825 alloy is sometimes referred to as super austenitic stainless steel and is the long-term service pioneer of nickel-iron-chromium alloys. Together with molybdenum, copper and titanium, this alloy will provide excellent corrosion resistance for a broad base in harsh environments. It has good resistance to stress corrosion cracking, and the high nickel content used in combination with copper and molybdenum makes it excellent resistance to reducing environments (such as environments containing sulfuric acid and phosphoric acid). The chromium content in the alloy resists various oxidizing substances (such as nitric acid), while molybdenum also helps resist pitting and crevice corrosion. The alloy will also maintain its strength at low temperatures up to 400°C and higher. It is widely used in the chemical processing industry, but due to its excellent resistance to corrosive environments (especially seawater), it has become an excellent material for the offshore industry. The only disadvantage is its high iron content (22%), which makes it less resistant to alkalis. In825 can be easily used as a raw material in most shapes and sizes, and it is not a problem for machines, which makes its use cost generally cheaper than high nickel-chromium alloys.


  When faced with harsh corrosive environments, In825 may not be the final choice, but considering its cost and availability, it is undoubtedly the best among corrosion-resistant alloys.