2205 is a duplex (austenitic-ferritic) stainless steel containing about 40 – 50% ferrite in the annealed condition. 2205 has been a practical solution to chloride stress corrosion cracking problems experienced with 304/304L or 316/316L stainless. The high chromium, molybdenum and nitrogen contents provide corrosion resistance superior to 316/316L and 317L stainless in most environments. 2205 is not suggested for operating temperatures above 600°F.
The design strength of 2205 is significantly higher than 316/316L, often permitting lighter wall construction. 2205 has good notch impact toughness down to temperatures below – 40°F. 2205 is welded with E2209 or ER2209 fillers.
| UNS | AISI/ASTM | DIN/EN | |||
| S31803/S32205 | 2205 | 1.4462 | |||
| Chemical Composition: | |||||
| % | C | Mn | P | S | Si |
| Min | |||||
| Max | 0.03 | 2 | 0.03 | 0.02 | 1 |
| Ni | Cr | Mo | N | ||
| Min | 4.5 | 21 | 2.5 | 0.08 | |
| Max | 6.5 | 23 | 3.5 | 0.2 | |
| Physical Performance: | |||||
| Heat Treatment | T*S | Y*S | El | Hardness | |
| MPA | MPA | % | HB | ||
| 1020-1100 | 620 | 450 | 25 | ≤290 | |
| Form | ASTM |
| Rod, bar and shape | A 276, A 484 |
| Plate, sheet and strip | A 240, A 480 |
| Seamless and welded pipe | A 790, A 999 |
| Seamless and welded tubing | A 789, A 1016 |
| Fitting | A 815, A 960 |
| Forged or rolled pipe flange and forged fitting | A 182, A 961 |
| Billet and bar for forging | A 314, A 484 |
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