321H Stainless Steel: High-Temperature Stabilized Alloy

 

What's unique about 321H's chemical composition?​

It contains 17-19% chromium, 9-12% nickel, 0.10-0.15% carbon, and titanium (5×C min). The higher carbon compared to standard 321 boosts high-temperature strength, while titanium stabilizes against carbide precipitation, preventing intergranular corrosion.​

 

How does 321H perform under high temperatures?​

321H retains strength well up to 1500°F (816°C), making it suitable for high-heat, load-bearing components. It resists oxidation and scaling in continuous high-temperature use, outperforming 304H in cyclic heat environments.​

 

What are its corrosion resistance properties?​

It offers similar corrosion resistance to 321, with excellent resistance to intergranular corrosion after welding. The titanium stabilizer ensures it performs well in both high-heat and mild chemical environments, though it's less resistant to chlorides than 316.​

 

How does 321H compare to 321 in fabrication?​

321H is weldable with standard techniques but requires careful heat control to maintain its structure. It has good formability for bending and rolling, though slightly less ductile than 321 due to higher carbon, making it better for rigid, high-heat parts.​

 

What are 321H's typical applications?​

Commonly used in furnace parts, heat exchanger tubes, and aircraft exhaust systems. It's also found in chemical processing equipment that operates at elevated temperatures, where strength and corrosion resistance are both critical.