Tha Inconel 718 air a dhèanamh suas sa mhòr-chuid de nicil (52%). Tha eileamaidean alloying a’ toirt a-steach iarann (19%), cromium (18%), niobium + tantalum (5%), molybdenum (3%), titanium (0.9%), alùmanum (0.5%), a bharrachd air eileamaidean lorg eile leithid Baron , Cobalt, Copar, Manganese agus Silicon.