Nickel Alloy Hastelloy X
UNS N06002 · EN 2.4665, NiCr22Fe18Mo
Hastelloy X (UNS N06002, 2.4665) is a solid-solution-strengthened Ni-Cr-Fe-Mo alloy with oxidation resistance and fabricability up to 1150 °C.
Values for the Solution Annealed condition
Hastelloy X tempers and conditions
Hastelloy X is supplied in 7 conditions, soft to hard. Solution Annealed is the default FabDigit quotes; the values on this page are for it.
Compare all 7 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Finish State | Use investment casting to form complex thin-wall hot-section housings and combustor brackets in one step; dendritic segregation limits elongation to 20 %, so combine with HIP plus solution treatment. | 320 | 620 | 20 | 190 HB | 1.5 % IACS |
Hot isostatic pressed | Choose when additive or cast hot-section parts must be fatigue-critical: HIP at about 1165 °C and 100–150 MPa for 3–4 h plus solution treatment closes internal porosity and restores 45 % elongation. | 350 | 760 | 45 | 89 HRB | — |
Solution AnnealedDefault 1175 °C + (AMS 5536/5754 ) | Standard supply and service state for sheet, bar and tube after 1175 °C solution treatment and rapid cooling: highest ductility and uniform structure for forming, welding and long-term service to 1150 °C. | 360 | 755 | 43 | 195 HB | — |
/ | Use to assess end-of-life properties after carbide precipitation from 760–870 °C exposure: yield rises to 420 MPa while elongation drops to 22 %; this is not a strengthening heat treatment. | 420 | 800 | 22 | 19 HRC | 1.6 % IACS |
/ ( 1080–1175 °C ) | Apply the short 1080–1175 °C hold to additively manufactured or welded parts to remove residual stress and prevent cutting distortion while keeping part of the as-built strength at 520 MPa yield. | 520 | 790 | 30 | 20 HRC | 1.5 % IACS |
(LPBF/SLM) | Pick only for non-load-critical or pre-machined parts straight off the laser powder-bed machine: cellular solidification gives 640 MPa yield but high residual stress and marked anisotropy. | 640 | 800 | 25 | 22 HRC | — |
/ | Choose cold-rolled or cold-drawn hard strip and wire for springs, clamps and sealing wire needing 800 MPa yield at room temperature; stress relief is usually required and above ~550 °C it recrystallizes. | 800 | 1,000 | 12 | 30 HRC | 1.5 % IACS |
What is Hastelloy X?
Hastelloy X (UNS N06002, 2.4665) is a solid-solution-strengthened Ni-Cr-Fe-Mo alloy with oxidation resistance and fabricability up to 1150 °C. It is a staple for combustor cans, ducting and 3D-printed hot-section parts, supplied as sheet, plate, bar and powder; solution-annealed material gives 360 MPa yield, 755 MPa tensile and 43% elongation at 195 HB. Weldability is good (score 85), but machinability is poor (18) because the alloy work-hardens severely and conducts heat badly. For higher creep strength at similar temperatures, Alloy 617 or 230 is the usual alternative. Hastelloy X has a density of 8.22 g/cm³ (0.297 lb/in³), lighter than 60% of nickel alloy grades. It melts at 1,260°C (2,300 °F). Hastelloy X has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 755 MPa (110 ksi) — weaker than 57% of nickel alloy grades. Elongation at break is 43% and the elastic modulus is 205 GPa (29.7 Msi).
What is Hastelloy X used for?
- Gas turbine combustion cans and liners
- Transition ducts and tailpipes
- Afterburner and exhaust hardware
- 3D-printed hot-section components
- Industrial furnace muffles and retorts
- Heat-treat fixtures and baskets
- High-temperature process ducting
Advantages
- High service temperature — 1,150°C (2,102 °F), better than 95% of nickel alloy grades
- Readily welded — 85/100, better than 83% of nickel alloy grades
- Tough — resists crack growth — 120 MPa·√m (109.2 ksi·√in), better than 75% of nickel alloy grades
Limitations
- Poor heat conductor — 9.1 W/m·K (5.26 BTU/hr·ft·°F), worse than 95% of nickel alloy grades
Hastelloy X properties
Typical room-temperature values for Hastelloy X-Solution Annealed; bars are the position among nickel alloy grades.
