Displaying effective resistance to stress corrosion cracking, corrosion resistance under warm seawater conditions and excellent pitting resistance, UNS S31803/2205 is used for a wide range of applications.
| % | Cr | Fe | Mo | N | Ni | P | S | Si |
|---|---|---|---|---|---|---|---|---|
| Min | 22 | Balance | 3 | 0.14 | 4.50 | - | - | 0.20 |
| Max | 23 | - | 3.50 | 0.20 | 5.50 | 0.030 | 0.020 | 0.70 |
UNS S31803/2205 is a duplex grade with a ferritic-austenitic microstructure. The alloy consists of around 40-50% ferrite in the annealed condition. The duplex microstructure has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades. It is not uncommon to see the metal used as a practical solution to chloride-induced stress cracking, which is the achilles’ heel of stainless steel.
It has superior resistance to chloride pitting and crevice corrosion as compared to 317L stainless steel. The alloy has outstanding corrosion resistance to seawater and most concentrations of sulphuric acid. In addition, it is also resistant to sulphide stress corrosion cracking (sour-gas environments).
The high quality and therefore performance of UNS S32205 is widely attributed to the high levels of chromium present as well as nitrogen and molybdenum.
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