1. Dab tsi yog qhov tseem ceeb ntawm kev pom zoo thiab cov tswv yim sib txuam ntawm al-6xn (UN tsis muaj N08367)?
Dab tsi ntawm stainless hlau yog al-6 xNn, thiab dab tsi ib qho cuab yeej yog nws nto npe tshaj plaws rau?
Al - 6xn (tsis paub (tsis yog n08367) yog "Super {{{}}} txoj kab hlau. Qhov kev faib tawm no tau qhia tias nws cov ntsiab lus aluminium thiab kev ua tau zoo tshaj cov qauv Austenitic qib (lossis nyob rau ntau cov neeg npib tsib xee rau cov kev pab cuam corrosive.
Cov cuab yeej muaj npe nws yog qhov muaj npe nrov rau nws yog nws qhov tshwj xeeb tiv thaiv kom pitting thiab crevice corrosion hauv chloride ib puag ncig. Qhov no yog qhov tshwm sim ncaj qha ntawm nws cov tshuaj lom neeg muaj kuab lom, uas yog cov tswv yim tsim los ua kom ntau tshaj tawm cov lej sib npaug (pren).
Pren mis: pren =% cr {{1} mo) + 16 • (% n)
Al-6xN muaj pes tsawg leeg & Pren:
High chromium (~ 20.5%): Ua ib lub zog ua kom ruaj khov, passive chromium oxide (cr₂o₃) txheej.
Heev Molybdenum (~ 6.3%): tus thawj tiv thaiv tawm tsam chlorides. Molybdenum synergistically ntxiv dag zog rau zaj duab xis passive, ua rau nws nyuaj rau chloride ions kom nkag mus thiab pib pitting.
High nitrogen (~ 0.22%): Ib qho muaj zog, nqi-}} txoj kev ruaj khov thiab ntxiv dag zog. Nitrogen tseem ceeb cuam tshuam nrog pitting ua thiab nce cov alloy tshaj tawm lub zog.
Nrog tus pren feem ntau tshaj 45, al-6xn zaum hauv kev ua haujlwm theem siab deb 316) thiab 904L (pren ~ 36), ua rau nws bentermark rau chloride rau cov hlwv hlau.
2. Dab tsi yog qhov sib tw metallurgical rov qab tom qab nws ua tau zoo thiab lub luag haujlwm ntawm "?
Tshaj li tus lej Pren siab, ua li cas ntawm cov Molybdenum thiab nitrogen ua haujlwm?
Kev sib xyaw ntawm "siab Molybdenum + siab nitrogen" yog lub pob zeb ntawm Al-6 XL's Metallurgy, muab cov nyiaj pab dhau ntawm tus Pren yooj yim dua.
Synergistic pates Kuj: Molybdenum thiab nitrogen ua haujlwm ua ke los tsim cov zaj duab xis passive siab ruaj khov. Molybdenum enriches nyob rau hauv lub passive zaj duab xis, thaum nitrogen dissolves nyob rau hauv lub qhov pib, ua repassivation (kev kho kom zoo nkauj) tshwm sim nrawm dua. Qhov no synergy tau txais txiaj ntsig zoo rau qhov ntsuas kub siab (CPT), tso cai al-6xn siv rau hauv cov hlaus hauv kub tshaj lwm tus qauv stainless.
Cov teeb meem daws teeb meem zog: Ob leeg Molybdenum thiab nitrogen yog potent solent daws cov khoom siv ntxiv. Qhov no muab ib qho - 6 x tau ntau dua cov hlau tsis muaj zog, uas ua rau muaj qhov sib zog ua kom zoo ib yam rau nws cov khoom siv siab dua.
Microstrationitation: Cov ntsiab lus nitrogen dav ua kom muaj kev sib cav sib ceg uas muaj peev xwm ua kom muaj kev sib cav sib ceg hauv lwm qhov siab - molybdenum alloys. Qhov kev ruaj khov no yog qhov tseem ceeb rau kev muab cov khoom siv hluav taws xob nyuaj.