Physical3
Hastelloy X has a density of 8.22 g/cm³ (0.297 lb/in³), lighter than 60% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical16
Hastelloy X has a yield strength of 360 MPa (52.2 ksi) and a tensile strength of 755 MPa (110 ksi) — weaker than 57% of nickel alloy grades. Elongation at break is 43% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
Hastelloy X is rated for continuous service to 1,150°C (2,102 °F). It conducts heat at 9.1 W/m·K (5.26 BTU/hr·ft·°F), worse than 95% of nickel alloy grades. Thermal expansion is 13.9 µm/m·K (7.72 µin/in·°F).
Electrical3
Hastelloy X conducts electricity at 1.5 % IACS, better than 59% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (76/100), worse than 59% of nickel alloy grades.
Sustainability4
Producing a kilogram of Hastelloy X takes about 215 MJ of energy and emits 13.5 kg of CO₂ — more than 84% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability7
Hastelloy X's machinability is poor (18/100, worse than 61% of nickel alloy grades); weldability excellent (85/100); formability very good (70/100).
Common Calculations5
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Strength versus weight in the nickel alloy family
Yield strength against density for every nickel alloy grade FabDigit runs. Hastelloy X is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Hastelloy X
Is Hastelloy X easy to machine?
The alloy work-hardens severely and conducts heat poorly: use rigid clamping, sharp positive-rake carbide or ceramic tooling, low speed with heavy feed, and keep the cutting edge in constant engagement without dwelling. Flood with high-pressure coolant.
Can Hastelloy X be welded?
GTAW, plasma and electron-beam welding all give good results, normally with matching HX wire or Hastelloy W/S filler; no preheat is required. A 1175 °C solution anneal after welding restores ductility where needed.
Can Hastelloy X be formed, bent or molded?
Cold forming and deep drawing are feasible, but springback and work hardening are pronounced — split heavy deformation into passes with intermediate anneals at 1175 °C. Hot form between 950 and 1200 °C.
Manufacturability
The process limits FabDigit's quote engine applies to Hastelloy X. Design inside these and the part quotes instantly; outside them it routes to an engineer.
CNC machining
| Machinability | Poor18 / 100 |
|---|---|
| ISO material group | S.1 |
| Cutting speed (rough / finish) | 40 / 55 m/min |
| Minimum wall | 1.5 mm |
| Minimum internal radius | 2 mm |
| Drill depth limit | 3× diameter |
| Best surface (machined / polished) | Ra 1.6 / — |
| Hardenable after machining | No |
Sheet metal
| Formability | Fair70 / 100 |
|---|---|
| Weldability | Better85 / 100 |
| Bendable | Yes |
3D printing
| Technologies | DMLS |
|---|---|
| Layer height | 20 – 60 µmdefault 30 µm |
| Minimum wall / feature | 0.5 / 0.3 mm |
| Build envelope | 250 × 250 × 325 mm |
| Supports | Yes |
| Anisotropy | Mild |
| Mandatory post-processing | heat treatment |
Hastelloy X chemical composition (wt %)
Limits by weight percent from the governing specification, written the way the spec states them — a single maximum for impurities, a range for alloying elements, and the base element as balance. Nominal is the typical mid-range value.
| Element | Spec limit (wt %) | Nominal |
|---|---|---|
| Crprimary oxidation-resistance element | 20.5 – 23 | 22 |
| Fe | 17 – 20 | 18.5 |
| Mosolid-solution strengthening | 8 – 10 | 9 |
| Co | 0.5 – 2.5 | 1.5 |
| W | 0.2 – 1 | 0.6 |
| Ccarbide strengthening | 0.05 – 0.15 | 0.1 |
| Mn | ≤ 1 | 0.5 |
| Si | ≤ 1 | 0.4 |
| Al | ≤ 0.5 | 0.2 |
| Ti | ≤ 0.15 | 0.05 |
| B | ≤ 0.01 | 0.01 |
| Pimpurity | ≤ 0.04 | |
| Simpurity | ≤ 0.03 | |
| Nibalance, about 47% | balance |
What surface finishes work on Hastelloy X?
