Ib txwmferrosilicondeoxidation raug kev txom nyem los ntawm ob qhov teeb meem loj:ua ntej, cov khoom deoxidation Al₂O₃ (aluminium impurities nyob rau hauv ferrosilicon) yog ib tug me me inclusion, nyuaj rau tshem tawm los ntawm molten steel, cuam tshuam steel purity;thib ob, nws tsuas yog deoxidizes, tsis yog ib txhij desulfurizes, yuav tsum tau ntxiv cov desulfurizing tus neeg sawv cev.
Silicon carbide(SiC, purity ntau dua lossis sib npaug li 98%) qhia meej txog cov kev tsis txaus no nrog nws cov txiaj ntsig tseem ceeb:
Aluminium -dawb:Tsis muaj txhuas, zam kev tsim ntawm Al₂O₃ suav nrog, ua rau nws tsim nyog rau qis -aluminium steel thiab ultra- ntshiab steel ntau lawm;
Multi-kev koom ua ke ua haujlwm:Ua ke deoxidation, desulfurization, thiab grain refinement functions, simplifying cov txheej txheem steelmaking;
Qhov zoo ntawm Thermodynamic:Cov tshuaj tiv thaiv ruaj khov dua ntawm qhov kub thiab txias, cov khoom deoxidation yooj yim ntab, ua rau cov hlau huv dua.
Core Mechanism of Action
(1) Deoxidation Mechanism
Silicon carbide undergoes decomposition thiab txo cov tshuaj tiv thaiv hauv molten steel ntawm 1500-1600 degree:
Cov tshuaj tiv thaiv tseem ceeb:SiC + 2FeO → SiO₂ + 2Fe + CO↑
Cov tshuaj tiv thaiv pab:SiC + 3FeO → SiO₂ + 3Fe + CO₂↑
Cov khoom tsim SiO₂ muaj qhov ntom ntom qis dua li cov hlau molten thiab yooj yim tsim qis -melting- taw tes sib xyaw slag nrog CaO, uas yog tshem tawm sai sai los ntawm ntab. Cov pa roj CO / CO₂ nce tuaj yeem ua rau cov hlau molten, txhawb kev sib sau thiab kev loj hlob ntawm kev koom ua ke, ntxiv kev txhim kho cov purity ntawm cov hlau molten.
(2) Desulfurization thiab Grain Refinement Mechanism
Cov tshuaj tiv thaiv desulfurization:Cov [Si] uas ua los ntawm decomposition ntawm SiC tuaj yeem hnov mob nrog S hauv cov hlau molten los ua SiS, uas tau muab tshem tawm nrog cov slag. Tus nqi desulfurization tuaj yeem ncav cuag 40% -60%.
Grain refinement:Cov nplua carbides (SiC hais) tsim los ntawm cov tshuaj tiv thaiv tuaj yeem ua haujlwm raws li heterogeneous nucleation nuclei thaum lub sij hawm solidification ntawm molten steel, refining cov nplej thiab txhim kho lub toughness thiab lub zog ntawm cov hlau.
