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zafi birgima karfe tsiri
Ana yin samfura masu zafi na birgima na ƙarfe na coil ɗin daga slabs (mafi yawan ci gaba da simintin simintin gyare-gyare) azaman albarkatun ƙasa, waɗanda aka yi zafi sannan a sanya su su zama tsiri ta hanyar mirgina raka'a da gamawa.Zafin karfe mai zafi daga injin niƙa na ƙarshe na injin gamawa ana sanyaya shi zuwa saita zafin jiki ta hanyar kwararar laminar kuma ana mirgine shi cikin coils ɗin karfe ta coiler.