incoloy alloys

Incoloy Alloys: A Comprehensive Guide

Incoloy alloys are known for their iron content. Nickel, iron, and chromium are the main and vital ingredients for Incoloy alloys.

Incoloy alloys have more iron contents than inconel alloys. These alloys show outstanding corrosion resistance, strength, durability, and high-temperature stability.

Nickel is an essential metal that is in limited availability for the development of the Incoloy alloy.

Therefore, there is a need for an alloy that has lower nickel contents but is not inferior in properties like high-temperature corrosion resistance and durability, so the incoloy is the best choice for this demand. It makes extensive use of iron to substitute nickel.

Although its corrosion resistance is not as good as that of Inconel alloy, it is suitable in many circumstances and is less expensive.

Overall, Incoloy alloy is less expensive than Inconel alloy.

In this article, you will discover the characteristics, advantages, and applications of the Incoloy alloys.

Incoloy Alloy 800
Incoloy Alloy 800H
Incoloy Alloy 800HT
Incoloy Alloy 825
Incoloy Alloy 925
Incoloy Alloy A-286
Incoloy Alloy 330

Characteristics of Incoloy Alloys

Incoloy alloys have some excellent characteristics due to the nickel-chromium and iron used as primary elements in their compositions, with some other secondary elements.

Some common characteristics of Incoloy alloys are given below:

  • The high-temperature strength resistance of Incoloy alloy is very exceptional.
  • These alloys can maintain their excellent resistance to oxidation and carburization at high temperatures
  • Excellent creep-rupture strength
  • Due to the more iron contents, this type of alloy allows the fabrication simplicity.

Incoloy alloy has a lower density than Inconel alloy because of its lower nickel percentage and higher iron content. This fact minimizes the cost of Incoloy alloy to some extent than Inconel alloy.

Special Properties of Incoloy Alloys

Incoloy alloys have a nickel-iron-chromium composition that provides good strength as well as exceptional resistance to carving and oxidation in high-temperature environments.

According to their microstructure, Incoloy alloys are classified into two categories: solid solution-strengthened alloys and precipitation-strengthened alloys.

Mechanical Properties

Mechanical properties of some important incoloy alloys are given in the following table;


Tensile strength


Yield strength




Incoloy 800




Incoloy 825




Incoloy 908




Incoloy A-286




Physical properties

Physical properties of some common incoloy alloys are given below:




Melting range


Specific Heat


Incoloy 800


1357 to 1385


Incoloy 825


1370 to 1400


Incoloy 908


1361 to 1410


Incoloy A-286


1370 to 1430


Uses And Applications of Incoloy Alloys

Power generation

Several ways are available for power generation, like hydropower, thermal power, gas power, and nuclear power. Other power generation technologies, in addition to hydropower, demanded high-temperature materials. Nuclear power is one of the most extensively used superalloy power generation techniques.

There is a highly dangerous environment in addition to the extremely high temperature within the nuclear reactor. As a result, nickel alloys play an indispensable role in the design of nuclear reactors.


With the advancement of the vehicle industry, Incoloy alloys are increasingly being used to enhance the efficiency of automobiles. Superalloys are now commonly utilized in automobile components such as turbochargers, exhaust valves, exhaust gas cleaner fasteners, ignition pre-chambers, and nozzles.

Chemical processing

Mostly, chemical reactions are carried out in metal containers in chemical processing industries. Various chemical reactions, of course, require various temperatures. Nickel alloys, especially Incoloy, can resist the corrosion of many chemical agents and have excellent mechanical properties at both low and high temperatures. As a result, it is the most widely utilized substance in the chemical industry.


Incoloy alloys are most commonly utilized in the aerospace industry. It is not easy to ensure that various components in aircraft engines can function normally at different temperatures and in different circumstances. Nickel-based alloys, such as Incoloy alloys, are currently the best materials for high-temperature applications due to their superior corrosion resistance and mechanical qualities.

Costs of Incoloy Alloys

The cost of Inconel alloys is more than incoloy alloys because the Inconel alloys have more than 50% nickel contents. This concentration of nickel makes it more expensive than Incoloy. Incoloy alloys have more than 50% iron content, making them less costly and easy to purchase than Inconel alloys.

Advantages of Incoloy Alloys

  1. Incoloy alloys have excellent Mechanical qualities at both room and high temperatures up to about 1000°F.
  2. These alloys show exceptional resistance to reducing and oxidizing acids.
  3. Excellent stress-corrosion cracking resistance
  4. Strong creep rupture strength
  5. Various grades of Incoloy alloys show excellent resistance to various atmospheres containing sulfur.
  6. High-temperature endurance
  7. Incoloy alloys are also available in the following forms: pipes, tubes, sheets, bars, and flanges.

The Difference Between Inconel And Incoloy Alloys

These alloys are most widely used in many industries due to their excellent properties. The composition is the key difference between Inconel and Incoloy alloys.

The most significant distinction between these two superalloys is their composition. Inconel is a nickel-chrome alloy that contains more than 50% nickel.

Incoloy is a nickel-iron-chromium alloy with a nickel content of less than 50% and iron content of more than 50%. Other distinctions between these alloys include their applications and compatibility.


Overall, all the grades of Incoloy alloys are very useful and play a key role in the industry.

Incoloy alloys offer outstanding corrosion resistance, high temperatures, strength, and outstanding mechanical properties.

The successful and dependable use of Incoloy alloys in specific applications requires proper selection of grade, handling, and understanding of their limitations.

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