what is saf 2205 duplex stainless steel？
Leave a message
what is saf 2205 duplex stainless steel?
SAF Duplex 2205 stainless steel is a duplex stainless steel alloy that combines the excellent properties of both ferritic and austenitic stainless steels. Composed of approximately 22% chromium, 5% nickel, 3% molybdenum, and other alloying elements, this grade of stainless steel exhibits precipitation of a brittle microstructure at temperatures above 300°C, and a ductile-to-brittle transition in its microstructure at temperatures below -50°C; therefore, this stainless steel is not suitable for use at these temperatures.
What is the ASTM equivalent of Saf 2205 material?
The ASTM equivalents for SAF 2205 (a trade name for Duplex 2205, UNS S32205/S31803) vary by product form but commonly fall under standards like ASTM A240 for plates/sheets, ASTM A789/A790 for pipes/tubes, and ASTM A182 for flanges/forgings, with the material designation often specified as UNS S32205 or UNS S31803.
| C | Si | Mn | P | S | Cr | Ni | Mo | N |
|---|---|---|---|---|---|---|---|---|
| ≤0.030 | ≤1.0 | ≤2.0 | ≤0.030 | ≤0.015 | 22 | 5 | 3.2 | 0.18 |
saf 2205 duplex stainless steel Mechanical properties
| Proof strength | Tensile strength | Elong. | Hardness | ||
|---|---|---|---|---|---|
| Rp0.2a | Rp1.0a | Rm | Ab | A2" | HRC |
| MPa | MPa | MPa | % | % | |
| ≥485 | ≥500 | 680-880 | ≥25 | ≥25 | ≤28 |
Imperial units
| Proof strength | Tensile strength | Elong. | Hardness | ||
|---|---|---|---|---|---|
| Rp0.2a | Rp1.0a | Rm | Ab | A2" | HRC |
| ksi | ksi | ksi | % | % | |
| ≥70 | ≥73 | 99-128 | ≥25 | ≥25 | ≤28 |
saf 2205 duplex stainless steel Physical properties
Density: 7.8 g/cm3, 0.28 lb/in3
|
Temperature, °C |
J/(kg °C) | Temperature, °F | Btu/(lb °F) |
|---|---|---|---|
| 20 | 480 | 68 | 0.11 |
| 100 | 500 | 200 | 0.12 |
| 200 | 530 | 400 | 0.13 |
| 300 | 550 | 600 | 0.13 |
| 400 | 590 | 800 | 0.14 |
Corrosion Resistance
SAF Duplex 2205 duplex stainless steel exhibits excellent corrosion resistance in a variety of corrosive environments, including seawater, brackish water, and various chemicals encountered in water and wastewater treatment processes. It is therefore highly suitable for applications involving chlorides, such as desalination plants and brackish water treatment facilities.
Strength and Durability
SAF Duplex 2205 duplex stainless steel possesses exceptional strength and durability. It is stronger than standard 316 austenitic stainless steel. The enhanced strength of SAF Duplex 2205 allows equipment and components to withstand mechanical stress, pressure fluctuations, and vibrations, ensuring long-term performance and reliability.
Applications
SAF 2205 is widely used in industries requiring strength and corrosion resistance, including:
Oil and gas production: piping, risers, subsea equipment
Chemical and petrochemical processing
Pulp and paper bleaching equipment
Marine and offshore structural components, fasteners, and shafts
Desalination and water treatment plants
Saf 2205 vs 316L
SAF 2205 (a duplex stainless) generally beats 316L (austenitic) in strength and chloride corrosion resistance, especially pitting and crevice, due to higher Chromium/Molybdenum/Nitrogen and its dual-phase structure, making it great for oil/gas/marine; however, 316L offers better workability, lower cost, and is preferred for food/pharma/easy-machining, while 2205 needs specialized welding and has a temperature limit to avoid embrittlement.
If you have project requirements for SAF Duplex 2205 duplex stainless steel, we welcome your order. GNEE has a large inventory of popular products for you to choose from. It can be processed into various practical product forms, including plates, coils, tubes, bars, wires, etc. For detailed chemical composition and free samples, please contact our factory immediately. We offer competitive prices and excellent service.
