Q: Lub hom phiaj tseem ceeb ntawm annealing hauv galvanized coil yog dab tsi?
A: Annealing ntawm galvanized coils muaj ob lub hom phiaj tseem ceeb. Ua ntej, nws restores lub plasticity ntawm cov hlau tom qab txias dov thiab tshem tawm ua hauj lwm hardening. Thaum lub sij hawm dov txheej txheem, txias-rolled strip steel raug kev txom nyem loj lattice distortion, uas ua rau muaj zog thiab hardness, tab sis txo plasticity. Annealing tso cai rau recrystallization ntawm cov nplej, txo cov yield zog thiab hardness, nce elongation, thiab pab txhawb cov txheej txheem tom ntej. Qhov thib ob, nws npaj qhov chaw huv si rau kub -dip galvanizing. Cov txheej txheem annealing yog nqa tawm nyob rau hauv ib qho chaw tiv thaiv, uas txo cov seem hlau oxide nplai ntawm lub strip nto, tau ib tug huv si thiab activated hlau matrix, kom ntseeg tau zoo wetting thiab bonding ntawm zinc da dej.
Q: Yuav ua li cas annealing cuam tshuam rau adhesion thiab alloy txheej txheej txheem ntawm galvanized txheej?
A: Cov txheej txheem annealing ncaj qha txiav txim siab cov hlau -zinc cov tshuaj tiv thaiv thaum lub sij hawm galvanizing. Nyob rau hauv tas li kub -dip galvanizing, lub annealed strip yog immersed nyob rau hauv molten zinc ntawm qhov tsim nyog kub (kwv yees li 460 mus rau 480 degrees Celsius), qhov twg cov hlau substrate thiab zinc undergo ib tug diffusion cov tshuaj tiv thaiv los ua ib tug hlau{5}}zinc alloy txheej. Yog hais tias annealing tsis txaus los yog lub qhov cub cua kub tswj tsis tau zoo, oxide zaj duab xis yuav nyob twj ywm rau ntawm daim tawv nqaij, cuam tshuam cov hlau -zinc cov tshuaj tiv thaiv thiab ua rau tsis tiav galvanizing los yog coated adhesion. Kev tswj xyuas qhov kub thiab txias thiab lub sijhawm tuaj yeem kho qhov tuab thiab ntom ntawm cov hlau -zinc alloy txheej, ua kom muaj adhesion txaus thaum tsis txhob muaj txheej txheej tuab tuab heev uas ua rau kom brittleness thiab ua rau hmoov thiab tev tawm thaum ua haujlwm.
Q: Dab tsi tshwj xeeb kev pab cuam annealing ua rau cov neeg kho tshuab thiab ua cov khoom ntawm galvanized coils?
A: Tom qab recrystallization annealing, cov qauv nplej ntawm galvanized coil hloov los ntawm zoo fibrous txias -rolled qauv rau equiaxed nplej, thiab qhov dislocation ceev yog txo. Qhov no ua rau qhov txo qis ntawm qhov tawm los thiab lub zog tensile ntawm cov khoom, thaum ua kom tag nrho elongation thiab uniform elongation. Kev ua hauj lwm hardening Performance index (n) thiab yas strain ratio (r) kuj optimized. Tshwj xeeb, qhov no ua rau muaj kev tawg tsawg thaum lub sij hawm stamping, txhim kho formability ntawm qhov chaw nrog cov duab nyuaj, tsis tshua muaj kev cuam tshuam rau kev tawg thaum khoov, thiab txo cov anisotropy ntawm cov khoom. Qhov no yog qhov tseem ceeb heev rau kev tsim cov khoom uas xav tau kev kos duab sib sib zog nqus, xws li tsheb lub cev vaj huam sib luag thiab cov khoom vaj khoom tsev. Galvanized coils uas tsis tau ua kom zoo annealing pom kev ua haujlwm hnyav thiab tsis muaj kev txwv, txwv lawv siv rau kev khoov yooj yim lossis cov khoom siv.
Q: Dab tsi yog qhov tseem ceeb tswj qhov feem ntau cuam tshuam rau hauv cov txheej txheem annealing nyob rau hauv ib tug nruam kub -dip galvanizing ntau lawm kab?
A: Nruam kub -dip galvanizing annealing rauv feem ntau muab faib ua preheating, cua sov, soaking, thiab txias seem. Cov kev tswj xyuas tseem ceeb muaj xws li: qhov dej lwg ntawm qhov cub cua sov (feem ntau yuav tsum tau qis dua -40 degree), cov ntsiab lus hydrogen hauv hydrogen-nitrogen sib tov (5% mus rau 10%), qhov kub thiab txias ntawm txhua ntu (feem ntau cua sov feem ntau 700 txog 850℃, soaking seem 600 mus rau 70℃qhov kub ntawm lub lauj kaub rau 70 degree. precisely tswj nyob ze ntawm zinc da dej kub), thiab cua sov tswj nro. Tsis tas li ntawd, qhov cua thiab qhov kub thiab txias ntawm lub qhov cub qhov ntswg (qhov kev sib txuas ntawm lub cub tawg thiab lub lauj kaub zinc) yuav tsum ruaj khov kom tsis txhob muaj cov kab nrib pleb los ntawm re{13}}oxidizing ua ntej nkag mus rau hauv zinc da dej. Cov kab ntau lawm niaj hnub siv cov qauv kev ua lej thiab kev kaw lub voj kaw kom ntseeg tau tias qhov kub thiab txias tsis sib xws thiab huab cua ruaj khov nyob rau tag nrho qhov ntev ntawm cov sawb.
Q: Dab tsi raug mob lossis teeb meem zoo yuav tshwm sim hauv galvanized coils yog tias cov txheej txheem annealing tsis raug?
A: Kev ua kom tsis zoo tuaj yeem ua rau muaj ntau yam tsis xws luag. Ua ntej, tsis txaus annealing tawm cov seem hlau oxide nplai los yog roj rau ntawm cov kab nrib pleb, tiv thaiv cov zinc da dej los ntawm ntub nws thiab ua rau cov hlau raug (tsis muaj coated) me ntsis thiab streaks. Qhov thib ob, qhov kub thiab txias ntau dhau los yog lub sij hawm ntev annealing tuaj yeem ua rau kev loj hlob tsis zoo, ua rau lub zog tsis muaj zog ntawm cov galvanized coil thiab ua rau nws yooj yim rau cov txiv kab ntxwv tev los yog hlais kab thaum lub sij hawm stamping; tib lub sijhawm, cov hlau tuab heev -zinc alloy txheej tuaj yeem ua rau cov hmoov txheej thiab tev tawm thaum khoov. Qhov thib peb, qhov dej lwg siab nyob rau hauv lub qhov cub cua tuaj yeem ua rau tsim cov txheej txheem oxide tsis tuaj yeem (xws li oxides ntawm manganese, silicon, thiab lwm yam) ntawm cov kab nrib pleb, thaum kawg ua rau cov txheej txheem tsis zoo thiab tev tawm thaum tsim. Tsis tas li ntawd, qhov tsis tsim nyog qhov txias txias tom qab annealing tuaj yeem cuam tshuam rau lub xeev nag lossis daus ntawm cov pa roj carbon atoms, yog li txo cov khoom tiv thaiv kev laus thiab ua rau lub hnub nyoog hardening thaum khaws cia tom ntej.