Ibyuma bitagira umuyonga ni itsinda ryama ferrous irimo byibura chromium igera kuri 11%, ibice birinda icyuma kubora kandi ikanatanga ibintu birwanya ubushyuhe.Ubwoko butandukanye bwibyuma bidafite umwanda birimo ibintu bya karubone (kuva 0,03% kugeza hejuru ya 1.00%), azote, aluminium, silikoni, sulfure, titanium, nikel, umuringa, selenium, niobium, na molybdenum.Ubwoko bwihariye bwibyuma bitagira umwanda bikunze kugenwa na AISI yabo nimibare itatu, urugero, 304.