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Stainless Steel 321 Plates
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Stainless steel 321 plates are titanium-stabilized austenitic stainless steel plates designed for high-temperature service and welded structures. They offer excellent resistance to intergranular corrosion and are widely used in thermal and industrial environments.
What is Stainless Steel 321 Plate?
321 stainless steel (UNS S32100) is an austenitic stainless steel similar to 304, but stabilized with titanium (Ti). The titanium binds with carbon, preventing chromium carbide formation during heating and welding.
Key characteristics:
- Austenitic structure (non-magnetic in annealed condition)
- Titanium-stabilized for high-temperature performance
- Excellent resistance to intergranular corrosion
- Good weldability and thermal stability
Chemical Composition of 321 Stainless Steel
| Element | Composition (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C (stabilizing element) |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
Key insight:
Titanium stabilization prevents carbide precipitation, improving corrosion resistance in welded and high-temperature conditions.
Mechanical and Performance Properties
| Property | Value |
|---|---|
| Tensile Strength | ≥ 515 MPa |
| Yield Strength | ≥ 205 MPa |
| Elongation | ≥ 40% |
| Density | ~8.0 g/cm³ |
| Service Temperature | Up to ~870–900°C (continuous use) |
Key Performance Features of 321 Stainless Steel
Excellent High-Temperature Resistance
Performs well under continuous thermal exposure and cyclic heating conditions.
Strong Resistance to Intergranular Corrosion
Titanium stabilization prevents sensitization after welding.
Good Weldability
Can be welded without post-weld heat treatment in most cases.
Stable Mechanical Performance
Maintains strength and structural integrity at elevated temperatures.
321 vs 320 Stainless Steel – Key Comparison
Note: 320 stainless steel is less commonly used in industrial markets compared to 321.
Chemical and Structural Differences
| Property | 321 Stainless Steel | 320 Stainless Steel |
|---|---|---|
| Stabilizing Element | Titanium (Ti) | No standard titanium stabilization |
| Carbon Control | Controlled low carbon | Variable depending on grade source |
| Corrosion Resistance | High (especially welded condition) | Generally lower consistency |
| High-Temperature Stability | Excellent | Limited or inconsistent |
Performance Comparison
| Property | 321 | 320 |
|---|---|---|
| Weldability | Excellent | Unstable / less predictable |
| Intergranular Corrosion Resistance | Strong | Weaker |
| High-Temperature Service | Reliable | Limited use |
| Industrial Usage | Widely used | Rare / niche applications |
Key insight:
321 is a well-established industrial grade, while 320 is not commonly standardized in most global stainless steel systems.
Common Applications of 321 Stainless Steel Plates
- Aircraft exhaust systems
- Heat exchangers
- Boiler and pressure systems
- Furnace components
- High-temperature piping systems
- Petrochemical equipment
- Industrial thermal processing equipment
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