Madaidaicin kabu karfe billet huda zafin jiki dabam bisa ga albarkatun kasa m m.Thermal fadada bututu amma mafi yawa a cikin 1200 ℃, lokacin da carbon abun ciki da sauran alloying abubuwa more zafin jiki dan kadan kasa.

Makullin na biyu shine ƙoƙarin rage yawan ma'aunin aikin dumama.Musamman a cikin gwiwar hannu mai zafi, 16Mn madaidaiciyar bututun karfe na kabu daga barin tsammanin rayuwa da ingancin ingancin bututu, yana roƙon ma fi tsanani.A 16Mn madaidaiciya kabu karfe bututu samar tsari, tun da farko tsari ne a cikin wani zafi jihar, don haka dumama aiki ne ƙuduri samfurin ingancin da muhimmanci sosai tsari.

Zafi tare da tanderun, bisa ga sakamakon su, da kuma reheating tanderu ya kasu kashi biyu;ana amfani da tsohon don billet mai zafi daga zafin jiki zuwa zafin jiki;Ana amfani da na ƙarshe a cikin tsari a cikin ɓoyayyen da aka mayar da shi zuwa yanayin da ake buƙata.Dumama zai zama ba daidai ba a cikin farfajiyar waje na bututu na iya nuna fashewa, folds da ciwon kai da sauran dalilai na sharar gida.Furnace Akwai hanyoyi da yawa, amma amfani da farko shine tanderun zobe.Wannan tanderun yana da murhu na annular, yana iya sannu a hankali canza shugabanci na diamita na blank tare da kasan kaya daga ƙofar, ana iya amfani da juzu'i a mashigin dumama da zafin jiki mai zafi zuwa tsarin irin murhu.Wannan aiki shine maɓalli na blank ana dumama shi iri ɗaya zuwa yanayin zafi da ya dace da sarrafawa.Saboda babban tasiri akan ingancin huda, wato, lokacin da zafin jiki na huda tsari shine muhimmin yanayin da ke shafar ingancin, gabaɗaya yanayin zafin billet ɗin yana aiki shine sarrafa shi.