Yuav ua li cas xam silicon magnesium inoculant ntxiv tus nqi rau nodularization?

Nyob rau hauv ductile hlau ntau lawm, xam qhov tseeb ntxiv tus nqi rausilicon magnesium (SiMg) inoculantyog ib qho kev txiav txim siab tseem ceeb tshaj plaws uas tus foundry metallurgist ua. Hauv qab - ntxiv ua rau cov nodularization tsis txaus thiab cov khoom siv tsis zoo, thaum dhau - ntxiv cov khib nyiab kim kim thiab pheej hmoo tsim cov carbide. Nkag siab txog cov txheej txheem kev suav ua kom muaj qhov zoo ib yam ntawm cov hlau nodular thaum optimizing cov nqi tsim khoom.

Lub hauv paus ntawm tejsilicon magnesiumNtxiv tus nqi suav yog nkag siab ntau npaum li cas magnesium yuav tsum tau ua kom tiav nodularization. Lub hom phiaj residual magnesium cov ntsiab lus nyob rau hauv qhov kawg castings feem ntau yog li ntawm 0.035% mus rau 0.055%, nyob ntawm seb seem thickness, sulfur ntsiab lus, thiab tej yam yuav tsum tau casting.

Txawm li cas los xij, tus nqi ntawmsilicon magnesium inoculantntxiv yuav tsum suav rau qhov tsis zoo magnesium thaum lub sijhawm kho. Tsuas yog 30-60% ntawm magnesium muaj nyob hauvSiMg inoculanttseem tshuav li magnesium residual tom qab cov tshuaj tiv thaiv nodularization. Cov seem yog poob los ntawm:

Oxidation: Magnesium reacts hnyav nrog oxygen hauv cov hlau molten

Desulfurization: Magnesium preferentially reacts nrog sulfur los ua magnesium sulfide (MgS)

Evaporation: Magnesium muaj qhov kub siab qis (1090 degree) thiab vaporizes ntawm qhov kub thiab txias

Yog li ntawd, kev suav yuav tsum pib los ntawm qhov kawg ntawm qhov seem magnesium lub hom phiaj thiab ua haujlwm rov qab los ntawm tus nqi rov qab los txiav txim siab xav tausilicon magnesiumntxiv.

Cov qauv tsim nyog rausilicon magnesium inoculantntxiv yog:

Ntxiv tus nqi (kg/ton)=(Yuav tsum tau Mg Input × 1000) / (Mg Cov ntsiab lus hauv Inoculant × Rov Qab Tus Nqi)

Qhov twg:

Yuav tsum tau Mg Input= Target Residual Mg + Mg Siv los ntawm Sulfur

Mg Consumed los ntawm Sulfur≈ 0.76 × (Base Sulfur % – Final Sulfur %) × 10

Mg Cov ntsiab lus hauv Inoculant= feem ntau 5-10% rau ntauSiMg alloys

Tus nqi rov qab= feem ntau 35-55% nyob ntawm txoj kev kho

Piv txwv xam:
Rau lub hauv paus hlau nrog 0.02% sulfur, phiaj kawg sulfur ntawm 0.010%, phiaj residual Mg ntawm 0.045%, siv asilicon magnesium inoculantmuaj 8% Mg nrog kev cia siab 45% rov qab:

Mg siv los ntawm S=0.76 × (0.020 - 0.010) × 10=0.076 kg/ton

Yuav tsum tau Mg input=0.045 + 0.076=0.121 kg/ton

SiMg add= (0.121 × 1000) / (8 × 0.45)=121 / 3.6=33.6 kg/ton

Qhov kev suav no muab qhov pib theoretical, uas cov chaw tsim khoom tom qab ntawd kho raws li lawv cov txheej txheem tshwj xeeb.

Cov txheej txheem nodularization sib txawv cuam tshuam rau tus nqi rov qab thiab, yog li, covsilicon magnesium inoculantkev suav ntxiv. Txhua txoj kev muaj cov yam ntxwv efficiency ranges:

Txoj Kev Sandwich (Ladle Treatment):Kev rov qab zoo li qub 40-50%

• SiMg inoculantmuab tso rau hauv ib lub hnab ris hauv qab ntawm lub ladle
• Molten hlau poured ncaj qha tshaj lub alloy
• Muab kev sib xyaw zoo tab sis qee qhov magnesium poob rau atmospheric oxidation

Txoj kev Tundish Cover:Kev rov qab zoo li qub 45-60%

• Silicon magnesiummuab tso rau hauv ib lub chamber npog nyob rau hauv lub ladle
• Txo oxidation losses txhim kho efficiency
• Txaus siab rau kev tsim khoom loj dua

