NI · superalloy
Nickel Alloy Hastelloy X (UNS N06002)
A nickel-chromium-iron-molybdenum alloy for high-temperature structural service. Machines like a hard stainless - slow and work-hardening, but not the punishment that 718 or C-276 deliver.
Quoting this material
- Typical lead time
- 20–35 working days
- Condition
- Annealed
- Achievable finish
- Ra 1.6 µm typical · Ra 0.8 µm best
Machined in-house to your drawing: see the precision CNC machining service and the machine and inspection capability it runs on.
Machinability
Our own 1–10 shop ranking, not a published index: 10 is free-cutting brass C360, 1 is Inconel 718. It ranks how a material behaves on the floor - cycle time, chip control and tool life together. Where a published index exists it is quoted in the note.
A nickel-chromium-iron-molybdenum alloy for high-temperature structural service. Machines like a hard stainless - slow and work-hardening, but not the punishment that 718 or C-276 deliver.
Properties as supplied
| Parameter | Value | Unit |
|---|---|---|
| Tensile strength | 760 | MPa |
| Yield strength (0.2%) | 350 | MPa |
| Elongation | 40 | % |
| Hardness | ~180 | HB |
| Service temperature | To 1,000 | °C |
| Thermal conductivity | 12.2 | W/m·K |
Hardness, tensile and thermal figures are typical published values for the condition stated. Actual mill certificates govern; send the specification with the drawing and we confirm against the certificate before the material is cut.
Condition
Annealed
Heat treatment
Solid-solution strengthened; no ageing treatment. It holds useful strength to about 1,000 °C with good oxidation resistance, which is the pair of properties being bought.
Achievable surface finish
Ra 1.6 µm
Ra 0.8 µm
Takes a clean finish with sharp tooling; the sheet and plate forms are usually the ones machined at the edges.
Tooling and cutting parameters
Cutting speed
- 25–50 m/min (carbide)
Feed
- 0.06–0.18 mm/rev turning · 0.05–0.12 mm/tooth milling
Tooling
- Fine-grain carbide, sharp positive geometry
Coolant
- High-pressure flood
Starting points for carbide on a rigid setup, not a guarantee. The right numbers depend on the machine, the toolholder and the fixturing - ask and we will say what we would actually run.
Typical applications
- Gas turbine combustion chambers
- Aircraft exhaust components
- Industrial furnace hardware
- Heat treatment baskets and fixtures
- Nuclear high-temperature components
DFM notes for this grade
- Usually supplied as sheet or plate for formed and welded assemblies, which is why the machining is often limited to edge trimming, bolt holes and flanges
- Excellent forming and welding for a nickel alloy: it is chosen for the fabrication, not for a high-stress machined monolith
- Not a high-strength alloy: 760 MPa puts it below Inconel 625, and it is bought for temperature and oxidation rather than load
Questions buyers ask
- Where is Hastelloy X used rather than 625?
- Sustained temperature above about 800 °C with oxidation. Combustion chambers and furnace hardware live there; 625 is a stronger alloy but has a lower useful temperature limit for continuous service.
- Is it available in bar for machined parts?
- Yes, but most of it goes out as sheet and plate because the applications are fabrications. A machined Hastelloy X part usually means a flange, a transition piece or a fixture component rather than a structural component.
Grades we would quote instead
Inconel 600
2/10The mildest of the common nickel alloys to machine - still awkward, but it work-hardens less aggressively than 625 and far less than 718.
Inconel 625
2/10Harder to machine than the 600-series grades and easier than 718.
Inconel 718
1/10The bottom of our scale and the reason the scale exists.