Ana rage adadin ƙwayoyin kristal lokacin da eutectic crystallization na simintin ƙarfe ya narke a cikin tanderun narkewa.

A cikin narkewar cupola, lokacin daga narkewar cajin zuwa fitar da narkakken ƙarfe daga cikin tanderun gajere ne, kusan mintuna 10. Lokacin narkewa a cikin wani injin wutar lantarki, yana ɗaukar akalla sa’a 1 daga farkon cajin zuwa bugun ƙarfe, kuma yana da tasirin motsa jiki na musamman na dumama shigar da shi, wanda ya rage yawan kayan da ke cikin narkakken ƙarfe wanda za’a iya amfani dashi azaman tsakiya na waje na graphite. a lokacin eutectic crystallization. . Misali, SiO2, wanda za’a iya amfani dashi azaman tsakiya na kristal na waje, yana iya sauƙin amsawa tare da carbon a cikin simintin ƙarfe kuma ya ɓace lokacin da zafin jiki ya yi girma sosai kuma akwai tasirin motsa jiki:

SiO2＋O2→Si＋2CO↑

Don haka, lokacin da ake narkewar baƙin ƙarfe mai launin toka a cikin tanderun narkewa, ya kamata a ba da kulawa ta musamman ga maganin rigakafi. Adadin inoculant ya kamata ya zama dan kadan fiye da na cikin narkewar cupola. Zai fi kyau a yi pre-cubation (pre-inoculation) a cikin tanderun kafin a fitar da shi. Don inganta yanayin nucleation na simintin ƙarfe eutectic crystallization.