Core Advantages ntawm Silicon Carbide raws li kev hloov pauv rau Ferrosilicon
| Sib piv Dimensions | Silicon Carbide (SiC) | Ib txwm Ferrosilicon (FeSi75) |
| Deoxidation efficiency | Cov ntsiab lus oxygen hauv cov hlau molten poob ntawm 80-100 ppm rau 20-30 ppm | Oxygen cov ntsiab lus hauv cov hlau molten poob ntawm 80-100 ppm rau 30-50 ppm |
| Desulfurization muaj peev xwm | Desulfurization tus nqi: 40% -60%, nrog rau ib txhij deoxygenation thiab desulfurization. | Deoxygenation nkaus xwb, tus nqi desulfurization<10%. |
| Inclusion Control | Tsis muaj Al₂O₃ suav nrog, SiO₂ tau yooj yim tshem tawm | Muaj me me Al₂O₃ suav nrog, nyuaj rau tshem tawm |
| Hlau purity | Tag nrho suav nrog txo los ntawm 50% -70% | Tag nrho cov suav nrog yog qhov siab |
| Grain refinement effect | Grain loj refinement 30% -40% | Tsis muaj qhov tseem ceeb grain refinement nyhuv |
| Compatible Steel Qib | Tsawg- txhuas hlau, ultra- steel ntshiab, bearing steel, thiab lwm yam. | Ordinary carbon steel, qis- alloy steel |
Kev Siv Tau Siv Tau Zoo thiab Scenario Adaptability
(1) Daim Ntawv Thov Kev Cai
Ib tsob ntoo loj steel siv silicon carbide los hloov FeSi thaum tsim GCr15 bearing steel (tsawg aluminium yuav tsum tau: Als Tsawg dua los yog sib npaug rau 0.005%):
Deoxidation nyhuv:Cov ntsiab lus oxygen hauv cov hlau molten poob ntawm 90ppm rau 25ppm, txo qis ntawm 72.2%;
Kev hloov pauv suav nrog:Al₂O₃ suav nrog yuav luag xoom, thiab tag nrho cov ntsiab lus suav nrog poob ntawm 12mg / 10kg txog 3.5mg / 10kg;
Mechanical zog:Tensile zog nce los ntawm 1800MPa rau 1950MPa, thiab cuam tshuam toughness (-20 degree) nce los ntawm 28J / cm² rau 42J / cm²;
Txheej txheem simplification:Tsis tas yuav tsum muaj tus neeg sawv cev desulfurizing ntxiv, thiab tus nqi ntawm cov khoom pabcuam ib tuj ntawm cov hlau raug txo los ntawm 30-50 yuan.
(2) Cov xwm txheej tsim nyog
Qhov Tseem Ceeb Hloov Scenarios:High-qib steel qib siab rau kev suav nrog, xws li qis-aluminium steel, ultra- steel ntshiab, bearing steel, thiab caij nplooj ntoos hlav steel;
Cov xwm txheej tsis zoo:Cov pa roj carbon zoo tib yam (tus nqi siab dua ferro silicon, tsis muaj nqi- ua kom zoo dua), cov qib steel xav tau siab - silicon alloying (silicon carbide silicon cov ntsiab lus tso tawm qis dua ferrosilicon).
Cov ntsiab lus tseem ceeb rau Kev Tswj Xyuas Txheej Txheem
(1) Ntxiv Tus Nqi thiab Txoj Kev
Ntxiv Tus Nqi:
Tswj ntawm 0.3%-0.8% ntawm cov hlau molten (0.5%-0.8% rau high-end steel, 0.3%-0.5% rau cov hlau zoo tib yam);
Lub Sijhawm Ntxiv:
Ntxiv nrog rau qhov ntws thaum lub converter tapping ncav cuag 1/2, los yog ntxiv nyob rau hauv thawj theem ntawm LF rauv refining los xyuas kom meej txaus cov tshuaj tiv thaiv;
Lub cev xav tau:
Xaiv blocky silicon carbide nrog qhov loj ntawm 3-10mm kom tsis txhob hlawv ntau dhau vim hmoov.
(2) Cov txheej txheem hloov kho thiab hloov kho
Slag Basicity:
Tswj CaO/SiO₂=1.2-1.5 los txhim kho cov slag lub peev xwm adsorption rau SiO₂;
Kev tswj qhov kub thiab txias:
Tuav lub molten steel kub ntawm 1550-1600℃los xyuas kom meej txaus SiC decomposition cov tshuaj tiv thaiv;
Kev siv ua ke:
Thaum ntxiv nrog raucalcium silicon alloysthiab ferromanganese, nws tuaj yeem txhim kho desulfurization thiab suav nrog kev tshem tawm.
(3) Cia thiab tiv thaiv
Cia:
Khaws rau hauv qhov chaw qhuav thiab qhov cua kom tsis txhob ya raws oxidation (oxidation yuav ua rau SiO₂ zaj duab xis, txo reactivity);
Kev nyab xeeb:
Khaws kom deb ntawm cov nplaim taws thaum ntxiv. CO / CO₂ gases yuav tsum tau tso tawm los ntawm qhov tso pa tawm kom tsis txhob muaj ntau tshaj li cov qauv kev ua haujlwm roj.
