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The alloy consists of around 40-50% ferrite in the annealed condition. The duplex S32205 has the high strength of the ferritic grades whilst retaining the corrosion resistance of the austenitic grades.UNS S32205 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, UNS S32205 duplex stainless is also resistant to sulphide stress corrosion cracking (sour-gas environments).The high quality and therefore performance of Duplex UNS S32205 is widely attributed to the high levels of chromium present as well as nitrogen and molybdenum.
Grade | C≤ | Mn≤ | P≤ | S≤ | Si≤ | Ni | Cr | Mo | N |
S32205 | 0.04 | 2 | 0.03 | 0.02 | 1.00 | 4.5–6.5 | 22.0–23.0 | 3.0–3.5 | 0.14–0.20 |
Grade | Tensile, min, ksi[MPa] | Yield, min, ksi[MPa] | Elongation, %(min) | Hardness, HB（max） |
S32205 | 95 [655] | 65 [450] | 25 | 293 |
Density: 7.8 g/cm3
Duplex stainless steel S32205 Equivalent Grades
STANDARD | WERKSTOFF NR. | UNS | EN |
Duplex S32205 | 1.4462 | S32205 | X2CrNiMoN22-5-3 |
Duplex stainless steel S32205 ASTM Specifications
Pipe | Tube | Sheet/Plate | Bar /Rod | Forging /Flange | BW Fittings |
ASTM A790 | ASTM A789 | ASTM A240 | ASTM A276/A479 | ASTM A182 F60 | ASTM A815 |
Duplex stainless steel S32205 Application：
Seawater systems
Oil field piping
Chemical process vessels, piping, and heat exchangers
FGD scrubber systems
Pulp mill digesters, bleach washers
Food process equipment
