Nrog rau kev tshawb fawb tob zuj zus mus, qhov qis-kub casting billet cua sov thev naus laus zis yuav txhawb nqa ntau dua thiab siv tau, uas yuav ua lub luag haujlwm zoo hauv kev txhawb nqa kev tsim khoom thiab kev tsim kho.oriented silicon hlau.
Nyob rau hauv xyoo tas los no, loj oriented silicon steel ntau lawm cov nroj tsuag nyob rau hauv lub ntiaj teb no tau txuas tseem ceeb heev rau kev txhim kho cov txheej txheem casting billet cua sov. Cov txheej txheem kub-kub rauv cua sov txheej txheem tau hloov los ntawm cov cua sov taug kev zoo tib yam + lub tshuab hluav taws xob ntau zaus induction rauv high-temperature luv luv cua sov. Xyoo 1996, Nippon Steel's Bapan Plant tau siv 1150 ~ 1250 degree qis kub casting billet cua sov txheej txheem los tsim Hi-B steel; Russia tau siv 1250 ~ 1280 degree slab cua sov txheej txheem los tsim CGO hlau. Hauv kev lag luam hlau thiab hlau niaj hnub no, uas tau nce zuj zus mus rau kev txuag hluav taws xob, kev tiv thaiv ib puag ncig thiab txo tus nqi, cov txheej txheem qis-kub casting billet cua sov yuav muaj tseeb tau siv dav hauv kev tsim cov roj silicon steel.
Oriented silicon steel siab kub casting billet cua sov tshuab
Nyob rau hauv cov txheej txheem ntau lawm ntawm oriented silicon steel, nyob rau hauv thiaj li yuav tau txais ib tug Goss zoo nkauj los ntawm theem nrab recrystallization, cov nplua thiab dispersed precipitated theem hais los yog grain ciam ciam cais cov ntsiab lus uas yuav zoo inhibit qhov kev loj hlob ntawm cov thawj nplej yog hu ua inhibitors. Cov teebmeem kev sib deev. Txhawm rau kom muaj cov khoom sib nqus ruaj khov, cov ntxhib MnS cov khoom ua los ntawm cov txheej txheem casting thiab condensation yuav tsum tau yaj tag. Yog li ntawd, cov cua kub ntawm CGO steel casting billet nrog MnS raws li inhibitor yog teev raws li 1350-1370 degree , thiab cov cua kub ntawm Hi-B steel nrog MnS + AlN li inhibitor yog siab dua CGO hlau vim ntau dua manganese thiab carbon. cov ntsiab lus tshaj CGO steel. Cov cua kub kub tau teev tseg raws li 1380-1400 degree . Thaum lub cam khwb cia slab yog rhuab ntawm qhov kub siab tshaj 1350 degree, lub coarse MnS hais yog kiag li yaj thiab ces precipitated nyob rau hauv ib tug finely dispersed lub xeev thaum lub sij hawm kub dov txheej txheem. Qhov zoo tshaj plaws dispersed AlN hais feem ntau yog precipitated thaum lub sij hawm normalization txheej txheem ntawm cov ntawv kub dov. Qhov tsim nyog thawj zaug loj tom qab decarburization annealing rau CGO steel yog 15-25 μm, thiab rau Hi-B steel yog 10-15 μm. Qhov no tuaj yeem ua kom ntseeg tau tias qhov thib ob recrystallization tiav thiab cov khoom sib nqus siab tuaj yeem tau txais. Txawm li cas los xij, cua sov ntawm high-temperature cam khwb cia slab muaj qhov tsis zoo hauv qab no:
Tus nqi tawm los yog txo: qhov kub poob tau nce (3.5%-6%) vim yog oxidation ntau dhau ntawm cov cam khwb cia, uas yog li 4 npaug siab dua cov cua kub kub poob ntawm cov pa roj carbon zoo tib yam;
(1) Slag tsub zuj zuj nyob rau hauv qab ntawm lub cub tawg thiab cov zis tsawg: lub melting point ntawm lub tsim SiO2 oxide txheej tsuas yog 1205 degree, yog li cov oxide txheej melts nyob rau hauv lub high-kub cua sov rauv thiab ntws mus rau hauv qab ntawm lub cub tawg. Qhov nruab nrab cua sov ntawm 4 000 billets yuav tsum tau ntxuav cov slag thiab cua sov. Txog 8,000 yuav raug kho dua tshiab, thiab cov kev ua haujlwm rau kev kho lub cub tawg yog qhov tsis zoo;
(2) Lub zog pov tseg: Feem ntau yog vim qhov kub thiab txias, kev siv roj ntau ntxiv;
(3) Lub neej ua kom luv luv: Lub hauv paus refractory nyob rau hauv qhov chaw kub kub ntawm lub qhov cub cua sov uas tau raug kub thiab cua sov rau lub sijhawm ntev yuav raug tev tawm thiab lub neej yuav luv, uas tsis yog tsuas yog txhim kho kev txij nkawm. cov nqi, tab sis kuj txo cov nqi hluav taws xob ua haujlwm;
