Both Zeron 100 and Zeron 100 FG meet the chemistry requirements
of UNS S32760 and are made to a minimum PREn (pitting resistance equivalent) of 40 and
are suitable for seawater service.
All Zeron Tensile Classes viz; Zeron 100 FG, Zeron 100 FLT, Zeron 100 SA & Zeron 100 AFP meet the chemistry requirements of UNS S32760
and are made to a minimum PREn (pitting resistance equivalent) of 40 and are suitable
for seawater service.
| Alloy | Min Wrought (Cast), % | Max Wrought (Cast), % |
|---|---|---|
| Chromium (Cr) | 24 | 26 |
| Nickel (Ni) | 6.0 (6.5) | 8.0 (8.5) |
| Molybdenum (Mo) | 3 | 4 |
| Tungsten (W) | 0.5 | 1 |
| Copper (Cu) | 0.5 | 1 |
| Nitrogen (N) | 0.2 | 0.3 |
| Silicon (Si) | – | 1 |
| Carbon (C) | – | 0.03 |
| Manganese (Mn) | – | 1 |
| Phosphorus (P) | – | 0.03 |
| Sulfur (S) | – | 0.01 (0.025) |
| Iron (Fe) | Balance | |
|
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Procurement engineers comparing Zeron 100 to other super duplex alloys typically evaluate UNS S32750 (SAF 2507) and UNS S32550 (Ferralium 255). All three are "super duplex" per the PREN >= 40 definition but their compositions differ in W, Cu, and Mn additions.
| Element | UNS S32760 (Zeron 100 / F55) | UNS S32750 (SAF 2507 / F53) | UNS S32550 (Ferralium 255) |
|---|---|---|---|
| Cr | 24.0-26.0 | 24.0-26.0 | 24.0-27.0 |
| Ni | 6.0-8.0 | 6.0-8.0 | 4.5-6.5 |
| Mo | 3.0-4.0 | 3.0-5.0 | 2.9-3.9 |
| N | 0.20-0.30 | 0.24-0.32 | 0.10-0.25 |
| Cu | 0.50-1.00 | 0.50 max | 1.50-2.50 |
| W | 0.50-1.00 | not added | not added |
| Mn | 1.00 max | 1.20 max | 1.50 max |
| PREN | ≥ 40 | ≥ 40 | ≥ 38 |
Cross-reference: full Zeron 100 vs SAF 2507 comparison for mechanical and corrosion envelope detail.
