Description
INCOLOY -825
Among other things, Incoloy Alloy 825 is very resistant to sulfuric and phosphoric acids. Incoloy 825 is very resistant to rust. It has a lot of nickel in it, which makes it resistant to chloride ion stress corrosion cracking. It also has a very stable austenite structure. There is a lot of molybdenum and copper in the alloy, which makes it able to withstand acids and reducing agents. Chromium is resistant to oxidising conditions such as nitric acid solutions, nitrates, and oxidising salts. They can't damage chromium, which makes it resistant to these things.
In order to resist pitting and intergranular attack after fabrication, particularly welding, which includes heating in the critical sensitisation temperature range (650 °C – 760 °C), the alloy has been titanium stabilised. 525°C (AS1210, AS4041) and 538°C (AS4041) are the operating temperatures for Incoloy 825 pressure vessels, respectively (ASME Boiler & Pressure Vessel Code, Sections I, III, VIII, IX, Cases 1936, N-188).
