MONEL Alloy 401 (UNS N04401)

Topics Covered

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

Introduction

MONEL alloys are solid solution alloys that can be hardened by subjecting them to cold working. There are different types of MONEL alloys available commercially, namely, MONEL 400, 401, 404, R-405, 450 and K-500. The standard forms of MONEL alloy are hexagon, flats, forging stock, tube and pipe.

MONEL 401  is designed for use in special electric and electronic applications. The common forms of MONEL 401 alloy are strip and wire. This datasheet will look into the chemical composition, properties and applications of MONEL 401 alloy.

Chemical Composition

The chemical composition of MONEL 401 alloy is given in the following table.

Element Content (%)
Nickel, Ni 40 – 45 max
Copper, Cu Remainder
Manganese, Mn 2.25 max
Iron, Fe 0.75 max
Silicon, Si 0.25 max
Cobalt, Co 0.25 max
Carbon, C 0.10 max
Sulfur, S 0.015 max

Physical Properties

The following table discusses the physical properties of MONEL 401 alloy.

Properties Metric Imperial
Density 8.89 gm/cm3 0.319 lb/in3

Mechanical Properties

The mechanical properties of MONEL 401 alloy are tabulated below.

Properties Metric Imperial
Tensile strength(annealed) 441 MPa 64 ksi
Yield strength 134 MPa 19 ksi

Other Designations

Some of the other designations that are used to denote MONEL 401 alloy are as below:-

  • UNS N04401

Fabrication

Machinability

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

Welding

Alloy 401 is readily autogenously welded into thin sections. Gas-tungsten-arc welding is the commonly used procedure. Resistance welding is a satisfactory method for this alloy.

Hot working

May be hot worked if needed.

Cold working

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

Annealing

MONEL 401 alloy should be annealed at 760°C (1400°F) for one hour for recovery from cold working.

Applications

The MONEL 401 alloy is used in the following applications:

  • Wire wound resistors
  • Bimetal contacts
  • Electric and electronic applications.

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