Alloy 20
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Alloy 20 - Corrosion-Resistant Nickel-Iron-Chromium Alloy
Alloy 20 is a corrosion-resistant, nickel-based superalloy that is primarily composed of nickel, iron, chromium, and molybdenum. It was specifically designed to resist sulfuric acid and other highly corrosive environments. This alloy is renowned for its excellent resistance to a wide range of corrosive media, including acidic environments like sulfuric acid, phosphoric acid, and nitric acid, making it ideal for applications in chemical processing and other industries requiring superior corrosion resistance.
Alloy 20 is commonly used in industries such as chemicals, pharmaceuticals, and food processing. Its excellent mechanical properties, good weldability, and resistance to oxidation make it one of the preferred materials for manufacturing equipment and components that must endure harsh environments.
Features of Alloy 20:
- Excellent Corrosion Resistance: Particularly resistant to sulfuric acid, making it ideal for handling highly corrosive materials in chemical plants.
- High Strength: Alloy 20 has good tensile strength, which helps maintain the integrity of parts in industrial applications.
- Good Weldability: The alloy can be welded using standard techniques with minimal risk of cracking, ensuring versatility in fabrication.
- Resistant to Pitting and Crevice Corrosion: The presence of molybdenum and chromium provides excellent resistance to pitting and crevice corrosion in chloride environments.
- Good Oxidation Resistance: Alloy 20 performs well in environments where oxidation resistance is required, especially at elevated temperatures.
- Non-Sensitizing: This alloy does not suffer from sensitization (the formation of chromium carbides) when exposed to high temperatures, making it resistant to intergranular corrosion.
Specifications:
- ASTM B463
- ASTM B464
- UNS N08020
- EN 1.4529
These specifications indicate that Alloy 20 is suitable for a wide range of applications in industries such as chemical processing, pharmaceuticals, food processing, and others requiring corrosion-resistant materials.
Composition of Alloy 20:
Element | Percentage |
---|---|
Nickel (Ni) | 32.0-38.0% |
Iron (Fe) | Balance |
Chromium (Cr) | 19.0-21.0% |
Molybdenum (Mo) | 2.0-3.0% |
Copper (Cu) | 3.0-4.0% |
Carbon (C) | 0.07% Max |
Manganese (Mn) | 2.0% Max |
Silicon (Si) | 1.0% Max |
Sulfur (S) | 0.03% Max |
Phosphorus (P) | 0.04% Max |
Physical Properties:
Property | Value |
---|---|
Density | 8.0 g/cm³ |
Melting Point | 1375-1400°C (2500-2550°F) |
Hardness (BHN) | 200-250 BHN |
Tensile Strength | 520 MPa (75,000 psi) |
Yield Strength | 205 MPa (30,000 psi) |
Elongation | 40% |
Modulus of Elasticity | 200 GPa |
Thermal Conductivity | 14.9 W/m·K |
Coefficient of Thermal Expansion | 16.0 x 10^-6 /°C |