Answer
17-7PH (Yanayin CH900) an fi so a cikin sararin samaniya saboda ƙaƙƙarfan ƙarfinsa-zuwa-nauyi da juriya na lalata. Ba kamar SAE 1070 carbon karfe ba, wanda ke buƙatar kashe mai da fushi (RC 40-52), 17-7PH yana da taurin aiki (Sharadi C) sannan hazo-taurare a $900^{\circ}F$ ($ 482 ^{\circ}C$) na awa ɗaya. Wannan tsari yana haifar da ƙarfin ƙarfi mai ƙarfi (har zuwa 240 ksi) da kyakkyawan juriya na gajiya. Don aikace-aikacen da suka shafi yanayin zafi har zuwa $650 ^{\circ}F$, 17-7PH yana kula da modules ɗin sa na roba $E$ fiye da carbon karfe, wanda ya fara rasa amincin tsarin kuma yana fama da rarrafe sama da $250^{\circ}F$. Bugu da ƙari, 17-7PH yana da juriya ga haɓakar hydrogen, yanayin gazawar gama gari don maɓuɓɓugan ƙarfe na ƙarfe na ƙarfe.
