Inconel 718 yika igi jẹ igi alloy nickel-chromium pẹlu to 55% nickel ninu akopọ rẹ. Awọn akoonu pẹlu 17% chromium, 4.9% niobium, 6.6% iron kere ati aluminiomu, boron, carbon, cobalt, Ejò, manganese, irawọ owurọ, asiwaju, sulfur ati silikoni. Ohun elo naa ni agbara fifẹ to gaju ti 1375 MPa ati agbara ikore ti o kere ju ti 1100 MPa.