Inconel 625 is a nickel-chromium-molybdenum alloy with an addition of niobium that acts with the molybdenum to stiffen the alloy’s matrix and thereby provide high strength without a strengthening heat treatment. The alloy resists a wide range of severely corrosive environments and is especially resistant to pitting and crevice corrosion. Used in chemical processing, aerospace and marine engineering, pollution-control equipment, and nuclear reactors.

Typical Analysis in Percent:

              Ni                        58 min                 Cr                    20 - 23

              Fe                          5                       Co                        1

              Mo                       8 - 10               Nb(+Ta)             3.15 - 4.15

              Ti                           .4                      Al                        .4

              C                           .1                      Mn                       .5

              Si                           .5

Physical Properties:

Density: 8.44 g/cm³ 

Melting Point/Range: 1290 - 1350 ^oC (2350 - 2460 ^oF)

                                                                                      J/kg ⋅ K                    Btu/lb ⋅ ^oF 

Specific Heat:                                                                  410                             0.098

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

Average Coefficient of Thermal Expansion:                    12.8                           7.1

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

Thermal Conductivity:                                                      9.8                           68

Electrical Resistivity: 1290 nΩ ⋅ m

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

               930            135            517          75                     42.5                     207            30

Hardness: 190 HB