347H is a high-carbon variant of 347, stabilized with niobium (columbium) for superior high-temperature strength and creep resistance. It is designed for sustained service above 550°C in power generation and refining.
Key Properties
High Carbon: Higher carbon content provides enhanced creep and rupture strength above 550°C.
Stabilization: Niobium prevents sensitization during high-temperature exposure.
Weldability: Good weldability with standard methods.
Corrosion: Similar to 304 in mild environments.
Common Applications
Power Generation: Boiler superheater tubes and reheater piping supports.
Refining: Furnace components and high-temperature process piping hangers.
Aerospace: Afterburner components and exhaust system brackets.
Chemical: High-temperature heat exchangers and reactor internals.