Insimbi ye-alloy - Ngokwesisekelo se-carbon steel evamile, ukuze kuthuthukiswe ukusebenza kwensimbi, i-alloying element eyodwa noma ngaphezulu yengezwe ngamabomu ensimbi ngesikhathi sokuncibilika. Ngokusho kwezakhi ezahlukene ezingeziwe, futhi uthathe ubuchwepheshe obufanele bokucutshungulwa, ungenza insimbi ithole izakhiwo eziphakeme zemishini, ukuqina, ukuzinza, amandla.