What is the difference between Inconel and Incoloy?

Inconel and Incoloy are two different families of nickel-based alloys originally developed by special Metals Incorporated (who own the Inconel and Incoloy trademarks).

Incoloy grades are nickel-based alloys primarily alloyed with chromium. There are more than ten different grades currently named within the Incoloy family, but the two most widely used Incoloy grades are Incoloy 825 and Incoloy 925.

Inconel grades are nickel-based alloys, again primarily alloyed with chromium. However, their nickel content is generally much higher than Incoloy grades, providing improved performance at higher temperatures where they retain more of their strength. However, due to this increased nickel content compared with Incoloy alloys, they are typically more expensive. There are up to twenty different grades within the Inconel family, but Inconel 718 and Inconel 625 are perhaps the most widely known and used.

Inconel 625 is lower strength but has excellent corrosion resistance to a wide range of aggressive environments, meaning that it is commonly used in components for the chemical processing industry. Inconel 725 is similar to Inconel 625 in terms of composition and therefore corrosion resistance. However, subtle alloying additions and an additional heat treatment process push double its strength.

Inconel 718 is a much higher strength grade, with most of that strength retained at high temperature. Therefore, it is used extensively in aerospace applications such as turbines, plus an array of Oil and Gas end uses.

Langley Alloys stocks Alloy 625 and Alloy 718 as round bars from 5/8”-10” diameter (15.87-254mm), and Alloy 725 as round bars from 1”-4” diameter (25.4-101.6mm).


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