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ALLOY X UNS N06002 is a solid-solution strengthened wrought nickel-base super alloy within the Ni-Cr-Fe-Mo system. It delivers exceptional high-temperature oxidation resistance, creep resistance and stress rupture properties up to 1200°C, along with great stress-corrosion cracking resistance, forgeability and overall workability. This material is widely used for high-temperature structural parts, gas turbine hot-end components, industrial furnace units and petrochemical equipment operating under extreme thermal and mechanical loads. It is also known as Hastelloy X, Inconel HX, DIN 2.4665, and complies with ASTM B435, B572, B619, B622, AMS 5587, AMS 5754 and other international standards.
1. Key Features
- Excellent creep resistance and stress rupture strength at 650°C ~ 1150°C, ideal for long-term operation under high temperature and heavy load
- Superior static and dynamic oxidation resistance at high temperatures, as well as remarkable carburization resistance
- Good aqueous corrosion resistance and stress-corrosion cracking resistance at ambient temperature
- Excellent performance in hot forging, cold forming, machining and welding
- Stable physical and mechanical properties over a wide temperature range with low thermal deformation
2. Chemical Composition
The chemical composition of ALLOY X UNS N06002 alloy is outlined in the following table.
| Element | Content (%) |
| Cr,Chromium | 20.5-23 |
| Fe,Iron | 17-20 |
| Mo,Molybdenum | 8-10 |
| Mn,Manganese | 1 max |
| Si,Silicon | 1 max |
| Ti,Titanium | 0.15 max |
| Co,Cobalt | 0.5-2.5 |
| Al,Aluminum | 0.5 max |
| Cu,Copper | 0.5 max |
| C,Carbon | 0.05-0.15 |
| P,Phosphorus | 0.04 max |
| S,Sulfur | 0.03 max |
| W,Tungsten | 0.2-1 |
| B,Boron | 0.008 max |
| Ni,Nickel | Remainder |
Chromium enhances oxidation and carburization resistance; molybdenum and tungsten improve high-temperature creep performance; nickel further boosts resistance to carburization, nitridation and chloride corrosion. The synergistic effect of multiple elements achieves comprehensive performance optimization.
3. Physical Properties
| Properties | Metric | Imperial |
| Density | 8.220 g/cm3 | 0.297 lb/in3 |
| Melting point | 1316°C | 2400°F |
4. Mechanical Properties
| Properties | Metric | Imperial |
| Tensile strength | 755 MPa | 109.5 Ksi |
| Yield strength | 385 MPa | 55.9 Ksi |
| Elastic modulus | 205 GPa | 29.8 Mpsi |
| Reduction of area | 22% | 22% |
| Hardness,Rockwell B (converted from Brinell hardness) | 87 | 87 |
5. Thermal Properties
| Properties | Metric | Imperial |
| Thermal expansion coefficient | 13.0 μm/(m・°C) | 7.2 μin/in°F |
| Thermal conductivity | 9.1 W/(m・K) | 63 BTU・in/(hr・ft²・°F) |
4. Heat Treatment & Processing
ALLOY X UNS N06002 cannot be hardened by conventional quenching. Only solution annealing is adopted to optimize its performance; aging treatment is not applicable and may be harmful.
Solution Annealing
- Standard temperature: 1175°C (recommended range: 1149–1204°C)
- Holding time: 15~30 minutes for batch annealing; 1 hour for continuous annealing
- Cooling: Forced air cooling or water quenching
- Purpose: Fully dissolve carbides to form uniform single-phase solid solution, maximizing ductility, weldability and overall high-temperature performance. This is the standard delivery condition.
Hot Forging
- Recommended forging temperature: 1095°C
- The alloy features excellent forgeability and resists cracking during hot working.
Cold Working
Cold forming is available. Higher forming pressure is required due to its high rigidity. Solution annealing is recommended after cold working to restore ductility.
Welding
Applicable processes include SMAW, GTAW, GMAW and resistance welding. ERNiCrMo-2 is used as matching filler metal. Preheating and post-heating are not required, and the alloy presents good weldability without embrittlement.
Machining & Forming
Conventional tools and equipment are applicable. The annealed material has stable machinability to meet precision processing requirements.
5. Applications
- Aerospace: Jet engine tailpipes, afterburners, turbine blades, vanes and other gas turbine hot-end components
- Industrial Furnace: High-temperature structural frames, radiant tubes, furnace linings and heat treatment fixtures
- Petrochemical: High-temperature reaction vessels, process piping and fluid control parts under corrosive and high-temperature conditions
- Power Generation: Gas turbine combustor components and high-temperature flue gas system parts
6. Why Choose C&N for ALLOY X UNS N06002
All our ALLOY X UNS N06002 products are manufactured in strict accordance with international standards. C&N implement rigorous raw material inspection and standardized heat treatment to ensure stable and consistent material performance. With complete specifications and custom service , our products feature excellent workability and long service life. Professional technical assistance is also available to satisfy your one-stop procurement demands.Please contact us immediately for any inquiries or requirements.
