321 stainless steel is a type of austenitic stainless steel that contains titanium as a stabilizing element. It is similar to 304 stainless steel, but with improved corrosion resistance, particularly in high-temperature environments. The addition of titanium also prevents the formation of chromium carbide during welding, which can cause intergranular corrosion and reduce the material’s durability.

321 stainless steel is commonly used in applications that require high-temperature resistance, such as aircraft exhaust systems, jet engine parts, and chemical processing equipment. It is also used in the manufacturing of equipment for the food and beverage industry, as it is resistant to corrosion from organic acids and fats.