(4) Cov nqi tsim khoom siab: vim yog coarsening ntawm slab lis thiab oxidation ntawm ntug nplej ciam teb, cov kub dov sawb yog feem ntau ua rau ntug tawg, tus nqi tawm los yog txo, thiab cov nqi tsim khoom tsuas yog muaj zog;
(5) Ntau yam khoom nto tsis xws luag: tsis zoo tshem tawm oxide nplai nyob rau saum npoo ntawm kub dov strip steel, uas cuam tshuam rau lub cev zoo ntawm cov khoom;
(6) Cov khoom sib nqus tsis ruaj khov: aluminium, silicon thiab carbon nyob rau hauv qhov chaw ntawm cov cam khwb cia slab yog ua ke nrog oxidation, txo cov ntsiab lus, ua rau cov khoom sib nqus tsis sib xws ntawm cov khoom thiab kev puas tsuaj ntawm cov yeeb yaj kiab insulating;
(7) Tsis tas li ntawd, vim yog coarsening ntawm slab nplej, cov khoom yog nquag mus rau linear zoo siv lead ua tsis xws luag, uas cuam tshuam rau cov hlau nplaum stability.
Tam sim no, cov txheej txheem dav dav rau cov cua kub kub cam khwb cia slabs yog raws li nram no: cov cam khwb cia slabs yog thawj preheated nyob rau hauv ib tug zoo tib yam cua sov rauv ntawm 1200 degree, thiab ces nkag mus rau hauv ib tug high-frequency induction rauv rau high-temperature thiab luv-lub sij hawm. cua sov. Cov txheej txheem no siv lub zog tsawg dua li cov txheej txheem kub kub cua kub cua sov, lub tshuab ua kom sov lub cev muaj lub neej ua haujlwm ntev, txo qis slag tsub zuj zuj thiab kub dov ntug tawg, thiab txo cov nqi tsim khoom.
Oriented silicon steel qis kub casting billet cua sov tshuab
Vim yog cov lus hais saum toj no qhov tsis txaus ntawm qhov kub-kub casting billet cua sov thev naus laus zis, thiab nws tsis yog qhov tsim nyog rau kev siv cov khoom siv silicon steel thiab lwm qib steel los qhia cov kab kub dov ntau lawm, nws yog ib qho tsim nyog yuav tsum tau txo qhov kub ntawm billet. . Txhawm rau kom ua tiav qhov ntsuas kub qis qis, MnS yuav tsum raug tshem tawm lossis cov nyhuv ntawm MnS tsis muaj zog yuav tsum raug tshem tawm los ntawm cov inhibitor, thiab AlN, Cu2S, thiab lwm yam yuav tsum tau siv los hloov. Qhov no feem ntau yog vim tias cov kua dej kub ntawm AlN thiab Cu2S qis dua li ntawm MnS, uas yog qhov tsim nyog rau cov cua kub tsawg. Tam sim no, feem ntau yog ob yam ntawm cov txheej txheem uas tsis kub-kub casting billet cua sov txheej txheem siv nyob rau hauv kev lag luam: ib tug yog tus inhibitor (hu ua innate inhibitor) tsim nyog rau kev tsim ntawm theem nrab recrystallization ua ntej txias dov, thiab lwm yam yog decarburization annealing Tom qab nitriding. , cov nitrogen yog ua ke nrog cov thawj txhuas nyob rau hauv cov hlau los tsim zoo thiab dispersed (Al, Si) N hais, thiab cov inhibitor tsim nyog rau theem nrab recrystallization (hu ua acquired inhibitor) yog tau. Thaum lub sij hawm kho nitriding, tus nqi ntawm nitriding yog tswj ntawm (150-300) X10-6, thiab qhov nruab nrab grain loj ntawm cov thawj nplej tom qab decarburization annealing yog tswj ntawm 18 ~ 30μm, txhawm rau kom tau txais cov qauv zoo meej thib ob recrystallized thiab tau txais tus nqi siab B800. Nitriding kev kho thiab decarburization annealing yog ua nyob rau hauv tib lub nruam annealing rauv, uas yog, tom qab decarburization annealing, cov hlau strip hla H2+N2+NH (cov roj sib xyaw, tswj cov oxidation tus nqi PH2O / PH2 Tsawg dua los yog sib npaug ntawm 0.04. Tsis tas li ntawd, nws kuj tseem siv tau rau hauv Cov txheej txheem ntawm kev ntxiv nitride thaum txheej MgO tso tawm tus neeg sawv cev rau saum npoo ntawm cov hlau phaj kom ua tiav lub hom phiaj ntawm nitriding. Cov txheej txheem nitriding tuaj yeem txo cov cua sov. ntawm cam khwb cia slab rau 1150-1200 degree .
