Alloy X or Inconel® HX is a nickel-chromium-iron-molybdenum alloy with outstanding strength and oxidation resistance at temperatures to 1200°C. Matrix stiffening provided by the molybdenum content results in high strength in a solid-solution alloy having good fabrication characteristics. The alloy is used in gas turbines, industrial furnaces, heat-treating equipment and nuclear engineering. Recommended filler metal for welding is Inco Weld® HX.