Alloy 825 is a nickel-iron-chromium solid solution strengthened alloy added with molybdenum, copper and titanium invented by Inco. It was developed for use in both reducing and oxidizing media. The alloy has resistance to chloride ion stress corrosion cracking, resistance to pitting corrosion, crevice corrosion and many corrosive solutions. This kind of alloy in China belongs to corrosion-resistant alloy, and its brand is NS142.
Compared with other Ni-based superalloys, alloy825 has many advantages. It is a versatile engineering alloy that has resistance to acid and alkali metals in both oxidation and reduction environments. Alloy 825 can resist the corrosion of chemicals with a wide range of oxidation resistance, such as nitric acid solution, nitrate, divalent copper salt, ferric iron salt and mercury salt, except chloride. Alloy 825 is also resistant to the attack of many acids and mixed acids of oxidizing and reducing chemicals. It has a higher nickel content, plus molybdenum and copper, making it more suitable for resistance to hot sulfuric acid, sulfurous acid and phosphoric acid solution than any ordinary stainless steel. Chromium greatly improves the corrosion resistance of the alloy in oxidizing media such as nitric acid, nitrate, and oxidizing salts. It can resist the corrosion of nitric acid solution of almost all concentrations and temperatures. Through proper heat treatment, titanium can make the alloy more resistant to intergranular corrosion. The alloy is stabilized by the addition of titanium, and due to the low carbon content, it avoids the corrosion of the carbides in the heat-affected zone of welding in normal use in the corrosive environment. The nickel content of the alloy is sufficient to resist the stress corrosion cracking of austenite.
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Post time: Apr-14-2020