Monel 400 alloy
Monel 400 alloy (UNS N04400 or McU-28-1.5-1.8 or Ni68Cu28Fe) is a nickel base alloy material with good corrosion resistance in seawater, chemical solvents, amiothiochlorine, hydrogen chloride, various acidic media such as sulfuric acid, hydrofluoric acid, hydrochloric acid, phosphoric acid, organic acids, alkaline media, salts and molten salts.
Chinese name: Alloy 400
Thermal conductivity: 21.8 W/m K
Melting point: 1300-1350 ° C
Magnetic sex: 200H(At 70 F)
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| Summary | A nickel-copper alloy with high strength and excellent corrosion resistance in a range of media including sea water, hydrofluoric acid,sulfuric acid, and alkalies. Used for marine engineering, chemical and hydrocarbon processing equipment, valves, pumps, shafts, fittings,fasteners, and heat exchangers. | ||||||||
| Standard | Pipe, tube, sheet, strip, plate, round bar, flat bar, forging stock, hexagon and wire. | ||||||||
| Product Forms | |||||||||
Chemical composition (wt.-%) according to ASTM | Min. | Max. | Min. | Max. | Min. | Max. | |||
| Ni | 63 | Cu | 28 | 34 | C | 0.3 | |||
| Cr | Co | Si | 0.5 | ||||||
| Fe | 2.5 | Al | P | ||||||
| Mo | Ti | S | 0.024 | ||||||
| W | Mn | 2 | N | ||||||
Physical | Density,g/cm3 | 8.8 | |||||||
Constants | Melting Range,℃ | 1300-1350 | |||||||
Typical | (Annealed) | ||||||||
Mechanical | Tensile Strength,ksi | 80 | |||||||
Properties | Mpa | 550 | |||||||
| Yield Strength (0.2% Offset),ksi | 35 | ||||||||
| Mpa | 240 | ||||||||
| Elongation,% | 40 | ||||||||
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| Microstructure | Monel 400 is a solid-solution binary alloy. As nickel and copper are mutually soluble in all proportions, it is a single-phase alloy. It has a face-centered cubic lattice structure with a lattice parameter of 3.534 A. | ||||||||
Characters | Monel 400,with an excellent combination property,is a corrosion resistant alloy in a wide range of use and applications.It has an excellent corrossion resistance in the media of hydrofluoric acid and fluorine and also has a good corrossion resistance to hot strong alkali liquor. Besides it also resistant to corrossion in the neutral solution,water,sea water,air,organic compound etc..One important character of the alloy is that the stress corrossion cracking normorlly doesn’t occur and it has a good machinability. | ||||||||
Corrosion Resistance | |||||||||
| Monel 400 exhibits resistance to corrosion by many reducing media. It is also generally more resistant to attack by oxidizing media than higher copper alloys. This | |||||||||
| versatility makes alloy 400 suitable for service in a variety of | |||||||||
| environments. | |||||||||
| Alloy 400 is widely used in marine applications. While alloy 400 products exhibit very low corrosion rates in flowing seawater, stagnant conditions have been shown to induce crevice and pitting corrosion. Alloy 400 is also resistant to stress corrosion cracking and pitting in most fresh and industrial waters. | |||||||||
| Monel 400 offers exceptional resistance to hydrofluoric acid in all concentrations up to the boiling point. It is perhaps the most resistant of all commonly used | |||||||||
| engineering alloys. Alloy 400 is also resistant to many | |||||||||
| forms of sulfuric and hydrochloric acids under reducing | |||||||||
| conditions. | |||||||||
Applications | |||||||||
| Monel 400 is a material in a variety of applications,and is applied in many industrial areas. | |||||||||
| 1. feed-water and steam generator tubing in power plants | |||||||||
| 2. brine heaters and evaporator bodies in seawater desalination plants | |||||||||
| 3. pumps and valves used in the manufacture of chlorinated hydrocarbons | |||||||||
| 4 cladding for crude oil distillation columns | |||||||||
| 5. splash-zone sheathing in offshore structures | |||||||||
| 6. plants for uranium refining and isotope separation | |||||||||
| in the production of nuclear fuel | |||||||||
| 7. propeller and pump shafts for seawater service | |||||||||
