Monel Alloy
R-405

Introduction

Solid Solution
Strengthened Alloy

Nickel

Copper

Corrosion
Resistance

87

Mechanical
Behavior

62

Purity

79

Overview

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MONEL® nickel-copper alloy R-405 (UNS N04405) is the free-machining grade of alloy 400. Its greater sulfur content enhances machinability. It has essentially the same corrosion resistance and physical properties as alloy 400, but a slightly different range of mechanical properties. Alloy R-405 is used chiefly for automaticscrew- machine stock and is not generally recommended for other applications.

Alloy R-405 is approved as a material of construction under Section VIII (Pressure Vessels - Division 1) of the ASME Boiler and Pressure Vessel Code and in Section III, Nuclear Vessels, of the Code.

MONEL alloy R-405 is fabricated, pickled and heat-treated by the same procedures as for alloy 400. The alloy is not recommended for forging.

MONEL alloy R-405 was especially developed for good machinability and is recommended for use with automatic screw machines. The nickel-copper sulfides resulting from the sulfur in its composition act as chip breakers. Because of these inclusions the surface finish of the alloy is not as smooth as that of MONEL alloy 400.

Physical Properties

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