Ana yin nada mai zafi da katako (mafi yawan ci gaba da simintin simintin gyare-gyare) azaman ɗanyen abu, wanda ake zafi kuma ana yin shi ta hanyar injin niƙa da gamawa.Motsi mai zafi Mai zafi tsiri mai zafi daga injin ƙarewa na ƙarshe ana sanyaya shi zuwa saita zafin jiki ta hanyar kwararar laminar, kuma ana jujjuya coil ɗin karfe ta coiler.Ana sarrafa kwandon karfen da aka sanyaya ta hanyar layukan gamawa daban-daban (mataki, daidaitawa, yankan giciye ko yanke a tsaye, dubawa, aunawa, marufi da alama, da sauransu) gwargwadon bukatun masu amfani daban-daban.
Idan za a iya fassara shi cikin sauƙi, ana dumama guntun billet ɗin (wato, jan ƙarfe da zafi da ake ƙonewa a talabijin) sannan a yi birgima sau da yawa, sannan a gyara shi a gyara shi a cikin farantin karfe, wanda ake kira hot rolling. .
Saboda girman ƙarfinsa, ƙaƙƙarfan ƙarfi, sauƙin sarrafawa da kyakkyawan walƙiya, ana amfani da samfuran farantin karfe mai zafi mai zafi a cikin jiragen ruwa, motoci, gadoji, gini, injina, tasoshin matsa lamba da sauran masana'antu.
Tare da balagaggun sabbin fasahohin sarrafawa irin su daidaiton girman girman, siffar da ingancin farfajiyar zafi mai zafi da kuma zuwan sabbin samfura, samfuran tsiri mai zafi da farantin karfe an ƙara yin amfani da su kuma suna da ƙarfi da ƙarfi a kasuwa.