Ibikoresho
Ubwoko bwibyuma bikoreshwa mubikorwa ningingo yingenzi mugihe kirekire cyibicuruzwa byanyuma.Ibyuma byujuje ubuziranenge bwo kwihanganira ibyuma bifite imbaraga zo kwihanganira kandi biramba bizatoranywa, harimo 40Cr, 20CrMn, ibyuma bitagira umwanda, nibindi.