DCov roj av hauv tsev, tshuaj lom neeg thiab lwm yam kev lag luam hluav taws xob xav tau ntau cov hlau kub qis los tsim thiab tsim ntau yam khoom siv tsim khoom thiab khaws cia xws li roj av liquefied, kua ammonia, kua oxygen thiab kua nitrogen.
Raws li Tuam Tshoj Txoj Kev Npaj Tsib Xyoo Thib 12, kev txhim kho lub zog petrochemical yuav raug ua kom zoo tshaj plaws thiab kev txhim kho cov roj thiab cov khoom siv roj yuav raug ua kom nrawm dua hauv tsib xyoos tom ntej. Qhov no yuav muab kev lag luam dav dav thiab lub sijhawm txhim kho rau kev tsim khoom siv hluav taws xob thiab kev tsim khoom siv khaws cia hauv qab qhov kub qis, thiab tseem yuav txhawb kev txhim kho ntawmQ355D tsis tshua muaj kub thiab tsis kam rau lub raj plaub fabcov ntaub ntawv. Raws li cov kav dej kub qis xav tau cov khoom tsis yog tsuas yog muaj zog siab xwb tab sis kuj muaj qhov kub siab thiab qis toughness, cov kav dej kub qis xav tau cov hlau purity siab dua, thiab nrog rau qhov sib piv ntawm qhov kub thiab txias, qhov purity ntawm hlau kuj siab dua. Q355ELub raj xa dej kub tsawg heevtau tsim thiab tsim. Cov hlau billet tuaj yeem siv ncaj qha ua cov yeeb nkab hlau seamless rau kev xa khoom. Cov txheej txheem tsim khoom suav nrog peb lub ntsiab lus hauv qab no:
(1)Kev siv hluav taws xob arc rauv taws xob smelting: cov hlau seem thiab cov hlau npua yog siv uacov khoom siv raw, ntawm cov hlau seem suav txog 60-40% thiab hlau npua suav txog 30-40%. Siv qhov zoo ntawm cov alkalinity siab, kub qis thiab hlau oxide siab ntawm lub zog siab ultra-high fais fab arc cub tawg, qhov kev sib xyaw ua ke ntawm cov pa oxygen decarburization los ntawm rab phom oxygen bundle rau ntawm phab ntsa cub tawg, thiab smelting cov dej ua hlau pib nrog lub impedance siab thiab ultra-high fais fab qib hluav taws xob arc cub tawg, cov ntsiab lus tsis zoo phosphorus, hydrogen, nitrogen thiab cov khoom tsis yog hlau hauv cov hlau molten tuaj yeem tshem tawm tau zoo. Qhov kawg ntawm cov hlau molten hauv lub zog hluav taws xob arc cub tawg <0.02%, phosphorus <0.002%; Kev sib sib zog nqus deoxidation ntawm cov hlau molten yog nqa tawm hauv cov txheej txheem ntawm lub zog hluav taws xob tapping, thiab A1 pob thiab carbasil raug ntxiv rau kev ua ntej deoxidation.
Cov ntsiab lus txhuas hauv cov hlau molten raug tswj ntawm 0.09 ~ 1.4%, yog li ntawd Al203 cov khoom suav nrog tsim nyob rau hauv cov hlau molten thawj zaug muaj lub sijhawm ntab txaus, thaum cov ntsiab lus txhuas ntawm cov hlau billet tom qab LF refining, VD vacuum treatment thiab tas mus li casting ncav cuag 0.020 ~ 0.040%, uas zam kev ntxiv ntawm Al203 tsim los ntawm txhuas oxidation hauv LF refining txheej txheem. Lub phaj nickel suav rau 25 ~ 30% ntawm tag nrho cov hlau alloy yog ntxiv rau lub ladle rau alloying; Yog tias cov ntsiab lus carbon ntau dua 0.02%, cov ntsiab lus carbon ntawm cov hlau kub qis heev tsis tuaj yeem ua tau raws li qhov xav tau ntawm 0.05 ~ 0.08%. Txawm li cas los xij, txhawm rau txo qhov oxidation ntawm cov hlau molten, nws yog qhov tsim nyog los tswj qhov muaj zog oxygen ntawm lub cub tawg phab ntsa cluster oxygen phom kom tswj cov ntsiab lus carbon ntawm cov hlau molten hauv qab 0.02%; Thaum cov ntsiab lus phosphorus sib npaug rau 0.002%, cov ntsiab lus phosphorus ntawm cov khoom yuav ncav cuag ntau dua 0.006%, uas yuav ua rau cov ntsiab lus phosphorus tsis zoo nce ntxiv thiab cuam tshuam rau qhov kub qis ntawm cov hlau vim yog qhov dephosphorization ntawm cov phosphorus uas muaj slag los ntawm lub tshuab hluav taws xob tapping thiab ntxiv cov ferroalloy thaum lub sijhawm LF refining. Qhov kub tapping ntawm lub tshuab hluav taws xob arc yog 1650 ~ 1670 ℃, thiab eccentric bottom tapping (EBT) yog siv los tiv thaiv cov oxide slag los ntawm kev nkag mus rau hauv lub tshuab hluav taws xob LF refining.
(2)Tom qab LF refining, lub tshuab pub hlau pub 0.20 ~ 0.25kg/t ntshiab CA hlau ntawm cov hlau kom denatured cov impurities thiab ua rau cov inclusions hauv cov hlau molten ua spherical. Tom qab Ca kho, cov hlau molten raug tshuab nrog argon ntawm 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 spherical inclusions hauv cov hlau molten muaj lub sijhawm ntab txaus, txhim kho qhov huv ntawm cov hlau, thiab txo qhov cuam tshuam ntawm cov spherical inclusions rau qhov kub qis qis cuam tshuam toughness. Tus nqi pub ntawm cov hlau CA ntshiab yog tsawg dua 0.20kg/t hlau, cov inclusions tsis tuaj yeem denatured tag nrho, thiab tus nqi pub ntawm Ca hlau yog ntau dua 0.25kg/t hlau, uas feem ntau ua rau tus nqi nce. Tsis tas li ntawd, thaum tus nqi pub ntawm Ca kab yog loj, cov hlau molten boils hnyav, thiab qhov kev hloov pauv ntawm cov hlau molten ua rau cov hlau molten raug sucked rau hauv thiab oxidation theem ob tshwm sim.
(3)Kev kho cua sov VD: xa cov hlau uas tau ua kom huv mus rau chaw nres tsheb VD rau kev kho cua sov, khaws lub tshuab nqus tsev hauv qab 65pa rau ntau tshaj 20 feeb kom txog thaum cov slag tsis ua npuas, qhib lub hau nqus tsev, thiab tshuab argon rau hauv qab ntawm lub ladle rau kev tshuab cua sov ntawm cov hlau uas tau ua kom huv.
Lub sijhawm tshaj tawm: Cuaj hlis-02-2022
