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Duplex 2205 stainless steel (both ferritic and austenitic) is used extensively in applications that require good corrosion resistance and strength. The S31803 grade stainless steel has undergone a number of modifications resulting in UNS S32205, and was endorsed in the year 1996. This grade offers higher resistance to corrosion.
At temperatures above 300°C, the brittle micro-constituents of this grade undergo precipitation, and at temperatures below -50°C the micro-constituents undergo ductile-to-brittle transition; hence this grade of stainless steel is not suitable for use at these temperatures.
Duplex stainless steel have high chromium and low nickel contents. This gives duplex stainless steel microstructures that include both austenitic and ferritic phases. They include alloys like 2304 and 2205. These alloys are so named due to their respective compositions - 23% chromium, 4% nickel and 22% chromium, 5% nickel.
By having both austenite and ferrite in the microstructure, duplex stainless steel feature properties of both classes. Although a compromise between the two ‘pure’ types, duplex grades can offer some unique property solutions. Duplex grades are resistant to stress corrosion cracking, but not to the same level as ferritic grades. The toughness of duplex grades is superior to that of the ferritic grades – but inferior to that of the austenitic grades.
Most importantly, the corrosion resistance of duplex steels is equal, or superior to 304 and 316 stainless steel. This is particularly so for chloride attack.
Duplex grades are readily welded. They also have high tensile strengths.
Duplex stainless steel typically find application in areas like:
| Grade | C | Mn | Si | P | S | Cr | Mo | Ni | N | |
| 2205 (S31803) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 21.0 23.0 | 2.5 3.5 | 4.5 6.5 | 0.08 0.20 |
| 2205 (S32205) | Min Max | - 0.030 | - 2.00 | - 1.00 | - 0.030 | - 0.020 | 22.0 23.0 | 3.0 3.5 | 4.5 6.5 | 0.14 0.20 |
| Grade | Tensile Str (MPa) min | Yield Strength 0.2% Proof (MPa) min | Elongation (% in 50mm) min | Hardness | |
| Rockwell C (HR C) | Brinell (HB) | ||||
| 2205 | 621 | 448 | 25 | 31 max | 293 max |
| Facing process | feature and application |
| NO. 1 | Hot rolled, annealing, pickling. Usually used to cold rolled material, pot for industry, device for the chemical industry and so on. |
| NO. 2B | Almost satisfy for cold - rolled and stainless steel ' s applications, such as Kitchen products, surface finish, furniture and sufficient. |
| BA | Cold rolled, bright annealing, Flat, smooth and excellent horizontal installation |
| matte side | NO. 2B surface is rolled made from dull roll, have loftex surface. Used for Construction decorated, elevator decorated. |
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