Insimbi yensimbi ye-alloy iwuhlobo lwensimbi olungeza i-chromium, i-molybdenum, i-tungsten, i-vanadium nezinye izakhi ze-alloy ensimbi yensimbi ye-carbon ukuze kuthuthukiswe ukuqina, ukuqina, ukumelana nokugqokwa nokumelana nokushisa. Isetshenziswa kakhulu ukwenza amathuluzi okulinganisa, amathuluzi okusika, amathuluzi amelana nomthelela, isikhunta esibandayo nesishisayo, namanye amathuluzi enhloso ekhethekile.