Designated as UNS N08020, Alloy 20 (also known as “Incoloy 020” or “Incoloy 20”) is a nickel-iron-chromium alloy with additions of copper and molybdenum. It has exceptional corrosion resistance to sulfuric acid, choloride stress-corrosion cracking, nitric acid, and phosphoric acid. Alloy 20 can be readily hot-formed or cold-formed to valves, pipe fittings, flanges, fasteners, pumps, tanks, as well as heat exchanger components. The hot forming temperature should be in the range of 1400-2150°F [760-1175°C]. Usually, the heat treatment of annealing should be conducted at the temperature range of 1800-1850°F [982-1010°C]. Alloy 20 is widely used for the production of gasoline, organic & inorganic chemicals, pharmaceutical processing, and food industry.
1. Chemical Composition Requirements
| The Chemical Composition of Alloy 20, % | |
|---|---|
| Nickel | 32.0-38.0 |
| Chromiun | 19.0-21.0 |
| Copper | 3.0-4.0 |
| Molybdenum | 2.0-3.0 |
| Iron | Balance |
| Carbon | ≤0.07 |
| Niobium+tantalum | 8*C-1.0 |
| Managanese | ≤2.00 |
| Phosphorus | ≤0.045 |
| Sulfur | ≤0.035 |
| Silicon | ≤1.00 |
2. Mechanical Properties of Alloy 20
ASTM B462 Alloy 20 (UNS N08020) forged fittings and forged flanges.
| Tensile Strength, min. | Yield Strength, min. | Elongation, min. | Young’s Modulus | |||
|---|---|---|---|---|---|---|
| Mpa | ksi | Mpa | ksi | % | 103ksi | Gpa |
| 620 | 90 | 300 | 45 | 40 | 28 | 193 |
3. Physical Properties of Alloy 20
| Density | Specific Heat | Electrical Resistivity | Thermal Conductivity |
|---|---|---|---|
| g/cm3 | J/kg.°C | µΩ·m | W/m.°C |
| 8.08 | 500 | 1.08 | 12.3 |
4. Product Forms and Standards
| Product Form | Standard |
|---|---|
| Rod, bar and wire | ASTM B473, B472, B462 |
| Plate, sheet and strip | ASTM A240, A480, B463, B906 |
| Seamless pipe and tube | ASTM B729, B829 |
| Welded pipe | ASTM B464, B775 |
| Welded tube | ASTM B468, B751 |
| Welded fittings | ASTM B366 |
| Forged flanges and forged fittings | ASTM B462, B472 |
Post time: Oct-23-2020