Monel alloy is a Ni-Cu series corrosion-resistant alloy, there are two types: machining monel strengthened, with Monel400, 404, R405 and other brands; precipitation hardening, with Monel K-500, 502 and other brands, commonly used Monel 400 and K-500 The mechanical properties of Monel K-500 are better than Monel 400, but the corrosion resistance is slightly worse.
Monel-400 is a single-phase austenitic alloy of Ni-Cu solid solution, which has excellent corrosion resistance and medium temperature strength, especially in medium and high temperature strong acid and strong alkali medium. It can show good corrosion resistance. Therefore, in recent years, this monel machining has been increasingly used in the manufacture of some special equipment in my country’s petrochemical and nuclear industries.
Monel alloy has excellent corrosion resistance to reducing media, and has good stability in many corrosive media such as hydrofluoric acid, alkali, seawater, H2S, H2SO4, H3PO4, organic acids, etc., especially in hydrofluoric acid and alkaline solutions