Coballoy Alloy
3

Introduction

Solid Solution
Strengthened Alloy

Cobalt

Chromium

Tungsten

Corrosion
Resistance

88

Mechanical
Behavior

95

Purity

92

Overview

Coballoy 3 is an alloy possessing excellent abrasion and corrosion resistance for applications such as pump sleeves, rotary seal rings, wear pads, expeller screws and bearing sleeves. It retains its hardness at temperatures in excess of 760°C.

The high carbon content of this alloy increases the volume fraction of carbides and hence its abrasion and solid particle erosion resistance. The high tungsten content improves its high temperature properties. It has excellent metal-to-metal wear resistance and resists galling when mated with other Coballoy alloys.

Coballoy 3 is well suited to applications involving extreme lowangle erosion and severe abrasion, with some sacrifice in toughness. The equivalent of Coballoy 3 for hardfacing materials like powders is known as Coballoy 1.

Corrosion Resistance

Coballoy 3 has excellent resistance to oxidation but is not recommended for reducing acids. The typical electrode potential in sea water at room temperature is approx. -0.4 V (SCE). Coballoy 3 corrodes primarily by a pitting mechanism and not by general mass loss in seawater and chloride solutions.

Physical Properties

Mechanical Properties

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