Nickel Alloy Astroloy
UNS N13017
Astroloy is a high-strength Ni-Co-Cr-Mo-Al-Ti superalloy (N13017) with a gamma-prime fraction above 40%, used for critical rotating turbine components.
Reference datasheet — Astroloy is not in the instant-quote catalog. Upload your part and an engineer will quote it in this grade or suggest the closest stocked equivalent.
Values for the STA condition
Astroloy tempers and conditions
Astroloy is supplied in 5 conditions, soft to hard. STA is the default FabDigit quotes; the values on this page are for it.
Compare all 5 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Solution treated | Pick when rough machining or hot forming is required before the final ageing cycle; strength is much lower and must be restored by ageing. | 720 | 1,100 | 28 | 30 HRC | — |
Powder HIP consolidated, no final ageing | Near-net-shape HIP preforms supplied before final solution/age; used for machining allowance reduction, then heat treated. | 950 | 1,300 | 20 | 36 HRC | 1.3 % IACS |
investment cast, solution treated and aged | Coarse-grain cast form for static and small rotating parts where creep/stress-rupture at 800–870 °C matters more than ductility or LCF. | 965 | 1,240 | 7 | 38 HRC | — |
STADefault Solution treated and aged | Standard wrought/forged disc condition (≈1150 °C solution, 870 °C stabilize, 980 °C + 650 °C/760 °C ageing) for maximum room- and mid-temperature strength. | 1,050 | 1,415 | 16 | 40 HRC | — |
powder consolidated (HIP/extruded-forged) and fully heat treated | Choose for turbine discs needing the highest low-cycle-fatigue life and uniform fine-grain properties in large sections. | 1,160 | 1,520 | 18 | 43 HRC | — |
What is Astroloy?
Astroloy is a high-strength Ni-Co-Cr-Mo-Al-Ti superalloy (N13017) with a gamma-prime fraction above 40%, used for critical rotating turbine components. It is available as wrought STA, cast-plus-STA, and powder-metallurgy HIP or as-HIP material, with STA values of 1050 MPa yield, 1415 MPa tensile, 16% elongation and 40 HRC at service temperatures to 815 °C. Machinability (12), weldability (10) and formability (8) are all poor, so parts are isothermally forged or HIP-consolidated and then finish-ground. Waspaloy or Haynes 282 are more fabricable where the full strength level is not required. Astroloy has a density of 7.91 g/cm³ (0.286 lb/in³), lighter than 89% of nickel alloy grades. It melts at 1,250°C (2,282 °F). Astroloy has a yield strength of 1,050 MPa (152 ksi) and a tensile strength of 1,415 MPa (205 ksi) — stronger than 97% of nickel alloy grades. Elongation at break is 16% and the elastic modulus is 213 GPa (30.9 Msi).
What is Astroloy used for?
- turbine discs
- high-pressure turbine blades
- critical rotating hardware
Advantages
- High strength — 1,050 MPa (152 ksi), better than 97% of nickel alloy grades
Limitations
- Difficult to weld — 10/100, worse than 94% of nickel alloy grades
- High embodied carbon — 16 kg CO₂/kg, worse than 93% of nickel alloy grades
- Needs corrosion protection — 62/100, worse than 87% of nickel alloy grades
- Limited formability — 8/100, worse than 87% of nickel alloy grades
- Limited ductility — 16%, worse than 79% of nickel alloy grades
Astroloy properties
Typical room-temperature values for Astroloy-STA; bars are the position among nickel alloy grades.
Physical3
Astroloy has a density of 7.91 g/cm³ (0.286 lb/in³), lighter than 89% of nickel alloy grades. It melts at 1,250°C (2,282 °F).
Mechanical16
Astroloy has a yield strength of 1,050 MPa (152 ksi) and a tensile strength of 1,415 MPa (205 ksi) — stronger than 97% of nickel alloy grades. Elongation at break is 16% and the elastic modulus is 213 GPa (30.9 Msi).
Thermal6
Astroloy is rated for continuous service to 815°C (1,499 °F). It conducts heat at 11 W/m·K (6.36 BTU/hr·ft·°F), worse than 60% of nickel alloy grades. Thermal expansion is 12 µm/m·K (6.67 µin/in·°F).
Electrical3
Astroloy conducts electricity at 1.3 % IACS, worse than 89% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is good (62/100), worse than 87% of nickel alloy grades.
Sustainability4
Producing a kilogram of Astroloy takes about 240 MJ of energy and emits 16 kg of CO₂ — more than 96% of nickel alloy grades. Typical recycled content is 15%.
Manufacturability8
Astroloy's machinability is not recommended (12/100, worse than 86% of nickel alloy grades); weldability not recommended (10/100); formability not recommended (8/100).
