Alloy 321
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Alloy 321 - Austenitic Stainless Steel
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 |