254SMO is the ultimate "6% Moly" super-austenitic steel, providing unmatched resistance to chloride pitting. With a PREN > 42.5, it is the strategic choice for desalination, offshore oil, and bleaching plants in 2026.
When standard stainless steels meet the relentless aggression of seawater or acidic chlorides, they often fail through localized "pitting."
254SMO (UNS S31254) was engineered to solve this exact problem, offering a cost-effective alternative to expensive nickel alloys and titanium.
The Power of "6% Moly"
The defining feature of 254SMO is its 6% Molybdenum content. In the world of metallurgy, Molybdenum is the primary defender against pitting and crevice corrosion. Combined with high levels of Chromium and Nitrogen, 254SMO achieves a Pitting Resistance Equivalent Number (PREN) of over 42.5, ensuring stability in even the saltiest environments.
Chemical Composition of 254SMO (Typical %)
| Element |
Chromium (Cr) |
Nickel (Ni) |
Molybdenum (Mo) |
Nitrogen (N) |
Copper (Cu) |
| Content |
19.5 – 20.5 |
17.5 – 18.5 |
6.0 – 6.5 |
0.18 – 0.25 |
0.5 – 1.0 |
Corrosion Resistance vs. Standard Alloys
| Alloy Type |
PREN Value (Cr+3.3Mo+16N) |
Chloride Resistance |
Best Use Case |
| 316L |
~24 |
Moderate |
Fresh Water |
| 904L |
~34 |
High |
Dilute Sulfuric Acid |
| 254SMO |
> 42.5 |
Superior |
Seawater / Bleaching Plants |
