Alloy 28 / Sanicro 28
1.4563Super-austenitic stainless steel (Fe-31Ni-27Cr-3.5Mo-1Cu) with ultra-low carbon. Exceptional resistance to sulfuric acid, phosphoric acid, and chloride stress corrosion cracking. Solution-annealed: Rm 500–750 MPa, Rp0.2 ≥220 MPa, A ≥35%. Density 8.0 g/cm³, PREN ~39–47. UNS N08028, ASTM B709/B668. Applications: phosphoric acid evaporators, sulfuric acid piping, oil/gas sour service (NACE MR0175), seawater heat exchangers, nuclear fuel reprocessing. Alleima trade name Sanicro 28.
International equivalents
| Flag | Standard | Country | Grade | Number | Match |
|---|---|---|---|---|---|
| 🇺🇸 | UNS | USA | N08028 | — | % |
| 🇪🇺 | EN | Europe | X1NiCrMoCuN31-27-4 | 1.4563 | % |
| 🇸🇪 | SS | Sweden | 2584 | — | % |
| 🇸🇪 | Alleima | Sweden | Sanicro 28 | — | % |
| 🇺🇸 | ASTM | USA | B668/B709 | — | % |
| 🇺🇸 | NACE | USA | MR0175/ISO 15156 listed | — | % |
Sources: SAE/ASTM, EN 10088, Swedish Standard, alleima.com, ASTM, NACE
Mechanical properties — Pro
Solution-Annealed
| Property | Value | Unit |
|---|---|---|
| Tensile Strength | ||
| Yield Strength | ||
| Elongation | ||
| hardness_brinell | ||
| Density | ||
| Elastic Modulus | ||
| specific_heat |
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