Nickel Alloy Hastelloy X · heat-treated state
Nickel Alloy Hastelloy X Stress Relieved
Properties of the Stress Relieved condition, compared with the other Hastelloy X tempers.
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.
What is Hastelloy X Stress Relieved?
Hastelloy X Stress Relieved is Hastelloy X heat treated to Stress Relieved — 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. Hastelloy X Stress Relieved has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 77% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi). Hastelloy X Stress Relieved has a density of 8.22 g/cm³ (0.297 lb/in³), lighter than 59% of nickel alloy grades. It melts at 1,260°C (2,300 °F). Solution Annealed is the default condition FabDigit quotes; Stress Relieved is available on request or by drawing note.
Advantages
- Readily welded — 85/100, better than 84% of nickel alloy grades
- High strength — 520 MPa (75.4 ksi), better than 77% 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 Stress Relieved properties
Typical room-temperature values for Hastelloy X Stress Relieved — 8 properties are specific to this condition; the rest are grade-level values shared by every Hastelloy X temper. Each bar shows where the value sits among the nickel alloy grades in FabDigit's library — further right is higher.
Physical3
Hastelloy X Stress Relieved has a density of 8.22 g/cm³ (0.297 lb/in³), lighter than 59% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical16
Hastelloy X Stress Relieved has a yield strength of 520 MPa (75.4 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 77% of nickel alloy grades. Elongation at break is 30% and the elastic modulus is 205 GPa (29.7 Msi).
Thermal6
Hastelloy X Stress Relieved is rated for continuous service to 900°C (1,652 °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 Stress Relieved conducts electricity at 1.5 % IACS, better than 58% 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 Stress Relieved 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 Stress Relieved's machinability is poor (17/100, worse than 71% of nickel alloy grades); weldability excellent (85/100); formability very good (70/100).
Values are nominal handbook figures for design screening. Certified mill or lot data ships with every FabDigit order on request.
Other Hastelloy X tempers and conditions
Hastelloy X is also supplied in 6 other conditions. The full side-by-side table is on the Hastelloy X overview.
- Solution AnnealedDefaultStandard 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 MPa yield · 195 HB
- As PrintedPick 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 MPa yield · 22 HRC
- Stress RelievedApply 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 MPa yield · 97 HRB
- HIPChoose 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 MPa yield · 89 HRB
Working with Hastelloy X Stress Relieved
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.
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.
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 | — |
Hastelloy X Stress Relieved — frequently asked
What is Hastelloy X Stress Relieved used for?
Hastelloy X Stress Relieved 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 Stress Relieved?
Hastelloy X Stress Relieved has a typical yield strength of 520 MPa (75.4 ksi) and a tensile strength of 790 MPa (115 ksi) — stronger than 77% of nickel alloy grades. Strength varies by condition: see the 7 listed tempers.
Is Hastelloy X Stress Relieved easy to machine?
Not especially — machinability is rated poor (17/100, worse than 71% 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 Stress Relieved 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 Stress Relieved?
Not anodizable; pickle and passivate, shot blast, electropolish or mechanically polish. Hot-section parts often receive aluminide or thermal-barrier coatings.
Can Hastelloy X Stress Relieved 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 Stress Relieved?
Hastelloy X Stress Relieved is rated for continuous use to about 900°C (1,652 °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.
Can FabDigit make parts in Hastelloy X Stress Relieved?
Yes — Hastelloy X Stress Relieved 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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.