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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.

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

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

The mechanical properties of MONEL 404 alloy are tabulated below.

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

• UNS N04404

• ASTM F96

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

Alloy 404 is can be welded using common welding techniques.

This alloy cannot be hot worked.

Alloy 404 can be forged.

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

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

The MONEL 404 alloy is used in the following applications:

• -Capsules for transistors

• -Ceramic to metal sealing