IN718
IN718 is a nickel base precipitation hardening equiaxed superalloy. Alloy to‘ γ’ Phase is the main strengthening phase‘ γ’ The phase is auxiliary strengthening phase.
Equivalent Grades
| Trademark | GB | GOST | ASTM | UNS | DIN | W.Nr. | NF | BS | JIS | SS |
| – | K4169 | – | IN718 | – | – | – | – | – | – | – |
Chemical Composition, %
| Alloy | C | Si | Mn | P | S | Cr | Ni | Co | Mo | Al | Ti | Nb | Ta | Fe |
| IN718 | 0.02-0.08 | ≤0.35 | ≤0.35 | ≤0.015 | ≤0.015 | 17.0-21.0 | 50.0-55.0 | ≤1.0 | 2.8-3.3 | 0.3-0.7 | 0.65-1.15 | 4.4-5.4 | ≤0.10 | Bal |
Typical Physical and Mechanical Properties (RT, Solution Annealed)
| Density, g/cm3 | Melting Point, ℃ | Tensile Strength, MPa | Yield Strength, MPa | ELongation, % | Hardness, HRB |
| 8.22 | 1243-1359 | 1035 | 890 | 15 | / |
Available Products and Specifications
| Rod, Bar, Wire and Forgings | – |
| Plate, Sheet and Strip | – |
| Pipe and Tube | – |
| Welding Product | – |
| Others | – |
Features
The alloy has high strength and plasticity in a wide medium and low temperature range of – 253-700℃, excellent corrosion and radiation resistance, good welding and forming properties, and good resistance to strain aging cracks.
Applications
The alloy is widely used in aviation, aerospace engines, nuclear reactors and chemical fields. It is suitable for making engine blades, blade casings and other structural parts working below 650℃.
