Gabatarwar samfuri

Maganin dumama da kashe zafi na bututun ƙarfe hanya ce ta saurin magance zafi. Idan aka kwatanta da maganin dumama na harshen wuta na yau da kullun, yana da fa'idodi da yawa: tsarin ƙarfe yana da ƙananan hatsi; dumama da sauri zuwa zafin austenitic kafin kashewa yana samar da tsarin martensite mai kyau sosai, kuma yayin kashewa, ana samar da tsarin ferrite-pearlite mai kyau. Saboda ɗan gajeren lokacin kashewa na dumama, ƙananan ƙwayoyin carbide suna taruwa kuma suna yaɗuwa daidai gwargwado a cikin matrix na martensite mai kyau. Wannan tsarin yana da fa'ida musamman ga casings masu jure tsatsa.