The maximum long-term service temperature of Incoloy 825 alloy

1. What is the maximum long-term service temperature of Incoloy 825 alloy plates?

The maximum long-term service temperature of Incoloy 825 alloy plates is approximately 540 °C (1000 °F). This nickel-iron-chromium superalloy is formulated with additions of molybdenum, copper and titanium, which endow it with excellent high-temperature stability, oxidation resistance and stress corrosion cracking resistance. When operating below this temperature threshold, the alloy can maintain its mechanical properties and structural integrity for an extended period, making it suitable for applications such as heat exchangers, chemical processing equipment and offshore oil and gas components.

2. Which heat treatment process is required to restore the ductility of cold-worked Incoloy 825 alloy plates?

Cold-worked Incoloy 825 alloy plates need to undergo a solution annealing treatment to recover their ductility. The specific process parameters are as follows:

Heating temperature: Heat the alloy plates to a temperature range of 925–1010 °C (1700–1850 °F).

Holding time: Keep the temperature for 30–60 minutes (the duration is determined by the thickness of the plates, with thicker plates requiring a longer holding time to ensure uniform heating of the material).

Cooling method: Adopt rapid cooling (water quenching is preferred). This step can inhibit the precipitation of harmful intermetallic phases and carbides, retaining the alloy in a single austenitic phase state, thus effectively restoring the ductility, toughness and corrosion resistance of the cold-worked alloy plates that were reduced due to work hardening.

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