Inconel 718 ina kimsingi ya nickel (52%). Vitu vya kujumuisha ni pamoja na chuma (19%), chromium (18%), niobium + tantalum (5%), molybdenum (3%), titanium (0.9%), aluminium (0.5%), kwa kuongeza vitu vingine vya kuwafuata kama Baron, Cobalt, Copper, Manganese na Silicon.