Ua ib lub tshuab nqus tsev uas siv dav hauv kev tsim cov hlau zoo, nws muaj cov teebmeem degassing thiab deoxidizing zoo heev. Nws ua tiav kev tshem tawm hydrogen thiab nitrogen ntawm cov hlau los ntawm kev tsim kom muaj ib puag ncig nqus tsev heev, uas txo cov pa phem hauv cov hlau tiav, uas yog qhov tseem ceeb rau kev txhim kho qhov tawv thiab ductility ntawm cov hlau. Cov txheej txheem no tsis yog tsuas yog txhim kho qhov zoo ntawm cov hlau xwb, tab sis kuj ua rau nws lub neej ua haujlwm ntev dua, uas yog qhov tseem ceeb tshwj xeeb hauv kev tsim cov khoom hlau tshwj xeeb uas xav tau kev huv siab thiab kev ua haujlwm siab.

Lub cub tawg VD ua kom cov hlau hydrogen thiab nitrogen tsawg dua, tshem tawm cov pa oxygen ntawm cov hlau los ntawm cov pa roj carbon thiab oxygen, thiab desulfurizes cov hlau los ntawm kev ua kom cov alkaline top slag nrog cov hlau molten tag nrho, ntxiv rau kev sib xyaw cov khoom sib xyaw thiab qhov kub. Nrog nws cov kev ua tau zoo heev hauv kev degassing, deoxygenation, desulfurization, cov khoom sib xyaw thiab qhov kub sib xyaw, lub cub tawg VD tau dhau los ua cov khoom siv thev naus laus zis tseem ceeb hauv kev lag luam hlau niaj hnub los txhim kho cov khoom zoo, ua kom zoo dua cov txheej txheem ntau lawm, thiab ua tau raws li qhov xav tau ntawm kev lag luam khoom siv siab.