Lub hom phiaj tseem ceeb ntawm qhov txias-kuav los tiag taw qhiahluav taws xob hlaukev tsim khoom yog los xyuas kom meej cov khoom zoo thiab tau txais cov khoom uas ua tau raws li qhov yuav tsum tau ua thiab cov kev cai. Lwm txoj haujlwm ntawm kev tsim hluav taws xob steel yog siv zog ua kom cov zis ntau ntxiv. Kev ua tiav ntawm txoj haujlwm no tsis tsuas yog nyob ntawm qhov laj thawj ntawm cov txheej txheem tsim khoom, tab sis kuj yog nyob ntawm kev siv tag nrho ntawm lub sijhawm thiab cov khoom siv thiab kev ua haujlwm zoo ntawm tus neeg teb xov tooj. Tsis tas li ntawd, kev siv zog los txo cov nqi thaum txhim kho cov khoom tsim tawm thiab zoo.
Lub koom haum tsim khoom ntawm oriented hluav taws xob steel suav nrog lub koom haum thiab kev npaj cov khoom siv raw, siv thiab tu cov cuab yeej, thiab kev tsim cov kev cai. Ntau yam txias-dov oriented hluav taws xob steels muaj cov txheej txheem ntau lawm thiab kev ua haujlwm raws li lawv cov kev siv sib txawv. Cov hauv qab no yog cov lus qhia luv luv rau cov cuab yeej tsim khoom tam sim no ntawm txias-dov taw qhia hluav taws xob hlau hauv tsev thiab txawv teb chaws.
Kev tsim cov khoom txias-kuav los tiagtaw qhia hluav taws xob hlausuav nrog thawj qhov txias dov thiab theem nrab txias dov. Qhov thib ob txoj kev txias dov feem ntau yog siv los tsim cov qib dav dav ntawm cov khoom siv hluav taws xob hlau. Nws muaj cov kub-kuav los tiag strip txias dov mus rau nruab nrab thickness thiab annealing, thiab ces theem nrab txias dov mus rau qhov kawg thickness thiab zaum kawg annealing. Ib qho ntawm nws cov yam ntxwv tseem ceeb yog siv MnS lossis MnSe ua ib qho kev txhawb nqa los txhawb kev loj hlob ntawm thawj cov nplej; nws qhov thib ob qhov tseem ceeb yog siv txias dov ntawm qhov nruab nrab txo tus nqi los ua ib qho kev ntxhib los mos (111) [112]. Thawj txoj kev txias dov yog ib txoj kev siv los tsim cov hlau nplaum sib nqus induction oriented hluav taws xob hlau. Nws yog kom txias-yob lub kub-kuav los tiag sawb hlau kom tiav thickness tom qab normalization kev kho mob, thiab ces ua decarburization annealing. Nws cov yam ntxwv ntau lawm yog: ① siv AlN + MnS (tsuas yog AlN) raws li cov khoom muaj txiaj ntsig zoo los tiv thaiv kev loj hlob ntawm thawj cov nplej thiab txhawb kev loj hlob ntawm (110) [001] nplej; ② tsim ntawm qhov txo qis ntawm 85% Txias dov deformation kev ntxhib los mos ntawm recrystallized (110) [001].
Cov teeb meem thiab cov ntsiab lus tseem ceeb hauv cov txheej txheem tsim hluav taws xob cov hlau
1) Ib qho ntawm cov teeb meem hauv smelting yog qhov nqaim ntawm kev tswj cov khoom.
