1. Qhov ntau dhau ntawm deoxidizer txhuas thaum lub sijhawm melting tuaj yeem yooj yim ua cov nitrogen in suav nrog nrog cov nitrogen nyob rau hauv cov hlau, ua rau nkig tawg ntawm cov casting.
2. Kev siv ntau dhau heev ntawm kev tsim kho cov cua sov ua kom muaj zog ua rau kev tsim cov pa roj carbon boron hauv cov hlau.
3. Cov pa roj carbon ntau dhau ntawm cov ntsiab lus thiab lwm cov ntsiab lus sib xws tshaj qhov nplai tseem tuaj yeem ua rau brittleness ntawm cov hlau. Piv txwv li, thaum siv npua hlau rau kev ua pa hluav taws, yog tias ntxiv ntxiv tsis tau ceevfaj lossis suav, cov teeb meem tsis zoo tuaj yeem qhia tau.
4. Cov steel yog ntau heev overheated thiab kev kho cua sov ua haujlwm yog tsis raug, ua rau coarse nplej.