siv ferro silicon hauv steel kev lag luam

Cov qib tseem ceeb ntawmferrosiliconyogFeSi 75(Si 72% -80%, Fe 20% -28%) thiabFeSi 70(Si 68% -75%, Fe 25% -32%), nrog impurities ntawm Al Tsawg dua lossis sib npaug rau 1.5%, S Tsawg dua lossis sib npaug rau 0.05%, thiab P Tsawg dua lossis sib npaug li 0.04%.

Lub cev muaj zog:Melting point 1250-1350 degree, ntom 6.9-7.1 g / cm³, tshwm li silvery-grey lumps (10-50mm) los yog granules (1-10mm), pom muaj zog txo zog ntawm qhov kub thiab txias.

Core zoo:High deoxidation efficiency, tsis tshua muaj alloying nqi, muaj zog txheej txheem adaptability, thiab ib tug ferrosilicon noj ntawm kwv yees li 3-8 kg ib ton ntawm steel, ua rau nws cov nqi-zoo tshaj cov khoom siv nyob rau hauv kev lag luam steelmaking.

(1) Core Function 1: Siab -Kev Ua Haujlwm Zoo Tshaj Tawm

Ferrosilicon yog qhov nyiam deoxidizer hauv steelmaking. Nws tshem tawm cov teeb meem impurities los ntawm cov tshuaj tiv thaiv ntawm silicon nrog oxygen nyob rau hauv molten steel, kom ntseeg tau lub purity ntawm cov hlau:

Reaction Mechanism:

Si + 2FeO → SiO₂ + 2Fe (spontaneous cov tshuaj tiv thaiv nyob rau hauv molten steel ntawm 1500-1600 degree), qhov ceev ntawm cov generated SiO₂ yog 2.65g / cm³, ntau qis dua cov hlau molten (7.8g / cm³), thiab nws yooj yim tshem tawm nrog slag;

Quantitative Effects:

Ntxiv 0.3% -0.8% FeSi75 tuaj yeem txo cov pa oxygen ntawm cov hlau molten los ntawm 80-100ppm rau 35-55ppm, nrog rau deoxidation efficiency ntawm 45% -65%;

Comparative zoo:

Piv nrog cov ntshiab silicon, ferrosilicon deoxidation yog softer, tsis txhob ua nruj ua tsiv ntawm molten steel; thaum siv nrog txhuas deoxidation, nws muaj peev xwm ua kom tsawg -melting-point... Al₂O₃・SiO₂ composite inclusions ntxiv txhim khu cov nyhuv deoxidation, txo tag nrho cov nyiaj ntawm oxide inclusions los ntawm 60% -70%;

(2) Core Function Ob: Alloying Strengthening

Silicon-hlau steel ua tiav kev txhim kho cov khoom siv hluav taws xob ntawm cov hlau los ntawm cov kev daws teeb meem ntxiv dag zog ntawm silicon, ua raws li cov kev xav tau ntawm cov hlau ntawm cov qib sib txawv:
Strengthening Mechanism: Silicon atoms tau muab tso rau hauv ferrite thiab pearlite lattice, ua rau cov lattice distortion, cuam tshuam kev txav mus los, thiab ua kom zoo dua cov nplej, yog li txhim kho lub zog, hardness thiab hnav tsis kam ntawm cov hlau;

 Quantitative Performance Improvement:

Tsawg alloy qauv hlau (Q355):Ntxiv 0.2%-0.5% FeSi75, tswj cov ntsiab lus silicon hauv cov hlau mus rau 0.3%-0.6%, lub zog tensile nce los ntawm 345MPa mus rau 380-400MPa, thiab lub zog tawm los ntawm 10% -15%;
Hluav taws xob silicon steel (50W470):Ntxiv 1.0%-1.5% FeSi75%, cov ntsiab lus silicon nce mus txog ... 3.0% -4.5%, nce magnetic permeability los ntawm 20% -30%, txo cov hlau poob los ntawm 15% -25%, haum rau transformer thiab motor core manufacturing;

Hnav-cov hlau tsis muaj zog (NM450):Ntxiv 1.5%-2.0% FerroSilicon 75, tsim Fe₃C-SiC cov theem nyuaj nrog cov pa roj carbon, ua kom cov hlau tawv tawv (HRC) ntawm 25 txog 45-50, thiab txhim kho hnav tsis kam los ntawm 40% -60%.

(3) Core Function Peb: Kev Ua Haujlwm Zoo

Ferrosilicon tuaj yeem txhim kho cov dej ntws ntawm cov hlau molten, tswj qhov kub thiab txias, thiab ua kom cov nplej loj, ua kom muaj kev ruaj ntseg ntawm steelmaking thiab casting txheej txheem:

 Txhim kho lub fluidity ntawm molten steel:

Mechanism ntawm kev ua:Silicon txo cov viscosity thiab nto nro ntawm cov hlau molten, txhim kho lub peev xwm filling;

Kev ua kom muaj nuj nqis: Ntxiv 0.3% -0.5% FeSi75 ua kom cov dej ntws ntawm cov hlau molten los ntawm 15% -20%, thiab txo qhov tsis xws luag ntawm "tsis tiav filling" thiab "txias kaw" hauv cov qauv txheej txheem los ntawm 1.2% mus rau 0.3%;

Regulating kub ntawm molten steel:Cov tshuaj tiv thaiv ntawm silicon thiab oxygen yog exothermic. Ntxiv 0.5% FeSi75 tuaj yeem nce qhov kub ntawm cov hlau molten los ntawm 30-50 degree, tsis txhob muaj cov khoom tsis zoo los ntawm qhov kub thiab txias;

 Refining grain loj:

Mechanism ntawm kev ua:Silicon inhibits austenite grain kev loj hlob thiab txhawb kev tsim cov qauv zoo nplej;

Quantitative effect:Ntxiv 0.4% FerroSilicon 75% rau cov hlau tsis tshua muaj hlau ua kom cov nplej loj ntawm 80μm mus rau 40-50μm, thiab txhim kho kev cuam tshuam toughness (-20 degree). 20% -30%.

Kev Ua Haujlwm Tseem Ceeb:Rau siab-kawg steels (hluav taws xob silicon steel, hnav-cov hlau tsis muaj zog), xaiv FeSi75 kom ntseeg tau tias deoxidation efficiency thiab alloying nyhuv;
Tus nqi sib npaug:Rau cov hlau zoo tib yam thiab cov hlau uas siv dua tshiab, xaiv qis - mus rau - cov qib nruab nrab (FeSi70/FeSi65) los tswj cov nqi raw khoom;