Nickel-chromium-molybdenum alloy Inconel 718 is designed to withstand a wide range of severely corrosive environments, as well as pitting and crevice corrosion. Inconel 718 is also resistant to high temperatures. At high temperatures, the yield, tensile, and creep-rupture properties of this nickel steel alloy are exceptionally high, as is its toughness.
Alloy 718 is hardened by the precipitation of secondary nickel- (aluminium, titanium, niobium) phases giving the alloy a combination of high strength and good corrosion resistance.
Chemical Composition of Alloy 718 for Aerospace:
| C | Mn | Si | P | S | Cr | Ni | Mo | Nb + Ta | Ti | Ai | Co | B | Cu | Fe | - | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Min | - | - | - | - | - | 17.0 | 50.0 | 2.80 | 4.75 | 0.65 | 0.20 | - | - | - | Bal | % |
| Max | 0.08 | 0.35 | 0.35 | 0.015 | 0.015 | 21.0 | 55.0 | 3.30 | 5.50 | 1.15 | 0.80 | 1.0 | 0.006 | 0.30 | - | % |
| Type | Tensile (PSI (MPA)) | Yield (0.2% offset), (PSI (MPA) Min) | Elongation in 2" or 4D min% | Reduction of Area | Hardness | Charpy Impacts at - 60◦C (-76◦F) J (ft.lb) |
|---|---|---|---|---|---|---|
| API 6ACRA Oil Patch | 150,000 (1034) | 120,000 (827) | 20 | 35 | 40 HRC Max |
76.2mm dia: 61J
(45) min/68J(50)
Average 76.2mm to 254mm dia: 41J(30) min/ 47J (35) average >254mm dia: 37J (27) min/41J (30) average |
| High Strength/ AMS Aerospace | 185,000 (1275) | 150,000 (1034) | 12 | 15 | 331HB Min |
Typical applications in the oil industry and aerospace and power generation industries.
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