Qhov tso cai hloov pauv ntawm qhov muaj pes tsawg leeg yog nqaim ntau dua li qhov sib xyaw ntawm cov pa roj carbon zoo tib yam thiab txias-dov nyias phaj hlau. Tshwj xeeb tshaj yog cov thinner lub phaj, qhov nqaim ntawm cov khoom muaj pes tsawg leeg dhau los, uas yog qhov nyuaj rau kev ua tiav siv cov txheej txheem smelting txheej txheem thiab cov txheej txheem tshuaj xyuas. Kev hloov pauv hauv cov khoom xyaw ncaj qha cuam tshuam rau tus kheej cov txheej txheem thiab kev ua haujlwm ntawm cov khoom kawg. Kev tswj cov khoom siv feem ntau yog ua los ntawm kev siv lub tshuab nqus tsev refining, uas suav nrog qhov hnyav ntawm cov alloys thiab kev soj ntsuam ceev thiab raug ntawm cov khoom. Txo cov kev hloov pauv ntawm cov khoom lag luam suav nrog tag nrho cov txheej txheem ntawm steelmaking thiab nruam casting, tshwj xeeb tshaj yog cov txheej txheem refining thiab nruam casting txheej txheem.
2) Qhov nyuaj thib ob hauv kev smelting yog kev tswj ntawm purity.
Purity tswj tsis tau tsuas yog txo cov oxide inclusions, tab sis kuj txo cov ntsiab lus NB, V, Ti uas tsim cov carbides ruaj khov thiab cov ntsiab lus uas tsim sulfides, xws li Mg thiab Ca. Cov ntsiab lus no ncaj qha cuam tshuam rau tus cwj pwm nag lossis daus ntawm tus inhibitor. Cov ntsiab lus no tsuas yog coj mus rau hauv cov hlau molten nrog rau cov khoom seem hlau, ferroalloys thiab cov ntaub ntawv refractory. Kev yuav khoom thiab kev tswj xyuas cov khoom siv raw thiab cov khoom pabcuam no yuav tsum muaj zog ntxiv.
3) Qhov thib peb nyuaj ntawm smelting yog cov khoom sib cais ntawm cov slab thiab cov kab nrib pleb hauv cov slab.
Vim muaj cov ntsiab lus sulfur siab thiab tsis tshua muaj manganese cov ntsiab lus ntawm cov nplej-taw qhia cov hluav taws xob hlau, cov cam khwb cia slab yog qhov ua rau sab hauv tawg thiab sib cais. Qhov kev daws teeb meem yog los siv cov kev ntsuas xws li qis superheat casting, electromagnetic stirring thiab lub teeb nias ntawm lub slab, thiab tsis tu ncua kho cov xwm txheej ntawm lub tshuab casting kom txo qhov nruab nrab segregation thiab sab hauv cracking los ntawm siab sulfur, thiab txo cov columnar siv lead ua piv.
4) Qhov nyuaj ntawm cov txheej txheem kub dov yog qhov kub-kub ntawm cov slab.
Txhawm rau kom yaj tag nrho cov inhibitors xws li MnS thiab AlN, tshwj xeeb tshaj yog MnS, cam khwb cia slab yuav tsum tau rhuab ntawm qhov kub thiab txias rau ib lub sij hawm, uas yooj yim ua rau oxidation thiab burning poob ntawm cov cam khwb cia slab. Nippon Steel Co., Ltd. tshuaj tua kab mob antioxidants rau saum npoo ntawm cam khwb cia slabs nrog kub siab tshaj 300 degree ua ntej cua sov rau hauv lub cub tawg. Txhawm rau tiv thaiv cov kab nrib pleb uas tsim los ntawm cov cua kub kub thiab txhim kho qhov zoo ntawm cov khoom, Kawasaki Steel Co., Ltd. sprays MoO3 los yog CaMoO4 aqueous tov rau saum npoo ntawm cam khwb cia slabs nrog kub siab tshaj 500 degree. Kev coj ua ntawm qee cov tuam txhab lag luam yog cov txheej txheem cam khwb cia nrog cov tshuaj tiv thaiv oxidation ua ntej nkag mus rau hauv qhov cub.
5) Lub hom phiaj ntawm cov txheej txheem txias dov yog kub kub annealing.