Hauv -Kev kho pwm:Kev rov qab zoo li qub 60-80%

• SiMg inoculantntxiv ncaj qha rau hauv pwm khiav system
• Lub sijhawm tsawg kawg ntawm qhov sib ntxiv thiab khov kho
• Kev ua tau zoo tshaj plaws tab sis yuav tsum tau ceev faj tswj xyuas

Hlau Feeding Method:Kev rov qab zoo li qub 50-70%

• Silicon magnesiumcored hlau txhaj rau hauv molten hlau
• Raws li kev tswj hwm tus nqi ntxiv
• Tso cai rau - lub sij hawm hloov kho raws li cov ntsiab lus sulfur

Foundries yuav tsum ntsuas tus nqi rov qab rau lawv cov cuab yeej tshwj xeeb thiab kev coj ua, feem ntau los ntawm kev sim ua kom sov thiab qhov seem ntawm magnesium tsom.

Ob tug ntxiv variables ho cuam tshuamsilicon magnesium inoculantNtxiv kev xam: puag hlau sulfur cov ntsiab lus thiab kev kho kub.

Cov ntsiab lus sulfur:Cov sulfur-magnesium cov tshuaj tiv thaiv noj magnesium nyiam dua. Lub hauv paus sulfur siab dua yuav tsum tau proportionally ntau duaSiMg inoculant. Rau txhua txhua 0.01% sulfur tshem tawm, kwv yees li 0.076 kg / ton ntawm magnesium yog noj. Qhov kev sib raug zoo no ua rau qis -sulfur hauv paus hlau (hauv qab 0.02% S) yog qhov xav tau los txo qissilicon magnesiumnoj thiab minimizing dross tsim.

Kub:Kev kho kub siab dua ua rau magnesium poob los ntawm ob qho tib si oxidation thiab evaporation. Rau txhua txhua 50℃nce siab tshaj 1450 degree, kev rov qab feem ntau txo qis los ntawm 5-10%. Kev suav yuav tsum suav nrog qhov ntsuas kub hloov pauv:

Kho qhov kub thiab txias=(Qhov Kub Kub - 1450 degree) × 0.002 × Base Ntxiv

Foundries ua haujlwm ntawm qhov kub thiab txias yuav tsum tau ncesilicon magnesiumntxiv tus nqi raws li.

Thaum lub laij lej muab qhov theoretical ntxiv tus nqi, kev siv tswv yim yuav tsum tau hloov ntau yam:

Precision qhov hnyav: Silicon magnesium inoculantyuav tsum tau hnyav kom raug, zoo dua nyob rau hauv ± 0.5 kg rau ib txwm 500-1000 kg melts. Txawm tias qhov hnyav me me tuaj yeem cuam tshuam qhov zoo ntawm nodularization.

Lump Size Distribution: SiMg inoculantparticle loj cuam tshuam tus nqi dissolution. Standard specifications feem ntau xav tau 2-25 hli los yog 5-30 hli feem. Cov pob loj loj yuav tsis yaj tag; undersized khoom yuav oxidize ua ntej reacting.

Tshaj tawm -Kev Tshawb Fawb Kev Kho Mob:Txhua qhov chaw tsim khoom yuav tsum txheeb xyuas cov lej los ntawm kev sim ua haujlwm:

• Spectrometer tsom xam rau cov magnesium seem (0.035-0.055% phiaj)
• Microstructure kuaj rau nodularity (Ntau dua lossis sib npaug li 80% feem ntau)
• Mechanical Properties Test rau validation
• Tsis tu ncua calibration ntawm cov khoom siv ntxiv

Cov ntaub ntawv:Cov ntaub ntawv ntxaws ntxaws ntawm cov hlau sulfur, kev kho kub,silicon magnesiumntxiv, thiab residual magnesium pab ua kom tsis tu ncua ntawm cov qauv kev suav rau cov txheej txheem tshwj xeeb.

✨ raug suav ntawmsilicon magnesium inoculantNtxiv cov nqi sib txuas ua ke nrog cov qauv kev tshawb fawb nrog kev paub txog txheej txheem. Los ntawm kev nkag siab txog cov qauv tseem ceeb, hloov kho txoj kev kho mob hloov pauv, suav nrog cov tshuaj sulfur thiab qhov kub thiab txias, thiab siv cov txheej txheem pov thawj, cov chaw tsim khoom tuaj yeem tsim cov khoom zoo siab - zoo ductile hlau thaum optimizingSiMgnoj. Qhov no systematic mus kom ze transformssilicon magnesiumNtxiv los ntawm kev twv ua haujlwm rau hauv cov txheej txheem metallurgical uas muaj peev xwm ua tau, tswj tau- lub hauv paus ntawm kev txhim khu kev qha nodular hlau ntau lawm.