330H Stainless Steel: High-Strength Heat Resistant Alloy

 

What defines 330H's chemical composition?​

It contains 17-20% chromium, 34-37% nickel, and 0.30-0.40% carbon, with small amounts of manganese and silicon. The higher carbon content boosts high-temperature strength compared to standard 330, while nickel stabilizes the austenitic structure.​

 

How does 330H perform under extreme heat?​

330H excels in continuous use up to 1800°F (982°C) and intermittent use up to 2000°F (1093°C). Its high carbon content enhances creep resistance, making it suitable for load-bearing parts in high-heat environments like furnace components.​

 

What are its corrosion resistance properties?​

It offers good resistance to oxidation and carburization at high temperatures. However, its general corrosion resistance in aqueous or chemical settings is lower than 304 or 316, limiting it to high-temperature, low-corrosion applications.​

 

How does 330H handle fabrication and welding?​

330H is weldable with preheating and post-weld annealing to prevent cracking. It has moderate formability but work-hardens more than standard 330, requiring occasional annealing during cold working to maintain ductility.​

 

What are 330H's typical applications?​

Commonly used in furnace retorts, heat-treating baskets, and kiln components that bear loads at high temperatures. It's also found in industrial ovens and petrochemical processing equipment where strength under heat is critical.