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2205 Duplex UNS S31803
2205 Duplex stainless steel, which has a microstructure that contains both austenite and ferrite phases, and has an excellent combination of strength and corrosion resistance.
In the annealed condition 2205 Duplex has twice the annealed strength of a typical austenitic stainless steel, like 304 and 316 Stainless.
Applications: 2205 duplex stainless steels have been used in oil and gas, pumps and pump parts, valves, chemical and paper manufacturing.
| Carbon | max | 0.06% | Manganese | max | 4.00%-6.00% |
| Phosphorus | max | 0.040% | Sulfur | max | 0.030% |
| Silicon | max | 1.00% | Chromium | 20.50 - 23.50% | |
| Nickel | 4.50-6.50% | Molybdenum | 2.50-3.50% | ||
| Iron | Balance | Nitrogen | 0.08 - 0.20% |
Corrosion Resistance
The following table is for reference only, many factors can affect the corrosive resistance, a corrosion test for each application should be applied.
| Phosphoric acid | Moderate | Acetic Acid | Good |
| Sodium Hydroxide | Moderate | Sea Water | Moderate |
| Salt Spray | Excellent | Nitric Acid | Good |
| Sulfuric Acid | Moderate | Humidity | Excellent |
| Sour oil/gas | Moderate |
Heat Treatment
- Annealing:
- Heat to 1850/2050 F (1010/1121c) and quench in water. Brinell hardness approximately Rockwell 20 C.
- Hardening:
- Cannot be hardened by heat treatment. Cold working this alloy increases its strength and hardness.
- Machinability:
- Will be in between that of 316 and Nitronic 50.
- Shapes Manufactured:
- Flat Bars, Square Bars, Round Bars, Rings, Hollows, Discs, Blocks and special Shapes. Send us a drawing to see how we can save you material and Machining time!
The information in this data sheet is for information only and should not be used for engineering.
Materials
