Inconel Alloy 600 vs Incoloy Alloy 800

inconel alloy 600 vs incoloy alloy 800

Whether you are a supplier or a end user of Inconel and Incoloy alloys, you may face challenges when deciding between Inconel 600 and Incoloy 800 alloy or advising customers on material selection.

Inconel 600 and Incoloy 800 are widely utilized superalloys with comparable performance characteristics. However, Inconel 600 outperforms Incoloy 800 in all aspects. Conversely, Incoloy 800 offers a more economical price point and can serve as a substitute for Inconel 600 in certain applications.

In this article, we will provide a detailed comparison of the performance characteristics between Inconel 600 and Incoloy 800.

What is Incoloy Alloy 800?

INCOLOY alloy 800 (UNS N08800 / W.Nr. 1.4876) is a widely used material for construction of equipment requiring corrosion resistance, heat resistance, strength, and stability for service up to 1500°F (816°C). Alloy 800 offers general corrosion resistance to many aqueous media and, by virtue of its content of nickel, resists stress corrosion cracking. At elevated temperatures it offers resistance to oxidation, carburization, and sulfidation along with rupture and creep strength.

incoloy 800

Inconel Alloy 600 vs Incoloy Alloy 800 Chemical Composition

Here’s a comparison table for the chemical composition of Inconel 600 and Incoloy 800:

 
inconel alloy 600 vs incoloy alloy 800 chemical composition

Inconel Alloy 600 vs Incoloy Alloy 800 Corrosion Resistance

Incoloy 800 incorporates more iron for cost efficiency, while containing less nickel compared to Inconel 600. This lower nickel content inherently reduces its corrosion resistance.

To mitigate this, Incoloy 800 is enriched with additional chromium to enhance its oxidation resistance. It also includes aluminum, further bolstering its resistance to high-temperature corrosion.

In summary, Inconel 600 exhibits superior oxidation resistance compared to Incoloy 800.

Inconel Alloy 600 vs Incoloy Alloy 800 Mechanical Behavior

Inconel 600 and Incoloy 800 are both solid solution strengthened alloys, relying primarily on chromium and iron for this purpose.

In these alloys, solid solution strengthening elements dissolve into the austenite matrix, and the amount of austenite present is crucial for their strengthening effect. Higher nickel content promotes a more austenitic structure in the alloy.

Despite Incoloy 800 containing additional strengthening elements, its higher iron and lower nickel content compared to Inconel 600 result in a lower proportion of austenite.

As a result, generally speaking, Inconel 600 exhibits better mechanical properties than Incoloy 800.

Inconel Alloy 600 vs Incoloy Alloy 800 Physical Properties

 
 Inconel 600Incoloy 800
Density, g/cm³8.477.94
Density, lb/in.³0.3060.287
Melting Range, °F2470-25752475-2525
Melting Range, °C1354-14131357-1385
Curie Temperature, °F-192-175
Curie Temperature, °C-124-115

Inconel Alloy 600 vs Incoloy Alloy 800 Application

The Inconel 600 alloy is used extensively in the chemical industry for its strength and corrosion resistance. Applications include heaters, stills, bubble towers and condensers for processing of fatty acids; evaporator tubes, tube sheets and flaking trays for the manufacture of sodium sulfide; and equipment for handling abietic acid in the manufacture of paper pulp.

INCOLOY alloy 800 is used in a variety of applications involving exposure to corrosive environments and high temperatures. It is used for heat-treating equipment such as baskets, trays, and fixtures. In chemical and petrochemical processing, the alloy is used for heat exchangers and other piping systems in nitric acid media especially where resistance to chloride stress-corrosion cracking is required. In nuclear power plants, it is used for steam-generator tubing. The alloy is often used in domestic appliances for sheathing of electric heating elements. In the production of paper pulp, digester-liquor heaters are often made of alloy 800. In petroleum processing, the alloy is used for heat exchangers that air cool the process stream.

Inconel Alloy 600 vs Incoloy Alloy 800 Main Standards

Here’s a comparison table for the standards of Inconel alloy 600 and Incoloy 800:

inconel alloy 600 vs incoloy alloy 800 main standards

Inconel Alloy 600 vs Incoloy Alloy 800 Cost

Despite Incoloy 800 generally being inferior to Inconel 600 in most aspects, its lower cost makes it a preferable choice in situations where performance requirements are not as demanding.

Conclusion

Inconel 600 is a high-performance superalloy renowned for its exceptional resistance to high-temperature corrosion. Incoloy 800, introduced after Inconel 600, serves as a more economical alternative.

Inconel 600 generally outperforms Incoloy 800 in most aspects. Your choice between these two alloys should be based on the specific requirements of your project.

HZW manufactures high-quality Inconel 600 and Incoloy 800. Please feel free to contact us if you have any needs related to these alloys.

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