ATI 720 Alloy is a high-strength, precipitation-hardening, nickel-base alloy that was originally developed as an industrial gas turbine blade alloy. Later, this alloy was used for aircraft engine disks and blades. The alloy is solid solution strengthened by additions of chromium, cobalt, molybdenum and tungsten, while additions of titanium and aluminum provide precipitation strengthening by gamma (Ni3Ti,Al). The high gamma solvus temperature allows thermomechanical processing to develop very fine grain sizes that can result in superplastic properties. ATI 720 alloy has good oxidation resistance, as well as excellent resistance to sulfide corrosion. It is manufactured by Vacuum Induction Melting (VIM) followed by Vacuum Arc Remelting (VAR), or by triple melting which includes an Electroslag Remelting (ESR) step between the VIM and VAR operations.