Official Answer
Answer
17-7PH (Nau'in 631) shine hazo-hardening bakin karfe wanda ke ba da babban haɗin gwiwa mai ƙarfi da juriya na lalata. A cikin yanayin CH900 (raguwar sanyi da tsufa a $900^{\circ}F$), yana samun ƙarfin ɗaure wanda ya wuce $200$ ksi. Mahimmanci, yana kiyaye modulus ɗin sa na roba $ E$ kuma yana tsayayya da shakatawar danniya a yanayin zafi har zuwa $650 ^{\circ}F$ ($ 343 ^{\circ}C $), yayin da SAE 1070 carbon karfe ya fara rasa ƙarfin ɗaukar nauyinsa da sauri sama da $250 ^{\circ}F $ saboda canje-canjen ƙananan tsarin. Bugu da ƙari, 17-7PH yana da juriya ga haɓakar hydrogen, yanayin gazawar gama gari don maɓuɓɓugan ƙarfe na ƙarfe na ƙarfe.
