Zund ruwa Z31 an yi shi da ƙwaƙƙwaran ƙarfe tungsten foda. Tungsten karfe (hard gami) yana da jerin kyawawan kaddarorin irin su babban taurin, sa juriya, ƙarfi da tauri, juriya mai zafi da juriya na lalata, musamman ma girman taurinsa da juriya. Ana amfani da Carbide ko'ina azaman kayan aiki, kamar kayan aikin juyawa, masu yankan niƙa, masu tsara shirye-shirye, ƙwanƙwasa, kayan aikin ban sha'awa, da sauransu, Gudun yankan sabbin carbides ciminti yanzu sau ɗari fiye da na carbon karfe.