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Description
Chemical Composition and Mechanical Properties of Austenitic 321H (S32109) Stainless Steel
Chemical Composition:
| Element | Percentage |
|---|---|
| Carbon | 0.04-0.10 |
| Manganese (max) | 2.00 |
| Silicon (max) | 0.75 |
| Chromium | 17.00-19.00 |
| Nickel | 9.00-12.00 |
| Titanium | 5x(C+N) min, 0.70 max |
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength (min) | 75 ksi (515 MPa) |
| Yield Strength (min) | 30 ksi (205 MPa) |
| Elongation (min) | 40% |
| Hardness (max) | 217 Brinell, 95 Rockwell B |
Applications and Industries Using 321H Stainless Steel Plates and Coils
321H stainless steel is commonly used in:
- Aerospace: Aircraft exhaust systems and engine parts
- Chemical processing: Heat exchangers, pressure vessels, and storage tanks
- Thermal equipment: Boilers, furnace parts, and industrial heat-treating equipment
- Petroleum and refining: Piping and refining equipment
- Power generation: Components exposed to high temperatures
- 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:
| Dimension | Range |
|---|---|
| Thickness | 6 – 100 mm |
| Width | Up to 3500 mm |
| Length | Up to 12000 mm |
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.
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