321 is a titanium-stabilized austenitic stainless steel offering superior resistance to intergranular corrosion after exposure to temperatures between 425-860°C, making it ideal for welded components and moderate high-temperature service.
Key Properties
Stabilization: Titanium addition prevents chromium carbide precipitation during welding and heating.
High Temp: Good oxidation resistance up to 860°C intermittent service.
Weldability: Excellent for heavy gauge welding without post-weld annealing.
Corrosion: Similar to 304 in mild environments, superior in oxidizing acids.
Common Applications
Aerospace: Jet engine exhaust manifolds, expansion joints, and afterburner components.
Petrochemical: Process piping, heat exchanger tubes, and reactor internals.
Power Generation: Boiler components, superheater tube supports, and chimney liners.
Chemical: Welded vessels, storage tanks, and acid handling equipment.