Hastelloy® X (UNS N06602)
High-Temperature-Nickel-Chromium-Iron-Molybdenum-Alloy
What Is Hastelloy® X?
Hastelloy® X (UNS N06002) is a solid-solution strengthened nickel-chromium-iron-molybdenum alloy developed for outstanding high-temperature strength and oxidation resistance. With excellent oxidation resistance up to 2200°F (1204°C), it is one of the most reliable materials for extreme thermal environments and is the workhorse alloy for gas turbine combustor and transition hardware.
In addition to its high-temperature performance, Hastelloy X offers excellent fabrication and forming characteristics, making it a preferred choice for combustion cans, transition ducts, flame holders, and other complex hot-gas-path components in both aerospace and industrial gas turbines.
The alloy provides good resistance to stress-corrosion cracking in petrochemical service and resists oxidation, carburization, and nitriding in still air at elevated temperatures.
Hastelloy® X Standards and Designations
Common Names & Cross-References
Designation | Value |
|---|---|
Trade Names | Hastelloy® X, Alloy X, Hast X, Pyromet® 680 |
UNS | N06002 |
German (W.Nr. / DIN) | 2.4665 — NiCr22Fe18Mo |
GE Specifications | B50A436, B50T83, B50TF24 |
Properties of Hastelloy® X
Hastelloy® X Chemical Composition
|
Element |
Composition (%) |
|---|---|
| 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 |
| Manganese (Mn) | 1.0 max |
| Silicon (Si) | 1.0 max |
| Carbon (C) | 0.05 – 0.15 |
| Boron (B) | 0.008 max |
| Phosphorus (P) | 0.04 max |
| Sulfur (S) | 0.03 max |
Typical Mechanical Properties (Annealed)
| Property | Typical | Spec Min |
|---|---|---|
| Tensile Strength | 115 ksi (793 MPa) | 100 ksi |
| Yield Strength (0.2%) | 55 ksi (380 MPa) | 45 ksi |
| Elongation (in 2 in.) | 45% | 35% |
| Hardness | Rockwell B 92 | B 100 max |
About Hastelloy® X?
Key Features & Advantages
- Outstanding oxidation resistance up to 2200°F (1204°C)
- Excellent high-temperature strength through solid-solution strengthening
- Strong resistance to stress-corrosion cracking in petrochemical environments
- Good carburization and nitriding resistance in industrial furnace atmospheres
- Excellent forming and fabrication characteristics
- ASME Boiler and Pressure Vessel Code Section VIII, Division 1 approved
Common Applications of Hastelloy® X
- Gas turbine combustion cans, liners, and combustor hardware
- Transition ducts and exhaust components
- Flame holders and spray bars
- Industrial furnace rolls, retorts, baffles, and muffles
- Aerospace engine hot-section components and afterburner hardware
- High-temperature petrochemical and processing hardware
Primary Markets Served
- Aerospace & Defense
- Power Generation & Gas Turbines
- Industrial Furnaces & Heat Treatment
- Petrochemical Processing
When to Specify Hastelloy® X
- Hastelloy X vs. Inconel 625 — X has better long-term oxidation resistance above ~1500°F and is the standard for combustor hardware. 625 has higher strength below ~1500°F and better corrosion resistance in chloride media.
- Hastelloy X vs. Inconel 718 — 718 is precipitation-hardened with much higher strength but limited to ~1300°F service. X is the choice when service temperatures exceed 718’s range.
- Hastelloy X vs. Haynes 230 — Haynes 230 has higher creep strength at the highest temperatures (>1800°F). X is preferred when fabricability and consistent supply are priorities.
- Hastelloy X vs. 309/310 stainless — X is the upgrade for any application where 300-series stainless oxidizes excessively or loses strength at high temperature.
Why Source 21?
- ISO 9001-certified quality system with full chemistry and mechanical traceability on every shipment
- Multi-million dollar national inventory across stainless, nickel alloys, copper, and brass
- Strong domestic and international mill relationships, including premium specialty mill partnerships
- In-house slitting, edging, leveling, and cut-to-length capabilities
- Contract programs, blanket orders, and vendor-managed inventory (VMI) for production accounts
- Responsive technical support for tight-tolerance and certification-driven work
Request A Quote
Contact Source 21 today for Hastelloy X pricing, availability, and processing options. Our team responds quickly, asks the right questions, and gets you accurate quotes on real material — not vague placeholders.
Call 631-821-1101 or request a quote online to get started.