321 Stainless Steel

321 stainless steel is a titanium-stabilized austenitic stainless steel developed to improve resistance to intergranular corrosion, especially after exposure to high temperatures. The addition of titanium stabilizes the alloy by preventing chromium carbide precipitation during welding or thermal cycling, ensuring consistent corrosion resistance and structural integrity. It offers excellent performance in high-temperature environments, making it widely used in aerospace components, exhaust systems, heat exchangers, furnace parts, and chemical processing equipment. Compared with 304 stainless steel, 321 provides better thermal stability and longer service life under elevated temperature conditions. It is supplied in coil form under standards such as ASTM A240/A240M. 321 stainless steel is the go-to titanium-stabilized grade for aerospace exhaust systems and high-temperature furnace components, offering better thermal stability than 304 or 304L under repeated heat cycling.