What is "Annealed Inconel 718 Plate" Mean?
Annealed Inconel 718 plate refers to Inconel 718 that has undergone solution heat treatment (solution annealing) but has not yet been precipitation aged.Typical Annealing (Solution Treatment) Process,Heat to 940–980 °C (1725–1800 °F),Hold to dissolve strengthening precipitates,Air cool or rapid cool.This process produces a soft, ductile, and uniform microstructure, ideal for further processing.
Why Buyers Specify Annealed Inconel 718 Plate?
From a procurement perspective, annealed plate is preferred because it offers:
✅ Better machinability than aged material
✅ Lower cutting tool wear and machining cost
✅ Reduced risk of cracking during forming or welding
✅ Flexibility for custom aging after fabrication
Buyer insight:
Most manufacturers machine and fabricate Inconel 718 in the annealed condition, then apply final aging heat treatment to meet strength requirements.
Mechanical Properties of Annealed Inconel 718 Plate
| Property | Annealed Condition |
|---|---|
| Tensile Strength | 930–1030 MPa |
| Yield Strength (0.2%) | 450–550 MPa |
| Elongation | ≥ 30% |
| Hardness | HRC 20 – 25 |
| Impact Toughness | Excellent |
Chemical Composition (UNS N07718, wt.%)
| Element | Content |
|---|---|
| Nickel (Ni) | 50.0 – 55.0 |
| Chromium (Cr) | 17.0 – 21.0 |
| Iron (Fe) | Balance |
| Niobium + Tantalum (Nb+Ta) | 4.75 – 5.50 |
| Molybdenum (Mo) | 2.80 – 3.30 |
| Titanium (Ti) | 0.65 – 1.15 |
| Aluminum (Al) | 0.20 – 0.80 |
| Carbon (C) | ≤ 0.08 |
Annealed vs Aged Inconel 718 Plate
| Item | Annealed | Aged (AMS 5662 / 5663) |
|---|---|---|
| Hardness | HRC 20–25 | HRC 36–45 |
| Machinability | Better | Difficult |
| Strength | Moderate | Very high |
| Formability | Excellent | Limited |
| Typical Use | Machining, forming | Final service condition |
Applicable Standards for Annealed Inconel 718 Plate
Annealed Inconel 718 plate is commonly supplied under:
ASTM B670 / B637
AMS 5596 / AMS 5597 (plate & sheet)
EN 10095 / EN equivalents
ASME specifications
Buyers should clearly state "solution annealed" or "annealed, not aged" in purchase orders.
Applications of Annealed Inconel 718 Plate
Aerospace structural blanks
Oil & gas pressure components (pre-machining)
Nuclear and power-generation parts
High-temperature flanges and rings
Precision CNC-machined components
Is annealed Inconel 718 the same as soft condition?
Yes, for Inconel 718, the annealed condition is essentially its soft, work-ready state, often called "solution-annealed" (like under AMS 5662), making it highly ductile, machinable, and formable before any final age-hardening for maximum strength.
Can annealed Inconel 718 plate be used directly in service?
Yes, annealed Inconel 718 plates can be used directly in some applications, but for high-strength applications (such as aircraft engines, fasteners, or critical oil and gas components), further age hardening (precipitation hardening) is usually required to achieve optimal mechanical properties under high heat and high stress conditions. Nevertheless, annealed Inconel 718 plates are easy to machine and weld before hardening. The annealed state provides good formability, while age hardening allows for the full realization of its high-temperature strength.
who choose us?
To better serve international buyers, GNEE offers flexible payment methods, including T/T (30% down payment, 70% before shipment), sight letter of credit (L/C), and DP/DA payment options for long-term partners; uses seaworthy wooden crates or pallets with moisture-proof, rust-proof, and edge protection measures, and clearly marks the heat number and dimensions on the plates; guarantees efficient delivery, with in-stock Alloy 718 plates shipped within 7-10 days and custom sizes within 15-25 days; provides complete factory test certificates (MTC 3.1), and boasts extensive global export experience covering the Middle East, Europe, the United States, and Southeast Asia.
one-stop solution
professional team
high quality
