Monel 400

Time:2019-08-13

Similar grade

UNS

Trademark

W.Nr

N04400

Monel400

2.4360



Chemical constituents of Monel 400:

alloy

%

Ni

Cu

Fe

C

n

Si

S

Monel 400

min

allowance


28






max

34

2.5

0.3

2

0.5

0.024


Physical properties of Monel 400:

density8.83 g/cm3
Melting point1300-1390 


Minimum mechanical properties of alloys at room temperature:

Alloy state

Tensile Strength
Rm N/mm2

Yield Strength
RP0.2 N/mm2

ElongatSion
A5 %

Monel400

480

170

35



Characteristics of Monel 400
Monel 400 is a kind of corrosion resistant alloy with the greatest amount, the most extensive use and excellent comprehensive properties. The alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas medium, as well as in hot concentrated alkali solution. It also resists corrosion of neutral solution, water, sea water, atmosphere, organic compounds, etc. An important characteristic of the alloy is that it does not produce stress corrosion cracks and has good cutting performance.

The metallographic structure of Monel 400:

The structure of Monel 400 alloy is a single-phase solid solution with high strength.

Corrosion resistance of Monel 400:

Monel 400 alloy has excellent corrosion resistance in fluorine, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. At the same time, it has better corrosion resistance than copper-based alloy in seawater. Acid medium: Monel 400 is corrosion resistant in sulfuric acid with concentration less than 85%. Monel 400 is one of the few important materials for hydrofluoric acid resistance. Water corrosion: Under most water corrosion conditions, Monel 400 alloy not only has excellent corrosion resistance, but also has little pitting and stress corrosion. The corrosion rate is less than 0.025 mm/a. High temperature corrosion: The highest temperature of continuous operation of Monel 400 in air is about 600 C. In high temperature steam, the corrosion rate is less than 0.026 mm/a. Ammonia: Because of the high nickel content of Monel 400 alloy, it can withstand the corrosion under anhydrous ammonia and ammoniation conditions below 585 C.

Monel 400 applications:

Monel 400 alloy is a multipurpose material which can be used in many industrial fields.

1. Seamless Pipeline and Steam Pipe in Power Plant

2. Seawater exchangers and evaporators

3. Sulfuric acid and hydrochloric acid environment

4. Crude distillation

5. Pump shafts and propellers of marine equipment

6. Equipment for uranium extraction and isotope separation in the nuclear industry

7. Manufacture of pumps and valves for hydrochloric acid production equipment


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