Stainless Steel 321 is a titanium-stabilized austenitic alloy widely used for its exceptional heat resistance, durability, and corrosion protection. Known as an upgrade over SS 304, this grade performs reliably in high-temperature environments, making it a preferred choice for industries like aerospace, petrochemicals, and power generation. In this guide, we’ll explore the properties, composition, applications, and benefits of Stainless Steel 321, along with how it compares to other popular grades.
Stainless Steel 321 is an austenitic stainless steel alloy stabilized with titanium. This stabilization helps prevent carbide precipitation during welding, making it more resistant to intergranular corrosion.
It is widely recognized as a high-temperature material that offers excellent strength, durability, and resistance to oxidation, especially in environments where exposure goes beyond 800°C.
In simple terms, SS 321 is like stainless steel 304, but with added titanium for better heat resistance and weldability.
| Element | Percentage (%) |
|---|---|
| Carbon (C) | ≤ 0.08 |
| Chromium (Cr) | 17.0 – 19.0 |
| Nickel (Ni) | 9.0 – 12.0 |
| Titanium (Ti) | ≥ 5 × C% (min 0.7%) |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.03 |
| Iron (Fe) | Balance |
| Property | Value |
|---|---|
| Density | 8.0 g/cm³ |
| Melting Point | 1398–1454 °C |
| Tensile Strength | 515 MPa (min) |
| Yield Strength | 205 MPa (min) |
| Elongation | 40% (min) |
| Hardness | 217 HB (max) |
| Feature | SS 321 | SS 316 |
|---|---|---|
| Stabilizer | Titanium | Molybdenum |
| Heat Resistance | Excellent (up to 870°C) | Moderate (up to 600°C) |
| Corrosion Resistance | Good | Excellent in chlorides & acids |
| Weldability | High | High |
| Applications | Heat exchangers, aerospace, furnaces | Marine, chemical plants, pharma |
Stainless Steel 321 is widely used in industries such as:
Its ability to maintain strength even at 870°C makes it unique among stainless steel grades.
Stainless Steel 321 stands out as a heat-resistant, corrosion-resistant, and durable alloy suitable for demanding industrial environments. Whether you’re in aerospace, petrochemical, or power generation, SS 321 ensures performance and reliability.
At Riyaarth Overseas, we supply premium-quality Stainless Steel 321 sheets, plates, pipes, and fittings that meet global standards. Get in touch with us today to source materials that match your exact requirements.
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