Duplex 2205 (UNS S31803/S32205) is the most widely specified duplex stainless steel in the world. Its dual-phase microstructure (austenite + ferrite) delivers twice the yield strength of SS 316L at co...
Duplex 2205 (UNS S31803/S32205) is the most widely specified duplex stainless steel in the world. Its dual-phase microstructure (austenite + ferrite) delivers twice the yield strength of SS 316L at comparable corrosion resistance. PREN >35 ensures excellent resistance to chloride pitting and stress corrosion cracking — the key failure modes for stainless steel in seawater and sour gas environments.
| Property | Value |
|---|---|
| Grade | Duplex 2205 (S31803) |
| ASTM / ASME | ASTM A815 WP-S31803 |
| UNS Number | S31803 |
| Chromium (Cr) | 21–23% |
| Nickel (Ni) | 4.5–6.5% |
| Molybdenum (Mo) | 2.5–3.5% |
| Max/Min Service Temp | 300°C |
| Fitting Standard | ASME B16.9 / MSS SP-43 |
| Size Range | ½" NB to 48" NB |
| Certificate | EN 10204 3.1 MTC |
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