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Baoji Hong Ya Da Nonferrous Metal Materials Co.,Ltd.
Add: No.85,Baotai Road,High-tech Development Zone,Baoji City,Shaanxi,China.721013
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Nickel Copper Alloy Monel 400

nickel copper alloy monel 400

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Product details:

The chemical composition of Monel400 alloy is mainly composed of 30% Cu and 65% Ni plus a small amount of Fe (1%-2%). 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 is more resistant to corrosion by oxidizing media than pure copper.

National standards and general terms: MONEL400, ASTM B127, ASME SB-127, AMS 4554, JIS NW4400

US UNS:N04400, Germany DIN: NiCu30Fe W-Nr: 2.4360 China GB/T: MCu-28-1.5-1.8 UK BS: NA 12 Chemical composition label: Ni68Cu28Fe

Monel-400 alloy steel

The chemical element composition of Monel400 alloy: C: ≤0.3, Si: ≤0.50, Mn: ≤2.0, Ni: ≥63, Cu: 28~34, S: ≤ 0.024, Fe ≤ 2.5, Unit: %

The chemical composition of Monel400 alloy consists mainly of 30% Cu and 65% Ni plus a small amount of Fe (1% - 2%). The tissue structure is a typical single-phase austenite structure. Since nickel and copper are mutually soluble in any ratio, there is generally no intermetallic phase precipitation. Observing the microstructure of the alloy under non-etching conditions under a metallographic microscope, it can be seen that there is a very diffuse non-metallic inclusion on the austenite matrix, such as sulfides and silicates. Under certain conditions, the presence of carbides was also observed.


Tensile strength: σb≥450Mpa, yield strength: σb≥170Mpa, elongation: δ≥30%

Mechanical properties of Monel400 alloy products in various states

Material and State Tensile Strength / Mpa Yield Strength / Mpa Elongation % Hardness

Bar: Annealed state 516 ~ 620170 ~ 34560 ~ 35110 ~ 14960 ~ 80

Hot working state (≤54mm profile) 551~757275~69060~30140~24175~100

Hot working state (≥ 54mm profile) 516~689205~38050~30130~18472~90

Cold extraction state, after stress relief treatment 578 ~ 827380 ~ 69040 ~ 22160 ~ 22585 ~ 20HRC

Medium and heavy plate: hot rolled state 516 ~ 655380 ~ 39045 ~ 30125 ~ 21570 ~ 96

Hot rolled and annealed state 482 ~ 585195 ~ 34550 ~ 35110 ~ 14060 ~ 76

Thin plate: annealed state 482 ~ 585170 ~ 31050 ~ 35

Cold rolling, hard state 689~964620~75515~2

Cold rolled strip: annealed state 517 ~ 585170 ~ 31050 ~ 35

Tempered state 689~964620~89515~2

Tube: cold drawn + annealed state 516 ~ 585170 ~ 31050 ~ 35

(seamless): cold pull + stress relief state 585 ~ 827380 ~ 69035 ~ 15

Corrosion resistance

Monel's corrosion resistance is generally superior to nickel-copper. It is more resistant to reducing media than pure nickel, corrosion to pure copper oxidation-resistant media, and very resistant to sulfuric acid, phosphoric acid, and carbon. In particular, it is resistant to corrosion by hydrochloric acid and has excellent corrosion resistance to hot concentrated alkali. Monel 400 alloys have excellent corrosion resistance in fluorine, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives. At the same time, it is more resistant to corrosion than copper-based alloys in seawater.

Monel-400 steel pipe

Monel400 is a deformable nickel-copper based nickel-based alloy with good resistance to seawater corrosion and chemical corrosion, and resistance to chloride stress corrosion cracking. This alloy is one of the few alloys that can be used in fluoride. It has excellent resistance to oxide stress cracking corrosion in hydrofluoric acid and fluorine gas media, such as seawater and salt water.

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 acids such as sulfur and hydrogen fluoride.

Acid medium: Monel 400 is corrosion resistant in sulfuric acid with a concentration of less than 85%. Monel400 is one of the few materials that are resistant to hydrofluoric acid.

Water corrosion: Monel400 alloy has excellent corrosion resistance in most water corrosion conditions, and pitting corrosion and stress corrosion are rarely found. The corrosion rate is less than 0.025mm/a.

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

Matching welding consumables

Monel Monel400 electrode (ENiCu-7), Monel400 wire (ERNiCu-70)


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

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