Coballoy Alloy
4

Introduction

Solid Solution
Strengthened Alloy

Cobalt

Chromium

Tungsten

Corrosion
Resistance

87

Mechanical
Behavior

95

Purity

90

Overview

Coballoy 4 has similar carbon content to Coballoy 6 but with a higher tungsten content. This results in formation of tungsten carbides along with the chromium carbides for improves abrasion resistance.

The higher tungsten content results in a stronger matrix with improved high temperature properties. These properties along with a high chromium to carbon ration leaves more chromium in the matrix for higher corrosion resistance in oxidizing environments.

Coballoy 4 has excellent galling resistance, but is more brittle compared to Coballoy 6. This material is suitable for high temperature abrasion in corrosive environment.

Coballoy 4 has found use in applications involving corrosion and wear such pump sleeves and impellors. For high temperature wear the material has been used for dies in hot pressing or extrusion of copper and aluminium.

Corrosion Resistance

Coballoy 4 has higher corrosion resistance than Coballoy 6 in oxidizing environments such as nitric and sulphuric acids due to their higher chromium content in the cobalt rich matrix. The alloy has excellent resistance to manganese dioxide, carbon particles and ammonium zinc chlorides, used in the manufacturing of dry batteries.

Physical Properties

Mechanical Properties

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