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 one of the most widely known is Incoloy 825.
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. The high nickel content ensures resistance to stress corrosion cracking, and a wider temperature operating range than many stainless steels.
Inconel and Incoloy are two different families of nickel-based alloys originally developed by Special Metals Incorporated (who own the Inconel and Incoloy trademarks). There is no such thing as Inconel 825.
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.
Langley Alloys stocks Alloy 825 as round bars from 5/8”-10” diameter (15.87-254mm). Pipes and hollow bars are also available.