Nickel Alloy IN-718 Cast-HOM
Heat-treated state
UNS N07718 · also Inconel 718
HOM = 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.
Values for the HOM condition
Other IN-718 Cast tempers and conditions
IN-718 Cast is listed in 6 conditions; see the grade overview at IN-718 Cast.
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 | — |
HOMThis page 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-HOM?
IN-718 Cast-HOM is IN-718 Cast heat treated to HOM — softest supplied condition — dissolves Laves phase and gives maximum ductility for weld repair and rough machining before ageing. IN-718 Cast-HOM has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 61% of nickel alloy grades. Elongation at break is 24% and the elastic modulus is 197 GPa (28.6 Msi). IN-718 Cast-HOM 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). HT is the default condition FabDigit quotes; HOM is available on request or by drawing note.
Limitations
- 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-HOM properties
Typical room-temperature values for IN-718 Cast-HOM; 11 are specific to this condition. Other listed values are IN-718 Cast reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
IN-718 Cast-HOM 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-HOM has a yield strength of 415 MPa (60.2 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 61% of nickel alloy grades. Elongation at break is 24% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
IN-718 Cast-HOM is rated for continuous service to 600°C (1,112 °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-HOM 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-HOM 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-HOM's machinability is poor (23/100, better than 70% of nickel alloy grades); weldability very good (72/100); formability not recommended (8/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with IN-718 Cast-HOM
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.
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.
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 | — |
IN-718 Cast-HOM — frequently asked
What is IN-718 Cast-HOM used for?
IN-718 Cast-HOM 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-HOM?
IN-718 Cast-HOM has a typical yield strength of 415 MPa (60.2 ksi) and a tensile strength of 850 MPa (123 ksi) — stronger than 61% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is IN-718 Cast-HOM easy to machine?
Not especially — machinability is rated poor (23/100, better than 70% 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-HOM be welded?
Yes — weldability is rated very good (72/100). 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-HOM?
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-HOM 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-HOM?
IN-718 Cast-HOM is rated for continuous use to about 600°C (1,112 °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.
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. Nothing on this page is a certification — request mill certs, CoC or material test reports with your order.