Difference between Inconel and Incoloy

Inconel and Incoloy are known as high performance alloys. Both are of the same family of superalloys but both provide its own definite properties. It provides mechanical strength at elevated temperatures and high oxidation resistance and corrosion. The main difference between the two is in their composition. Inconel is mainly of nickel chrome and it generally contains over 50% of nickel, whereas incoloy contain less than 50% of nickel.

What is Inconel?

When Inconel is heated it forms a thick stable oxide layer which protects its outer surface form future attack. And this makes it ideal choice for pressure applications and extreme temperature. On the other hand steel and aluminum would succumb to thermal creep. It is available in various grades such as Inconel 600, 601, 617, 625, 690, 718, 725 and X-750. It exhibits shifting characteristics with slight variations in their chemistry.

Inconel typical applications include the food industry and heat treatment components. When Inconel is alloyed with other elements it’s further strengthening and stiffening allows its use in more demanding areas of chemical, aerospace and aerospace industries. Alloyed to its peak performance, Inconel then becomes the material of choice in most of the critical environments of rocket engines, nuclear industry components and rocket engines.

Chemical Properties of Inconel Alloy

Inconel Equivalent Material

Inconel Tensile Strength, Melting Point, and Density

What is Incoloy?

With the higher ferrous content and lower cost Incoloy makes it the ideal material in elevated temperature but less critical in applications. The further feature of incoloy is its relative ease of fabrication, employing the same machines and processes used for stainless steel. Incoloy has variety of grades such as Incoloy 800, 800H, 800HT, 825 and 945. It emphasis is more on resistance to aggressive forms of corrosion and particularly in aqueous environments. Incoloy has a widespread use, further alloying with enhancing elements gives added resistance to chemical and environmental corrosion, as well as physical deterioration, such as cracking and surface pitting.   

Excellent resistance to brine, high chloride environments, seawater and sour gas makes it a popular choice in the oil and gas industries. Incoloy is however widely used in the harshest chemical environments of all involving among others nuclear fuel, acids, wet scrubbing and the reactive atmospheres of furnaces.

Chemical Properties of Incoloy Alloy

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