Monel 400 (UNS N04400) corrosion resistant alloy
Chemical composition of Monel 400:
| Alloy | Element | Min (%) | Max (%) |
|---|---|---|---|
| Monel 400 | Nickel (Ni) | 63 | - |
| Copper (Cu) | 28 | 34 | |
| Iron (Fe) | - | 2.5 | |
| Carbon (C) | - | 0.3 | |
| Manganese (Mn) | - | 2 | |
| Silicon (Si) | - | 0.5 | |
| Sulfur (S) | - | 0.024 |
Physical properties of Monel 400:
| Property | Value |
|---|---|
| Density | 8.83 g/cm³ |
| Melting Point | 1300–1390 °C |
Monel 400 annealed state, mechanical properties of the alloy at room temperature
| Alloy & Condition | Tensile Strength (σb, MPa) | Yield Strength (σ₀.₂, MPa) | Elongation (A₅, %) | Hardness (HV) |
|---|---|---|---|---|
| Monel 400 (Annealed) | ≥490 | ≥170 | ≥35 | ≤145 |
Monel 400 corrosion-resistant alloy has the following characteristics:
Monel400 is a corrosion-resistant alloy with large dosage, wide application and good comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated alkali solution. At the same time, it is also resistant to corrosion by neutral solutions, water, seawater, atmosphere, organic compounds, etc. An important feature of this alloy is that it generally does not produce stress corrosion cracks and has good cutting performance. Monel400 alloy has excellent corrosion resistance in fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. At the same time, it is more corrosion-resistant than copper-based alloys in seawater. Acid medium: Monel400 is corrosion-resistant in sulfuric acid with a concentration of less than 85%. Monel400 is one of the few important materials that can resist hydrofluoric acid. Water corrosion: Monel400 alloy has not only good corrosion resistance in most water corrosion conditions, but also rarely suffers from pitting corrosion and stress corrosion, and the corrosion rate is less than 0.025mm/a. The highest temperature of Monel400 in continuous operation in air is generally around 600℃. In high-temperature steam, the corrosion rate is less than 0.026mm/a. It can resist corrosion under anhydrous ammonia and ammoniation conditions below 585℃
Metallographic structure of Monel 400: The structure of Monel400 alloy is a high-strength single-phase solid solution.
Application scope of Monel 400 Application fields are:
Monel400 alloy is a multi-purpose material that can be used in many industrial fields:
1. Seamless water pipes and steam pipes in power plant feed water
2. Seawater exchangers and evaporators
3. Sulfuric acid and hydrochloric acid environments
4. Crude oil distillation
5. Pump shafts and propellers of equipment used in seawater
6. Equipment used in the nuclear industry for uranium refining and isotope separation
7. Pumps and valves used in equipment for manufacturing hydrochloric acid
8. Outer protective layer of corrosion-resistant cables
