Monel 400 is a corrosion resistant alloy with high usage, wide application and good overall performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated alkaline solutions. It is also resistant to corrosion by neutral solutions, water, seawater, atmosphere, organic compounds, etc. An important feature of the alloy is that it generally does not produce stress corrosion cracks and has good cutting properties.
Metallographic structure of Monel 400.
The organization of Monel 400 alloy is a high strength single phase solid solution.
Corrosion resistance of Monel 400.
Monel 400 alloy has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. It is also more resistant to corrosion in seawater than copper-based alloys. Acid media: Monel400 is corrosion resistant in sulfuric acid at concentrations less than 85%. monel400 is one of the few important materials that can resist hydrofluoric acid. Water corrosion: Monel400 alloy in most cases of water corrosion, not only good corrosion resistance, and hole corrosion, stress corrosion, etc. are rarely found, the corrosion rate is less than 0.025mm/a. High temperature corrosion: Monel400 in the air continuous work in the high temperature is generally around 600 ℃, in the high temperature steam, the corrosion rate is less than 0.026mm/a. Ammonia: Due to Monel 400 alloy has high nickel content, so it can resist corrosion under anhydrous ammonia and ammonia conditions below 585℃.
Monel 400 process properties and requirements.
The annealing temperature should be controlled at 700-900 °C. Fast air cooling is recommended to obtain good corrosion resistance. Time and temperature will directly affect the final grain size, and the annealing parameters must be carefully defined.
Cold working should be intermediate annealing. Cold formed deformation with high work hardening rate should be higher than 5% and must be used only after stress relief or annealing.
Monel 400 welding process
Available argon arc welding, plasma arc, gas shielded welding or hand arc welding, etc., pushing pulse arc welding, good surface treatment after welding.
Monel 400 application range application domain has.
Monel 400 alloy is a versatile material that can be used in many industrial domains.
1. Seamless water pipes and steam pipes in power plants
2. Seawater exchangers and evaporators
3. Sulfuric and hydrochloric acid environments
4. Crude oil distillation
5. Pump shafts and propellers for equipment used in seawater
6. Nuclear industry equipment for the manufacture of uranium refining and isotope separation
7. Pumps and valves for equipment used in the manufacture of hydrochloric acid production