1: Dab tsi yog cov txheej txheem tsim khoom tseem ceeb rau Hastelloy B Welded Pipe, thiab nws cov microstructure txawv ntawm cov yeeb nkab seamless li cas?
Hastelloy B welded yeeb nkab yog tsim los ntawm kev ua tiav ntawm kev sib sau thiab vuam. Cov txheej txheem feem ntau pib nrog lub phaj tiaj tus lossis kauj ntawm Hastelloy B-2 (qhov niaj hnub, qis- carbon variant). Cov phaj no yog thawj zaug precisely dov rau hauv ib lub cylindrical zoo siv ib tug series ntawm txoj kev yob. Qhov qhib seam yog tom qab ntawd koom nrog siv cov txheej txheem vuam, feem ntau yog Tungsten Inert Gas (TIG) vuam, tseem hu ua Gas Tungsten Arc Vuam (GTAW). Rau cov ntawv thov tseem ceeb, qhov no yog ua raws li tag nrho - annealing tshav kub kho nyob rau hauv ib qho chaw tswj, tsis muaj oxygen (kev daws teeb meem annealing) thiab tom qab ntawd pickling thiab passivation los kho kom zoo corrosion kuj.
Qhov tseem ceeb sib txawv ntawm cov yeeb nkab seamless (ua los ntawm extruding los yog tho ib lub pob zeb) nyob rau hauv nws cov microstructure thiab cov cuab yeej homogeneity.
Welded Yeeb Nkab: Nws muaj qhov sib txawv, thaj chaw microstructure nyob rau hauv qhov chaw vuam thiab tshav kub -Tebchaws cuam tshuam (HAZ). Txawm tias tom qab kev daws teeb meem annealing, thaj chaw no yuav muaj cov qauv sib txawv me ntsis piv rau cov niam txiv hlau. Lub vuam nws tus kheej feem ntau yog corrosion- tiv taus zoo li lub hauv paus hlau thaum ua kom raug nrog cov muab tub lim (ERNiMo-7), tab sis nws tseem yog thaj chaw metallurgically tsis tu ncua. Niaj hnub nimno vuam thiab kev kho cua sov tom qab lub hom phiaj kom txo qhov kev tsis sib xws.
Seamless Yeeb Nkab: Nws muaj qhov sib xws, homogeneous microstructure thoob plaws hauv nws qhov ncig uas tsis muaj vuam seam. Qhov no feem ntau pom tau tias muab cov khoom zoo sib xws thiab kev tiv thaiv corrosion nyob rau hauv txhua qhov kev qhia.
Rau ntau daim ntawv thov kev pabcuam corrosive hauv kev txo cov kua qaub, tsim kom zoo thiab cua sov- kho welded Hastelloy B yeeb nkab ua tau zoo heev. Kev xaiv ntawm welded thiab seamless feem ntau los rau tus nqi, qhov loj me (welded tuaj yeem tsim nyob rau hauv loj diameters los ntawm phaj), phab ntsa thickness yuav tsum, thiab qhov tshwj xeeb rhiab heev ntawm cov txheej txheem rau tej yam heterogeneity.
2: Dab tsi yog qhov txiaj ntsig tseem ceeb ntawm kev qhia Hastelloy B Welded Yeeb Nkab rau kev ua tshuaj lom neeg?
Kev Qhia Txog Hastelloy B Welded Pipe coj ntau qhov txiaj ntsig zoo rau cov txheej txheem ua tshuaj lom neeg ua haujlwm txo qis ib puag ncig:
Tsis sib haum Corrosion Resistance nyob rau hauv Ntsiab Media: Nws qhov tseem ceeb kom zoo dua yog tiv taus kub, tsis yog -oxidizing acids. Nws yog cov khoom siv rau kev tuav cov hydrochloric acid ntawm txhua qhov ntau thiab qhov kub thiab txias mus txog qhov kub thiab txias, nrog rau sulfuric, phosphoric, thiab acetic acids nyob rau hauv uas tsis yog - oxidizing tej yam kev mob. Qhov no ua kom lub neej ua haujlwm ntev thiab tiv thaiv kev puas tsuaj loj hauv cov txheej txheem nruj.
Tus nqi-Kev ua tau zoo rau qhov loj dua: Rau cov kav dej uas xav tau cov kab loj loj lossis tsis yog- qhov loj me, cov yeeb nkab welded yog qhov pheej yig dua li seamless. Nws tuaj yeem tsim los ntawm phaj raws li qhov xav tau, muab kev hloov pauv ntau dua hauv kev tsim qauv thiab kev tswj cov khoom muag.
