Galvanized karfe farantin ne welded karfe farantin tare da zafi-tsoma ko electro galvanized shafi a saman, wanda aka kullum amfani a yi, iyali kayan, motoci da jiragen ruwa, ganga masana'antu, electromechanical masana'antu, da dai sauransu.
Ci gaban samar da iskar zafi mai zafi a kasar Sin ya kasance a baya.Daga 1950s zuwa 1960s, 13 juyi zafi-tsoma galvanizing raka'a don guda sheet karfe faranti da aka jere gina, tare da damar 100000 t / A. Duk da haka, saboda lahani na low fitarwa, high cost, matalauta quality, muhalli gurbatawa, matalauta. fa'idojin tattalin arziki da sauransu, an dakatar da su kuma an canza su zuwa samarwa.Tun daga karshen shekarun 1970, kasar Sin ta fara gina manyan na'urori masu dumama ruwan zafi.