DIN EN877 Gutera Imiyoboro hamwe nicyuma, Serivise yumukara wicyuma, Uruganda rwumwimerere
EN877 Shira ibyuma
Icyuma gisa nicyuma bivuga icyuma hamwe na flake grafite, bita icyuma cyumukara kuko kuvunika kwijimye kwijimye iyo kumenetse. Ibice nyamukuru ni ibyuma, karubone, silikoni, manganese, sulfure, na fosifore. Nibikoresho bikoreshwa cyane mubyuma kandi ibisohoka bingana na 80% byumusaruro wibyuma byose. Icyuma gisize icyuma gifite imiterere myiza yo gukata no gukata no kurwanya kwambara neza. Ikoreshwa mugukora ibisakoshi, akabati, nibindi. ibyuma bikozwe mucyuma biri munsi yizindi ibyuma. Ariko ifite ibinyeganyega byiza cyane, ibyiyumvo byo hasi, kandi birwanya kwambara cyane.
Icyuma gisa nicyuma gifite karubone nyinshi (2,7% kugeza 4.0%), ishobora gufatwa nka matrix yicyuma cya karubone hiyongereyeho flake grafite. Ukurikije imiterere ya matrix itandukanye, icyuma cyumukara kigabanyijemo ibyiciro bitatu: ferrite matrix gray gray cast; pearlite-ferrite matrix ibara ryicyuma; pearlite matrix ibara ryicyuma
Kugeza ubu, ibicuruzwa byacu byumuhondo byuma byibanze cyane cyane byuma byamazi.
