Nickel Alloy IN-718 Cast
UNS N07718 · also Inconel 718
IN-718 Cast is the investment-cast form of the Nb-strengthened Ni-Fe-Cr superalloy 718 (Inconel 718, UNS N07718), hardened by gamma-double-prime precipitation during solution treatment and ageing.
Reference datasheet — IN-718 Cast 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 HT condition
IN-718 Cast tempers and conditions
IN-718 Cast is supplied in 6 conditions, soft to hard. HT is the default FabDigit quotes; the values on this page are for it.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
Hot isostatic pressed | Porosity-closed, soft and ductile condition supplied when the customer will weld, machine and age the casting themselves. | 400 | 830 | 25 | 200 HB | — |
Homogenized / solution annealed (1093–1163 °C, air or furnace cool),… | Softest supplied condition — dissolves Laves phase and gives maximum ductility for weld repair and rough machining before ageing. | 415 | 850 | 24 | 210 HB | — |
Spheroidize annealed | Pick only for non-critical, low-stress hardware or as an intermediate state before HIP/heat treatment. | 470 | 760 | 8 | 27 HRC | — |
High-temperature solution 1093 °C + double age | Choose when stress-rupture and creep life at 600–650 °C matter more than peak room-temperature strength (coarser grain, more δ-free matrix). | 827 | 965 | 6 | 36 HRC | — |
HTDefault Homogenize + solution 954–982 °C + double age 718 °C/8 h + 621 °C/8 h | Standard commercial condition for cast 718 hardware — best room-temperature strength/hardness up to ~650 °C. | 862 | 1,000 | 7 | 38 HRC | — |
Hot isostatic press, homogenize, solution and double age | Aerospace/rotating-hardware condition: HIP closes shrinkage porosity so fatigue life, ductility and toughness are markedly better than plain HT. | 900 | 1,060 | 11 | 39 HRC | — |
What is IN-718 Cast?
IN-718 Cast is the investment-cast form of the Nb-strengthened Ni-Fe-Cr superalloy 718 (Inconel 718, UNS N07718), hardened by gamma-double-prime precipitation during solution treatment and ageing. Aged castings provide 862 MPa yield, 1000 MPa tensile, 7% elongation and 352 HB (38 HRC) with service to 650 °C, and are used where the wrought grade's geometry is impractical. HIP plus homogenisation is normally specified to close microporosity and dissolve Nb-rich Laves phase. Machinability is poor (rating 15); above 650 °C a gamma-prime alloy such as K403 is required. IN-718 Cast has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,260°C (2,300 °F). IN-718 Cast has a yield strength of 862 MPa (125 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 92% of nickel alloy grades. Elongation at break is 7% and the elastic modulus is 197 GPa (28.6 Msi).
What is IN-718 Cast used for?
- turbine casings
- aerospace structural castings
- high-temperature fasteners housings
Advantages
- High strength — 862 MPa (125 ksi), better than 92% of nickel alloy grades
Limitations
- Limited ductility — 7%, worse than 88% of nickel alloy grades
- Limited formability — 8/100, worse than 87% of nickel alloy grades
- Low fracture toughness — 70 MPa·√m (63.7 ksi·√in), worse than 85% of nickel alloy grades
IN-718 Cast properties
Typical room-temperature values for IN-718 Cast-HT; bars are the position among nickel alloy grades.
Physical3
IN-718 Cast has a density of 8.19 g/cm³ (0.296 lb/in³), lighter than 68% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical16
IN-718 Cast has a yield strength of 862 MPa (125 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 92% of nickel alloy grades. Elongation at break is 7% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
IN-718 Cast is rated for continuous service to 650°C (1,202 °F). It conducts heat at 11.4 W/m·K (6.59 BTU/hr·ft·°F), better than 53% of nickel alloy grades. Thermal expansion is 13 µm/m·K (7.22 µin/in·°F).
Electrical3
IN-718 Cast conducts electricity at 1.4 % IACS, worse than 65% 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 IN-718 Cast takes about 215 MJ of energy and emits 14.5 kg of CO₂ — more than 84% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
IN-718 Cast's machinability is poor (15/100, worse than 76% of nickel alloy grades); weldability good (62/100); 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. IN-718 Cast is highlighted; hover a dot for its name, or open the interactive family chart.
Working with IN-718 Cast
Is IN-718 Cast easy to machine?
Machine in the solution-annealed/HIP condition where possible; when aged use rigid setups, positive-rake carbide or whisker/SiAlON ceramic tooling, 15–30 m/min carbide surface speed, heavy flood coolant and constant feed to avoid work-hardened glazing.
Can IN-718 Cast be welded?
Excellent weld repairability by GTAW/EB/laser with ERNiFeCr-2 (718) filler thanks to sluggish γ″ kinetics; weld in the solution-annealed state, keep interpass low, then re-solution and re-age; avoid welding fully aged sections to limit HAZ liquation cracking in Laves-rich areas.
Can IN-718 Cast be formed, bent or molded?
