Zomwe zimapangidwa ndi martensitic zosapanga dzimbiri zosapanga dzimbiri zimadziwika ndi kuwonjezera kwa zinthu monga molybdenum, tungsten, vanadium, ndi niobium pamitundu yosiyanasiyana ya 0.1% -1.0% C ndi 12% -27% Kr. Chifukwa kapangidwe kake ndi kapangidwe kake kokhala ndi thupi, mphamvu imatsika kwambiri kutentha kwambiri. Pansi pa 600 ℃, mphamvu yotentha kwambiri ndiyokwera kwambiri pakati pa mitundu yonse yazitsulo zosapanga dzimbiri, ndipo mphamvu yolowerera ndiyopamwamba kwambiri. Chitsulo cha 440A chimatha kuzimitsa bwino ndikuwongolera magwiridwe antchito, kulimba kwambiri, komanso kulimba kwambiri kuposa chitsulo cha 440B ndi chitsulo cha 440C. Chitsulo cha 440B chimagwiritsidwa ntchito popangira zida, kuyeza zida, mayendedwe ndi mavavu. Chitsulo cha 440B chimakhala cholimba kuposa 440A chitsulo komanso kulimba kwambiri kuposa chitsulo cha 440C. Chitsulo cha 440C chimakhala chouma kwambiri pakati pazitsulo zosapanga dzimbiri komanso chitsulo chosagwiritsa ntchito kutentha, ndipo chimagwiritsidwa ntchito popanga mphuno ndi mayendedwe.