Answer
A yanayin zafi na aiki na $ 350 ^ ∘C $, 17-7PH bakin karfe ya fara wahala daga tsufa da kuma raguwa mai yawa a cikin ƙarfin yawan amfanin ƙasa, yana haifar da shakatawa na damuwa (creep). Inconel X-750 (AMS 5699) shine mafi kyawun zaɓi don O&G na karkashin teku saboda keɓancewar juriyar sa ga chloride-induced stress corrosion crack (SCC) da kwanciyar hankali mai zafi. X-750 yana fama da hazo ta hanyar samar da lokaci $\gamma'$ ($ Ni_3(Al, Ti)$), wanda ke kula da kayan aikin sa har zuwa $700^∘C$. Dole ne a kula da bazarar zafi zuwa zafin No.1 (HT) don haɓaka juriya na shakatawa. Bugu da ƙari, ƙananan modulus na X-750 ($ E \ kimanin 213$ GPa) idan aka kwatanta da 17-7PH ($ E \ kusan 200$ GPa a temp) yana buƙatar ɗan daidaitawa a cikin adadin juyi don kiyaye halaye iri ɗaya.
