UNS N08825, Alloy 825, W.Nr. 2.4858, Incoloy® 825
Note that the designation “ Incoloy®” is registered trademarks of the Special Metals Corporation group of companies. 

UNS N08825 is a nickel-iron-chromium alloy with additions of molybdenum, copper, and titanium, and provide exceptional resistance to many corrosive environments. The alloy's high nickel content makes it enough to resist chloride-ion stress-corrosion cracking. The combination of nickel, molybdenum and copper gives it outstanding resistance to reducing environments such as those containing sulfuric and phosphoric acids. The molybdenum also aids resistance to pitting and crevice corrosion.  In addition, The titanium addition serves, with an appropriate heat treatment, to stabilize the alloy against sensitization to intergranular corrosion.  

Incoloy 825 is distinguished by its corrosion resistance and is particularly suitable for use in sulfuric acid, phosphoric acid, sour flue gases, sour gases and oil wells, as well as seawater. In both reducing and oxidize environments, the alloy resists general corrosion, pitting, crevice corrosion, intergranular corrosion, and stress-corrosion cracking. 

Incoloy 825 products are heat treated during manufacturing at the mill to develop the optimum combination of stabilization, corrosion resistance, mechanical properties, and formability. To maintain these properties during fabrication, subsequent anneals should be performed between 1700 to 1800°F (930 to 980°C) followed by rapid air cooling or water quenching. 

Incoloy 825 can undergo heating and pickling processes to remove scale, oxides, and other impurities from its surface. Heating and pickling are typically performed as a part of the fabrication or maintenance process to ensure the material's cleanliness and enhance its corrosion resistance. It's important to note that the heating and pickling process for Alloy 825 should be carried out in a controlled and well-ventilated environment, following proper safety protocols. The specific parameters and procedures may vary based on the scale thickness, the equipment available, and the recommendations of the pickling solution manufacturer. It's advisable to consult the manufacturer's guidelines or seek expert advice to ensure the appropriate heating and pickling process for Alloy 825 in your specific application.

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