GNEE steel stocks Alloy 904L stainless steel plate in thicknesses from 3/16" through 2". Alloy 904L (UNS N08904) is a superaustenitic stainless steel designed for corrosion and pitting resistance in a wide range of process environments. It is used extensively in the chemical process industry including the production of phosphate-based fertilizers.
Available thicknesses for Alloy 904L:
Uniform Corrosion in pickling acid* at 25°C
| ALLOY | Corrosion Rate, mm/year |
|---|---|
| 904L | 0.47 |
| 254 SMO® | 0.27 |
| 654 SMO® | 0.06 |
*Composition: 20% HNO3 + 4 HF.
Uniform Corrosion in wet process phosphoric acid at 60°C
| ALLOY | Corrosion Rate, mm/year |
|---|---|
| 904L | 1.2 |
| 254 SMO® | 0.05 |
Composition: 54% P2O5, 0.06% HCI, 1.1% HF, 4,0% H2SO4, 0.27% Fe2O3, 0.17% AI2O3, 0.10% SiO2, 0.20% CaO and 0.70% MgO.
General Properties
Alloy 904L (UNS N08904) is a superaustenitic stainless steel that 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.
With its highly alloyed chemistry — 25% nickel and 4.5% molybdenum, 904L provides good chloride stress corrosion cracking resistance, pitting and general corrosion resistance superior to 316L and 317L molybdenum enhanced stainless steels.
Alloy 904L was originally developed to withstand environments containing dilute sulfuric acid. It also offers good resistance to other inorganic acids such as hot phosphoric acid as well as most organic acids.
Alloy 904L is easily welded and processed by standard shop fabrication practices
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