Domestic roj av, tshuaj lom neeg thiab lwm yam kev lag luam hluav taws xob xav tau ntau cov hlau tsis muaj qhov kub thiab txias los tsim thiab tsim ntau yam kev tsim khoom thiab cia khoom xws li roj av liquefied, kua ammonia, kua oxygen thiab kua nitrogen.
Raws li Tuam Tshoj 12th Tsib Xyoo Plan, kev txhim kho ntawm petrochemical zog yuav ua kom zoo dua qub thiab kev txhim kho cov peev txheej roj thiab roj yuav nrawm dua hauv tsib xyoos tom ntej. Qhov no yuav muab kev lag luam dav dav thiab kev tsim kho lub sijhawm rau kev tsim hluav taws xob thiab cov khoom siv cia khoom tsim kev lag luam nyob rau hauv cov kev pab cuam kub kub, thiab tseem yuav txhawb txoj kev loj hlob ntawmQ355D tsis tshua muaj kub resistant lub rajcov ntaub ntawv. Raws li cov kav dej kub uas tsis tshua muaj siab xav tau cov khoom lag luam kom tsis txhob muaj lub zog siab xwb tab sis kuj muaj qhov kub thiab qhov kub tsis tshua muaj zog, cov kav dej kub qis yuav tsum muaj siab dua purity ntawm cov hlau, thiab nrog lub nplhaib sib piv ntawm qhov kub thiab txias, qhov purity ntawm cov hlau kuj siab dua. qw 355eultra-low kub square rajyog tsim thiab tsim. Lub billet steel tuaj yeem siv ncaj qha los ua seamless steel yeeb nkab rau Conveying qauv. Cov txheej txheem tsim khoom suav nrog peb lub ntsiab lus hauv qab no:
(1)Hluav taws xob arc rauv smelting: scrap steel thiab npua hlau yog siv los uaraw khoom, ntawm cov seem steel nyiaj rau 60-40% thiab npua hlau nyiaj rau 30-40%. Ua kom zoo dua ntawm qhov zoo ntawm cov alkalinity siab, tsis kub thiab siab hlau oxide ntawm ultra-high fais fab qib hluav taws xob arc rauv, qhov khaus khaus ntawm cov pa decarburization los ntawm cov phom pa oxygen rau ntawm phab ntsa ntawm lub cub tawg, thiab smelting thawj steel-ua dej. Nrog rau lub siab impedance thiab ultra-high fais fab qib hluav taws xob arc rauv, cov khoom tsis zoo phosphorus, hydrogen, nitrogen thiab non-metallic inclusions hauv cov hlau molten tuaj yeem raug tshem tawm zoo. End point carbon ntawm molten hlau nyob rau hauv hluav taws xob arc rauv <0.02%, phosphorus <0.002%; Sib sib zog nqus deoxidation ntawm molten hlau yog ua nyob rau hauv cov txheej txheem ntawm hluav taws xob rauv tapping, thiab A1 pob thiab carbasil ntxiv mus nqa tawm ua ntej deoxidation.
Cov ntsiab lus ntawm txhuas nyob rau hauv cov hlau molten yog tswj ntawm 0.09 ~ 1.4%, yog li ntawd Al203 inclusions tsim nyob rau hauv thawj molten steel muaj txaus floating lub sij hawm, thaum lub txhuas cov ntsiab lus ntawm lub raj billet steel tom qab LF refining, VD nqus tsev kho mob thiab nruam casting. ncav cuag 0.020 ~ 0.040%, uas zam qhov sib ntxiv ntawm Al203 tsim los ntawm txhuas oxidation nyob rau hauv cov txheej txheem LF refining. Nickel phaj accounting rau 25 ~ 30% ntawm tag nrho cov alloy yog ntxiv rau lub ladle rau alloying; Yog tias cov ntsiab lus carbon ntau dua 0.02%, cov ntsiab lus carbon ntawm ultra-low kub hlau tsis tuaj yeem ua tau raws li qhov xav tau ntawm 0.05 ~ 0.08%. Txawm li cas los xij, txhawm rau txo cov oxidation ntawm cov hlau molten, nws yog ib qho tsim nyog yuav tsum tswj cov pa oxygen siv ntawm lub tshuab hluav taws xob ntawm lub tshuab hluav taws xob cov phom phom kom tswj cov ntsiab lus ntawm cov hlau molten hauv qab 0.02%; Thaum cov ntsiab lus phosphorus sib npaug li 0.002%, phosphorus cov ntsiab lus ntawm cov khoom yuav ncav cuag ntau tshaj 0.006%, uas yuav ua rau kom muaj teeb meem cov ntsiab lus phosphorus cov ntsiab lus thiab cuam tshuam rau qhov kub-temperature toughness ntawm cov hlau vim dephosphorization ntawm phosphorus muaj slag. los ntawm hluav taws xob rauv tapping thiab ntxiv ntawm ferroalloy thaum lub sij hawm LF refining. Lub tapping kub ntawm hluav taws xob arc rauv yog 1650 ~ 1670 ℃, thiab eccentric hauv qab tapping (EBT) yog siv los tiv thaiv cov oxide slag nkag mus rau LF refining rauv.
(2)Tom qab LF refining, cov hlau feeder pub 0.20 ~ 0.25kg / t ntshiab CA hlau ntawm hlau kom denature cov impurities thiab ua rau cov inclusions nyob rau hauv lub molten hlau ua kheej kheej. Tom qab Ca kev kho mob, cov hlau molten yog tshuab nrog argon nyob rau hauv qab ntawm lub ladle rau ntau tshaj 18 feeb. Lub zog ntawm argon tshuab tuaj yeem ua rau cov hlau molten tsis raug, yog li cov khoom sib xyaw ua ke hauv cov hlau molten muaj lub sijhawm ntab txaus, txhim kho cov purity ntawm cov hlau, thiab txo cov kev cuam tshuam ntawm kheej kheej nrog rau qhov kub thiab txias cuam tshuam toughness. Kev pub mis ntawm cov hlau ntshiab CA yog tsawg dua 0.20kg / t steel, cov khoom siv tsis tuaj yeem ua tiav, thiab cov khoom noj ntawm Ca hlau yog ntau tshaj 0.25kg / t steel, uas feem ntau nce tus nqi. Tsis tas li ntawd, thaum lub sij hawm pub mis ntawm Ca kab loj, cov hlau molten boils hnyav, thiab qhov hloov pauv ntawm cov hlau molten ua rau cov hlau molten yuav nqus thiab oxidation theem nrab.
(3)VD nqus tsev kho mob: xa lf refined molten steel rau VD chaw nres tsheb rau kev kho lub tshuab nqus tsev, khaws lub tshuab nqus tsev hauv qab 65pa rau ntau tshaj 20 feeb kom txog thaum lub slag tsis foaming, qhib lub tshuab nqus tsev cover, thiab tshuab argon nyob rau hauv qab ntawm lub ladle rau static tshuab ntawm hlau molten.
Post lub sij hawm: Sep-02-2022