Not anodizable; pickle and passivate, shot blast, electropolish or mechanically polish. Hot-section parts often receive aluminide or thermal-barrier coatings.
Surface treatments FabDigit runs on nickel alloy parts — pick them in the quote configurator or call them out on the drawing. Each links to its datasheet in the surface-finish library (thickness, specs, call-out, material verdicts).
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Hastelloy X in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N06002
- EN / DIN / Werkstoff-Nr.
- 2.4665NiCr22Fe18Mo
- Also called
- Alloy X
How much does Hastelloy X cost?
Hastelloy X is a premium-cost nickel alloy ($$$), pricier than about 59% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Hastelloy X — frequently asked
What is Hastelloy X used for?
Hastelloy X is typically used for gas turbine combustion cans and liners, transition ducts and tailpipes, afterburner and exhaust hardware, 3D-printed hot-section components, industrial furnace muffles and retorts and heat-treat fixtures and baskets. In short: hot-section combustor alloy.
What is the yield strength of Hastelloy X?
Hastelloy X has a typical yield strength of 360 MPa (52.2 ksi) and a tensile strength of 755 MPa (110 ksi) — weaker than 57% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is Hastelloy X easy to machine?
Not especially — machinability is rated poor (18/100, worse than 61% of nickel alloy grades). The alloy work-hardens severely and conducts heat poorly: use rigid clamping, sharp positive-rake carbide or ceramic tooling, low speed with heavy feed, and keep the cutting edge in constant engagement without dwelling. Flood with high-pressure coolant.
Can Hastelloy X be welded?
Yes — weldability is rated excellent (85/100). GTAW, plasma and electron-beam welding all give good results, normally with matching HX wire or Hastelloy W/S filler; no preheat is required. A 1175 °C solution anneal after welding restores ductility where needed.
What surface finishes work on Hastelloy X?
Not anodizable; pickle and passivate, shot blast, electropolish or mechanically polish. Hot-section parts often receive aluminide or thermal-barrier coatings.
Can Hastelloy X be formed, bent or molded?
Cold forming and deep drawing are feasible, but springback and work hardening are pronounced — split heavy deformation into passes with intermediate anneals at 1175 °C. Hot form between 950 and 1200 °C.
What is the maximum service temperature of Hastelloy X?
Hastelloy X is rated for continuous use to about 1,150°C (2,102 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Hastelloy X Solution Annealed and Hastelloy X Aged?
Solution Annealed is the default condition — standard supply and service state for sheet, bar and tube after 1175 °C solution treatment and rapid cooling: highest ductility and uniform structure for forming, welding and long-term service to 1150 °C. Aged: use to assess end-of-life properties after carbide precipitation from 760–870 °C exposure: yield rises to 420 MPa while elongation drops to 22 %; this is not a strengthening heat treatment. Yield strength is 360 MPa in Solution Annealed versus 420 MPa in Aged.
How much does Hastelloy X cost?
Hastelloy X is a premium-cost nickel alloy ($$$), pricier than about 59% of the materials FabDigit quotes. Part price depends far more on geometry, tolerance and quantity than on the raw stock — upload a CAD file for a live quote.
Can FabDigit make parts in Hastelloy X?
Yes — Hastelloy X is available for CNC machining, sheet metal and 3D printing with instant online pricing. Upload a STEP file to get a price and a DFM check.
Sources
- HASTELLOY X alloy principal features & properties (H-3009) — Haynes International (2020)
- ASTM B435 – UNS N06002 Plate, Sheet and Strip — ASTM International (2017)
- AMS 5536 / AMS 5754 – Ni-Cr-Fe-Mo Alloy Sheet & Bar — SAE International (2019)
- ASM Handbook Vol.1: Properties and Selection — Superalloys — ASM International (1990)
- MMPDS-17 nickel alloy typical property tables — Battelle/FAA (2022)
Property data is compiled from published supplier and standards handbooks and normalised for comparison; hardness values on non-Brinell scales are converted approximately for charting only. Manufacturability limits are FabDigit quote-engine defaults and may be relaxed by engineering review. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.