Soo saarista Birta Ductile (sidoo kale loo yaqaan Ductile Iron), isticmaalka karburiyeyaasha tayada sare leh ayaa muhiim u ah gaaritaanka sifooyinka la doonayo ee alaabta dhamaadka.Recarburizer caadi ahaan la isticmaalo waagraphite petroleum coke (GPC), kaas oo laga sameeyay batroolka kookaha iyada oo loo marayo habka kuleylka heerkulka sare.

Marka la dooranayo dib-u-carburis ee soo saarista birta ductile, dhowr arrimood waa in la tixgeliyaa.Waxa ugu daran ee arrimahan ka mid ah waa kaarboonka go'an, maadada baaruudda, ka kooban dambaska, maadada kacsan, ka kooban nitrogen iyo ka kooban hydrogen.

Waxa ku jira kaarboonka go'an waa boqolkiiba kaarboonka ku hadha garaafiga batroolka kookaha ka dib marka dhammaan isbeddellada iyo dambaska la gubo.Mar kasta oo kaarboonka go'an ee ka kooban yahay uu sareeyo, kaarboon-buriyaha ayaa si wanaagsan u kordhinaya kaarboonka ku jira birta dhalaalaysa.graphite petroleum coke oo leh kaarboon go'an oo ah ugu yaraan 98% ayaa lagula talinayaa soo saarista birta ductile.

Sulfur waa wasakh caadi ah oo ku jirta graphite petroleum coke iyo joogitaankiisu si xun ayuu u saameeyaa sifooyinka ugu dambeeya ee birta ductile.Sidaa darteed, waxaa muhiim ah in la doorto kookaha batroolka graphite oo leh maaddo baaruud ah oo hooseeya (sida caadiga ah wax ka yar 1%).

Waxa ku jira dambasku waa cadadka walxaha aan guban ee ku jira kookaha batroolka ee graphite.Maaddooyinka dambaska sarreeya waxay abuurtaa foornada foornada, taas oo kordhisa kharashka waxayna yaraynaysaa waxtarka.Tani waa sababta lagu taliyay in la isticmaalo kookaha batroolka graphite oo leh dambaska ka hooseeya 0.5%.

Walaxda kacsan waxa ka mid ah gaas kasta ama dareere kasta oo la sii daayo marka garaafiga batroolka kookaha la kululeeyo.Mawduucyada isbeddelaya ee sarreeya waxay soo jeedinayaan in kookaha batroolka ee graphite uu sii deyn karo gaasyo badan, kaas oo abuuri kara porosity alaabta ugu dambeysa.Markaa, kookaha batroolka graphite oo leh walxo aan kacsanayn oo ka yar 1.5% waa in la isticmaalo.

Maadada Nitrojiinku waa wasakh kale oo ku jirta kookaha batroolka graphite ee ay tahay in hoos loo dhigo sababtoo ah waxay saameyn kartaa sifooyinka farsamada ee birta kabka nodular.graphite petroleum coke oo leh wax ka yar 1.5% nitrogen ayaa ku habboon wax soo saarka birta kabka ee nodular.

Ugu dambeyntii, waxa ku jira hydrogen waa arrin kale oo ay tahay in la tixgeliyo marka la dooranayo kicinta kaarboon ee soo saarista birta kabka ee nodular.Heerarka hydrogen-ka sare waxay u horseedi karaan jajabnaanta korodhka iyo hoos u dhaca ductility.graphite petroleum coke ka kooban hydrogen ka yar 0.5% ayaa la door bidayaa.

Marka la soo koobo, wax soo saarka birta nodular-ka ah waxay u baahan tahay kor u qaada kaarboon tayo sare leh oo buuxiya shuruudaha gaarka ah ee ka kooban kaarboonka go'an, ka kooban baaruud, ka kooban dambaska, walxaha kacsan, ka kooban nitrogen, iyo ka kooban hydrogen.Isticmaalka kookaha batroolka graphite ee buuxiya shuruudahan ayaa hubin doona soo saarista birta kabka nodular tayo sare leh, oo sidoo kale loo yaqaan Ductil Iron ama SG iron.