MONEL 400 Alloy (UNS N04400)

Topics Covered

Introduction
Chemical Composition
Physical Properties
Mechanical Properties
Other Designations
Fabrication
     Machinability
     Welding
     Forging
     Hot working
     Cold working
     Annealing
Applications

Introduction

MONEL nickel alloy is a solid solution alloy that can be hardened by the process of cold working.

MONEL is a trademark of Special Metals Corporation under which a series of nickel-copper alloys are grouped. Commercially there are many types of MONEL available, such as alloy 400, alloy 401, alloy R-405, Alloy K-500 and Monel 404.

The Monel 400 alloy is also known as super alloy monel. This alloy is available in some standard shapes such as hexagon, round, tube, pipe, plate, strip, sheet and wire.

The proportions of copper and nickel used to make monel are the same as that found in the nickel ore found in Ontario mines. This alloy exhibits good corrosion resistance. This datasheet will look into the chemical composition, properties and applications of MONEL 400 alloy.

Chemical Composition

The chemical composition of MONEL 400 alloy is given in the following table.

Element Content (%)
Nickel, Ni Remainder
Copper, Cu 28-34
Iron, Fe 2.5 max
Manganese, Mn 2 max
Silicon, Si 0.5 max
Carbon, C 0.3 max
Sulphur, S 0.024

Physical Properties

The following table discusses the physical properties of MONEL 400 alloy.

Properties Metric Imperial
Density 8.8 gm/cm3 0.318 lb/in3

Mechanical Properties

The mechanical properties of MONEL 400 alloy are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 517-620 MPa 75-90 ksi
Yield strength 172-345 MPa 25-50 ksi
Modulus of elasticity 179 GPa 26000 ksi
Poisson’s ratio 0.32 0.32

Other Designations

Some of the other designations that are used to denote MONEL 400 alloy are as below:

  • AMS 4574
  • AMS 4675
  • AMS 4731
  • ASTM B163
  • ASTM B165
  • ASTM F96
  • UNS N04400

Fabrication

Machinability

The machinability of MONEL 400 is difficult as it work-hardens during machining. The conventional machining techniques used on iron alloys may be used for this alloy.

Welding

Welding methods including gas-arc welding, metal-arc welding, gas-metal-arc welding and submerged-arc welding are recommended on this alloy.

Forging

Forging of this alloy is to be done by controlled procedures.

Hot working

Hot working on this alloy needs to be done by choosing proper temperatures. Typical temperatures for hot working range between 648-1176°C (1200-2150°F).

Cold working

Cold working may be done using soft die materials for better finishing.

Annealing

MONEL 400 alloy may be annealed at 926°C (1700°F).

Applications

The MONEL 400 alloy is used in the following applications:-

  • Marine fixtures, pumps, valves and piping systems for sea water applications
  • Chemical plant equipment
  • Frames for eyeglasses
  • Aerospace applications
  • Musical instruments.

Comments

  1. Jash Rampuria Jash Rampuria India says:

    Good information

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