Coballoy Alloy
31

Introduction

Solid Solution
Strengthened Alloy

Cobalt

Chromium

Nickel

Tungsten

Corrosion
Resistance

86

Mechanical
Behavior

87

Purity

92

Overview

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Coballoy 31 is a cobalt-base, high-temperature superalloy having high tensile and creep properties. It is superior in stress-rupture properties to many alloys commercially available, especially at 1700°F (926°C) and 1800°F (980°C).

Coballoy 31 is resistant to oxidizing and reducing atmospheres up to 2100°F (1150°C). It has excellent resistance to thermal and mechanical shock. Due to its high temperature properties, Coballoy 31 is often used in gas turbine engines in areas subject to hot gas erosion, as well as furnace working tools that require a combination of mechanical integrity and hot wear resistance.

Corrosion Resistance

Coballoy 31 is resistant to both oxidizing and reducing gases up to 2100°F (1150°C) and hence prevents scaling of gas turbine components. This alloy has excellent resistance to nitric and phosphorus acids, and at room temperature to sulfuric acid. Coballoy 31 is superior to Coballoy 6 in hydrochloric acid. Exposure test coupons should be used to verify performance when possible due to variations resulting from temperature, pH concentrations, and contamination.

Physical Properties

Mechanical Properties

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