625 alloy shows excellent corrosion resistance in many media. It has excellent resistance to pitting corrosion, crevice corrosion, intergranular corrosion and corrosion in chloride medium. It has good corrosion resistance to inorganic acids, such as nitric acid, phosphoric acid, sulfuric acid, hydrochloric acid, etc. it also has corrosion resistance to alkali and organic acids in oxidation and reduction environment. Effective resistance to chloride reductive corrosion cracking. There is almost no corrosion in seawater and industrial gas environment, and it has high corrosion resistance to seawater and salt solution, even at high temperature.