Official Answer
Answer
Karfe zoben yawanci ana yin su ne daga karfen carbon da aka yi birgima mai sanyi. Ƙarfin 'ƙuƙwalwa', wanda ke ajiye zoben a zaune a cikin tsagi, aiki ne na tashin hankali da aka shigar da zoben. Idan zoben yana da zafi sosai (ya yi laushi sosai), za a yi masa nakasar filastik yayin shigarwa, yana rasa 'ƙwaƙwalwar'sa kuma ya kasa mannewa sosai. Idan ba shi da ƙarfi (da wuya sosai), ya zama mai karye kuma yana iya tsage yayin faɗaɗa da ake buƙata don zame shi a kan sanda. Maƙasudin taurin shine yawanci 45-52 HRC. Wannan ma'auni yana tabbatar da cewa zoben zai iya faɗaɗa da $10-15 \%$ na diamita yayin shigarwa kuma ya dawo zuwa girmansa na asali don daidaitawa.
