Ferro silicon 70 | Si >= 70 Deoxidizer thiab alloy additive rau steelmaking thiab casting

Ferrosilicon 70 (FeSi70)yog ib tug ntau yam alloying additive nyob rau hauv metallurgy kev lag luam. Nws cov haujlwm tseem ceeb tsom rau deoxidation thiab alloying ntxiv dag zog rau hauv steelmaking. Nrog nws qhov zoo ntawm "sib npaug silicon cov ntsiab lus thiab cov nqi tswj tau", nws tsim nyog rau kev tsim cov hlau tseem ceeb xws li cov pa roj carbon zoo tib yam thiab cov hlau tsis tshua muaj hlau. Kev tswj xyuas meej ntawm nws cov nyiaj ntxiv ncaj qha cuam tshuam rau purity ntawm molten steel thiab cov khoom siv ntawm cov hlau.

 Kev sib xyaw ntau yam:Si 68% -72%, Fe 25% -28%, impurities Al Tsawg dua lossis sib npaug 1.5%, S Tsawg dua lossis sib npaug 0.05%, P Tsawg dua lossis sib npaug 0.04%, C Tsawg dua lossis sib npaug 0.2%;
 Lub cev muaj zog:Melting point 1250-1280 degree, ceev 6.9-7.1g/cm³, silvery-greypob (10-50mm)los yoggranules (1-10mm), tawv thiab brittle kev ntxhib los mos, muaj zog txo cov khoom ntawm qhov kub thiab txias;
 Core zoo:Tus nqi sib npaug -kev ua tau zoo, ruaj khov deoxidation efficiency, tus nqi 8% -12% qis duaFerroSilicon 75, haum rau loj - teev ntau lawm.

(1) Steelmaking Deoxidation: Core Functions thiab Quantitative Effects

FeSi70% yog lub ntsiab deoxidizer hauv kev lag luam steelmaking. Nws ua tiav deoxidation los ntawm cov tshuaj tiv thaiv ntawm silicon nrog oxygen nyob rau hauv molten steel, thaum ib txhij optimizing lub purity ntawm molten steel:

Core Reaction Mechanism:

Si + 2FeO → SiO₂ + 2Fe (spontaneous cov tshuaj tiv thaiv nyob rau hauv molten steel ntawm 1500-1600℃). Qhov ntom ntawm SiO₂ generated yog qis dua li cov hlau molten, ua kom yooj yim rau ntab thiab tshem tawm nrog cov slag;

Tus Nqi Ntxiv Pauv:

0.3% -0.8% ntawm cov hlau molten, uas tuaj yeem txo cov pa oxygen ntawm molten steel los ntawm 80-100ppm mus rau 35-55ppm, ua tiav cov deoxidation efficiency ntawm 45% -65%;

Comparative zoo:

Piv nrogFerroSilicon 65, lub deoxidation efficiency yog nce los ntawm 10% -15%; piv nrog FeSi 75%, tus nqi txo . 8% -12%, thiab cov nyhuv deoxidation ua tau raws li cov kev cai ntawm cov hlau zoo tib yam thiab cov hlau tsis tshua muaj hlau;

(2) Alloying nyhuv: kev ua tau zoo thiab kev txhim kho kom muaj nuj nqis

FeSi alloy 70 txhim kho cov khoom siv hluav taws xob ntawm cov hlau los ntawm cov kev daws teeb meem ntxiv dag zog ntawm silicon, thiab tsim nyog rau kev tsim cov hlau tsis tshua muaj hlau thiab cov qauv hlau:

Core zog mechanism:

Silicon atoms tau muab tso rau hauv ferrite lattice, ua rau lub lattice distortion, cuam tshuam kev txav txav, thiab tib lub sij hawm refining cov nplej, yog li txhim kho lub zog thiab hardness ntawm cov hlau;

Tsawg alloy qauv hlau (xws li Q355):

Ntxiv 0.2% -0.5% FerroSilicon alloy 70%, tswj cov ntsiab lus silicon hauv cov hlau mus rau 0.3%-0.6%, lub zog tensile nce los ntawm 345MPa rau 380-400MPa, lub zog tawm los ntawm 10% -15%, thiab qhov cuam tshuam toughness (-20 ° J / cm2)

Ordinary carbon hlau (xws li Q235):

Ntxiv 0.3% -0.4% FerroSilicon alloy 70, lub zog tensile nce los ntawm 235MPa rau 270-290MPa, ua tau raws li qhov yuav tsum tau muaj zog ntawm lub tsev thiab cov khoom siv kho tshuab.

