Icyuma gikozwe mu cyuma gishyushye ni cyiza cyane ku bikoresho bya valve, kuko gifite akamaro kanini. Mu gusimbura icyuma, icyuma gishyushye cyakozwe mu 1949. Ingano ya karuboni mu cyuma gishyushye iri munsi ya 0.3%, mu gihe iy'icyuma gishyushye n'icyuma gishyushye ari nibura 3%. Ingano nto ya karuboni mu cyuma gishyushye ituma karuboni iboneka nka grafiti yigenga idakora uduce duto. Imiterere karemano ya karuboni mu cyuma gishyushye ni uduce duto twa grafiti yigenga. Mu cyuma gishyushye, grafiti iri mu ishusho y'uduce duto aho kuba uduce duto nk'uko bimeze mu cyuma gishyushye. Ugereranyije n'icyuma gishyushye n'icyuma gishyushye, icyuma gishyushye gifite imiterere myiza. Uduce duto ni two tubuza irema ry'imiturire, bityo bigatuma icyuma gishyushye gitera izina ryacyo. Ariko, uduce duto mu cyuma gishyushye bituma icyuma kitagira uduce duto. Uduce twiza dushobora kuboneka hakoreshejwe ferrite matrix.

Ugereranyije n'icyuma gishongeshejwe, icyuma gishongeshejwe gifite inyungu zidasanzwe mu mbaraga. Ingufu zo gukurura icyuma gishongeshejwe ni 60k, mu gihe iz'icyuma gishongeshejwe ari 31k gusa. Ingufu zo gukurura icyuma gishongeshejwe ni 40k, ariko icyuma gishongeshejwe ntikigaragaza imbaraga zo gukurura kandi amaherezo kizacika.

Ingufu z'icyuma gikozwe mu buryo bwa ductile zigereranywa n'iz'icyuma gikozwe mu buryo bwa ductile. Ingufu zikozwe mu buryo bwa ductile zifite imbaraga nyinshi mu gutanga umusaruro. Ingufu nke cyane z'icyuma gikozwe mu buryo bwa ductile ni 40k, mu gihe imbaraga z'icyuma gikozwe mu buryo bwa ductile ari 36k gusa. Mu bikorwa byinshi by'umujyi, nko mu mazi, amazi y'umunyu, umwuka, kurwanya ingese no kurwanya ogisijeni by'icyuma gikozwe mu buryo bwa ductile biruta iby'icyuma gikozwe mu buryo bwa ductile. Ingufu zikozwe mu buryo bwa ductile zizwi kandi nka spheroidal graphite iron. Kubera imiterere ya graphite ikozwe mu buryo bwa spheroidal, icyuma gikozwe mu buryo bwa ductile kiruta icyuma gikozwe mu buryo bwa ductile mu gutuma amazi ahindagurika, bityo bikaba byiza mu kugabanya umuvuduko. Impamvu y'ingenzi yo guhitamo icyuma gikozwe mu buryo bwa ductile nk'igikoresho cy'ingufu ni uko gifite igiciro gito ugereranyije n'icyuma gikozwe mu buryo bwa ductile. Ikiguzi gito cy'icyuma gikozwe mu buryo bwa ductile gituma iki gikoresho gikundwa cyane. Uretse ibyo, guhitamo icyuma gikozwe mu buryo bwa ductile bishobora kugabanya ikiguzi cyo gukora.