321 is a titanium-stabilized austenitic stainless steel similar to 304 but with improved intergranular corrosion resistance after exposure to high temperatures. It is ideal for welding and high-temperature service.
Key Properties
Stabilization: Titanium prevents chromium carbide precipitation during welding.
High Temp: Good oxidation resistance up to 900°C.
Weldability: Excellent for heavy gauge welding without post-weld annealing.
Corrosion: Similar to 304 in mild environments.
Common Applications
Aerospace: Exhaust manifolds, firewalls, and aircraft components.
Refining: Catalytic cracking equipment and expansion joints.
Boilers: Superheater tubes and high-temperature piping.
Chemical: Welded vessels and heat exchangers.