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Alloy 20 (UNS N08020) is a nickel-iron-chromium-based austenitic alloy known for its superior resistance to corrosion, especially in sulfuric acid environments. This alloy offers significant protection against pitting and crevice corrosion while exhibiting immunity to chloride stress corrosion cracking. Designed for high-resistance applications, Alloy 20 is ideal for various chemical, petrochemical, and marine environments, often performing better than standard stainless steels like 316L.
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| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 32.0 – 38.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Copper (Cu) | 3.0 – 4.0 |
| Niobium (Nb) + Tantalum (Ta) | 8 x C – 1.0 |
| Manganese (Mn) | ≤ 2.0 |
| Silicon (Si) | ≤ 1.0 |
| Carbon (C) | ≤ 0.07 |
| Phosphorus (P) | ≤ 0.045 |
| Sulfur (S) | ≤ 0.035 |
| Iron (Fe) | Balance |
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Density | 8.08 g/cm³ | 0.292 lb/in³ |
| Modulus of Elasticity | 195 GPa | 28,300 ksi |
| Coefficient of Thermal Expansion | 13.9 µm/m·°C | 7.72 µin/in·°F |
| Thermal Conductivity | 10.3 W/m·K | 71.5 BTU·in/hr·ft²·°F |
| Melting Range | 1357 – 1439°C | 2475 – 2625°F |
| Property | Value (Metric) | Value (Imperial) |
|---|---|---|
| Yield Strength (0.2% Offset) | 241 MPa | 35,000 psi |
| Ultimate Tensile Strength | 586 MPa | 85,000 psi |
| Elongation at Break | 30% | – |
| Hardness (Brinell) | ≤ 217 | – |
| Property | Metric | Imperial |
|---|---|---|
| Thermal Conductivity | 10.3 W/m·K | 71.5 BTU·in/hr·ft²·°F |
| Mean Coefficient of Thermal Expansion | 13.9 µm/m·°C | 7.72 µin/in·°F |
| Specific Heat Capacity | 500 J/kg·K | 0.12 BTU/lb·°F |
| Property | Value |
|---|---|
| Electrical Resistivity | 0.85 µΩ·m |
| Product Type | Standards | Sizes | Types | Applications |
|---|---|---|---|---|
| Sheets & Plates | ASTM B463 | Thickness: 3mm – 100mm | Hot Rolled, Cold Rolled | Chemical storage, processing tanks |
| Pipes & Tubes | ASTM B729, B464, B468 | Diameter: 6mm – 500mm | Seamless, Welded | Corrosive piping, marine structures |
| Bars | ASTM B473 | Diameter: 6mm – 200mm | Round, Square, Hex | Valve parts, fasteners, pump components |
| Angles, Channels, Beams | ASTM B463 | Custom sizes available | L-Angles, U-Channels | Structural supports, marine equipment |
| Fittings | ASTM B366 | Size: 1/2″ – 36″ | Buttweld, Socket Weld | Corrosive environments, chemical processing |
Alloy 20 is a preferred material in industries requiring high corrosion resistance and durability, especially in environments where sulfuric acid and chlorides are present:
When compared to 316L stainless steel, Alloy 20 exhibits significantly enhanced resistance to sulfuric acid, pitting, and crevice corrosion. It also surpasses standard austenitic steels in chloride stress corrosion cracking resistance, making it suitable for more aggressive environments without requiring costly nickel alloys.
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