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. Astroloy is highlighted; hover a dot for its name, or open the interactive family chart.
Working with Astroloy
Is Astroloy easy to machine?
Very difficult in the aged condition — use rigid setups, low speeds (5–15 m/min carbide, 20–40 m/min ceramic), heavy positive feeds to avoid work-hardened skin, high-pressure coolant; finish grinding and creep-feed grinding are common for slots and fir-trees.
Can Astroloy be welded?
Essentially non-weldable in the fully aged state due to >40% γ′ strain-age cracking; if joining is unavoidable, weld in the solution-treated condition with electron beam or inertia friction welding and re-solution/age immediately.
Can Astroloy be formed, bent or molded?
Hot work only, in a narrow 1050–1150 °C window with tight strain-rate control (isothermal/superplastic forging for P/M billet); cold forming is impractical.
Astroloy 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 |
|---|---|---|
| C | 0.04 – 0.1 | 0.06 |
| Cr | 14 – 16 | 15 |
| Co | 16 – 18.5 | 17 |
| Mo | 4.5 – 5.75 | 5.25 |
| Alγ′ former | 3.5 – 4.5 | 4 |
| Tiγ′ former | 3.35 – 3.85 | 3.5 |
| Bgrain-boundary strengthener | 0.02 – 0.04 | 0.03 |
| Zr | 0 – 0.1 | 0.06 |
| Feresidual | ≤ 1 | 0.3 |
| Mn | ≤ 0.15 | |
| Si | ≤ 0.2 | |
| S | ≤ 0.02 | |
| Ni | balance |
What surface finishes work on Astroloy?
Shot peen critical rotating surfaces for fatigue life; typical finishes are grinding plus passivation, aluminide diffusion or MCrAlY/TBC coatings for hot sections — anodizing does not apply.
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).
Plating
Thermal Spray
Equivalent designations
Standards and trade names that resolve to Nickel Alloy Astroloy in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N13017
How much does Astroloy cost?
Astroloy is a high-cost nickel alloy ($$$$), pricier than about 78% 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.
Astroloy — frequently asked
What is Astroloy used for?
Astroloy is typically used for turbine discs, high-pressure turbine blades and critical rotating hardware. In short: highest-strength disc superalloy; powder-metallurgy HIP route; non-weldable when aged.
What is the yield strength of Astroloy?
Astroloy has a typical yield strength of 1,050 MPa (152 ksi) and a tensile strength of 1,415 MPa (205 ksi) — stronger than 97% of nickel alloy grades. Strength varies by condition: see the 5 listed tempers.
Is Astroloy easy to machine?
Not especially — machinability is rated not recommended (12/100, worse than 86% of nickel alloy grades). Very difficult in the aged condition — use rigid setups, low speeds (5–15 m/min carbide, 20–40 m/min ceramic), heavy positive feeds to avoid work-hardened skin, high-pressure coolant; finish grinding and creep-feed grinding are common for slots and fir-trees.
Can Astroloy be welded?
Not readily — weldability is rated not recommended (10/100). Essentially non-weldable in the fully aged state due to >40% γ′ strain-age cracking; if joining is unavoidable, weld in the solution-treated condition with electron beam or inertia friction welding and re-solution/age immediately.
What surface finishes work on Astroloy?
Shot peen critical rotating surfaces for fatigue life; typical finishes are grinding plus passivation, aluminide diffusion or MCrAlY/TBC coatings for hot sections — anodizing does not apply.
Can Astroloy be formed, bent or molded?
Hot work only, in a narrow 1050–1150 °C window with tight strain-rate control (isothermal/superplastic forging for P/M billet); cold forming is impractical.
What is the maximum service temperature of Astroloy?
Astroloy is rated for continuous use to about 815°C (1,499 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between Astroloy-STA and Astroloy-SOL?
STA is the default condition — standard wrought/forged disc condition (≈1150 °C solution, 870 °C stabilize, 980 °C + 650 °C/760 °C ageing) for maximum room- and mid-temperature strength. SOL: pick when rough machining or hot forming is required before the final ageing cycle; strength is much lower and must be restored by ageing. Yield strength is 1,050 MPa in STA versus 720 MPa in SOL.
How much does Astroloy cost?
Astroloy is a high-cost nickel alloy ($$$$), pricier than about 78% 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.
Sources
- ASM Specialty Handbook: Heat-Resistant Materials (Superalloys) — ASM International (1997)
- Superalloys II — High-Temperature Materials for Aerospace and Industrial Power — Wiley (1987)
- AMS 5880 / UNS N13017 nickel alloy bar and forgings — SAE International (2018)
- ASM Handbook Vol.16 Machining — Machining of Nickel Alloys — ASM International (1989)
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.