3. Hauv kev lag luam tshwj xeeb thiab cov ntawv thov yog Al-6XN seamery cov yeeb nkab kev xaiv?
Qhov twg yog cov cuab yeej tshwj xeeb cov cuab yeej ntawm Al-6XN piping feem ntau siv tau?
Al - 6Xn Seamless kav yog cov khoom siv ntawm cov qauv sib cav tsis nrawm, thiab cov nqi ntawm cov nickel-based alloys tsis yog neeg ncaj ncees.
Offshore roj & roj thiab marine:
Cov ntawv thov: dej hiav txwv dej txias, cov raj hluav taws kub, kaus mom dej, thiab pipicebilical hlab, qab zib, qab ntsev, thiab qaub).
Vim li cas Al - 6xn? Nws cov tsis sib haum tsis kam rau pitting thiab crevice corrosion nyob rau hauv seawater, txawm tias nyob rau hauv ruam lossis dej ntws tsawg, ua rau nws zoo tagnrho. Nws txoj kev tawm tsam rau cov chloride kev ntxhov siab corrosion (SCC) kuj zoo dua li 300 series stainless hlau.
Tshuaj Kev Lag Luam:
Cov ntawv thov: Piping rau tuav chloride - hypochlorite daws, thiab sulfuric cov kev daws teeb meem, thiab cov sulphoric acids muaj chlorides.
Vim li cas Al - 6xn? Nws txuas txuas qhov sib txawv ntawm 316 / 904L thiab siab {5} {}}}} ast-ast-ange-276 rau ntau ntawm cov kev pab cuam thiab kev daws teeb meem.
Flue Gas Desulfurization (FGD) Lub Tshuab:
Daim ntaub ntawv: Qhov hluav taws xob ducting, dampers, thiab tshuaj tsuag headers.
Vim li cas Al-6xn? Nws tiv thaiv cov condensates uas tsim, uas yog acidic thiab muaj ntau qib ntawm chlorides los ntawm txhuam txhuam kua roj.
Kws Tshuaj Thiab Biotech:
Cov ntawv thov: High {{{{{{{{}} cov tshuab pipent thiab ua kom cov pearing tu kom huv si (piv txwv li, tshuaj dawb, saline daws).
Vim li cas Al - 6xn? Nws ua kom ultra - siab purity los ntawm kev tiv thaiv corrosion {}}}} ua paug thiab muab kev ntseeg tau ntev.
4. Dab tsi yog qhov tseem ceeb tsim thiab vuam kev txiav txim rau al-6xn seamless kav?
Dab tsi yog qhov tseem ceeb hauv kev ua kom zoo nkauj thiab vuam al-6xn piping?
Lub siab alloy cov ntsiab lus uas muab nws cov kev pabcuam zoo tshaj plaws uas tsim nyog cov kev coj ua tshwj xeeb los khaws cia nws corrosion tsis kam, tshwj xeeb tshaj yog nyob rau hauv thaj chaw weld.
Raug (Seamless Yeeb Nkab):
Seamless kav yog tsim los ntawm extruding lossis tho ib lub nplua nuj rau al- 6xn raws li nws zam kev hloov cov yeeb nkab txuam nrog cov yeeb nkab welded. Cov kav dej yog li cov lus qhia ntxiv (rhuab mus rau qhov kub thiab txias thiab ua tiav cov homogeneous, corrosion-resistant microstructure.
Vuam:
Lub hom phiaj yog tsim cov weldment uas corrosion kam ntais ntawv cov hlau.
Tus tub lim hlau: Tus qauv thiab pom zoo muab cov hlau siv hlau yog ernicrmo {}} 10 (alloy 625). Thaum no yog ib lub nickel - based alloy, nws yog siv los vim tias ntau dua corrosion {{}} tiv taus ib feem ntawm kev sib koom tes. Kev siv cov khoom siv sib xyaw ua ke yog ua tau tab sis yuav tsum tau precision heev kom tsis txhob muaj micro-soobreg.
