UNS N04400 (Monel400) chemical composition and properties of Monel alloy

UNS N04400 (Monel400) chemical composition and properties of Monel alloy
 

UNS N04400 (Monel400) chemical composition and properties of Monel alloy

Material grade: Monel 400 (Monel) alloy



US grade: UNS N04400



German brand: 2.4360



1. Monel 400 (N04400) Overview of Monel alloy:



Monel 400 (N04400) Monel alloy is a corrosion-resistant alloy with the largest usage, the most wide range of uses, and excellent comprehensive properties. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance against hot concentrated alkali liquid. It is also resistant to corrosion from neutral solutions, water, seawater, atmosphere, organic compounds, etc. An important feature of this alloy is that it generally does not produce stress corrosion cracking and has good cutting performance.



The chemical composition of Monel400 alloy is mainly composed of 30% Cu and 65% Ni plus a small amount of Fe (1%-2%). The organizational structure is a typical single-phase austenite structure. Since nickel and copper can dissolve each other in any proportion, there is generally no intermetallic phase precipitation. When observing the structure of this alloy under non-etching conditions under a metallographic microscope, it can be seen that there are very dispersed non-metallic inclusions, such as sulfides and silicates, on the austenite matrix. Under certain conditions, the presence of carbides may also be observed. Due to differences in chemical composition, it can have a variety of alloy grades, but there is no significant difference in corrosion resistance between them. Monel400 alloy is more resistant to corrosion by reducing media than pure nickel, and more resistant to corrosion by oxidizing media than pure copper.



2. Monel 400 (N04400) Overview of Monel alloy:



Sis

Mns

P≤

Sε

Cr2

Ni≥

Mo2

Cus

0.30

0.50

2.00

0.024

63.0

28.0-34.0

Ns

Als

Tis

Fes

Cos

Vs

ws

Nbs

other

2.50



3. Mechanical properties of Monel 400 (N04400) Monel alloy:



1. Monel 400 (N04400) Monel alloy tensile strength: σb≥450Mpa.



2. Monel 400 (N04400) Monel alloy yield strength: σb≥170Mpa.



3. Monel 400 (N04400) Monel alloy elongation: δ≥30%.



4. Monel 400 (N04400) Monel alloy corrosion resistance:



1. The corrosion resistance of Monel is generally superior to that of nickel and copper. It is more resistant to corrosion from reducing media than pure nickel, and is more resistant to corrosion from oxidizing media than pure copper. It has excellent corrosion resistance to sulfuric acid, phosphoric acid and carbon. good. It is particularly resistant to hydrochloric acid corrosion and has excellent corrosion resistance to hot concentrated alkali. 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. Monel400 is a deformable nickel-copper nickel-based alloy. It has good resistance to seawater corrosion and chemical corrosion, and has strong resistance to chloride stress corrosion cracking. This alloy is one of the few that can be used in fluorides. It has good resistance to oxide stress cracking corrosion in hydrofluoric acid and fluorine gas media, such as seawater and salt water environments. Monel 400 also has very good corrosion resistance in moderately concentrated alkaline and salt solutions. In colder alkaline environments, the alloy is used in weak acid environments such as sulfur and hydrogen fluoride.



2. 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 withstand hydrofluoric acid.



3. Water corrosion: Monel400 alloy not only has excellent corrosion resistance under most water corrosion conditions, but also pitting corrosion, stress corrosion, etc. are rarely found, and the corrosion rate is less than 0.025mm/a.



4. High-temperature corrosion: The maximum temperature of Monel400's continuous operation in the air is generally around 600°C. In high-temperature steam, the corrosion rate is less than 0.026mm/a. Ammonia: Due to the high nickel content of Monel400 alloy, it can withstand corrosion under anhydrous ammonia and ammoniation conditions below 585°C.



5. Monel 400 (N04400) supporting welding materials for Monel alloy:



Monel400 welding rod (ENiCu-7), Monel400 welding wire (ERNiCu-7)



6. Application areas of Monel 400 (N04400) Monel alloy:



Marine heat exchangers, desalination equipment, salt production equipment, marine and chemical processing equipment, propeller shafts and water pumps, gasoline and water tanks, etc.



7. Varieties, specifications and supply status of Monel 400 (N04400) Monel alloy:



1. Variety classification: Monel400 seamless pipe, Monel400 steel plate, Monel400 round steel, Monel400 forgings, Monel400 flange, Monel400 ring, Monel400 welded pipe, Monel400 steel strip, Monel400 wire and supporting welding materials.



2. Delivery status: Seamless pipe: solid solution + acid whitening, length can be fixed; plate: solid solution, pickling, trimming; welded pipe: solid solution acid whitening + RT% flaw detection, forging: annealing + polishing; Bars are in forged and rolled state, surface polished or polished; strips are cold rolled, solution soft, and descaled; wires are delivered in solution pickled disk shape or straight strip shape, solid solution straight strip fine grinding Delivered in light condition.