321 Stainless Steel Sheet
When it comes to high-temperature environments and resistance to intergranular corrosion, 321 stainless steel sheet is a standout choice. As a titanium-stabilized austenitic stainless steel, 321 offers excellent strength, corrosion resistance, and weldability — especially in applications where prolonged exposure to high heat is a concern.
321 stainless steel is a titanium-stabilized version of 304 stainless steel. It contains similar levels of chromium (17–19%) and nickel (9–12%) as 304, but with the addition of titanium (Ti). This titanium addition prevents carbide precipitation during welding and high-temperature exposure, which makes 321 particularly effective at resisting intergranular corrosion.
It is ideal for service in temperatures ranging from 427°C to 870°C (800°F to 1600°F).
Key Properties
| Property | Details |
|---|---|
| Corrosion Resistance | Excellent general and intergranular corrosion resistance, especially after welding. |
| Heat Resistance | Maintains strength and oxidation resistance at high temperatures. |
| Weldability | Excellent, especially for applications where post-weld annealing is not practical. |
| Creep Strength | Superior to 304 in high-temperature applications. |
| Formability | Good ductility and cold working capabilities. |
Chemical Composition
| Element | Content (%) |
|---|---|
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Carbon (C) | ≤ 0.08 |
| Manganese (Mn) | ≤ 2.00 |
| Silicon (Si) | ≤ 1.00 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.030 |
| Titanium (Ti) | ≥ 5x(C) to 0.70 |
| Iron (Fe) | Balance |
Advantages of 321 Stainless Steel Sheet
✅ Stabilized Against Intergranular Corrosion
The titanium content binds with carbon, preventing chromium carbide formation and ensuring long-term corrosion resistance after welding.
✅ High-Temperature Strength
Excellent performance in environments up to 870°C (1600°F), ideal for heat exchangers and exhaust components.
✅ No Need for Post-Weld Annealing
Unlike 304, 321 doesn’t require annealing after welding to maintain corrosion resistance, reducing time and cost in fabrication.
✅ Good Mechanical Properties
Offers strength and toughness across a wide range of temperatures.
✅ Durable in Oxidizing Environments
Maintains oxidation resistance under thermal cycling and aggressive atmospheric conditions.
Common Applications
321 stainless steel sheet is widely used in industries where both corrosion resistance and high-temperature strength are essential:
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Aircraft exhaust systems
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Thermal oxidizers and incinerators
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Petrochemical processing equipment
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High-temperature chemical tanks
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Furnace components and refractory anchors
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Automotive and aerospace heat shields
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Heat exchangers and boilers
321 vs 304 vs 316 Stainless Steel
| Property | 321 | 304 | 316 |
|---|---|---|---|
| Heat Resistance | Excellent (up to 870°C) | Moderate (up to 870°C short term) | Good (up to 870°C) |
| Intergranular Resistance | Excellent (due to Ti) | Moderate (needs annealing) | Good (Mo improves pitting resistance) |
| Corrosion Resistance | High | High | Higher (chloride-resistant) |
| Weldability | Excellent | Excellent | Excellent |
| Price | Slightly higher | Standard | Higher (Mo content) |
321 stainless steel sheet is a robust, heat-resistant, and corrosion-resistant material engineered for high-temperature service and demanding fabrication environments. Its titanium stabilization makes it ideal for welded structures and thermal equipment that must operate without compromising long-term durability or corrosion resistance.
If your project involves elevated temperatures, frequent thermal cycling, or welding-intensive construction, 321 stainless steel offers the optimal balance of strength, stability, and workability.
For more details please feel free to send your requirement to email: info@sino-unicorn.com. We will respond as soon as possible.