Nyob rau hauv lub ntiaj teb no ntawm industrial machinery, kev ntseeg tau yog huab tais. Thaum ib qho khoom siv yuav tsum tau ua kom sov sai sai thiab tswj tau qhov kub thiab txias -los ntawm cov yas txhaj tshuaj molding tshuab thiab cov kab ntim khoom mus rau chav kuaj qhov cub thiab cov tshuab ziab khaub ncaws- cov engineers feem ntau tig mus rau lub tshuab cua sov. Raws li cov ntsiab lus tseem ceeb hauv cov tshuab cua kub suav tsis txheeb, lub tshuab cua sov lub tshuab ua haujlwm thiab kev ua haujlwm ntev nyob ntawm nws cov ntaub ntawv sheath, uas ua raws li thawj kab ntawm kev tiv thaiv ib puag ncig kev ntxhov siab, thermal qaug zog, thiab kev puas tsuaj rau txhua yam. Ntawm cov ntaub ntawv ntau yam muaj-xws li 316 stainless hlau, Incoloy alloys, thiab tooj liab-304 stainless hlau (SUS304) sawv tawm raws li cov khoom siv dav siv thoob plaws ntiaj teb. Tab sis vim li cas cov hlau tshwj xeeb no tau dhau los ua tus qauv kev lag luam rau ntau yam dav dav - cov phiaj xwm siv, txawm tias nyob hauv EU RoHS-raws li cov tshuab?
Cov lus teb yog nyob rau hauv qhov sib npaug zoo tshaj plaws ntawm chemistry thiab physics uas ua raws li qhov kev xav tau ntawm cov khoom siv hluav taws xob ntau tshaj plaws ntawm lub tshuab cua sov. 304 stainless hlau, paub txog kev tshawb fawb xws li austenitic chromium-nickel alloy (feem ntau muaj 18-20% chromium thiab 8-12% npib tsib xee), muaj qhov tshwj xeeb ntawm kev ua haujlwm corrosion. Tsis zoo li cov pa roj carbon steel, uas xeb tau yooj yim thaum raug ya raws lossis oxygen, cov ntsiab lus chromium hauv 304 stainless hlau tsim ib txheej nyias, pom tsis pom kev oxide txheej ntawm qhov chaw. Cov txheej txheem no tus kheej- kho thaum khawb lossis puas, tiv thaiv oxidation thiab corrosion{10}} ua kom nws zoo tagnrho rau cua sov, dej, thiab feem ntau tsis yog - cov kua corrosive (xws li cov roj ntxhia thiab cov kuab tshuaj tsis zoo) feem ntau ntsib hauv kev tsim khoom. Txawm li cas los xij, cov khawv koob tiag tiag tshwm sim thaum lub tshuab hluav taws xob lub tshuab hluav taws xob tsim khoom, qhov twg 304 cov khoom thermal tshwj xeeb ua pov thawj tsis muaj nuj nqis.
Raws li kev tshawb fawb dav dav ntawm SUS304 vuam thiab thermal ua, cov khoom siv thermal conductivity (kwv yees li 16.2 W / m·K ntawm 20 degree) yog qhov qis dua piv rau tooj liab lossis txawm tias 316 stainless hlau, thaum nws cov kab nthuav dav coefficient (17.2 × 10⁻⁶ / degree). Rau cov cua sov cartridge, uas yuav tsum tau nruj compaction ntawm magnesium oxide (MgO) rwb thaiv tsev nyob ib ncig ntawm lub internal kuj hlau, cov khoom no yog ib tug ob -edged ntaj- ib tug uas txawj manufacturers muaj peev xwm leverage rau kev ua tau zoo. Cov thermal conductivity tsawg pab khaws cov cua sov hauv qhov cua sov, txhim kho kev ua haujlwm, thaum lub siab nthuav dav coefficient txhais tau hais tias lub sheath expands uniformly nrog cov khoom sab hauv thaum cua sov thiab kev cog lus zoo thaum lub caij txias. Txawm li cas los xij, qhov no kuj txhais tau hais tias thaum lub sij hawm vuam txheej txheem (tseem ceeb rau kev sib khi lub rhaub qhov kawg thiab txuas cov terminals), kev tswj qhov kub thiab txias yuav tsum tau tswj cov kev ntxhov siab thiab tiv thaiv kev tawg. Cov tuam txhab muaj npe nrov siv cov txheej txheem vuam tshwj xeeb rau 304 stainless hlau, ua kom cov ntaub qhwv zoo li qub thiab xau{13}} pov thawj, txawm tias nyob rau hauv kev rov ua dua thermal.
