Alloy 20 INCOLOY® 20 – UNS N08020 / ASTM B462, B463, B729
Alloy 20 INCOLOY® 20
Alloy 20 INCOLOY® 20 is a nickel-iron-chromium based alloy with additions of molybdenum, copper and niobium, designed to offer excellent corrosion resistance in aggressive chemical environments, particularly in the presence of sulfuric acid. The alloy is also resistant to chloride corrosion, nitric acid and phosphoric acid.
Thanks to its resistance to stress corrosion cracking and crevice corrosion, INCOLOY® 20 is ideal for applications requiring high performance in acidic environments. The alloy is easily machinable and weldable, and is commonly used for the production of heat exchangers, process piping, tanks, valves and fittings.
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Reference standards:
- ASTM B462 (bars and forgings)
- ASTM B463 (sheets and strips)
- ASTM B729 (seamless tubes)
- ASME SB-462, SB-463, SB-729
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 32.0 – 38.0 |
| Chromium (Cr) | 19.0 – 21.0 |
| Copper (Cu) | 3.0 – 4.0 |
| Molybdenum (Mo) | 2.0 – 3.0 |
| Iron (Fe) | Balance |
| Carbon (C) | 0.07 max |
| Niobium + Tantalum (Nb + Ta) | 8 x C – 1.0 |
| Manganese (Mn) | 2.0 max |
| Phosphorus (P) | 0.045 max |
| Sulfur (S) | 0.035 max |
| Silicon (Si) | 1.0 max |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 620 | 300 | 40 |
Heat treatments
- Annealing: 1800-1850°F (982-1010°C) with air cooling to maintain corrosion resistance.
- Hot forming: Temperature between 760 and 1175°C.
- Stress relieving: To reduce internal stresses, recommended after cold working.
Available forms
INCOLOY® Alloy 20 is available in the following forms:
Industrial applications
Thanks to its excellent corrosion resistance, INCOLOY® 20 is widely used in the following sectors:
- Aerospace and Defence: Components exposed to aggressive chemical environments.
- Power Generation: Piping and heat exchangers.
- Chemical and Pharmaceutical Industry: Storage tanks, aggressive acid transport systems, pumps and valves.
- Motorsport: Corrosion-resistant exhaust systems.
- Nuclear: Structural components for radioactive environments.
- Oil & Gas: Subsea piping, fittings and valves for corrosive and high-pressure environments.
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