Vacuum investment casting (VIM/VAR stock) with tight thermal-gradient control; HIP at ~1163 °C/100 MPa plus long homogenization is standard to close microporosity and dissolve Nb-rich Laves that otherwise embrittle the casting.
IN-718 Cast 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 |
|---|---|---|
| NiNi+Co | 50 – 55 | 53 |
| Cr | 17 – 21 | 19 |
| NbNb+Ta | 4.75 – 5.5 | 5.1 |
| Mo | 2.8 – 3.3 | 3.05 |
| Ti | 0.65 – 1.15 | 0.9 |
| Al | 0.2 – 0.8 | 0.5 |
| Co | ≤ 1 | 0.2 |
| Ccast grades run higher C than wrought | 0.02 – 0.1 | 0.05 |
| Mn | ≤ 0.35 | 0.1 |
| Si | ≤ 0.35 | 0.15 |
| Cu | ≤ 0.3 | 0.05 |
| B | ≤ 0.01 | 0 |
| P | ≤ 0.02 | 0.01 |
| S | ≤ 0.02 | 0.01 |
| Febalance, typically 17–19 % | balance |
What surface finishes work on IN-718 Cast?
Not anodizable — grit-blast/chem-mill to remove alpha case and shell reaction layer, then passivate or electropolish; aluminide, Pt-Al or MCrAlY/thermal-barrier coatings are used for hot-gas surfaces, electroless Ni or shot peening for wear/fatigue duty.
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 IN-718 Cast in FabDigit's catalog. Equivalence is nominal — check the exact specification when certification matters.
- UNS
- N07718
- Trade names
- Inconel 718
- Similar grades
- A494 CU5? not applicable
How much does IN-718 Cast cost?
IN-718 Cast 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.
IN-718 Cast — frequently asked
What is IN-718 Cast used for?
IN-718 Cast is typically used for turbine casings, aerospace structural castings and high-temperature fasteners housings. In short: most weld-repairable cast superalloy; cast route for 718 geometry; 650 °C strength limit.
What is the yield strength of IN-718 Cast?
IN-718 Cast has a typical yield strength of 862 MPa (125 ksi) and a tensile strength of 1,000 MPa (145 ksi) — stronger than 92% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is IN-718 Cast easy to machine?
Not especially — machinability is rated poor (15/100, worse than 76% of nickel alloy grades). Machine in the solution-annealed/HIP condition where possible; when aged use rigid setups, positive-rake carbide or whisker/SiAlON ceramic tooling, 15–30 m/min carbide surface speed, heavy flood coolant and constant feed to avoid work-hardened glazing.
Can IN-718 Cast be welded?
Yes — weldability is rated good (62/100). Excellent weld repairability by GTAW/EB/laser with ERNiFeCr-2 (718) filler thanks to sluggish γ″ kinetics; weld in the solution-annealed state, keep interpass low, then re-solution and re-age; avoid welding fully aged sections to limit HAZ liquation cracking in Laves-rich areas.
What surface finishes work on IN-718 Cast?
Not anodizable — grit-blast/chem-mill to remove alpha case and shell reaction layer, then passivate or electropolish; aluminide, Pt-Al or MCrAlY/thermal-barrier coatings are used for hot-gas surfaces, electroless Ni or shot peening for wear/fatigue duty.
Can IN-718 Cast be formed, bent or molded?
Vacuum investment casting (VIM/VAR stock) with tight thermal-gradient control; HIP at ~1163 °C/100 MPa plus long homogenization is standard to close microporosity and dissolve Nb-rich Laves that otherwise embrittle the casting.
What is the maximum service temperature of IN-718 Cast?
IN-718 Cast is rated for continuous use to about 650°C (1,202 °F). Strength falls off well before that limit — check the elevated-temperature data for load-bearing parts.
What is the difference between IN-718 Cast-HT and IN-718 Cast-HIP?
HT is the default condition — standard commercial condition for cast 718 hardware — best room-temperature strength/hardness up to ~650 °C. HIP: porosity-closed, soft and ductile condition supplied when the customer will weld, machine and age the casting themselves. Yield strength is 862 MPa in HT versus 400 MPa in HIP.
How much does IN-718 Cast cost?
IN-718 Cast 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
- AMS 5383 — Nickel Alloy, Corrosion and Heat Resistant, Investment Castings, 52.5Ni-19Cr-3.0Mo-5.1Cb-0.90Ti-0.50Al-18Fe, Vacuum Melted, Homogenization and Solution Heat Treated — SAE International (2018)
- UNS N07718 designation data — SAE/ASTM Unified Numbering System (2017)
- INCONEL alloy 718 technical bulletin — Special Metals Corporation (2007)
- ASM Handbook Vol.1 — Properties and Selection: Irons, Steels, and High-Performance Alloys (cast superalloys) — ASM International (1990)
- ASM Handbook Vol.19 — Fatigue and Fracture (superalloys) — ASM International (1996)
- Superalloys: A Technical Guide, 2nd ed. (Donachie & Donachie) — ASM International (2002)
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.