Ivyuma vy'ivyuma vy'ivyuma vy'ivyuma vy'ivyuma ni igikoresho c'ivyuma vyinshi gifise ivyuma, chromium na carbone nk'ibice vy'ishimikiro, bifise ubushobozi bwinshi, ubushobozi bwinshi bwo guhangana n'ubushuhe, ubushobozi bwo kwambara bwinshi n'ugushikama kw'imiti, kandi bukoreshwa cane mu guhingura ibice vy'impuzu bikora ku bushuhe bwinshi buri hejuru ya degre 800. Ivyo bihimba vyayo vy’imiti birimwo carbone (2,0%-3,6%), silikoni (1,2%-2,0%), manganesse (0,3%-1,2%), ikibiriti na phosphorus (nta n’imwe irenze 0,05%), na chromium (10%-30%, akenshi 15%-22%) nk’ibintu nyamukuru bitera umubiri. Ikindi, ibintu nka nickel, molybdenum n’umuringa na vyo nyene birashobora kuba birimwo, ariko ku rwego rwo hasi. 12
Ubushuhe bwo kuvura chromium nyinshi buragira ico bukoze cane ku mico yaco. Uburyo busanzwe bwo gusukura ubushuhe burimwo uguhinduranya, gusubiriza, guzimya no gutera, n’ibindi. Mu guhindura ibipimo vy’ubuvuzi bw’ubushuhe, uburemere bwavyo, ubukomezi n’ubushobozi bwo kwambarwa birashobora kwongerwako kugira ngo bishobore gushitsa ivyo bikenewe.
