Description
INCOLOY -925
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).
Nickel is enough to protect against chloride-ion stress corrosion cracking. The nickel, with the molybdenum and copper, is also very resistant to chemicals that break down metals. Molybdenum helps protect against corrosion in pits and crevices. The alloy is resistant to oxidising environments because it has a lot of chromium in it. The addition of titanium and aluminium causes the metal to become stronger when it is heated.
