Nyob rau hauv cov complex thiab muaj txuj ci siab heev ntawm steel ntau lawm, ntau yam kev ua si tseem ceeb thiab feem ntau tshwj xeeb cov luag haujlwm. Ntawm cov no,calcium siliconsawv raws li cov multifunctional additive uas tseem ceeb pab txhawb rau qhov zoo thiab cov khoom ntawm cov khoom kawg steel.
Lub luag haujlwm ntawm calcium silicon hauv cov steel ntau lawm
1. Deoxidation
Ib qho ntawm cov haujlwm tseem ceeb ntawm casi hauv steelmaking yogdeoxidationCov. Thaum lub sij hawm cov txheej txheem steel ntau lawm, oxygen yog inevitably qhia mus rau hauv cov hlau molten. Yog tias sab laug unchecked, cov pa oxygen no tuaj yeem tsim cov hlau oxides, uas yog detrimental rau cov khoom siv me me ntawm cov hlau. Silicon calcium ua raws li lub zog deoxidizing tus neeg sawv cev. Thaum ntxiv rau Molten Steel hlau, calcium thiab silicon hauv nws hnov mob nrog cov pa. Silicon muaj kev muaj zog nyob rau oxygen thiab cov ntaub ntawv silicon dioxide (sitio₂). Nyob rau tib lub sijhawm, calcium reacts nrog oxygen kom daim ntawv calcium oxide (cao). Cov oxides tom qab ntawd txawm ntab rau saum npoo ntawm cov hlau molten hlau li slag lossis raug tshem tawm ntawm lwm cov txheej txheem refining. Los ntawm kev tshem tawm oxygen, calcium silicon pab kom txo cov khoom siv ntawm cov hlau, uas nyob rau hauv lem txhim kho cov khoom siv xws li xws li muaj lub zog, kev nruj me ntsis, thiab ductility.
2. Cov kev hloov pauv hloov tshiab
Suav nrog hauv hlau, txawm hais tias txo qis hauv tus lej ntawm deoxidation, tseem tuaj yeem muaj tam sim no. Txawm li cas los xij, hom, qhov loj me, thiab faib cov kev suav nrog no tuaj yeem hloov kho siv calcium silicon. Cov calcium hauv calcium silic silic silic silicon reacts nrog sulphur thiab cov pa-muaj suav nrog. Piv txwv li, nws tuaj yeem hloov kho zog thiab loj me uj graphe sulfide (MNS) suav nrog ntau cov kev sib tw thiab cov khoom muaj teeb meem tsawg dua) suav nrog. Qhov kev hloov kho no ntawm cov suav nrog yog qhov tseem ceeb vim tias cov duab thiab cov xwm txheej ntawm cov suav nrog tuaj yeem cuam tshuam rau cov hlau ua kev ua haujlwm. Sib npaug suav nrog tsis muaj feem yuav ua raws li kev ntxhov siab tsa, uas txhais tau tias tus hlau tsis muaj zog dhau mus tawg thiab muaj kev qaug zog zoo dua. Hauv cov ntawv thov uas cov qauv hlau tau rov qab ua haujlwm ntau dua, cov khoom siv tshuab, lub luag haujlwm ntawm calcium silicon nyob rau hauv inclusion hloov zuj zus.
3. Desulfurization
Sulphur yog ib tug impurity nyob rau hauv cov hlau uas tuaj yeem ua rau kub tsis ntev, muaj qhov mob ntawm cov txheej txheem kub zoo li kev ua haujlwm kub zoo li kev zam lossis dov. Calcium silicon yog qhov ua tau zoo enduldizing tus neeg sawv cev. Cov calcium hauv calcium silic silic silicoron reacts nrog cov leej faj hauv Molten Steel los ua daim calcium sulfide (CAS). Cas muaj lub siab melting taw tes thiab qis solubility hauv Molten hlau, yog li nws precipitates tawm thiab tuaj yeem tshem tawm nrog slag. Los ntawm kev txo cov kab lus sulfur hauv cov hlau, calcium silicon pab txhawm rau txhim kho cov hlau kub ua haujlwm thiab nws tag nrho zoo. Qhov no yog qhov tshwj xeeb tshaj yog nyob rau hauv kev tsim cov qib siab - cov xim zoo rau cov ntawv thov uas muaj kev tsim khoom zoo, xws li hauv kev tsim cov roj thiab roj kev lag luam.
4. Lis Refinement
Calcium silicon tseem ua lub luag haujlwm hauv cov nplej ua kom zoo nkauj hauv cov hlau. Cov nplej nplej hauv cov hlau yog txuam nrog kev txhim kho cov khoom siv neeg kho tshuab. Qhov sib ntxiv ntawm calcium silicon rau Molten Steel tuaj yeem ua raws li qhov chaw nucleation rau kev tsim cov khoom tshiab thaum lub suab nrov. Raws li cov hlau txias thiab solunifies, cov chaw no txhawb txoj kev loj hlob ntawm cov qoob loo loj dua ntau dua li cov nplej tsawg dua. Ib lub qauv nplej zoo kawg tau ua rau muaj zog ntxiv, kev ua kom nruj, thiab zoo dua tsis kam mus rau kev xeb. Hauv kev tsim kho kev tsim kho, piv txwv li nrog cov qauv ua kom zoo nkauj vim tias siv cov qauv calcium yog qhov tsim nyog rau kev tsim cov khoom lag luam thiab ib puag ncig kev nyuaj siab ntau dua.
5. Txhim Kho Kev Castability
Hauv cov txheej txheem txuas txuas ntxiv, uas tau siv dav hauv kev tsim khoom niaj hnub, muaj peev xwm ntawm Molten Steel ntws thiab khov kho yog qhov tseem ceeb heev. Calcium silicon tuaj yeem txhim kho lub Castability ntawm hlau. Los ntawm kev kho cov av nro thiab viscosity ntawm cov hlau molten, nws xyuas kom cov hlau tuaj yeem pov rau hauv ntau cov duab nrog tsawg dua qhov tsis xws luag. Muaj cov calcium thiab silicon hauv cov hlau molten ua kom txo cov kev tsis xws luag xws li cov kab nrib pleb thiab porosity thaum lub sijhawm ua. Qhov no ua rau muaj ntau dua cov khoom lag luam siab - Cov khoom lag luam zoo thiab txo qhov xav tau ntawm cov ncej - ua haujlwm, yog li nce cov txheej txheem ntau lawm ntawm cov hlau ntau txheej txheem.
Hauv kev xaus, calcium silicon yog qhov tseem ceeb additive hauv cov steel ntau lawm. Nws cov haujlwm hauv Deagidation, suav nrog kev hloov kho, kev ua kom zoo dua qub, cov khoom ua kom zoo nkauj tag nrho cov hlau ua kom zoo dua qub thiab cov yam ntxwv ua tau zoo. Raws li qhov kev thov rau qib siab - kev ua tau zoo cov hlau txuas ntxiv mus rau ntau yam kev lag luam, lub luag haujlwm ntawm CASI hauv kev tsim khoom Steel hauv kev tsim tawm steel.
