HASTELLOY® X – W. Nr. 2.4665 / UNS N06002 / ASTM B435, B572, B366
HASTELLOY® X
HASTELLOY® X is a nickel-chromium-iron-molybdenum alloy with excellent resistance to oxidation and high-temperature corrosion, combined with outstanding mechanical properties. Thanks to its high ductility and weldability, it is widely used in applications requiring resistance to stress-cracking and thermal fatigue, such as gas turbines, aerospace applications, and industrial furnaces.
This alloy is ideal for environments with oxidizing, reducing, and neutral atmospheres, offering superior performance compared to other heat-resistant alloys. It is particularly suitable for aircraft engine components, combustion chambers, heat exchangers, and structures for the chemical industry.
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Reference standards:
- ASTM B435 (sheets and strips)
- ASTM B572 (bars and wires)
- ASTM B366 (flanges and fittings)
- ASME SB-366, SB-435, SB-572, SB-619, SB-622, SB-626
- AMS 5536 (sheets), AMS 5754 (bars and forgings)
Chemical composition (%)
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 47.0 min |
| Chromium (Cr) | 22.0 |
| Iron (Fe) | 18.0 |
| Molybdenum (Mo) | 9.0 |
| Cobalt (Co) | 1.5 |
| Tungsten (W) | 0.6 |
| Carbon (C) | 0.10 max |
| Manganese (Mn) | 1.00 max |
| Silicon (Si) | 1.00 max |
| Boron (B) | 0.008 max |
| Niobium (Nb) | 0.5 max |
| Aluminum (Al) | 0.5 max |
| Titanium (Ti) | 0.15 max |
Mechanical properties
| Temperature (°C) | Tensile strength (MPa) | Yield strength (MPa) | Elongation (%) |
|---|---|---|---|
| 20 | 760 | 340 | 48 |
| 600 | 604 | 224 | 60 |
| 800 | 421 | 218 | 74 |
| 1000 | 255 | 189 | 98 |
| 1200 | 138 | 94 | 98 |
Heat treatments
- Solution annealing: 2150°F (1177°C) with rapid cooling in air or inert gas.
- Annealing: At temperatures below solution annealing may cause precipitation of secondary phases, with loss of ductility and mechanical strength.
- Hot forming: Working temperature between 1177°C and 982°C, followed by rapid cooling.
- Cold forming: Excellent workability, but requires solution annealing after high deformations.
Available forms
HASTELLOY® X is available in the following forms:
Industrial applications
Thanks to its high resistance to corrosion, oxidation, and high temperatures, HASTELLOY® X is used in the following sectors:
- Aerospace and Defense: Combustion chambers, nozzles, hot gas ducts.
- Power Generation: Gas turbines, high-temperature heat exchangers.
- Chemical and Pharmaceutical Industry: Furnaces, retorts, muffles, pyrolysis components.
- Motorsport: Exhaust systems for high temperatures.
- Nuclear: Structural components for nuclear plants.
- Oil & Gas: Piping for corrosive environments and high temperatures.
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