Alloy X / HX – Properties, Applications and Technical Data
Alloy X is a solid solution hardened nickel-based superalloy developed for high strength and very good oxidation resistance in high temperature environments. The material is widely used in gas turbines, industrial furnaces and heat treatment equipment where long-term thermal stability and mechanical integrity are essential.
Alloy X Properties
Alloy X has an austenitic structure and maintains good mechanical properties over a wide temperature range. The alloy is known for its combination of oxidation resistance, good formability and good weldability compared to many other nickel-based materials.
- Type: Solid solution hardened nickel-based superalloy
- Alloy: Ni-Cr-Fe-Mo (Alloy X)
- Structure: Austenitic nickel-based alloy
- Alternative designations: Alloy HX, Hastelloy® X, INCONEL® HX
- UNS: N06002
- Werkstoffnr: 2.4665
- Standards: ASTM B435, ASTM B572, AMS 5536, AMS 5754
Advantages
- Very good oxidation resistance at high temperatures
- Good creep strength and structural stability under long-term thermal stress
- Good weldability
- Good formability in solution treated condition
- Suitable for demanding furnace and turbine components
Limitations
- Higher material cost than standard stainless steels
- Not optimized for very high sulfur environments at high temperatures
- Choice of process and heat treatment affects final properties
Typical applications
Gas turbines
Combustion chambers, transition pieces and components in hot gas zones.
Industrial furnaces
Furnace parts, fixtures, burner tubes and parts in heat treatment equipment.
Energy & Power generation
Components where combined temperature strength and oxidation resistance are required.
Chemical process industry
Equipment in environments where temperature and corrosion stress the material.
Corrosion and oxidation resistance
Alloy X offers good resistance to oxidation and hot gas corrosion at elevated temperatures. The material is particularly suitable for oxidizing atmospheres and is often used where standard stainless materials are not sufficient for high-temperature operation.
Environments where Alloy X performs well
- Oxidizing high-temperature environments
- Furnaces and heat treatment processes
- Thermal loading during long operating times
- Hot gas zones in turbine systems
Environments to avoid
- Highly sulfur-rich environments at high temperatures
- Applications where simpler materials provide sufficient performance (cost aspect)
Technical data (annealed condition)
| Yield strength 0.2% |
~240–380 MPa |
| Tensile strength |
~655–790 MPa |
| Elongation at break |
~35–45% |
| Density |
~8.22 g/cm³ |
| Modulus of elasticity |
~205 GPa |
| Recommended maximum temperature |
≤1100°C |
| Weldability |
Good – correct method selection and (if necessary) heat treatment is recommended |
With a global network of reliable suppliers, we offer customized solutions and fast access to the right nickel-based superalloy for your needs.
Contact us if you need technical advice or want a quote – we will help you find the right material for your application.
Buy Alloy X / HX from HARALD PIHL – your specialist in high-temperature materials with global delivery.
Our strengths
- Large stock of nickel-based superalloys
- Fast global delivery from Europe
- Full material certification according to EN 10204 3.1
- Material according to ASTM, AMS and ISO standards
- Cutting and fitting according to drawing