MONEL Alloy 404 (UNS N04404)

Topics Covered

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

Introduction

MONEL alloys contain nickel and copper as the main components. Robert Crooks Stanley discovered this alloy in 1901 while working at the International Nickel Company.

There are a number of MONEL alloys available commercially including MONEL 400, 401, 404, R-405, 450 and K-500. The standard forms in which MONEL alloys are available are hexagon, flats, forging stock, tube and pipe.

MONEL 404 has a relatively high copper content, hence is suitable for electric and electronic applications. The content of the elements that make up the MONEL 404 is adjusted such that the alloy has a very low Curie temperature, low permeability and good brazing characteristics.

This datasheet will look into the chemical composition, properties and applications of MONEL 404 alloy.

Chemical Composition

The chemical composition of MONEL 404 alloy is given in the following table.

Element Content (%)
Nickel, Ni 50 - 57 max
Copper, Cu ≤ 45.5
Iron, Fe ≤ 0.50
Carbon, C ≤ 0.15
Manganese, Mn ≤ 0.10
Silicon, Si ≤ 0.10
Aluminum, Al ≤ 0.050
Sulfur, S 0.024

Physical Properties

The following table discusses the physical properties of MONEL 404 alloy.

Properties Metric Imperial
Density 8.91 gm/cm3 0.322 lb/in3

Mechanical Properties

The mechanical properties of MONEL 404 alloy are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 483 MPa 70 ksi
Yield strength(annealed) 172 MPa 25 ksi
Poissons Ratio 0.295 0.295
Modulus of Elasticity 169 GPa 24500 ksi

Other Designations

Some of the other designations that are used to denote MONEL 404 alloy are as below:-

  • UNS N04404
  • ASTM F96

Fabrication

Machinability

Conventional machining techniques used on iron alloys may be used for this alloy.

Welding

Alloy 404 is can be welded using common welding techniques.

Hot working

This alloy cannot be hot worked.

Forging

Alloy 404 can be forged.

Cold working

Cold working may be done using standard tooling and soft die materials for better finish.

Annealing

MONEL 404 alloy should be annealed at 760°C (1400°F) for one hour.

Applications

The MONEL 404 alloy is used in the following applications:

  • Capsules for transistors
  • Ceramic to metal sealing

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