What Is Monel 400 Alloy?

Monel 400 Alloy Introduction

The structure of Monel 400 alloy (UNS N04400, NCu30) is a high-strength single-phase solid solution. It is a corrosion-resistant alloy with the largest amount, the widest application and excellent comprehensive properties.

kaysuns-tubes-pipes

This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated lye. It is also resistant to corrosion by neutral solutions, water, seawater, air, organic compounds, etc. An important feature of this alloy is that it generally does not produce stress corrosion cracks and has good cutting performance.

  • Sheet standard: ASTM B127 ASME SB127
  • Forging standard: ASTM B564 ASME SB564

Chemical composition

Ni: >63; Cu: 28-34; Si: <0.5; Mn: <2.0; C: <0.30; Fe: <2.0.

This is a nickel-based alloy. Monel 400 alloy is also known as N04400. It is a corrosion-resistant alloy with large dosage, wide application and excellent comprehensive performance. This alloy has excellent corrosion resistance in hydrofluoric acid and fluorine gas media, and also has excellent corrosion resistance to hot concentrated lye. At the same time, it is 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 cracks and has good cutting performance.


Typical Properties of Monel 400 Alloy

Property

Metric

Imperial

Density

8.8 g/cm3

0.318lb/in3

Melting point

1350°C

2460°F

Co-Efficient of Expansion

13.9µm/m.°C
(20-100°C)

7.7x10-6 in/in.°F
(70-212°F)

Modulus of rigidity

65.3 kN/mm2 9471 ksi

Modulus of elasticity

105-120 kN/mm2

15230-17405 ksi


Properties of Supplied Materials and Heat Treated Materials

Condition of Supply

Heat Treatment (After Forming)

Annealed/Spring Temper

Stress relieve at 300-320°C (570-610°F) for 1 hour and air cool.

Condition

Approx Tensile Strength

Approx Service Temp.

Annealed

400 - 600 N/mm2

58 - 87 ksi

-200 to +230°C

-330 to +445°F

Spring Temper

850 - 1050 N/mm2

123 - 152 ksi

-200 to +230°C

-330 to +445°F


Applications

Pipes made by Monel 400 alloy is a corrosion-resistant alloy with excellent comprehensive performance. Among fluorine gas, hydrochloric acid, sulfuric acid, hydrofluoric acid and their derivatives, the alloy has excellent corrosion resistance. The alloy is widely used in marine, chemical and other fields. Typical applications include: pumps and propeller shafts; marine devices and fasteners; chemical equipment; gasoline and fresh water tanks; crude oil stills; processing vessels and pipelines; boiler feedwater heaters; replacement Heater.

Posted by stainless steel pipe and fittings supplier, KAYSUNS

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