Application conditions of C-2000 alloy and 59 alloy stainless steel in chlorinated aqueous solutions

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1. C-2000 alloy: A nickel-based alloy developed in the 1990s; its price is similar to that of C-276, and it is one of the materials with the best corrosion resistance among those listed. In media such as sulfuric acid at concentrations below moderate levels, dilute hydrochloric acid, phosphoric acid at concentrations ≤50% at boiling temperature, and hot chlorides, its corrosion resistance is better than that of C-276 and C-22, showing a trend to replace the C-22 alloy. However, for sulfuric acid with a concentration of ≥70%, its corrosion resistance is inferior to that of C-276. 2. Compared with C-2000, the chemical composition of the 59 alloy is basically the same, except that the Ni content is slightly higher (59%), there is less Fe, and it is free of Cu and W. It is currently the nickel-based alloy with the best corrosion resistance, thermal stability, formability, and weldability. Since its commercialization in 1990, it has been widely used in sulfuric acid, hydrochloric acid, hydrofluoric acid, as well as many media containing chlorine, oxygen, and at low pH levels.