Thaum lub sij hawm steelmaking txheej txheem, oxygen, sulfur thiab lwm yam impurities yuav muaj nyob rau hauv cov hlau molten, uas yuav cuam tshuam qhov zoo thiab plasticity ntawm cov hlau.
Ntxiv calcium tuaj yeem ua lub luag haujlwm hauv qab no:
Txo cov pa oxygen
Tom qab ntxiv calcium, calcium reacts nrog oxides hauv cov hlau molten los ua calcium oxide, yog li txo cov pa oxygen hauv cov hlau molten. Qhov no tuaj yeem tiv thaiv cov oxides hauv cov hlau los ntawm kev tsim cov qhov, yog li txhim kho qhov ntom thiab zoo ntawm cov hlau.
Txo cov ntsiab lus sulfur
Calcium tuaj yeem hnov mob nrog sulfides hauv cov hlau molten los tsim calcium sulfide, yog li txo cov sulfur cov ntsiab lus hauv cov hlau molten. Sulfur yog ib qho teeb meem impurity uas tuaj yeem yooj yim nce brittleness ntawm hlau thiab cuam tshuam rau nws cov plasticity. Los ntawm kev ntxiv calcium, sulfur cov ntsiab lus ntawm cov hlau yuav raug txo, yog li txhim kho cov yas thiab toughness ntawm hlau.
Txo cov ntsiab lus nitrogen
Cov ntsiab lus nitrogen hauv cov hlau molten kuj cuam tshuam rau kev ua haujlwm ntawm cov hlau. Ntxiv calcium tuaj yeem denitrify thiab txo cov ntsiab lus nitrogen hauv cov hlau. Tsis tas li ntawd, calcium muaj qhov nqus oxygen siab thiab tuaj yeem nqus cov nitrogen hauv cov hlau molten ntawm qhov chaw kom txo tau cov ntsiab lus nitrogen hauv cov hlau. Los ntawm kev txo cov ntsiab lus nitrogen hauv cov hlau, cov nqi tsim khoom ntawm cov hlau tuaj yeem raug txo.
Feem ntau cov calcium uas muaj hlau alloys muaj xws li:silicon calcium, silicon barium calcium, silicon aluminium barium calcium, silicon calcium cored hlau, calcium aluminium cored hlau, calcium ferro cored hlau, lwm.
Silicon calcium, silicon calcium cored hlau:binary alloys muaj li ntawm silicon thiab calcium, teej tug mus rau qeb ntawm hlau alloys. Nws cov khoom tseem ceeb yog silicon thiab calcium, thiab nws kuj muaj ntau yam impurities xws li hlau, txhuas, carbon, sulfur thiab phosphorus. Kev lag luam steel siv nws ua calcium additive, deoxidizer, desulfurizer thiab denaturant rau non-metallic inclusions. Kev lag luam cam khwb cia hlau siv nws ua inoculant thiab denaturant. Silicon calcium alloys tau muab faib ua ntau pawg raws li cov ntsiab lus ntawm calcium thiab silicon:
Ca31Si60 31 50~65
Ca28Si60 28 50~65
Ca24Si60 24 55~65
Ca20Si55 20 50~60
Ca16Si55 16 50~60
Lwm yam impurities raug teev cais raws li kev siv sib txawv. Tsis tas li ntawd, nyob rau hauv lub hauv paus ntawm silicon-calcium alloy, lwm cov ntsiab lus tau ntxiv rau daim ntawv ternary los yog multi-element composite alloys. Xws li Si-Ca-Al; Si-Ca-Mn; Si-Ca-Ba, thiab lwm yam, uas yog siv los ua deoxidizers, desulfurizers, denitrifiers thiab alloying agents hauv steel metallurgy.
Silicon-barium-calcium:Silicon-calcium-barium alloy yog ib hom tshiab ntawm kev ua haujlwm siab ua haujlwm zoo hauv silicon alloys. Nws yog deoxidizer thiab desulfurizer rau steelmaking. Nws kuj muaj cov nyhuv dephosphorization thiab yog ib qho inoculant thiab modifier hauv casting.
Silicon-aluminium-barium-calcium:Nws yog qhov zoo dua deoxidizer thiab desulfurizer hauv barium alloys, uas txo cov pa oxygen hauv cov hlau kom qis dua. Nyob rau tib lub sijhawm, cov oxides nyuaj uas muaj calcium, barium, silicon thiab txhuas yog yooj yim rau ntab los ntawm cov hlau molten, purify cov hlau molten, thiab txhim kho qhov cuam tshuam toughness thiab kev ua haujlwm ntawm cov hlau.
Calcium aluminium cored hlau: siv rau kev sib sib zog nqus deoxidation ntawm refined hlau, cov hlau cored muaj cov khoom siv tseem ceeb thiab cov ntaub qhwv sab nrauv, lub tsho sab nrauv yog ua los ntawm 08 txhuas sawb hlau, nws lub ntsiab feature yog cov khoom siv tseem ceeb yog tsim los ntawm kev sib xyaw ntawm cov hlau calcium hmoov thiab hlau. aluminium hmoov, qhov feem pua ntawm cov hlau calcium hmoov hauv qhov hnyav ntawm cov khoom siv tseem ceeb yog 55% -65%, thiab feem pua ntawm cov hlau txhuas hmoov hauv qhov hnyav ntawm cov khoom tseem ceeb yog 35% -45% . Raws li cov lus qhia saum toj no, cov hlau calcium hmoov thiab hlau txhuas hmoov yog thawj zaug pub thiab sib xyaw rau hauv cov khoom siv tseem ceeb, thiab tom qab ntawd cov khoom siv tseem ceeb yog sib npaug ntxiv rau 08 txhuas hlau sawb ntawm lub tshuab wrapping thiab cov khoom tseem ceeb yog compacted, thiab thaum kawg dov mus rau hauv ib lub xaim zoo li cov khoom tiav. Nws tuaj yeem ua kom cov kua dej ntawm cov hlau calcium ntau ntxiv hauv cov hlau molten yuav tsum tau kho (tus nqi rov qab ntawm cov calcium), tswj cov tshuaj tiv thaiv ceev, tiv thaiv steel splashing, tsim calcium aluminium composite deoxidation, thiab ua tiav lub hom phiaj ntawm kev sib sib zog nqus deoxidation.
Calcium ferro cored hlau:Cov calcium hlau cored hlau yog ua los ntawm kev sib xyaw ntawm 25-35% calcium particles thiab cov hmoov hlau seem uas yog cov khoom siv tseem ceeb, thiab cov hlau cored yog ua los ntawm cov hlau strip steel li lub sheath. Cov ntsiab lus dav dav yog cov calcium 30 thiab calcium 40. Raws li cov deoxidizer rau molten steel refining, nws tuaj yeem tsis tsuas yog txo cov nozzle blockage, tab sis kuj zam qhov tsim ntawm cov sulfide ntev inclusions tom qab ntxiv calcium rau cov hlau, yog li txhim kho cov anisotropy ntawm cov hlau. .
