Nickel Alloy Inconel 718-HIP (Hot isostatic pressed)
Print state
UNS N07718 · EN 2.4668 · GB GH4169
Pick for cast or additively built 718 that must be pore-free and fatigue-critical; normally followed by aging.
Values for the HIP condition
Other Inconel 718 tempers and conditions
Inconel 718 is listed in 11 conditions; see the grade overview at Inconel 718.
- Annealed
- Solution Annealed
- As Fabricated
- HIP
- As Printed
- Hot Rolled
- Stress Relieved
- As Cast
- Cold Drawn
- Aged
- Direct Aged
Compare all 11 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
1010–1065 °C mill anneal (soft, tube/sheet condition, AMS 5589/5590) | Softest wrought condition, chosen for tube bending, deep drawing and welded fabrication. | 460 | 900 | 50 | 180 HB | 1.4 % IACS |
Solution AnnealedDefault 954–1010 °C solution treated, quenched (pre-age condition, AMS 5596/5662 base) | Standard stocked condition for forming, machining and welding before customer-performed aging. | 550 | 965 | 45 | 200 HB | — |
As-Fabricated | Mill/as-fabricated UNS N07718 supplied without final solution + precipitation treatment; moderate strength, high ductility, readily formed and welded before aging. | 560 | 965 | 38 | 25 HRC | 1.4 % IACS |
HIPThis page Hot isostatic pressed | Pick for cast or additively built 718 that must be pore-free and fatigue-critical; normally followed by aging. | 620 | 1,030 | 38 | 15 HRC | 1.4 % IACS |
as-built laser powder-bed fusion / DMLS (no heat treatment) | Reference state for AM prints straight off the plate; anisotropic with high residual stress, normally stress relieved + HIP + aged before service. | 700 | 1,010 | 27 | 30 HRC | 11 W/m·K |
as-hot-worked bar and plate | Lowest-cost mill condition for re-forging or for parts that will be solution treated and aged later. | 700 | 1,050 | 30 | 25 HRC | 1.4 % IACS |
870–1065 °C stress relief (cold-worked wrought or as-built AM parts) | Used to remove residual stress from cold work, welding or laser powder-bed builds before machining/aging. | 740 | 1,030 | 30 | 32 HRC | 1.4 % IACS |
investment cast 718 per AMS 5383 | For complex cast housings, casings and manifolds where wrought properties are not required. | 800 | 965 | 8 | 36 HRC | 1.4 % IACS |
cold drawn / cold rolled bar, wire and strip (unaged) | Chosen for close tolerance bar, springs and wire where cold-work strength and good surface are needed. | 1,050 | 1,250 | 12 | 38 HRC | 1.4 % IACS |
Solution treated + precipitation aged | Full-strength service condition for turbine discs, shafts, fasteners and downhole tooling to 650 °C. | 1,170 | 1,375 | 20 | 42 HRC | 11 W/m·K |
hot/cold worked then aged without re-solution | Fine-grain, highest-strength route for discs and fasteners where creep at ≤650 °C and tensile strength dominate. | 1,250 | 1,450 | 15 | 45 HRC | 1.4 % IACS |
What is Inconel 718-HIP?
Inconel 718-HIP is Inconel 718 in the HIP condition — pick for cast or additively built 718 that must be pore-free and fatigue-critical; normally followed by aging. Inconel 718-HIP has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 200 GPa (29 Msi). Inconel 718-HIP 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). Solution Annealed is the default condition FabDigit quotes; HIP is available on request or by drawing note.
Advantages
- Polishes to a fine finish — 80/100, better than 97% of nickel alloy grades
- High strength — 620 MPa (89.9 ksi), better than 81% of nickel alloy grades
- Tough — resists crack growth — 125 MPa·√m (113.8 ksi·√in), better than 81% of nickel alloy grades
Limitations
- High embodied carbon — 16 kg CO₂/kg, worse than 93% of nickel alloy grades
Inconel 718-HIP properties
Typical room-temperature values for Inconel 718-HIP; 24 are specific to this condition. Other listed values are Inconel 718 reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
Inconel 718-HIP 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).
Mechanical15
Inconel 718-HIP has a yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 81% of nickel alloy grades. Elongation at break is 38% and the elastic modulus is 200 GPa (29 Msi).
Thermal6
Inconel 718-HIP 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
Inconel 718-HIP conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (79/100), better than 58% of nickel alloy grades.
Sustainability4
Producing a kilogram of Inconel 718-HIP takes about 250 MJ of energy and emits 16 kg of CO₂ — more than 97% of nickel alloy grades. Typical recycled content is 35%.
Manufacturability8
Inconel 718-HIP's machinability is poor (17/100, worse than 69% of nickel alloy grades); weldability good (68/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with Inconel 718-HIP
Is Inconel 718 easy to machine?
