Chemical Composition and Mechanical Properties of Austenitic 321H (S32109) Stainless Steel

Chemical Composition:

Mechanical Properties:

Applications and Industries Using 321H Stainless Steel Plates and Coils

321H stainless steel is commonly used in:

1. Aerospace: Aircraft exhaust systems and engine parts
2. Chemical processing: Heat exchangers, pressure vessels, and storage tanks
3. Thermal equipment: Boilers, furnace parts, and industrial heat-treating equipment
4. Petroleum and refining: Piping and refining equipment
5. Power generation: Components exposed to high temperatures
6. Food processing: Equipment and storage units

High-Temperature Performance and Corrosion Resistance

321H stainless steel offers:

• Excellent resistance to oxidation up to 1500°F (816°C)
• Higher creep and stress rupture properties than 304 and 304L alloys
• Good low-temperature toughness
• Excellent resistance to intergranular corrosion after exposure to temperatures in the range of 800-1500°F (427-816°C)

Manufacturing Process and Available Dimensions

Manufacturing Process: Hot rolled or cold rolled, followed by annealing at 1800-2000°F

Available Dimensions:

Welding and Fabrication Considerations

321H stainless steel can be easily welded using standard fusion and resistance welding processes. No preheating is required, and post-weld annealing is generally unnecessary.

Comparison of 321H with Other Austenitic Stainless Steel Grades

321H offers higher carbon content (0.04-0.10%) compared to regular 321 grade, providing enhanced creep resistance and higher strength at temperatures above 1000°F (537°C). It maintains better mechanical properties at elevated temperatures compared to 304 and 304L grades.

At HL Steel Company, we provide high-quality Austenitic 321H (S32109) stainless steel plates and coils, ensuring optimal performance and cost-effectiveness for your industrial applications.