High Temp Metals INCOLOY 825, UNS N08825, AFNOR NC 21 FeDU, BS NA 16, DIN NiCr21Mo, Werkstoff Nr 2.4858, EN 2.4858.
Incoloy 825 is designed to resist a variety of vigorous corrosive media such as sulfuric and phosphoric acids, nitric acid, nitrates and oxidizing salts. It offers better aqueous corrosion resistance than alloy 800 and good resistance to chlorine based conditions. Alloy 825 contains significant magnitude of chromium and molybdenum that offer wide resistance to all magnitudes of HCl below 40C or 100F. Incoloy 825 has outstanding resistance to marine water. As it prevents sensitization, it remains unaffected from intergranular attack.
Incoloy 825 has stable austenitic structure, it significantly prevents pitting, crevice corrosion and intergranular attack. The presence of high nickel and other crucial elements such as molybdenum and copper increases resistance to various oxidizing agents.
It is also authenticated for production of pressure vessels for service temperatures up to 538C.
Ni-Cr-Fe super alloy 825 has fine mechanical properties from medium to elevated temperatures. The hot processing limit for this alloy is up to 2150F. It is easily weldable by whole traditional techniques like shielded metal arc and gas shielded metal arc welding.
Incoloy 825 Formation
Inco825 metal is easily hot and cold processed, where hot processing is done up to 1180C and finishing to 980C. The hot processed components are annealed before installation to provide the greatest corrosion resistance. The alloy is easily weldable by GMAW, (MIG), GTAW (TIG), SMAW and SAW.
Alloy 825 is tough to shape and machine with the conventional methods because of its quick work hardening. It possesses special set of mechanical characteristics; therefore it is widely used as – forged shafts, pipes, tubes, pressure vessel, heat exchanger tubing, flanges, tanks, towers, preheaters, etc.
Extensive exposure of the alloy 825 above 1000F may cause noticeable fall in ductility and other mechanical properties. Nickel 825 is not preferred for use in the applications that are completely based on creep rupturing properties.
Incoloy 825 Applications:
Nuclear fuel retreatment, acid manufacture, pickling apparatus, oil & gas well pipes, pollution control systems, chemical processing, radioactive waste treatment, hot tubing for food and seawater, marine exhausts, pressure tubes, pickling units, propeller shafts, expansion bellows and electricity generation units. |
