Incoloy 890 Introduction

Solid Solution
Strengthened Alloy

Nickel

Iron

Chromium

Corrosion
Resistance

81

Mechanical
Behavior

68

Purity

77

Overview

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INCOLOY® alloy 890 (UNS N08890) is the latest addition to the INCOLOY alloy family of heat resistant alloys. Alloy 890 joins the existing INCOLOY products in offering high strength along with excellent resistance to oxidation, carburization, and sulfidation at temperatures up to 2200°F (1200°C).

Alloy 890 offers the high chromium content of alloy 803 along with enhanced properties from additions of silicon, molybdenum, and niobium. Alloy 890 is protected by United States Patent Number 5,873,950 dated February 23, 1999.

INCOLOY alloy 890 is a solid-solution, single phase alloy. It is normally supplied in the annealed condition. Annealing alloy 890 is accomplished by heating to a temperature between 2050 and 2200°F (1121 and 1204°C), holding for a time commensurate with section thickness, followed by rapid cooling in air or water quenching. Alloy 890 can be sensitized by carbide precipitation when exposed to intermediate temperatures for extended periods of time. However, sensitization of materials such as alloy 890 which are primarily used at elevated temperatures is not generally considered a significant problem since conditions to cause aqueous corrosion are not often encountered.

Mechanical Properties

INCOLOY alloy 890 is supplied in the annealed condition. The tensile and yield strength values of alloy 890 at ambient and elevated temperatures are approximately the same as those of alloy 803 and slightly higher than values for alloy 800HT®. Like alloy 803 it is strengthened by its content of chromium and carbon. However, alloy 890 is further strengthened, especially at very high temperatures, by molybdenum and niobium.

Corrosion Resistance

By virtue of its chromium and silicon contents, alloy 890 offers the greatest resistance to attack at elevated temperatures of any of the INCOLOY family of alloys. It is seen that alloy 890 outperforms even alloy 803, which is well known for its resistance to attack in carburizing environments. Again, alloy 890 offers significantly superior performance.

Physical Properties

Mechanical Properties