Ibyuma bisanzwe bifata ibyuma birimo karubone na chromium byatoranijwe kandi bigakomera kugirango bihangane n’umuvuduko mwinshi uri hagati yikizunguruka nimpeta.
Carbonitriding kumpeta yimbere ninyuma ninzira yibanze yo gukomera kubantu benshi batanga imipira ya TPI. Binyuze muri ubu buryo budasanzwe bwo kuvura, ubukana hejuru yumuhanda bwiyongera; bigabanya kwambara.
Ibyuma bisukuye cyane biraboneka muri bimwe mubicuruzwa bya TPI bisanzwe byerekana ibicuruzwa, ubu birashobora kwihanganira kwambara. Kubera ko umunaniro wo guhura akenshi uterwa no gukomera kutari ibyuma, kwifata muri iki gihe bisaba urwego rudasanzwe rwisuku.