Nickel Alloy 718Plus-AN (Solution annealed)
Print state
UNS N07716 · also Allvac 718Plus
Softest supplied condition for machining, cold forming and welding before the customer ages the part.
Values for the AN condition
Other 718Plus tempers and conditions
718Plus is listed in 6 conditions; see the grade overview at 718Plus.
Compare all 6 conditionsHide
| Condition · open for datasheet | Best for | Yield MPa | Tensile MPa | Elong. % | Hardness | Conductivity |
|---|---|---|---|---|---|---|
ANThis page Solution annealed | Softest supplied condition for machining, cold forming and welding before the customer ages the part. | 500 | 950 | 50 | 22 HRC | — |
As-welded deposit | Condition of the joint before PWHT; useful for fit-up and leak-tight assemblies, but strength must be recovered by a post-weld solution + double age. | 630 | 980 | 25 | 28 HRC | 1.5 % IACS |
Super-solvus solution (1010–1038 °C) + double age | Coarse-grain version for creep- and dwell-crack-growth-limited hot sections; trades some tensile strength and LCF life for creep/rupture capability. | 1,130 | 1,380 | 14 | 42 HRC | — |
AM (L-PBF/EB-PBF) + HIP + solution + double age | Additively manufactured parts after HIP closure of porosity and full aging; slightly lower ductility and more property scatter than wrought forgings. | 1,150 | 1,400 | 14 | 43 HRC | 1.4 % IACS |
STADefault Solution treated and aged | Standard sub-solvus fine-grain heat treatment — the default condition for discs, rings, shafts and fasteners needing maximum tensile/fatigue strength to 704 °C. | 1,220 | 1,480 | 17 | 44 HRC | — |
Direct aged | Retains forging warm-work substructure for the highest yield strength and tensile properties in fasteners and small forgings; lowest ductility of the aged conditions. | 1,290 | 1,520 | 14 | 46 HRC | — |
What is 718Plus-AN?
718Plus-AN is 718Plus in the AN condition — softest supplied condition for machining, cold forming and welding before the customer ages the part. 718Plus-AN has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 73% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 197 GPa (28.6 Msi). 718Plus-AN has a density of 8.22 g/cm³ (0.297 lb/in³), lighter than 60% of nickel alloy grades. It melts at 1,260°C (2,300 °F). STA is the default condition FabDigit quotes; AN is available on request or by drawing note.
Advantages
- Ductile — tolerates forming and impact — 50%, better than 88% of nickel alloy grades
718Plus-AN properties
Typical room-temperature values for 718Plus-AN; 14 are specific to this condition. Other listed values are 718Plus reference data and may not represent this condition. Bars are the position among nickel alloy grades.
Physical3
718Plus-AN has a density of 8.22 g/cm³ (0.297 lb/in³), lighter than 60% of nickel alloy grades. It melts at 1,260°C (2,300 °F).
Mechanical16
718Plus-AN has a yield strength of 500 MPa (72.5 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 73% of nickel alloy grades. Elongation at break is 50% and the elastic modulus is 197 GPa (28.6 Msi).
Thermal6
718Plus-AN is rated for continuous service to 650°C (1,202 °F). It conducts heat at 10.9 W/m·K (6.3 BTU/hr·ft·°F), worse than 64% of nickel alloy grades. Thermal expansion is 12.8 µm/m·K (7.11 µin/in·°F).
Electrical3
718Plus-AN conducts electricity at 1.4 % IACS, worse than 65% of nickel alloy grades.
Chemical & Environmental3
Corrosion resistance is very good (72/100), worse than 71% of nickel alloy grades.
Sustainability4
Producing a kilogram of 718Plus-AN 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
718Plus-AN's machinability is poor (20/100, better than 53% of nickel alloy grades); weldability very good (75/100); formability fair (50/100).
Values are nominal handbook figures for design screening. Confirm any required mill or lot documentation when quoting.
Working with 718Plus-AN
Is 718Plus easy to machine?
Machine soft in the annealed condition where possible; when aged use rigid setups, positive-rake carbide or SiAlON ceramic at low speed/high feed with heavy flood coolant, and avoid dwelling to prevent work-hardened glaze.
Can 718Plus be welded?
GTAW/EB/inertia welding with matching 718Plus filler is practical — the γ′ kinetics give better resistance to strain-age (PWHT) cracking than Waspaloy; weld in the annealed condition and follow with full solution + double age.
