Alloy X (UNS N06002)
Solid-solution nickel–chromium–iron–molybdenum alloy with an exceptional record in combustor and furnace hardware.
- UNS
- N06002
- W.Nr / EN
- 2.4665
- Density
- 8.22 g/cm³
- Service range
- To ~1200 °C (oxidation)
About Alloy X
Alloy X is a solid-solution-strengthened superalloy whose balanced nickel–chromium–iron–molybdenum chemistry delivers an unusual mix: high creep strength to about 870 °C, oxidation resistance to roughly 1200 °C, and the forming and welding behaviour of a conventional sheet alloy.
Decades of service in combustion-zone components have made it a default choice for flame tubes, transition ducts and afterburner hardware, as well as industrial-furnace internals. DMK Alloys manufactures Alloy X blanks, bars and fabrication-ready components.
Alloy X chemical composition (weight %)
| Element | Limit / range |
|---|---|
| Ni | Balance |
| Cr | 20.5 – 23.0 |
| Fe | 17.0 – 20.0 |
| Mo | 8.0 – 10.0 |
| Co | 0.5 – 2.5 |
| W | 0.2 – 1.0 |
| C | 0.05 – 0.15 |
| Mn | ≤ 1.0 |
| Si | ≤ 1.0 |
| B | ≤ 0.008 |
Composition limits per the commonly referenced standards listed below. Order-specific limits may differ — confirm against the governing specification.
Alloy X mechanical properties (typical)
| Condition / form | Tensile, MPa | 0.2% Yield, MPa | Elongation, % |
|---|---|---|---|
| Sheet, solution annealed, room temp. | ≥ 690 | ≥ 275 | ≥ 35 |
| Bar, solution annealed, room temp. | ≈ 755 | ≈ 385 | ≈ 45 |
Values are typical or specification-minimum levels for guidance only — not a guarantee of properties. Certified values are established by testing against the ordered specification.
Alloy X specifications & international equivalents
| System | Designation | Covers |
|---|---|---|
| UNS | N06002 | All product forms |
| AMS | AMS 5536 | Sheet, strip, plate |
| AMS | AMS 5754 | Bars, forgings |
| ASTM | ASTM B435 | Sheet, plate |
| ASTM | ASTM B572 | Rod, bar |
| W.Nr / EN | 2.4665 · NiCr22Fe18Mo | European cross-reference |
Cross-references are for guidance; the governing document is always the specification cited on your purchase order or drawing.
Alloy X physical properties
| Property | Typical value |
|---|---|
| Density | 8.22 g/cm³ |
| Melting range | 1260 – 1355 °C |
| Modulus of elasticity (family-typical) | ≈ 200 – 220 GPa |
| Indicative service range | To ~1200 °C (oxidation) |
Forms we manufacture
- Sheet and plate blanks
- Bars
- Forged blanks
- Components to drawing
Dimensional ranges and delivery conditions are confirmed per enquiry.
Where Alloy X earns its keep
Typically specified for:
- Combustor flame tubes
- Transition ducts
- Afterburner components
- Industrial-furnace hardware
Also consider
Alloy 625
UNS N06625 · W.Nr 2.4856AMS 5666 · AMS 5599
Solid-solution nickel–chromium–molybdenum–niobium alloy with outstanding corrosion resistance and strength without age hardening.
Alloy 601
UNS N06601 · W.Nr 2.4851AMS 5870 · ASTM B166
Aluminium-bearing nickel–chromium alloy with exceptional resistance to oxidation and spalling in cyclic high-temperature service.
Alloy 263
UNS N07263 · W.Nr 2.4650AMS 5872 · AMS 5886
Age-hardenable nickel–cobalt–chromium–molybdenum sheet alloy prized for fabricability in hot-gas-path structures.
Request Alloy X to your specification
State the governing standard, form, dimensions, quantity and testing requirements — the export team responds with a manufacturer's quotation.