Alloy 321 Stainless Steel (UNS S32100)
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Stainless Steel - Grade 321 (ASTM A240/ ASTM A276/ ASTM A312)
Alloy 321 is a titanium-stabilized, austenitic stainless steel known for its excellent resistance to high-temperature oxidation and corrosion. It is designed to perform well in high-temperature applications where the risk of carbide precipitation is a concern, particularly in environments with moderate to high levels of sulfur and other corrosive elements.
Features of Alloy 321:
- Excellent High-Temperature Resistance: Good resistance to oxidation and corrosion at elevated temperatures (up to 900°C/1650°F).
- Prevention of Carbide Precipitation: Titanium stabilizes the alloy, preventing carbide formation and ensuring resistance to intergranular corrosion.
- Good Weldability: Excellent for welding in high-temperature applications without the risk of sensitization.
- Good Strength: Maintains mechanical properties at both room and elevated temperatures.
- Corrosion Resistance: Performs well in acidic environments such as sulfuric and phosphoric acids.
Specifications:
Applicable Standards:
- ASTM A240, ASTM A276, ASTM A312, UNS S32100
Mechanical Properties:
| Property | Value |
|---|---|
| Tensile Strength | ~505 MPa |
| Yield Strength | ~205 MPa |
| Elongation | ~40% |
| Hardness (BHN) | ~190 |
| Density | 7.93 g/cm³ |
Thermal Properties:
- Melting Range: 1400-1450°C
Chemical Composition:
| Element | Percentage (%) |
|---|---|
| Chromium (Cr) | 17.0-19.0 |
| Nickel (Ni) | 9.0-12.0 |
| Manganese (Mn) | 2.0 |
| Silicon (Si) | ≤1.0 |
| Carbon (C) | ≤0.08 |
| Titanium (Ti) | 5x(C) to 0.70% |
| Phosphorus (P) | ≤0.045 |
| Sulfur (S) | ≤0.030 |