Official Answer
Answer
A $400 ^{\circ}F$, SAE 1070 carbon karfe ya fara rasa fushinsa kuma zai sami babban shakatawa (asarar 'ƙarfi') akan lokaci. Wannan na iya sa zoben ya zama sako-sako a cikin tsagi, yana haifar da girgizawa da lalacewa. Sabanin haka, 17-7PH (Sharadi na CH900) ya tsaya har zuwa $650^{\circ}F$. Hazo-taurara microstructure na 17-7PH yana hana motsin ɓarna da ke hade da raƙuman zafi a waɗannan yanayin zafi. Don haka, ga kowane inji ko aikace-aikacen da ke kusa da shaye-shaye inda yanayin zafi ya wuce $350^{\circ}F$, 17-7PH shine zaɓi na wajibi don tabbatar da zoben ya kiyaye amincin injinsa kuma ya zauna.
