What is Incoloy material?

Incoloy is a registered trademark of Special Metals Incorporated and is applied to a family of 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.

The high nickel content ensures resistance to stress corrosion cracking, and a wider temperature operating range than many stainless steels. Alloying with chromium provides increased resistance to a wide range of acids such as nitric acid and sulphuric acid.

Incoloy 825 was brought to the market in 1952, building upon Incoloy 800 to better resist sulphuric acid. For many years it was the default choice of metal for the handling of sulphuric acid. This resistance to sulphuric acid is provided by the addition of copper to this alloy, an effect also exploited in Ferralium 255 super duplex stainless steel (containing 2% copper addition) and the much more highly alloyed Alloy 20 (3-4% copper).

Incoloy 925 was developed in 1982, specifically to increase the strength of Incoloy 825. The composition of Incoloy 925 is very similar, therefore the level of corrosion resistance is the same. However, small additions of titanium and aluminium are made. These provide precipitation-strengthening after an additional heat treatment process, pushing the strength up by factor of 3-4.

Langley Alloys stocks Alloy 825 and Alloy 925 as round bars from 5/8”-10” diameter (15.87-254mm). Pipes and hollow bars are also available.


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