s225 alloys have good properties of resistance to reactive gas, caustic medium, and corrosion resistance of reducing acid medium, and have the characteristics of high strength, good plasticity, hot and cold deformation, processing and welding, and are widely used in petrochemical industry. , metallurgy, atomic energy, marine development, aviation, aerospace and other industries, it is a very important corrosion-resistant metal material to solve engineering corrosion problems that general stainless steel and other metals and non-metallic materials cannot solve.