Nws belongs rau cov khoom siv ua ntej rau kev tsim cov khoom siv hlau xws li cov qauv txheem. Lub hom phiaj yog kom dhau cov hlau los yog bar uas tsim los ntawm cov chaw tsim khoom steel thiab thauj mus rau cov khoom siv hlau hlau xws li cov txheej txheem los ntawm cov txheej txheem kos duab ntawm cov hlau kos duab, kom lub cheeb ntawm cov hlau los yog bar tuaj yeem ua qhov roundness, sab hauv metallographic qauv, nto tiav thiab straightness tag nrho raws li raw cov ntaub ntawv uas yuav tsum tau rau zus tau tej cov qauv thiab lwm yam khoom hlau.
Yog li ntawd, qhov zoo ntawm cov hlau los yog bar pretreatment ntawm lub tshuab nqus tsev hlau yog ncaj qha ntsig txog cov khoom zoo ntawm cov qauv thiab lwm yam khoom siv hlau;
Lub tshuab nqus hlau yog nyob rau hauv cov hlau hlau kos duab tshuab hauv kev lag luam hlau khoom. Lub tshuab nqus hlau yog siv dav hauv kev tsim khoom thiab ua ntej ntawm cov khoom siv hlau xws li steel hlau, hlua hlau, prestressed steel hlau, thiab cov qauv txheem.
