Ibyuma

Icyuma ni icyuma. Numuti wibintu ibyuma na karubone. Mubisanzwe birimo munsi ya 2% ya karubone, kandi irashobora kugira manganese nibindi bintu. Ibyuma byibanze byibanze ni chromium. Ifite chromium iri hagati ya 12 na 30% kandi irashobora kuba irimo nikel. Ibyuma bitagira umuyonga bikoreshwa mu gukora ibintu byinshi, nk'ibikoresho, ibikoresho, ibikoresho by'imodoka, imitako na resitora n'ibikoresho by'ibitaro.