Answer
Ana amfani da 17-7PH a cikin yanayin zafi na farko guda biyu don zoben karkace. Yanayi CH900 ya haɗa da mirgina kayan sanyi zuwa babban ƙarfi (Sharadi C) sannan taurin shekaru. Wannan yana haifar da mafi girman yuwuwar ƙarfin ɗaure ($240 ksi$) amma ƙananan ductility. RH950 ya haɗa da maganin maganin, sannan canjin juzu'i ya biyo baya zuwa martensite sannan kuma tsufa a $950^\circ F$. RH950 yana ba da kwanciyar hankali mafi girma da ƙarfi mafi girma, kodayake ɗan ƙaramin ƙarfi fiye da CH900. Don yawancin aikace-aikacen zobe na karkace, CH900 shine ma'auni saboda tsarin murɗawa yana fa'ida daga babban ƙarfin farko na waya mai birgima. Koyaya, don manyan zoben diamita inda shigarwa yana buƙatar haɓakawa mai mahimmanci ba tare da ɗaukar hoto ba, ana iya fifita ƙara ƙarfi na RH950 don hana karaya.
