347 is a niobium-stabilized austenitic stainless steel offering excellent resistance to intergranular corrosion after exposure to high temperatures. It is ideal for welding and moderate high-temperature service up to 900°C.
Key Properties
Stabilization: Niobium prevents chromium carbide precipitation during welding and heating.
High Temp: Good oxidation resistance up to 900°C intermittent service.
Weldability: Excellent for heavy gauge welding without post-weld annealing.
Corrosion: Similar to 304/304L in mild environments.
Common Applications
Aerospace: Jet engine components, exhaust systems, and firewall brackets.
Refining: Catalytic cracking equipment, expansion joints, and furnace hangers.
Boilers: Moderate temperature superheater tube supports and piping.
Chemical: Welded vessels, heat exchangers, and reactor internals.