the heat treatment of incoloy 825 2.4858 N08825 round bar
Incoloy 825 is stable annealed at 940°C. The softest structure was obtained at 980°C. Sections heavier than sheet, strip and wire should be quenched to avoid sensitivity.
INCOLOY Alloy 825 is a durable material even under extreme operating conditions. This powerful nickel alloy is considered a precursor to alloys containing molybdenum, the addition of which gives the material extra strength.
The alloy’s chemical composition provides excellent resistance to many corrosive environments. The nickel content is sufficient to resist chloride ion stress corrosion cracking. Nickel, in combination with molybdenum and copper, also has excellent resistance to reducing environments such as those containing sulfuric and phosphoric acids.
Nickel-chromium-molybdenum alloys such as INCOLOY alloy 825 are usually solution annealed at elevated temperatures before use. However, stable alloys provide the best corrosion resistance after annealing at lower temperatures. This process is often referred to as “stabilization annealing”. This is the standard supply condition for INCOLOY Alloy 825 products and is the key to the successful manufacture of the alloy. No matter how carefully a material is shaped and welded, if the material is not properly stabilized, it will not perform at its maximum.
Choosing the right annealing temperature for the intended end use is key here. It helps maintain the high corrosion resistance required, for example, in the chemical processing industry. During the final stages of work and annealing, the temperature should be limited to 1700-1800°F (930-980°C). The optimum temperature for stability is considered to be 1725°F (940°C).
Stabilizing annealing heat treatments for alloys lead to optimal performance when unstable alloys are exposed to intergranular grain boundary attack.
