321 / 321H

UNS: S32100 / S32109 | W. Nr: 1.4541 / 1.4878 | EN: X6CrNiTi18-10 / X8CrNiTi18-10

321 and 321H stainless steel are titanium-stabilized austenitic stainless steels developed to provide improved resistance to intergranular corrosion after exposure to temperatures in the chromium carbide precipitation range (800–1500°F). These grades are ideal for high-temperature applications where welding is required.

Key Features

• High-Temperature Strength: Excellent performance in temperatures up to 900°C (1652°F).
• Intergranular Corrosion Resistance: Titanium stabilization prevents carbide precipitation.
• Weldability: Suitable for welding without post-weld annealing.
• Structural Integrity: Maintains mechanical properties under thermal cycling.

Industries and Applications

321 / 321H stainless steel is commonly used in:

• Aerospace: Jet engine components, exhaust systems
• Heat Treatment Equipment: Furnaces, radiant tubes
• Chemical Processing: High-temperature piping and tanks
• Automotive: Manifolds, turbocharger components
• Construction: Expansion joints, structural supports

Difference Between 321 and 321H

• 321H has a higher carbon content, offering enhanced creep resistance and strength at elevated temperatures.
• 321 is preferred for general high-temperature service, while 321H is ideal for pressure vessels and structural components exposed to sustained heat.

Available Forms

Available Shapes

AISI 321

AISI 321H