Rau cov khoom siv hluav taws xob dav dav dav hlau, txhawm rau kom tau txais txiaj ntsig zoo (110)[001] kev taw qhia cov nplej, yuav tsum siv cov cua sov qeeb qeeb kom ntseeg tau tias (110)[001] cov nplej nrog cov kev taw qhia zoo loj hlob zoo dua thiab kev tsim kho theem nrab tshwm sim. crystallization. Rau Hi-B steel, qhov kub thiab cua ntawm txhua theem ntawm cov txheej txheem kub-kub annealing yuav tsum tau tswj xyuas kom muaj hlau nplaum thiab tsim cov txheej txheem hauv qab zoo.
Tsawg-kub cua sov txheej txheem nyob rau hauv grain-oriented hluav taws xob hlau
Txo cov cua kub ntawm cov nplej-taw qhia cov hluav taws xob steel slabs muaj qhov zoo ntawm kev zam kom tsis txhob tsim cov kua slag, txo kev txij nkawm ntawm cov cua sov rauv, kom tau txais cov hlau ntau dua, thiab tiv thaiv qhov tsis zoo ntawm cov nplej coarsening nyob nruab nrab ntawm cov slab. Nyob rau hauv xyoo tas los no, thaum tib neeg tab tom kawm txog qhov kub thiab txias ntawm cov slabs, txhawm rau ua kom lub zog ntawm cov inhibitor, lwm yam tshuaj uas tsis yog manganese sulfide, xws li nitrides thiab grain ciam teb precipitated ntsiab, tau ntxiv los ntxiv dag zog rau cov inhibitor.
Cov kua dej kub ntawm aluminium nitride yog qis dua li ntawm manganese sulfide, yog li nws yog qhov tsim nyog rau cov cua kub qis. Tam sim no, txoj kev tsim khoom lag luam siv cov txheej txheem cua kub qis ntawm cov slabs yog siv aluminium nitride ua tus inhibitor thiab ua nitriding kev kho mob ua ntej pib ntawm theem nrab recrystallization, los yog siv aluminium nitride ua lub ntsiab inhibitor thiab Cu2S thiab manganese sulfide li. tus inhibitor. Pab inhibitors. Cov txheej txheem yog nitride cov hlau los ua ke nrog cov khoom qub hauv cov hlau los tsim cov txhuas nitride precipitates nrog inhibitor functions. Raws li cov tshuaj txhuas nitride, cov cua kub ntawm cov slab tuaj yeem txo qis rau 1150~12{14}}0 degree . Txhawm rau kom tau txais cov qauv ua tiav theem nrab recrystallization, siab hlau nplaum thiab iav zaj duab xis zoo, sib xyaw ua ke kev hloov kho thiab kev txhim kho cov txheej txheem yuav tsum tau ua. Cov yam ntxwv ntawm cov txheej txheem Hi-B tshiab kawm los ntawm Nippon Steel yog: siv aluminium nitride ua ib qho inhibitor, slab cua sov kub yog qis dua rau 1150 ~ 1250 degree, thiab tom qab decarburization thiab annealing, nitriding kev kho mob yog nqa tawm nyob rau hauv ib tug H{{ 8}}N2 huab cua muaj NH3. Txoj kev txias txias ib zaug tuaj yeem tsim cov khoom nrog lub thickness ntawm 0.18 ~ 0.50mm, thiab nws yooj yim dua los ua cov khoom tshiab yam tsis muaj iav zaj duab xis. Sumitomo Hlau tau thov kom muaj cov pa roj carbon tsawg 1.5% Mn-2.2% Si taw qhia cov txheej txheem hluav taws xob hlau siv txhuas nitride ua tus inhibitor los txo cov slab cua sov. South Kauslim lub tuam txhab Pohang Steel tau npaj cov txheej txheem los tsim cov khoom siv hluav taws xob dav dav thiab cov hlau nplaum sib nqus induction oriented hluav taws xob siv aluminium nitride ua lub ntsiab inhibitor, Cu2S thiab manganese sulfide ua auxiliary inhibitors, thiab cua sov lub slab ntawm 1250 txog 1320 degree.
