Incoloy 825 high temperature alloy Steel

What is incoloy 825？

The high nickel content gives the Alloy Steel effective resistance to stress corrosion cracking. Corrosion resistance is good in a variety of media, such as sulfuric, phosphoric, nitric and organic acids, alkali metals such as sodium hydroxide, potassium hydroxide and hydrochloric acid solutions.Incoloy 825 higher overall performance is demonstrated in the corrosive medium of a variety of nuclear combustion dissolver, such as sulfuric acid, nitric acid and sodium hydroxide are handled in the same equipment.Incoloy 825 (UNS NO8825) Alloy Matching Alloy - A high Ni, highly corrosion-resistant nickel-based alloy with excellent corrosion resistance to both oxidizing and non-oxidizing acids.
Incoloy 825 alloy due to the rich content of Cr, Mo, Cu, oxidizing and non-oxidizing acids have good resistance to full corrosion performance. Especially for sulfuric acid has very high corrosion resistance. Due to the high content of Cr, Mo, Ni, in the chloride environment of the resistance to pitting corrosion performance, resistance to interstitial corrosion performance, resistance to stress corrosion cracking performance is excellent.Incoloy 825 alloy will control the carbon content in the very low level, welding is not easy to sensitization, and low susceptibility to intergranular corrosion.

825 chemical composition

Nickel Ni:38-46
Chromium Cr:19.5-23.5
Iron Fe: remainder
Carbon C: ≤0.025
Manganese Mn: ≤1.0
Silicon Si: ≤0.5
Molybdenum Mo:2.5-3.5
Copper Cu:1.5-3.0
Cobalt Co: ≤1.0
Aluminum Al: ≤0.2
Titanium Ti:0.6-1.2