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Alloy 825 (UNS N08825)

W.Nr. 2.4858


An Nickel-Iron-Chromium Alloy Developed for Exceptional Corrosion Resistance In Both Oxidizing and Reducing Environments


General Properties
Alloy 825 (UNS N08825) is an austenitic nickel-iron-chromium alloy with additions of molybdenum, copper and titanium. It was developed to provide exceptional resistance to numerous corrosive environments, both oxidizing and reducing.

The nickel content of Alloy 825 makes it resistant to chloride stress-corrosion cracking, and combined with molybdenum and copper, provides substantially improved corrosion resistance in reducing environments when compared to conventional austenitic stainless steels. The chromium and molybdenum content of Alloy 825 provides resistance to chloride pitting, as well as resistance to a variety of oxidizing atmospheres. The addition of titanium stabilizes the alloy against sensitization in the as-welded condition. This stabilization makes Alloy 825 resistant to intergranular attack after exposure in the temperature range which would typically sensitize un-stabilized stainless steels.

Incoloy 825 is resistant to corrosion in a wide variety of process environments including sulfuric, sulfurous, phosphoric, nitric, hydrofluoric and organic acids and alkalis such as sodium or potassium hydroxide, and acidic chloride solutions.

The fabrication of Alloy 825 is typical of nickel-base alloys, with material readily formable and weldable by a variety of techniques.


Product forms of Incoloy 825
Pipe & Tube (welded & seamless)
Fittings (i.e. flanges, slip-ons, blinds, weld-necks, lapjoints, long welding necks, socket welds, elbows, tees, stub-ends, returns, caps, crosses, reducers, and pipe nipples)



Air Pollution Control
Chemical Processing Equipment
Food Process Equipment
Fuel Reprocessing
Fuel Element Dissolvers
Waste Handling
Offshore Oil and Gas Production
Seawater Heat Exchangers
Piping Systems
Sour Gas Components
Ore Processing
Copper Refining Equipment
Petroleum Refining
Air-cooled Heat Exchangers
Steel Pickling Equipment


ASTM.......................... B 424
ASME.......................... SB 424


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