Hastelloy X (UNS N06002)
The combustion-zone alloy — oxidation resistant to 2200 °F with good creep strength — for gas-turbine, furnace and afterburner hardware.
What Hastelloy X is.
Hastelloy X is a nickel-chromium-iron-molybdenum alloy that combines oxidation resistance to about 2200 °F with useful strength and creep resistance to 1600 °F and excellent fabricability. It has been the standard sheet and hardware alloy for gas-turbine combustors, transition ducts and afterburners for decades, and it resists carburising and nitriding atmospheres in industrial furnaces.
ASTM B572 covers the rod. We machine Hastelloy X fasteners and components from certified B572 rod.
Chemical composition.
| Element | Symbol | Min % | Max % |
|---|---|---|---|
| Nickel | Ni | 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 |
| Silicon | Si | — | 1.00 |
| Manganese | Mn | — | 1.00 |
| Phosphorus | P | — | 0.04 |
| Sulfur | S | — | 0.03 |
Values per ASTM B572-06(2016) Table 2 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Mechanical properties.
| Condition and size | Tensile strength, min (ksi) | Yield strength 0.2%, min (ksi) | Elongation, min (%) |
|---|---|---|---|
| Solution annealed — rod 5/16 to 3½ in. | 95 | 35 | 35 |
Values per ASTM B572-06(2016) Table 3 (verified against the specification). Confirm the edition called out on your purchase order with our estimating team.
Specifications that apply.
How Hastelloy X ships from Houston.
- Full-thread studs and stud bolts
- Hex and heavy hex bolts
- Socket head cap screws
- Hex nuts in the same alloy
- Threaded rod
- Machined components from certified bar
Hastelloy X fasteners we make.
Every item is manufactured to your drawing or standard in Hastelloy X, imperial or metric, with an EN 10204 3.1 certificate.
What is Hastelloy X?
Alloy X is a solid-solution nickel alloy whose 22 percent chromium and 9 percent molybdenum give it a stable protective oxide and good hot strength without an ageing treatment, so it can be welded and formed freely and used to 2200 °F in oxidising atmospheres. It is not a corrosion alloy in the sense of C-276; its role is high-temperature structural and combustion hardware, where it is chosen over Inconel 600 for its higher strength and better resistance to hot-gas attack.
Testing, certification and marking
- Tensile and hardness tested per lot on the finished product
- Grade or alloy marking X with heat number and manufacturer's identification on every piece
- EN 10204 3.1 material test report with heat number and chemistry; 3.2 witness available
Inconel 718 (UNS N07718)
The premier high-strength nickel superalloy — 185 ksi tensile and 150 ksi yield from cryogenic temperatures to 1200 °F, with corrosion and sour-gas resistance to match.
ASTM B166 barInconel 600 (UNS N06600)
The general-purpose nickel-chromium alloy — oxidation resistant to 2000 °F, immune to chloride stress-corrosion cracking, for furnace, heat-treat and nuclear hardware.
ASTM B408 barIncoloy 800 / 800H / 800HT (UNS N08800 / N08810 / N08811)
The economical high-temperature alloy — 32 % nickel, 21 % chromium — for furnace, reformer and heat-exchanger hardware from 1000 to 1800 °F.