Cov khoom siv hlau yog cov cuab yeej tseem ceeb hauv kev ua haujlwm hlau thiab tau siv dav hauv ntau qhov kev lag luam xws li metallurgical engineering.
Cov roj hlau feem ntau siv hauv cov mills rolling. Lub hauv paus ntsiab lus ntawm kev tiv thaiv yas ntawm cov hlau yog raws li muaj zog siab thiab kev sib txhuam. Thaum lub sij hawm rolling txheej txheem, cov steel rollers tig ntawm kev kub ceev. Thaum cov hlau billet dhau ntawm cov chais, cov hlau yog nyem thiab plastically deformed nyob rau hauv lub siab ntawm cov rollers. Los ntawm teeb tsa cov menyuam sib txawv ntawm cov menyuam yaus thiab cov menyuam yaus cov khoob, kho kom tswj cov hlau tuab, dav, thiab lwm yam tuaj yeem ua tiav. Piv txwv li, hauv cov steel ntau lawm, cov nplais tuab maj mam dhau los ua cov phaj nyias uas ua tau raws li kev sib txuas ntawm cov yob.
Tus txheej txheem ua hauj lwm ntawm cov rollers steel kuj tseem cuam tshuam cov khoom siv thiab kev kho cua sov ntawm cov menyuam lub cev. Noj cov menyuam roj chromium ua piv txwv, lawv cov qauv cam muaj qhov muaj pes tsawg leeg thiab cov qauv. Tom qab kev kho cua sov xws li quenching, cov khoom xws li hardness, tougness thiab coj tuaj yeem hloov kho tus txheej txheem dov. Thaum cov neeg sib tw hlau thiab rubs tiv thaiv cov hlau uas muaj kev tiv thaiv zoo nkauj thiab hnav zoo ruaj khov rau cov khoom siv tau ruaj khov thiab ua kom cov khoom siv tau ruaj khov.
Tsis tas li ntawd, cov txheej txheem cov kauj ruam ntawm cov micrters steel yog nruj. Xws li txiav, tig, txuas ntxiv, tig cov khoom siv sib npaug, cov kauj ruam ntawm cov khoom siv sib npaug, kom cov steel sib npaug