Cov kev ceev faj:
Tswj cov pa hluav taws xob tsawg: Siv cov hlua khi ntawm cov hlua khi thiab ua kom muaj kev nyuaj siab los tiv thaiv nag lossis ntau dua), uas tuaj yeem tsim cov cheeb tsam raug mob rau corrosion.
Kev Ntsuas Kub Kev Tswj Kub: nruj tswj qhov kev cuam tshuam kub, feem ntau qis dua 100℃(212 Qib F).
Rov qab ntxuav kom huv: Yuav tsum siv 100% sib cav rov qab kom tsis txhob ua rau oxidation (qab zib) ntawm lub hauv paus pib sab hauv, uas yuav tsim txoj kev pib ua haujlwm loj heev sab hauv.
Tshaj tawm - Weld tu thiab ua kom tiav: tshem tawm tag nrho cov cua sov kom siv tshuab (txhuam hniav) thiab / lossis tshuaj txhuam hniav (pickling nrog hno3 / hf) cov hau kev. Hla nrog nitric acid yog qhov tseem ceeb kom rov qab ua cov ris tsho sab nrauv oxide txheej.
5. Dab tsi yog qhov chaw ua haujlwm thiab cov kev txwv ntawm al-6xn?
Dab tsi yog qhov tseem ceeb txwv thiab tsis ua tiav cov qauv ntawm al-6xn uas cov kws tshawb fawb yuav tsum xav txog?
Txawm hais tias nws "super" xwm txheej, al-6xn muaj cov ciaj ciam meej hauv cov corrosive thiab cov ntsiab lus cov ntsiab lus.
Corrosion txwv:
Hydrochloric thiab sulfuric acids: zoo li 904L, Al-}}}}} oxidizing txo cov acids zoo li hydrochloric acid thiab kub, muaj cov sulfuric acid. Rau cov no, muaj tseeb nickel alloys yuav tsum muaj.
Kev ntxhov siab corrosion cracking (SCC): Thaum nws cov ntsiab lus siab thiab npib tsib (~ 24%) Muab nws ua tsis taus cov tshuaj pleev xim, nws tsis raug tiv thaiv cov tshuaj tiv thaiv. Ua tsis tiav yuav tshwm sim nyob rau hauv huab cua sov heev, chloride kev xav, acidity (tsis muaj kev ntxhov siab (tshwj xeeb tshaj yog los ntawm cov chaw ntxhov siab vuam).
Crevice corrosion: nws muaj qhov kub siab heev cejnice (CCT), tab sis nyob rau hauv txaus txhoj puab, kub, thiab nruj clevices, corrosion tseem pib.
Neeg kho tshuab thiab tus nqi txwv:
Lub zog vs. Duplex: Thaum muaj zog dua li cov qauv Austenitics, nws tau cog lus lub zog (~ 44750 (~ 80 ksi min). Rau siab siab - qhov kev siv lub siab, lub siab yuav muaj qhov hnyav dua {{}} qhov kev daws teeb meem corrosion yog qhov haum.
Tus nqi: Nws yog tus hwm nkaus xwb. Its use is an economic decision, justified by its longevity and reliability in environments that would destroy lower-grade materials. Rau kev nthuav dav tsawg heev, 317l lossis 904L tej zaum yuav muaj txaus ntawm tus nqi qis.
Xaus: Al {- 6xn yog thawj lub adnier super {} - induced corrosion. Nws cov molybdenum siab thiab cov ntsiab lus nitrogen muab ib theem ntawm pitting thiab crevice corrosion tsis kam uas txhais tau qhov txwv sab saud rau cov hlau sab sauv. Nws cov ntawv thov kev vam meej ntawm cov yeeb nkab uas tsim nyog ntawm cov yeeb nkab uas tsis zoo uas nws muaj peev xwm nkag siab, muaj ciam av uas txo qis acid ib puag ncig.
