Monel 400
400 alloy is a kind of copper nickel alloy with good corrosion resistance ability and good welding performance and moderate strength, so it has been widely used in various occasions. In salt water or seawater it has excellent resistance ability to pitting corrosion and stress corrosion, especially good resistance ability to hydrofluoric acid and hydrochloric acid. So it is widely used in chemical, petroleum, Marine industry.
Monel 400 corelative brand at home and abroad:
| The United StatesUNS | GermanySEW VDIUV | The British BS |
The French AFNOR |
|
| Monel 400 | N04400 | W.Nr.2.4360 NiCu30Fe |
NA 12 | Nu 30 |
Round steel, bar, strip, pipe, valve seat, sphere, flange and forgings
Monel 400 composition：
| Alloy | C | Mn | Si | S | Ni | Cu | Fe |
| Monel 400 | ≤0.30 | ≤2.00 | ≤0.50 | ≤0.024 | ≥63 | 28.0～34.0 | ≤2.5 |
| Density | 8.83g/cm3 |
| Melting Point | 1300-1390℃ |
| Alloy | Tensile strength Rm N/mm2 |
The yield strength RP0.2N/mm2 |
elongation A5 % |
Brinell Hardness HB |
| Monel400 | 480 | 170 | 35 | ≥331 |
| Specification | Status | σЬ/ MPa | σ0.2/MPa | δ5 /% |
| Bars | Rolled | 760 | 585 | 8 |
| Forged | 585 | 380 | 10 | |
| Tubes | Annealed | 483 | 83 | 40 |
| Stess Free | 586 | 207 | 15 |
Monel400 is a kind of corrosion resistant alloy with the most consumable, the most useful and th most comprehensive performance.The alloy has excellent corrosion resistance in hydrofluoric acid, fluorine gas and the hot strong alkali. Also it’s resistant to neutral solution, water and sea water, atmosphere, organic compounds. An important feature of the alloy is generally not to occur stress corrosion crack but with good cutting performance.
The metallographic structure of Monel 400:
Monel400 alloy features organization of a single phase solid solution with high strength.
Monel 400 corrosion resistance:
Monel400 alloy has excellent corrosion resistance in fluorine, hydrochloric acid, sulfuric acid, hydrofluoric acid, and their derivatives.At the same time it presents better corrosion resistance in seawater than copper alloy. Monel400 is corrosion resistant in sulfuric acid with concentration less than 85%. Monel400 is one of few important materials resistant in hydrofluoric acid.Water corrosion, Monel400 alloy also has not only excellent corrosion resistance, but also pitting corrosion, stress corrosion in water, with corrosion rate less than 0.025 mm/a. Monel400 works continuously and stably in air at about 600℃, with corrosion rate less than 0.026 mm/a in the high temperature steam. Ammonia: Monel400 has good corrosion resistance below 585℃at anhydrous ammoia and ammoniation due to its high nickel content.
Monel 400 process performance and requirements:
Hot working
Annealing temperature should be controlled in 700-900℃ and fast air cooling is recommended to get the best corrosion resistance. Annealing parameters such as soaking time and temperature will directly affect the final grain size, so it should be carefully formulated.
Cold working
Intermediate annealing should be conducted due to high work hardening rate after experienced an enough deformation.
Cold forming deformation should be higher than 5%.
Monel400 welding process
It’s suitable for argon arc welding, plasma arc welding, gas shielded welding or hand arc welding, with pulsed arc welding preferred. surface treatment is recommended after welding.
Application for Monel 400:
Monel400 alloy is a kind of multi-purpose material, can be applied in many fields:
1. The seamless water pipe, steam pipe of power plant
2. The water exchange and evaporator
3. The sulfuric acid and hydrochloric acid environment
4. The crude oil distillation
5. Used as sea water pump shaft and the propeller of the equipment
6. The manufacture of uranium refining and isotope separation equipment in nuclear industry
7. pump and valve in hydrochloric acid production.