Machine in the solution-annealed state where possible; rigid setups, low speed (20–35 m/min carbide, 150–250 m/min ceramic), heavy positive feed, sharp tools and flood coolant to beat work hardening and notch wear.
Can Inconel 718 be welded?
Very good fusion weldability by GTAW/EBW/LBW with ERNiFeCr-2 (718) filler in the annealed condition; keep heat input low, avoid restrained thick sections, and post-weld solution treat + age to restore full strength.
Can Inconel 718 be formed, bent or molded?
Hot work at 1010–1120 °C; cold form only from annealed stock with high tooling forces and intermediate anneals — springback and tool wear are severe.
What surface finishes work on Inconel 718?
Not anodizable; use pickling/passivation, electropolishing, abrasive blasting or shot peening for fatigue, plus diffusion or PVD coatings for high-temperature wear.
Inconel 718 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 |
|---|---|---|
| Niplus Co if reported | 50 – 55 | 53 |
| Cr | 17 – 21 | 19 |
| NbNb + Ta | 4.75 – 5.5 | 5.13 |
| Mo | 2.8 – 3.3 | 3.05 |
| Ti | 0.65 – 1.15 | 0.9 |
| Al | 0.2 – 0.8 | 0.5 |
| Co | ≤ 1 | 0.3 |
| C | ≤ 0.08 | 0.04 |
| Mn | ≤ 0.35 | 0.1 |
| Si | ≤ 0.35 | 0.1 |
| Cu | ≤ 0.3 | 0.05 |
| B | ≤ 0.01 | 0 |
| P | ≤ 0.02 | |
| S | ≤ 0.02 | |
| Tamax, when specified separately | ≤ 0.05 | |
| Febalance, typically 17–20 % | balance |
Inconel 718-HIP — frequently asked
What is Inconel 718-HIP used for?
Inconel 718-HIP is typically used for gas turbine disks and blades, high-temperature fasteners and studs, turbine casings and seal rings, rocket engine injectors and manifolds, downhole drilling and completion tooling and cryogenic valve stems and springs. In short: workhorse aerospace superalloy.
What is the yield strength of Inconel 718-HIP?
Inconel 718-HIP has a typical yield strength of 620 MPa (89.9 ksi) and a tensile strength of 1,030 MPa (149 ksi) — stronger than 81% of nickel alloy grades. Strength varies by condition: see the 11 listed tempers.
Is Inconel 718-HIP easy to machine?
Not especially — machinability is rated poor (17/100, worse than 69% of nickel alloy grades). Machine in the solution-annealed state where possible; rigid setups, low speed (20–35 m/min carbide, 150–250 m/min ceramic), heavy positive feed, sharp tools and flood coolant to beat work hardening and notch wear.
Can Inconel 718-HIP be welded?
Yes — weldability is rated good (68/100). Very good fusion weldability by GTAW/EBW/LBW with ERNiFeCr-2 (718) filler in the annealed condition; keep heat input low, avoid restrained thick sections, and post-weld solution treat + age to restore full strength.
What surface finishes work on Inconel 718-HIP?
Not anodizable; use pickling/passivation, electropolishing, abrasive blasting or shot peening for fatigue, plus diffusion or PVD coatings for high-temperature wear.
Can Inconel 718-HIP be formed, bent or molded?
Hot work at 1010–1120 °C; cold form only from annealed stock with high tooling forces and intermediate anneals — springback and tool wear are severe.
What is the maximum service temperature of Inconel 718-HIP?
Inconel 718-HIP 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 Inconel 718 Solution Annealed and Inconel 718 Aged?
Solution Annealed is the default condition — standard stocked condition for forming, machining and welding before customer-performed aging. Aged: full-strength service condition for turbine discs, shafts, fasteners and downhole tooling to 650 °C. Yield strength is 550 MPa in Solution Annealed versus 1,170 MPa in Aged.
Can FabDigit make parts in Inconel 718-HIP?
Yes — Inconel 718-HIP 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
- INCONEL alloy 718 technical bulletin — Special Metals Corporation (2007)
- AMS 5662 / AMS 5663 — Nickel Alloy Bars, Forgings and Rings, 718 — SAE International (2020)
- ASTM B637 — Precipitation-Hardening Nickel Alloy Bars, Forgings and Forging Stock for High-Temperature Service — ASTM (2018)
- ASTM B670 / AMS 5596 — Alloy 718 Plate, Sheet and Strip — ASTM / SAE (2019)
- AMS 5383 — Nickel Alloy Castings, Investment, 718 — SAE International (2018)
- ASM Handbook Vol.2 — Properties and Selection: Nonferrous Alloys and Special-Purpose Materials — ASM International (1990)
- MMPDS-17 — Metallic Materials Properties Development and Standardization — Battelle/FAA (2022)
- EOS NickelAlloy IN718 material data sheet — EOS GmbH (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.