Inconel 693 alloy is an improved version of Inconel 690 alloy. Inconel 693 alloy mainly reduces the Fe content and adds a small amount of Al and Nb. The addition of Al promotes the formation of Cr, O, oxide film and stabilizes the single austenite phase of Ni-Cr alloy, which improves the corrosion resistance of the alloy. Nb has a solid solution strengthening effect on Ni-Cr alloy and can improve the corrosion resistance of the alloy in high temperature and high sulfur environment.
Inconel 693 alloy vs Inconel 690 Performance
The corrosion resistance and high temperature performance of Inconel 693 alloy have been significantly improved due to the addition of aluminum and niobium. The addition of aluminum promotes the formation and stabilization of chromium oxide film, forming a double-layer passivation film (CrO₃ outside and Al₂O₃ inside), which makes Inconel Alloy 693 has stronger corrosion resistance in molten glass.
In addition, the addition of niobium enhances the alloy's corrosion resistance in high temperature and high sulfur environments. In contrast, Inconel 690 alloy mainly forms a single layer of chromium oxide film, and its corrosion resistance is slightly inferior to Inconel 693 alloy.
Application of Inconel 693 alloy vs Inconel 690 alloy
Due to its excellent corrosion resistance and high temperature performance, Inconel 693 alloy is widely used in the petrochemical processing industry, especially in situations where metal dusting in chemical and petrochemical environments needs to be resisted.
Inconel 690 alloy is mainly used as the heat transfer tube material of the steam generator of the pressurized water reactor nuclear power plant, which is the core technology of the steam generator.
