has good weldability. Welding heat input must be well‑controlled to maintain balanced austenite‑ferrite ratio at weld joints. Post‑weld solution annealing is generally unnecessary for ordinary projects; critical high‑risk projects shall follow project specifications.
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