Hastelloy® X
Hastelloy X is a nickel-chromium-iron-molybdenum alloy that possesses an exceptional combination of oxidation resistance, fabricability, and high-temperature strength. It has also been found to be exceptionally resistant to stress-corrosion cracking in petrochemical applications.
- Common Forms: Sheet, Plate, Bar, Pipe, Forgings.
- Key Feature: Outstanding strength and oxidation resistance up to 2200°F (1200°C).
- Fabricability: Good ductility; easily formed and welded.
- Structure: Solid solution strengthened; non-magnetic.
Hastelloy X is the workhorse for hot-section gas turbine components. Unlike many high-strength superalloys which can be brittle or difficult to weld, Alloy X retains good ductility even after prolonged exposure to high temperatures (up to 16,000 hours). It resists oxidizing, reducing, and neutral atmospheres.
Oxidation Resistance
Excellent resistance to oxidation, carburization, and nitriding, making it ideal for furnaces and jet engine tailpipes.
High Temp Strength
Retains significant creep and rupture strength at temperatures where stainless steels would fail structurally (1600°F - 2200°F).
Ease of Fabrication
Known for its forming and welding characteristics. It can be forged and cold-worked, unlike many cast superalloys.
| Element | Content (%) |
|---|---|
| Nickel (Ni) | 47.0 min (Balance) |
| Chromium (Cr) | 20.5 - 23.0 |
| Iron (Fe) | 17.0 - 20.0 |
| Molybdenum (Mo) | 8.0 - 10.0 |
| Cobalt (Co) | 0.5 - 2.5 |
| Tungsten (W) | 0.2 - 1.0 |
| Carbon (C) | 0.05 - 0.15 |
*Note: The high Iron content is unique among Hastelloy grades, aiding fabricability.
| Product Form | ASTM / ASME Standards |
|---|---|
| Plate, Sheet, Strip | ASTM B435, ASME SB435 |
| Bar & Rod | ASTM B572, ASME SB572 |
| Pipe (Seamless) | ASTM B622, ASME SB622 |
| Pipe (Welded) | ASTM B619, ASME SB619 |
| Forgings | ASTM B564, ASME SB564 |
| Property | Typical Values (Room Temp) |
|---|---|
| Tensile Strength | 95 - 115 ksi (655 - 795 MPa) |
| Yield Strength (0.2% Offset) | 35 - 55 ksi (240 - 380 MPa) |
| Elongation | 35 - 50 % |
| Hardness (Rockwell B) | 85 - 95 HRB |
Gas Turbines
Transition ducts, combustion cans, spray bars, and flame holders.
Petrochemical Furnaces
Radiant tubes, muffles, retorts, and catalyst support grids.
Industrial Heating
Cabin heaters, flash drier components, and heat-treating fixtures.
Nuclear Engineering
Gas-cooled reactor components where resistance to corrosion and high heat is vital.
Need Hastelloy X for High Heat?
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