Can 718Plus be formed, bent or molded?
Hot forge in the ~950–1120 °C window with sub-solvus finishing to control grain size; cold forming only in the annealed state with interstage anneals due to rapid work hardening.
What surface finishes work on 718Plus?
Grit-blast and pickle or electropolish to remove Al/Ti-rich forging scale; not anodizable — use shot peening for fatigue life and aluminide or thermal-spray coatings for hot-gas surfaces.
718Plus 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 |
|---|---|---|
| Cr | 17 – 21 | 18 |
| Cokey addition vs Alloy 718 | 8 – 10 | 9 |
| Fe | 8 – 10 | 9.5 |
| Nbγ′/γ″ former | 5.2 – 5.8 | 5.45 |
| Mo | 2.5 – 3.1 | 2.75 |
| Wsolid-solution strengthener | 0.8 – 1.4 | 1 |
| Alraises Al/Ti ratio → γ′ dominant | 1.2 – 1.7 | 1.45 |
| Ti | 0.5 – 1 | 0.7 |
| C | 0.01 – 0.05 | 0.02 |
| Bgrain-boundary strengthener | 0 – 0.01 | 0.01 |
| Pdeliberate addition, improves creep | 0.01 – 0.02 | 0.01 |
| Mn | ≤ 0.35 | 0.05 |
| Si | ≤ 0.35 | 0.1 |
| S | ≤ 0.02 | 0 |
| Cu | ≤ 0.3 | 0.05 |
| Nibalance, nominally ~52% | balance | — |
718Plus-AN — frequently asked
What is 718Plus-AN used for?
718Plus-AN is typically used for turbine disks, compressor components, aerospace rotating hardware and high-temperature fasteners. In short: 55 °C above Alloy 718; weldable disk superalloy; better than Waspaloy fabricability.
What is the yield strength of 718Plus-AN?
718Plus-AN has a typical yield strength of 500 MPa (72.5 ksi) and a tensile strength of 950 MPa (138 ksi) — stronger than 73% of nickel alloy grades. Strength varies by condition: see the 6 listed tempers.
Is 718Plus-AN easy to machine?
Not especially — machinability is rated poor (20/100, better than 53% of nickel alloy grades). Machine soft in the annealed condition where possible; when aged use rigid setups, positive-rake carbide or SiAlON ceramic at low speed/high feed with heavy flood coolant, and avoid dwelling to prevent work-hardened glaze.
Can 718Plus-AN be welded?
Yes — weldability is rated very good (75/100). GTAW/EB/inertia welding with matching 718Plus filler is practical — the γ′ kinetics give better resistance to strain-age (PWHT) cracking than Waspaloy; weld in the annealed condition and follow with full solution + double age.
What surface finishes work on 718Plus-AN?
Grit-blast and pickle or electropolish to remove Al/Ti-rich forging scale; not anodizable — use shot peening for fatigue life and aluminide or thermal-spray coatings for hot-gas surfaces.
Can 718Plus-AN be formed, bent or molded?
Hot forge in the ~950–1120 °C window with sub-solvus finishing to control grain size; cold forming only in the annealed state with interstage anneals due to rapid work hardening.
What is the maximum service temperature of 718Plus-AN?
718Plus-AN 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 718Plus-STA and 718Plus-AN?
STA is the default condition — standard sub-solvus fine-grain heat treatment — the default condition for discs, rings, shafts and fasteners needing maximum tensile/fatigue strength to 704 °C. AN: softest supplied condition for machining, cold forming and welding before the customer ages the part. Yield strength is 1,220 MPa in STA versus 500 MPa in AN.
Sources
- ATI Allvac 718Plus Alloy Technical Data Sheet — ATI (Allegheny Technologies) (2020)
- Superalloys 2004 — 'Development of a New 700 °F Capable Nickel Base Superalloy' (Cao & Kennedy) — TMS (2004)
- ASM Handbook Vol. 1 — Properties and Selection: Irons, Steels and High-Performance Alloys — ASM International (1990)
- AMS specifications for 718Plus bar, forgings and rings (nickel alloy, corrosion & heat resistant) — SAE International (2018)
- Superalloy physical/mechanical property compilations (VIM+VAR wrought Ni-Cr-Fe) — MMPDS / Special Metals comparative data (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.