Super Austenitic Stainless Steel: Characterized by High Nickel, High Chromium, and High Molybdenum.

254SMO

Grade 254 SMO (UNS S31254) is a premium 6% molybdenum super austenitic stainless steel engineered with a PREN ≥ 43 (calculated as Cr + 3.3Mo + 16N), delivering unparalleled resistance to pitting, crevice corrosion, and stress corrosion cracking in chloride-rich environments. Its optimized nitrogen content (0.18–0.22%) and copper addition (0.5–1.0%) enhance exceptional performance in seawater desalination plants, flue gas scrubbers, and chemical reactors handling aggressive media such as hot sulfuric and phosphoric acids.

Item
C%
Si%
Mn%
P%
S%
Cr%
Ni%
Mo%
Cu%
N%
Min
---
---
---
---
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19.50
17.50
6.00
0.50
0.18
Max
0.02
0.80
1.00
0.030
0.010
20.50
18.50
6.50
1.00
0.22

904L

Grade 904L (UNS N08904) is engineered for extreme reducing acid environments. Featuring an ultra-low carbon content (≤0.02% C), a high nickel-chromium matrix (23% Cr,25%Ni), and a PREN ≥ 36 (Cr + 3.3Mo + 16N), it delivers unparalleled corrosion resistance in concentrated acids such as >93% sulfuric, >85% phosphoric, and organic acids at elevated temperatures. Under these conditions, it reduces corrosion rates by a factor of 10 to 50 times compared to standard austenitic stainless steels.

Item
C%
Si%
Mn%
P%
S%
Cr%
Ni%
Mo%
Cu%
Min
---
---
---
---
---
19.00
23.00
4.00
1.00
Max
0.02
1.00
2.00
0.045
0.035
23.00
28.00
5.00
2.00
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