Inconel 718 is a precipitation-hardenable nickel-chromium alloy containing significant amounts of iron, niobium, and molybdenum along with lesser amounts of aluminum and titanium. It combines corrosion resistance and high strength with outstanding weldability, including resistance to postweld cracking. The alloy has excellent creep-rupture strength at temperatures up to 700 ^oC (1300 ^oF). Used in gas turbines, rocket motors, spacecraft, nuclear reactors, pumps, and tooling.

Typical Analysis in Percent:

              Ni(+Co):             50 - 55                      Cr:               17 - 21

              Fe:                       bal                         Co:                  1

              Mo:                   2.8 - 3.3                  Nb(+Ta):      4.75 - 5.5

              Ti:                    .65 - 1.15                    Al:               .2 -.8

              C:                       .08                           Mn:               .35

              Si:                      .35                            B:                .006

              Cu:                      .3

Physical Properties:

Density: 8.19 g/cm³ 

Melting Point/Range: 1260 - 1336 ^oC (2300 - 2437 ^oF)

                                                                        J/kg ⋅ K                    Btu/lb ⋅ ^oF 

Specific Heat:                                                     435                            0.104

                                                                        µm/m ⋅ K                  µin./in. ⋅ ^oF 

Average Coefficient of Thermal Expansion:     13.0                          7.2

                                                                        W/m ⋅ K             Btu ⋅ in./ft² ⋅ h ⋅ ^oF 

Thermal Conductivity:                                        11.4                          79

Electrical Resistivity: 1250 nΩ ⋅ m 

Curie Temperature: -112 ^oC (-170 ^oF)

Typical Mechanical Properties:

At Room Temperature:

        Ultimate Tensile         Yield Strength        Elongation in         Elastic Modulus

            Strength                  (0.2 % offset)          50 mm (2")              (Tension)

             MPa           ksi              MPa        ksi                  %                    GPa        10⁶ psi

            1240           180             1036         150                 12                      211        30.6

Hardness: 36 HRC