Qhov tseeb, qhov nrov ntawm 304 stainless hlau tsis yog hais txog nws cov tshuaj tiv thaiv lossis thermal zog; nws kuj yog hais txog qhov tsis muaj qhov sib piv thiab tus nqi -kev ua tau zoo- ob yam uas tsav nws cov xwm txheej raws li qhov kev xaiv ua ntej. Rau cov txheej txheem cartridge rhaub cov ntaub ntawv uas qhov kev khiav hauj lwm kub tsis tshaj 700℃(thiab qhov zoo tshaj plaws nyob rau hauv qab 400℃rau ntev -lub sij hawm cia siab rau) thiab ib puag ncig yog tsis heev acidic, chloride - nplua nuj, los yog corrosive, 304 muab qhov zoo tshaj plaws tus nqi proposition. Nws yog cov neeg kho tshuab muaj zog txaus los tiv thaiv lub zog sib zog siab (feem ntau mus txog 10,000 psi) thaum lub sij hawm ntim ntawm MgO hmoov- tseem ceeb rau kev tshem tawm cov pa tawm uas ua rau kub kub thiab kub hnyiab ntxov. Tsis tas li ntawd, nws cov ductility thiab toughness tso cai rau nws los tiv thaiv cov thermal cycling ntawm niaj hnub kev lag luam, txo qhov kev pheej hmoo ntawm sheath deformation los yog puas thaum lub sij hawm.
Txawm li cas los xij, muaj qhov caveat: thaum 304 stainless hlau yog ntau yam zoo kawg, nws tsis yog invincible. Nws cov txheej txheem oxide passive tuaj yeem tawg hauv qhov chaw hnyav, ua rau degradation thiab tsis ua haujlwm. Yog tias lub tshuab cua sov siv rau hauv cov ntawv thov uas muaj cov dej ntsev, cov tshuaj chlorides siab (xws li hauv kev ua zaub mov nrog brines lossis tshuaj nroj tsuag nrog tshuaj chloride-raws li kev daws teeb meem), lossis kev ua haujlwm tsis tu ncua saum 800 degree, 304 qhov kev tiv thaiv corrosion thiab kub kam rau siab yuav raug cuam tshuam. Hauv cov xwm txheej zoo li no, pitting thiab crevice corrosion tuaj yeem tshwm sim-me me, kev puas tsuaj hauv cheeb tsam uas maj mam ua rau lub plhaub tsis muaj zog, thaum kawg nthuav tawm cov rwb thaiv tsev sab hauv thiab cov hlau tsis kam. Qhov no tsis yog tsuas yog ua rau lub tshuab hluav taws xob ntxov ntxov tab sis tseem ua rau muaj kev nyab xeeb xws li hluav taws xob poob lossis khoom puas tsuaj.
Rau EU RoHS-raws li daim ntawv thov, 304 stainless hlau kuj yog ib qho kev xaiv zoo tshaj plaws, vim nws ib txwm ua tau raws li RoHS kev txwv rau cov khoom phom sij (nws tsis muaj txhuas, mercury, cadmium, lossis lwm yam khoom txwv). Qhov no tshem tawm qhov kev xav tau ntawm kev hloov kho cov khoom siv kim lossis kev sim kom ua tau raws li qhov xav tau, ua rau nws muaj kev xaiv yooj yim rau cov tuam txhab lag luam tsom mus rau EU kev ua lag luam. Tsis zoo li qee qhov tshwj xeeb alloys uas yuav xav tau kev ua haujlwm ntxiv kom ua tau raws li RoHS cov qauv, 304 yog qhov ua tau raws li qhov tseeb, txo cov sij hawm ua cov hmoov txhuas thiab cov khoom nyuaj.
Thaum kawg, xaiv 304 stainless hlau cartridge rhaub yog hais txog kev sib piv cov khoom muaj peev xwm rau qhov chaw ua haujlwm. Rau feem ntau ntawm cov tshuab OEM, kev tsim khoom siv dav dav, thiab kev lag luam kev lag luam- qhov twg qhov kub thiab txias yog nruab nrab, ib puag ncig tsis yog- xeb, thiab tus nqi- kev ua tau zoo yog qhov tseem ceeb tshaj -304 tseem yog qhov kev nyab xeeb tshaj plaws, txhim khu kev qha, thiab pheej yig tshaj thawj koom ruam. Nws muaj qhov sib npaug zoo tshaj plaws ntawm kev tiv thaiv corrosion, txhua yam muaj zog, thermal kev ua tau zoo, thiab kev ua raws cai, ua rau nws qhov kev xaiv zoo tshaj plaws rau cov engineers thiab cov neeg yuav khoom thoob ntiaj teb. Thaum daim ntawv thov xav tau ntau dua (xws li kub siab dua lossis hnyav dua corrosion), cov ntaub ntawv tshwj xeeb xws li 316 stainless hlau lossis Incoloy tej zaum yuav tsim nyog-tab sis rau feem ntau, 304 stainless hlau xa cov kev ua tau zoo thiab tus nqi uas cov tshuab cua sov xav tau.