(1) Kev lag luam Steelmaking: Mainstream Deoxidation thiab Alloying Raw Khoom

Cov Qib Siab Zoo: Cov pa roj carbon zoo tib yam (Q235, Q255), qis- alloy siab- lub zog steel (Q355, Q420), welded structural steel (Q345R), thiab lwm yam.;

 Txheej txheem Adaptation:

Hloov Steelmaking:Ntxiv thaum tapping (10-50mm blocky), 0.4% -0.8%, siv turbulent mixing ntawm molten steel rau cov tshuaj tiv thaiv deoxidation tag nrho;
Hluav taws xob rauv Steelmaking:Ntxiv rau theem tom ntej ntawm lub cub tawg nqi melting (1-10mm granular), 0.3% -0.6%, ua ke nrog argon nplawm los txhim kho cov uniformity ntawm molten steel muaj pes tsawg leeg;

(2) Kev lag luam Foundry: Inoculant thiab Flowability Improver

FeSi70 Nyob rau hauv casting, nws yog tsuas yog siv nyob rau hauv zus tau tej cov grey cam khwb cia hlau thiab ductile hlau los txhim kho qhov zoo ntawm castings:

 Daim ntawv thov Inoculant:

Mechanism ntawm kev ua:Txhawb nqa graphitization nag lossis daus, zam cov hlau dawb tsim, thiab refines graphite nplej thiab matrix qauv;

Quantitative effect:Nrog rau qhov sib ntxiv ntawm 0.2% -0.5% granular FeSi70 (1-3mm) (grey cam khwb cia hlau), lub zog tensile ntawm castings nce los ntawm 200MPa mus rau 250-280MPa, thiab porosity defect tus nqi txo los ntawm 0.8% mus rau 0.2%;

 Txhim kho fluidity:

Mechanism ntawm kev ua:Silicon lub caij txo cov viscosity ntawm molten hlau, txhim kho fluidity, thiab txo qhov tsis xws luag xws li "tsis txaus pouring" thiab "txias kaw";

Quantitative effect:Nrog rau qhov sib ntxiv ntawm 0.3% -0.4% FeSi70, fluidity ntawm molten hlau yog txhim kho los ntawm 15% -20%, uas yog haum rau zus tau tej cov castings nrog complex lug;

(3) Lwm daim ntawv thov scenarios

Ferroalloy ntau lawm:Raws li ib tug txo tus neeg sawv cev, nws pab nyob rau hauv zus tau tej cov alloys xws li ferromanganese thiab ferrochrome. Cov nyiaj ntxiv yog 1% -2%, uas txhim kho cov alloy rov qab tus nqi . 5% -8%;
Recycled steel smelting:Replenish silicon poob hauv cov hlau siv dua tshiab, ntxiv 0.5% -0.7% kom ntseeg tau tias cov hlau sib xyaw ua tau raws li cov qauv thiab txo cov seem seem;

(1) Core xaiv logic

Hlau qib / Casting yuav tsum tau:

Xaiv FeSi70 rau cov hlau zoo tib yam thiab cov pa ua haujlwm, thiab FeSi75 (siab dua deoxidation efficiency) rau siab -kawg steel thiab precision casting;

Txheej txheem compatibility:

Xaiv blocky (10-50mm) rau converter / hluav taws xob rauv steelmaking, thiab granular (1-3mm) rau casting inoculation;

Tus nqi sib npaug:

FeSi70 muaj tus nqi zoo tshaj plaws. Yog tias qib steel muaj cov kev cai nruj rau impurities (xws li Al Tsawg dua lossis sib npaug li 0.8%), qis - alumina FeSi70 tuaj yeem xaiv.

(2) Parameter sib piv cov lus rau txawv scenarios