Alloy 904L (UNS N08904 904 steel plate) is a superaustenitic stainless steel that UNS N08904 904 steel plate is designed for moderate to high corrosion resistance in a wide range of process environments. The combination of high chromium and nickel content, coupled with additions of molybdenum and copper, assure good to excellent corrosion resistance.
The high content of alloying elements in UNS N08904 904 steel plate gives the alloy exceptionally good resistance to uniform corrosion.
Uniform Corrosion in pickling acid* at 25°C
| ALLOY | Corrosion Rate, mm/year |
|---|---|
| 316L | >6 |
| 904L | 0.47 |
| 254 SMO® | 0.27 |
| 654 SMO® | 0.06 |
UNS N08904 904 steel plate was originally developed to withstand environments containing dilute sulfuric acid, and is one of the few stainless steels that, at temperatures up to 95°F (35°C), provides full resistance in such environments within the entire concentration range of 0 to 100%. UNS N08904 904 steel plate also offers good resistance to a number of other inorganic acids, such as phosphoric acid and most organic acids. However, acids and acid solutions containing halide ions can be very aggressive, and the corrosion resistance of 317L, 317LMN and 904L may be insufficient.
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