Muaj thiab Lub Sijhawm Lead: Cov qauv loj ntawm Hastelloy B welded yeeb nkab feem ntau tau yooj yim dua los ntawm cov neeg muag khoom piv rau loj - txoj kab uas hla seamless yeeb nkab, uas yuav xav tau zeb xaj nrog lub sij hawm ntev txhuas.
Tswj Phab Ntsa Thickness thiab Surface Finish: Cov txheej txheem pib nrog dov phaj, uas tuaj yeem muab cov phab ntsa tuab zoo ib yam. Cov txheej txheem sab hauv tuaj yeem tswj tau thiab polished mus rau qib siab (xws li Electropolished) yog tias xav tau rau siab -purity lossis fouling- cov kev pabcuam rhiab heev, xws li hauv kev tsim tshuaj intermediates.
Haum rau Fabricated Cheebtsam: Welded yeeb nkab yog qhov zoo tagnrho rau kev tsim cov khoom siv txuas ntxiv mus rau hauv kev cai fittings, tsho, lossis cov hlab ntsha, vim tias cov khoom siv weldability twb muaj nyob rau hauv nws cov txheej txheem tsim khoom.
Cov txiaj ntsig zoo no ua rau nws mus- rau kev xaiv los tsim cov txheej txheem tseem ceeb, cov kab hloov pauv, thiab cov tshuab hluav taws xob reactor hauv kev lag luam xws li HCl synthesis, acetic acid ntau lawm, thiab alkylation units.
3: Dab tsi yog qhov tseem ceeb tshaj plaws thaum lub sij hawm tsim thiab vuam ntawm Hastelloy B Piping Systems los xyuas kom meej cov kev pab cuam?
Qhov tseem ceeb tshaj plaws yog kev tswj xyuas cov cua sov thiab qhov sib cuam tshuam ntawm qhov kub thiab txias thaum lub sij hawm vuam, ua raws li kev tshaj tawm kom zoo -weld heat treatment (PWHT).
Hastelloy B yog qhov ua rau muaj kev cuam tshuam rau theem ob yog tias tuav hauv qhov kub thiab txias ntev dhau. Tus thawj Hastelloy B (nrog cov pa roj carbon ntau dua thiab silicon) yog qhov ua rau carbide nag lossis daus hauv HAZ, ua rau "weld decay" lossis txo cov corrosion kuj. Cov niaj hnub Hastelloy B-2 alloy tau tsim nrog ultra-low carbon thiab silicon tshwj xeeb los txo qhov no.
Txawm li cas los xij, welding tsis zoo tseem tuaj yeem ua rau muaj teeb meem:
Cov nag lossis daus ntawm Intermetallic Phases: Cov cua txias qeeb lossis cov cua kub ntau dhau tuaj yeem ua rau muaj cov nickel-molybdenum intermetallic (xws li P theem lossis mu theem). Cov theem no deplete molybdenum los ntawm matrix, tsim cov cheeb tsam hauv cheeb tsam nrog txo qis corrosion kuj, tshwj xeeb tshaj yog nyob rau hauv HAZ tseem ceeb.
Kev sib kis: Vuam yam tsis muaj kev tiv thaiv roj tsis zoo (ob sab pem hauv ntej thiab nraub qaum purging nrog argon) ua rau oxidation, porosity, thiab "sugaring" (nkig, oxidized nto), tag nrho cov no yog qhov chaw pib rau corrosion.
Yog li ntawd, fabrication kev vam meej hinges rau:
Siv cov khoom siv Hastelloy B-2 nkaus xwb thiab txuam ERNiMo-7 muab cov hlau.
Siv cov txheej txheem tsim nyog GTAW (TIG) nrog cov khoom siv hluav taws xob tsawg.
Ua kom nruj interpass kub tswj (feem ntau hauv qab 100℃/ 212℃F).
Siv 100% argon thaub qab tshem tawm rau lub hauv paus hla thiab zoo dua txhua qhov hla.
Ua kom tiav cov tshuaj annealing kev kho cua sov tom qab vuam (piv txwv li, 1065-1120℃tom qab quenching ceev) kom rov-solve tej theem precipitated thiab restore ib homogeneous, corrosion-resistant microstructure. Rau cov teb loj-erected systems uas tag nrho anneal yog tsis yooj yim sua, nruj tswj ntawm txhua qhov weld pass yog qhov tseem ceeb tshaj.
4: Hauv qhov kev pabcuam tshwj xeeb twg yuav Hastelloy B Welded Pipe tsis tsim nyog lossis yuav tsum tau ceev faj heev?
