What is Alloy 825?

Alloy 825 is a nickel-based alloy, meaning the largest element present is nickel, at 38-46% of the total. It also contains iron, chromium, and molybdenum, but in lower proportions.

Alloy 825 is more commonly known as Incoloy 825, where Incoloy is a registered trademark of Special Metals Incorporated and is applied to a group of nickel-based alloys, primarily alloyed with chromium. Incoloy 825 was introduced in 1952, based on Incoloy 800 for its better resistance to sulfuric acid. For many years, it was the default metal of choice for handling sulfuric acid. The high nickel content ensures resistance to stress corrosion cracking and a wider temperature operating range than many stainless steels. Nickel is an expensive alloying additive, but Alloy 825 has a lower nickel content than most other nickel-based alloys. As a result, it has been widely used in applications where cheaper stainless steels are not suitable.

In composition, Alloy 925 is almost identical to Alloy 825. However, the addition of small amounts of titanium and aluminum, along with additional heat treatment, results in precipitation strengthening. The very small precipitates that form and help “pin” the microstructure of the metal when subjected to external loads, increase the strength and toughness of the metal. As a result, Alloy 925 can provide 3-4 times the tensile strength of an equivalent composition provided by Alloy 825.

Apmetal supplies Alloy 825 in round bar from 5/8”-10” (15.87-254mm) diameter, and is also available in tubing and hollow bars.

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