Specs: AMS 5754, MIL-I-45208A
Hastelloy X is a Nickel based alloy containing 47.5% Nickel, 22% Chromium and 18.5% Iron, with small amounts of Cobalt, Molybdenum and Tungsten.
This corrosion and heat-resistant alloy is typically used for such parts as turbine rotors, shafts, flanges, blades and bolts, requiring oxidation resistance up to 2200°F and relatively high strength about 1500°F.
Hastelloy X's primary function is to endure effectively under high-temperature, high-stress applications in a moderately to severely corrosive, and/or erosion-prone environment where more common and less expensive iron-based alloys would fail. Although it is a super alloy, Hastelloy X does experience degradation due to fabricating and handling. Electropolishing or passivation of Hastelloy X can improve corrosion resistance.