1.Icyuma cy'ibikoresho ni ubwoko bw'icyuma kivanze cyagenewe gukoreshwa mubikoresho bitandukanye nibikoresho bikoreshwa.Ibigize byateguwe kugirango bitange uruvange rwimbaraga, imbaraga, no kwambara birwanya.Ibyuma bikoreshwa mubikoresho birimo karubone nyinshi (0.5% kugeza 1.5%) nibindi bintu bivanga nka chromium, tungsten, molybdenum, vanadium, na manganese.Ukurikije porogaramu, ibyuma byabikoresho bishobora kandi kuba birimo ibindi bintu bitandukanye, nka nikel, cobalt, na silicon.
2.Ihuriro ryihariye ryibintu bikoreshwa mugukora ibyuma byigikoresho bizatandukana bitewe nibintu byifuzwa hamwe nibisabwa.Ibyuma bikoreshwa cyane bikoreshwa mu byiciro nk'ibyuma byihuta cyane, ibyuma bikora imirimo ikonje, ndetse n'ibyuma bishyushye. ”