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.
Alloy 625 is used for its high strength, excellent fabricability (including
joining), and outstanding corrosion resistance.