1.4539, 904L, N08904, Stainless Steel
Jan 22, 2026
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Applications
904L super austenitic stainless steel is specifically designed for applications involving highly corrosive environments where standard austenitic grades would experience premature failure. Its exceptional resistance to acid environments and chloride-induced corrosion makes it particularly suitable for:
Phosphoric acid production and processing equipment
Fertilizer manufacturing facilities
Sulfuric acid solutions and hydrometallurgy equipment
Saline solution handling systems
Seawater applications (with some restrictions)
Sour gas applications (separators and processing equipment)
Chemical processing plants with medium to severe conditions
Tall oil distillation columns
Pollution control equipment and flue gas desulfurization scrubbers
Food processing equipment exposed to acidic environments
Offshore oil and gas production equipment
Heat exchangers handling aggressive media
Grade Equivalents
| UNS | EN | Common Name |
|---|---|---|
| N08904 | 1.4539 (X1NiCrMoCu25-20-5) | 904L |
Chemical Composition (weight %)
| Element | Min % | Max % | Typical % |
|---|---|---|---|
| Carbon (C) | – | 0.020 | 0.015 |
| Chromium (Cr) | 19.5 | 20.5 | 20.0 |
| Nickel (Ni) | 23.0 | 28.0 | 25.0 |
| Molybdenum (Mo) | 4.0 | 5.0 | 4.3 |
| Copper (Cu) | 1.0 | 2.0 | 1.5 |
| Manganese (Mn) | – | 2.0 | 1.0 |
| Silicon (Si) | – | 1.0 | 0.5 |
| Phosphorus (P) | – | 0.045 | 0.03 |
| Sulfur (S) | – | 0.035 | 0.003 |
| Iron (Fe) | Balance | Balance | Balance |
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