Ibyuma bitagira umwanda nicyuma gito cya karubone irimo chromium kuri 10% cyangwa irenga kuburemere. Nukwiyongera kwa chromium itanga ibyuma byihariye bidasanzwe, bitangirika kwangirika.
Niba byangiritse muburyo bwa chimique cyangwa chimique, iyi firime irikiza, mugihe ogisijeni, niyo yaba ari mike cyane. Kurwanya ruswa nibindi bintu byingirakamaro byibyuma byongerewe imbaraga muri chromium yiyongereye no kongeramo ibindi bintu nka molybdenum, nikel na azote. Hano hari amanota arenga 60 yicyuma.
Inyungu nyinshi zicyuma kitagira umwanda: Kurwanya ruswa, Kurwanya umuriro nubushyuhe, Isuku, Kugaragara kwiza, Imbaraga-Kuri-Ibiro, Kuborohereza Ibihimbano, Kurwanya Ingaruka, Agaciro Kigihe kirekire, 100%.
Dore ibicuruzwa byacu bidafite ingese:
Igihe cyo kohereza: Kanama-17-2020