Nickel Alloy UNS N06002 Hastelloy X
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Hastelloy X is a nickel-chromium-iron-molybdenum superalloy with outstanding high temperature strength, oxidation resistance, and fabricability. Alloy X's oxidation resistance is excellent up to 2200° F. This nickel steels alloy has also been found to be exceptionally resistant to stress-corrosion cracking in petrochemical applications. Matrix stiffening provided by the molybdenum content results in high strength in a solid-solution alloy having good fabrication characteristics.
Hastelloy X Chemical Composition
| % | Cr | Mo | Co | W | Al | Ti | B | C | Fe | Mn | Si | P | S | Cu | Ni |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | 20.5 | 8 | 0.5 | 0.2 | - | - | - | 0.05 | 17 | - | - | - | - | - | - |
| Max | 23 | 10 | 2.5 | 1 | 0.5 | 0.15 | 0.01 | 0.15 | 20 | 1 | 1 | 0.04 | 0.03 | 0.5 | Balance |
Alloy X Physical Properties
| Density | Melting range |
|---|---|
| 8.221 g/cm³ | 1260-1354°C |
Mechanical Properties
| Cold worked % |
Yield strength |
Ultimate tensile strength |
Elongation |
| 0 | 427 MPa [62 ksi] | 827 MPa [120 ksi] | 38 |
| 20 | 1014 MPa [147 ksi] | 1165 MPa [169 ksi] | 5.8 |
| 37 | 1131 MPa [164 ksi] | 1303 MPa [189 ksi] | 3.9 |
|
50 |
1379 MPa [200 ksi] | 1558 MPa [226 ksi] | 3.1 |
|
60 |
1310 MPa [210 ksi] | 1627 MPa [230 ksi] | 2.4 |

Nickel Alloy Hastelloy X Features
- High degree of oxidation resistance up to 2200° F
- Outstanding high-temperature strength
- Easily fabricated including forming and welding
- Good ductility after prolonged exposure at high-temperatures
- Good resistance to chloride stress-corrosion cracking
- Resistant to carburization and nitriding
- Develops a protective oxide film that does not spall off
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