Stainless steel forgings have excellent corrosion resistance, which is due to the high content of chromium inside the stainless steel, so that it forms a dense chromium oxide surface layer (passivation layer), which prevents further oxidation and corrosion. According to the specific stainless steel alloy composition and processing technology, the corrosion resistance will also be different. Common stainless steel forgings, such as Austenitic (Austenitic) stainless steel, Ferritic (ferritic) stainless steel, Martensitic (martensitic) stainless steel and Duplex (duplex) stainless steel, they all have a certain corrosion resistance. Among them, austenitic stainless steel has the advantages of full non-magnetic, corrosion resistance to general acid and alkali medium, and chloride ion corrosion resistance, and is widely used in chemical industry, food processing, medical equipment and other fields. Ferritic stainless steel has the characteristics of resistance to stress corrosion cracking and high temperature oxidation corrosion, which is suitable for high temperature equipment and petrochemical industry. Martensitic stainless steel has high hardness and strength, which is suitable for the manufacture of wear-resistant and impact-resistant parts. Duplex stainless steel has the characteristics of austenitic and ferrite two kinds of structures, combining the advantages of both, with high strength and corrosion resistance. In addition to the choice of stainless steel alloy, it is also necessary to consider the influence of forging process, surface treatment and other factors on the corrosion resistance. For example, temperature control and environmental protection in the forging process, as well as surface treatment such as passivation, plating and other measures will affect the corrosion resistance of stainless steel forgings. In general, stainless steel forgings have excellent corrosion resistance, but the specific corrosion resistance also needs to be evaluated and selected according to different materials and use environments.
