Tsarin karfewani tsari ne da ya ƙunshi kayan ƙarfe, wanda shine ɗayan manyan nau'ikan ginin gini. Tsarin ya ƙunshi katako, ginshiƙan ƙarfe, ƙwanƙolin ƙarfe da sauran abubuwan da aka yi da ƙarfe na ƙarfe da faranti na ƙarfe. Yana ɗaukar silanization, tsarkakakken manganese phosphating, wankewa da bushewa, galvanizing da sauran hanyoyin kawar da tsatsa da tsatsa. Abubuwan da aka haɗa ko sassa galibi ana haɗa su ta hanyar walda, kusoshi ko rivets. Saboda nauyinsa mai sauƙi da sauƙin gina shi, ana amfani da shi sosai a manyan gine-ginen masana'anta, filayen wasa, da kuma manyan wurare masu tsayi. Tsarin ƙarfe yana da sauƙin lalata. Gabaɗaya, tsarin ƙarfe yana buƙatar ɓatacce, sanya galvanized ko fenti, kuma a kiyaye shi akai-akai.