Kev siv cov innate inhibitors los tsim CGO steel thiab siv ob qho tib si innate inhibitors thiab tau txais inhibitors los tsim Hi-B steel yog lwm txoj hauv kev zoo los txo cov cua sov ntawm cov cam khwb cia. Cov cua kub ntawm cov cam khwb cia slab tuaj yeem tswj tau ntawm 1250 txog 1300 degree.
Nyob rau hauv cov ntsiab lus, oriented silicon steel tam sim no feem ntau muaj cov nram qab no ob yam tsawg-kub casting billet cua sov txheej txheem:
(1) Cov txheej txheem nitriding lig: tsuas yog ib qho me me ntawm txhuas ntxiv thaum lub sij hawm steelmaking, uas yog siv los tsim Hi-B oriented silicon steel. Nws muaj pes tsawg leeg yuav tsum tau S loj feem<0.007%, and nitriding treatment is carried out after decarburization annealing. The main feature of this process is that the steel strip needs to be nitrided at 750 ℃ X 30s after decarburization annealing. (Al, Si) N particles are formed during the high temperature annealing and heating process, which hinders the growth of the primary grains before the secondary recrystallization occurs. The proper size of the primary grains after decarburization annealing is 18-30 μm (larger than the primary grain size of the high-temperature casting billet heating process). This process can reduce the slab heating temperature to 1150-1200℃, which is the lowest temperature used for slab heating in the current industrial production of oriented silicon steel;
(2) Cu2S innate inhibitor txheej txheem: Cu2S yog lub ntsiab inhibitor nyob rau hauv zus tau tej cov CGO steel, thiab Cu2S yog rhuab ntawm 1250 mus rau 1300 degree kom tiav cov khoom tiav. Cov nplua thiab tawg Cu2S cov khoom ua rau lub sijhawm kub dov ua inhibitors, thaum cov ntxhib MnS seem hauv cov ntawv kub dov tsis ua. Thawj qhov loj me yog nyob nruab nrab ntawm cov txheej txheem kub-kub slab cua sov thiab cov txheej txheem cua kub qis (15-25μm). Hauv kev tsim cov Hi-B steel, MnS + AlN yog siv los ua tus inhibitor. Cov ntawv kub dov feem ntau yog kho kom ua rau cov hmoov zoo AIN. Tom qab decarburization thiab annealing, nitriding feem ntau yog siv los ntxiv dag zog rau kev muaj peev xwm tiv thaiv. Cov tshuab no tuaj yeem txo cov cua kub ntawm cov cam khwb cia rau 1250 txog 1300 degree.
Xaus
Nws yog undeniable hais tias lub high-temperature billet cua sov tshuab yog ib qho tseem ceeb nyob rau hauv lub keeb kwm ntawm kev loj hlob ntawm oriented silicon steel. Nws yog cov txheej txheem paub tab uas tuaj yeem ruaj khov kom tau txais cov khoom sib nqus siab tom qab tib neeg tau paub txog lub luag haujlwm ntawm inhibitors. Txawm li cas los xij, nyob rau xyoo tas los no, nrog rau qhov tsis txaus ntawm cov khoom siv hluav taws xob ntau ntxiv thiab cov kev xav tau ntau ntxiv rau kev tiv thaiv ib puag ncig thiab txo tus nqi, qhov tsis zoo ntawm cov cua kub cua sov tau dhau los ua qhov tseem ceeb. Txo cov cua kub ntawm cov slabs tau dhau los ua qhov kev txhawj xeeb ntawm cov tuam txhab tseem ceeb ntawm silicon steel hauv ntiaj teb. Technology txhim kho hotspots. Nrog rau kev tshawb fawb tob zuj zus mus, qhov qis-kub casting billet cua sov thev naus laus zis yuav txhawb nqa ntau dua thiab siv tau, uas yuav ua lub luag haujlwm zoo hauv kev txhawb nqa kev tsim khoom thiab kev txhim kho ntawm kev taw qhia silicon steel.
Cold rolled Grain Non oriented silicon steel
