ALLOY 718 Aero
NICKEL & SUPER ALLOYS
UNS N07718: ASTM B637 AMS 5662 & 5663
UT to AMS-STD-2154 Class AA
GENERAL SCOPE
Alloy 718 Aero is a precipitation hardenable nickel-based superalloy with additions of molybdenum, niobium, titanium and aluminium initially developed for use in rotating parts in aerospace and gas turbine applications.
It has excellent yield and tensile strength and creep rupture properties up to 704°C (1300°F), and is suitable for long-term application under high stress and temperature. It also displays excellent resistance to oxidation, corrosion resistance, and good weldability.
It is a widely used alloy in the aerospace industry in critical applications such as engine components, airframe parts, and fasteners.
CHEMICAL COMPOSITION
| C | Si | Mn | P | S | Cr | Ni | Mo | Co | Nb | Ti | Al | B | Cu | Fe | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 17.00 | 50.00 | 2.8 | - | 4.75 | 0.65 | 0.35 | - | ||
| Max | 0.08 | 0.35 | 0.35 | 0.015 | 0.015 | 21.0 | 55.00 | 3.3 | 1.0 | 5.5 | 1.15 | 0.80 | 0.0006 | 0.3 | Bal. |
*limits are also placed on trace elements Pb, Bi, Se
MECHANICAL PROPERTIES
It is also supplied fully heat treated with properties as shown below.
| U.T.S | 185ksi | 1276MPa |
| 0.2% Proof Stress | 150ksi | 1034MPa |
| Elongation | 12% | |
| Red of Area | 15% |
| U.T.S | 145ksi | 1000MPa |
| 0.2% Proof Stress | 125ksi | 862MPa |
| Elongation | 12% | |
| Red of Area | 15% |