Siab carbon silicon 6818 (silicon carbon alloy), raws li kev sib xyaw deoxidizer muaj txiaj ntsig zoo, koom ua ke deoxidation, desulfurization, thiab suav nrog kev hloov pauv kev ua haujlwm. Nws tuaj yeem hloov cov ntaub ntawv nyoos xws liferrosilicon, silicon carbide, thiab carburizers, ua tiav cov nqi txo, txhim kho kev ua haujlwm, thiab txhim kho steel zoo hauv cov txheej txheem steelmaking. Nws cov silicon-carbon piv (Si Ntau dua lossis sib npaug li 68%, C Ntau dua lossis sib npaug li 18%) yog qhov tseeb raws li qhov xav tau purity ntawm nruab nrab - mus rau - siab - qib steel kawg.
Kev tsim ntawm hc silicon 6818 yog los ntawm cov ntsiab lus ntawm "silicon cov ntsiab lus Ntau dua lossis sib npaug rau 68% + cov ntsiab lus carbon Ntau dua lossis sib npaug rau 18%":
Cov ntsiab lus tseem ceeb:Si 68% -75%, C 18% -22% (cov ntsiab lus tseem ceeb), impurities Al Tsawg dua lossis sib npaug 1.2%, S Tsawg dua lossis sib npaug 0.04%, P Tsawg dua lossis sib npaug 0.03%, Fe 5% -10%;
Lub cev muaj zog:melting point 1180-1280 degree, ceev 2.9-3.3g / cm³, nyob rau hauv daim ntawv thaiv (10-100mm, accounting rau ntau tshaj los yog sib npaug rau 90%) los yog customized loj (10-60mm), muaj zog tshuaj ua hauj lwm ntawm kub kub, muaj ob qho tib si muaj zog txo thiab carbonizing zog;
Core mechanism ntawm kev txiav txim thiab ntau npaum li cas
(1) Composite deoxidation: sib sib zog nqus purification ntawm molten hlau
Reaction txoj cai:
Silicon{0}}tso cai deoxidation:Si + 2FeO → SiO₂ + 2Fe, qhov ntom ntawm SiO₂ 2.65 g/cm³, yooj yim ntab thiab tshem tawm nrog cov slag;
Cov pa roj carbon-synergistic deoxidation:C + FeO → CO↑ + Fe, CO gas agitates cov hlau molten, txhawb kev sib txuam flotation ntawm inclusions thiab tsis txhob localized deoxidation qhov muag tsis pom chaw;
Dual deoxidation hom:Ua tiav cov organic sib xyaw ua ke ntawm "dej nag deoxidation + diffusion deoxidation," daws qhov teeb meem ntawm cov tshuaj tiv thaiv tsis txaus hauv cov tshuaj deoxidizers;
Quantitative effect:
Nrog rau qhov sib ntxiv ntawm 0.6% -1.2%, cov ntsiab lus oxygen hauv cov hlau molten txo los ntawm 80-100 ppm rau 30-45 ppm, thiab deoxidation efficiency nce mus txog 56% -70%;
Piv nrog cov tsoos ferrosilicon:Tag nrho cov nyiaj ntawm oxide suav nrog txo los ntawm 50% -60%, thiab qhov tsis xws luag sab hauv ntawm lub billet txo los ntawm 1.5% mus rau 0.4%.
(2) Desulfurization thiab Inclusion Modification: Txhim kho Steel Purity
Desulfurization Mechanism:Si reacts indirect nrog sulfur nyob rau hauv molten steel (Si + 2FeS + 2CaO → Ca₂SiO₄ + 2Fe), thiab nrog cov nyhuv stirring ntawm carbon, desulfurization tus nqi nce mus txog 40% -55%, txo cov sulfur ntsiab lus ntawm molten hlau los ntawm 0.05% mus rau 0.02% -0.03%;
Kev hloov pauv suav nrog:Angular Al₂O₃ inclusions (siab hardness, yooj yim khawb lub matrix) nyob rau hauv steel yog hloov mus rau spherical CaO・SiO₂ composite inclusions (tsis tshua muaj hardness, yooj yim deformable), txo kev puas tsuaj rau lub mechanical zog ntawm steel thiab nce tej yam toughness (-20 degree) los ntawm 25% -35%.
(3) Carbon Addition Control: Precisely Matching Steel Qib Requirements
Mechanism ntawm Action:Cov ntsiab lus carbon yaj ncaj qha rau hauv cov hlau molten, ua tiav cov pa roj carbon ntxiv ntawm 90% -95%, deb tshaj li ntawm cov tshuaj graphite carbon additives (60% -70%);
Quantitative Effects:Nws tuaj yeem tswj tau cov ntsiab lus ntawm cov pa roj carbon monoxide ntawm 0.06% rau 0.20% -0.50%, ua tau raws li cov pa roj carbon ntxiv ntawm cov pa roj carbon steel nruab nrab (45 #), alloy structural steel (40Cr), thiab cov hlau tsis muaj steel, nrog cov khoom sib txawv sib txawv tsawg dua lossis sib npaug li ± 0.015%.
