Nyob rau hauv kub- dov steel ntau lawm thiab vuam txheej txheem, hlau oxide nplai yog cov khoom siv ntau tshaj plaws. Nws nrog rau tag nrho cov txheej txheem ntawm steel ntau lawm, los ntawm cua sov thiab ntxhib dov kom tiav dov, ncaj qha cuam tshuam rau cov tsos zoo ntawm cov hlau thiab tom qab vuam cov txiaj ntsig. Ntau tus kws tshaj lij vuam cuam tshuam nrog nws txhua hnub, tseem yuav tsis tuaj yeem paub qhov txawv ntawm qhov ua rau, cov ntaub ntawv, thiab kev phom sij ntawm ntau hom hlau oxide nplai. Raws li cov theem tsim thiab cov yam ntxwv ntawm cov khoom siv, steel nto hlau oxide nplai feem ntau muab faib ua plaub pawg: thawj hlau oxide nplai, theem nrab hlau oxide nplai, tertiary hlau oxide nplai, thiab liab hlau oxide nplai. Cov no yuav tau piav qhia hauv qab no.
Primary Iron Oxide Scale: Ua ntej kub dov, steel feem ntau rhuab thiab tuav ntawm 1100℃~ 1300 degree. Thaum qhov kub thiab txias no, cov hlau saum npoo tau txais cov tshuaj tiv thaiv oxidation thaum muaj kev sib cuag nrog lub siab - qhov kub thiab txias cua sov cua sov, tsim ib tug 1 ~ 3 hli tuab thawj scale, uas yog tseem tshwm sim los ntawm tsis txaus sab siab thaum lub sij hawm ntxhib dov thiab tsis tiav descaling. Qhov txheej txheem tseem ceeb no tseem hu ua thawj hlau oxide nplai. Cov txheej txheem tseem ceeb muaj cov kab noj hniav loj thiab yog greyish - txheej txheej dub, npog cov phaj hlau hauv daim ntawv flake. Lub nplai txheej yog tsim los ntawm magnetite (Fe3O4).
Secondary hlau oxide nplai: Tom qab kub- dov steel billets tawm ntawm lub cub tawg, lawv tau txais kev kub siab - kev kho dej siab kom tshem tawm cov nplais loj, ua rau cov hlau oxide nplai los tshem tawm ua ntej rough rolling. Thaum lub sij hawm luv luv rolling txheej txheem, lub billet nto tuaj rau hauv kev sib cuag nrog dej thiab huab cua, ua rau theem nrab, kuj hu ua thawj hlau oxide nplai. Vim yog txoj kab rov tav dov, qhov ntsuas thib ob yog thinner, thiab kev ntxhov siab cuam tshuam ntawm cov pob zeb thiab cov nplai yog qhov tsawg, ua rau cov khoom tsis zoo. Yog tias qhov siab - lub dav hlau dej siab tsis tuaj yeem tshem tawm cov nplai thib ob, tawm hauv cov khoom seem ntawm cov phaj hlau thaum lub sijhawm ua tiav, cov khoom tsis zoo yuav tshwm sim ntawm cov khoom. Secondary hlau oxide nplai yog ib txheej reddish, tshwm raws li nyias ib daim hlab ntev, indented, thiab faib nyob rau hauv bands raws li dov kev taw qhia. Lub nplai txheej yog tsim los ntawm cov khoom xws li ferroalloy (FeO) thiab hematite (Fe2O3).
Tertiary hlau oxide nplai: Thaum lub sij hawm kub - dov tiav dov txheej txheem, ib txheej hlau oxide nplai txheej yog tsim tawm thaum lub sawb nkag mus rau txhua lub zeb sawv. Tom qab dov, hlau oxide nplai yuav raug tsim dua thaum lub sij hawm zaum kawg descaling los yog nruab nrab ntawm zeb sawv. Yog li ntawd, cov txheej txheem saum npoo ntawm cov sawb nyob rau hauv qhov kev txiav txim ntawm cov yob yuav nyob ntawm seb muaj pes tsawg leeg thiab cov yam ntxwv ntawm cov hlau oxide nplai tsim ua ntej nkag mus rau txhua qhov chaw ntawm lub tshuab dov. Qhov no hlau oxide nplai yog hu ua tertiary hlau oxide nplai vim tias nws yog tsim tom qab descaling thiab ua ntej nkag mus rau lub tshuab tiav. Nws qhov tsis xws luag yog pom ntawm qhov muag liab qab: tsaus xim av, lub nkoj -puab. It is relatively dense, fine, and scattered on the surface of the defective strip, and can be felt by hand. Tom qab pickling, nws tawm pinhole -zoo li pits ntawm qhov sib txawv qhov tob ntawm qhov chaw tsis zoo ntawm lub strip nto; cov no tsis pom nyob rau saum npoo ntawm ib txwm kub -rolled strip.
Liab hlau oxide nplai: Liab hlau oxide nplai tsuas yog tshwm sim ntawm cov qib steel tshwj xeeb xws li cov uas muaj cov ntsiab lus silicon siab, feem ntau yog vim muaj qhov sib cuam tshuam ntawm cov oxides ntawm lub hauv paus hlau thaum lub sij hawm cua sov txheej txheem. Nws tsis muaj qhov pom tseeb qhov tob thiab zoo li tsis xwm yeem flakes. Tshwj xeeb, nws muab faib ua ob hom.
Ib hom tsis yog-ib txwm faib nyob rau hauv dav kev taw qhia ntawm lub phaj, feem ntau faib rau hauv nruab nrab, biased rau sab kev khiav hauj lwm. Muaj cov cim dej pom tseeb hauv thaj chaw liab thiab xiav. Nws kuj tseem tsis sib npaug ntawm qhov ntev ntawm cov phaj steel, nrog rau qee qhov chaw yog me ntsis sib dua. Thawj hom liab hlau oxide nplai no kuj yog tuab thiab tuaj yeem flake tawm thaum lub sij hawm ncaj. Nws tuaj yeem raug cua tshuab nrog siab - huab cua siab, thiab cov xim liab residual yog yooj yim wiped tawm. Hu rau hom liab hlau oxide nplai "liab xeb" yog qhov tseeb dua.
Lwm hom liab hlau oxide nplai yog sib npaug sib npaug ntawm qhov dav ntawm lub phaj, feem ntau hnyav dua me ntsis hauv thawj 100 hli ntawm ntug, thiab hnyav dua rau sab nraud ntawm lub kauj dua li sab hauv. Hom liab oxide nplai no yog nyias thiab tsis yooj yim so; lub thicker lub steel phaj, hnyav dua xim liab. Hom liab hlau oxide nplai no kuj muaj nyob rau hauv qee cov qib steel thiab muaj ntau heev.