Txawm hais tias nws muaj zog, Hastelloy B Welded Pipe muaj cov kev txwv meej uas hais qhov twg nws yuav tsum tsis txhob siv lossis siv nrog ceev faj:
Oxidizing Environments: Qhov no yog thawj qhov kev txwv. Hastelloy B muaj cov ntsiab lus chromium tsawg heev. Nyob rau hauv lub xub ntiag ntawm oxidizing tus neeg sawv cev xws li nitric acid, ferric ions (Fe³⁺), cupric ions (Cu²⁺), yaj oxygen, chlorine, hypochlorites, los yog peroxides, cov alloy raug kev puas tsuaj sai. Txawm tias me me ntawm cov kab mob no hauv qhov feem ntau txo cov kua qaub (xws li cov kab mob ferric chloride hauv hydrochloric acid) tuaj yeem ua rau muaj kev puas tsuaj loj. Nyob rau hauv xws li sib xyaw lossis oxidizing tej yam kev mob, yuav tsum muaj chromium- muaj hlau zoo li Hastelloy C-276.
Siab -Tsuas Kub Oxidizing Atmospheres: Nws muaj kev tiv thaiv tsis zoo rau oxidation ntawm qhov kub siab tshaj li ntawm 600℃(1110℃F) hauv huab cua lossis lwm yam pa oxygen- nplua nuj nyob hauv huab cua.
Alkaline Solutions Muaj Oxidizing Salts: Thaum feem ntau tiv taus alkalis, muaj cov ntsev oxidizing hloov cov txheej txheem corrosion, ua rau nws tsis haum.
Stress Corrosion Cracking (SCC) nyob rau hauv Polythionic Acids: Txawm hais tias feem ntau resistant rau chloride kev nyuaj siab corrosion cracking (SCC), nws tuaj yeem raug rau polythionic acid SCC yog sensitized (xws li, los ntawm kev vuam tsis zoo los yog kev kho cua sov) thiab raug rau ib puag ncig uas muaj sulfur compounds thiab noo noo.
Erosion-Corrosion in High-Velocity Slurries: Thaum corrosion-resistant, welded seam (txawm tias ua tau zoo kawg nkaus) tej zaum kuj yog ib qho tseem ceeb rau kev yaig nyob rau hauv siab - nrawm, khoom- muaj slurries. Hauv cov kev pabcuam zoo li no, cov yeeb nkab seamless nrog cov qauv microstructure zoo dua.
5: Hastelloy B Welded Piping Systems yuav tsum tau tshuaj xyuas thiab tswj xyuas li cas kom ntseeg tau ntev -lub sij hawm ncaj ncees?
Kev tshuaj xyuas thiab kev saib xyuas kom zoo yog qhov tseem ceeb vim qhov kev pabcuam tseem ceeb thiab muaj kev phom sij rau cov kav dej no feem ntau siv.
Kev tshuaj xyuas:
Thaum lub sij hawm Fabrication/Installation: 100% kev kuaj pom ntawm cov hauv paus hniav thiab cov kaus mom yog qhov yuav tsum tau ua. Dye Penetrant Testing (PT) yog siv dav los kuaj xyuas qhov chaw - rhuav tshem qhov tsis xws luag hauv welds. Rau cov kab tseem ceeb, Kev Ntsuas Hluav Taws Xob (RT) lossis Kev Ntsuas Ultrasonic (UT) yog ua haujlwm los txheeb xyuas qhov kev ncaj ncees ntawm sab hauv thiab tsis muaj qhov tsis xws luag.
Hauv -Kev Tshawb Fawb Kev Pabcuam: Kev kuaj pom sab nraud tsis tu ncua rau cov paib ntawm cov pa xau, corrosion nyob rau hauv rwb thaiv tsev, lossis kev puas tsuaj. Ultrasonic Thickness (UT) gauging yog qhov tseem ceeb hauv -kev pabcuam tsis yog- kuaj kev puas tsuaj. Lub hauv paus thickness nyeem ntawv yuav tsum tau coj mus rau tom qab kev teeb tsa ntawm qhov chaw saib xyuas, tshwj xeeb tshaj yog nyob rau hauv welds, khoov, thiab thaj chaw ntawm kev cia siab tias muaj kev kub ntxhov los yog condensation. Periodic re- ntsuas ntsuas tus nqi corrosion. Kev txheeb xyuas cov khoom zoo (PMI) siv cov khoom siv tes tuav XRF tuaj yeem siv thaum kuaj xyuas kom paub tseeb tias muaj pes tsawg leeg, kom tsis txhob muaj cov khoom sib tov- nce.
Kev tu:
Kev Tu: Tsuas yog siv cov tshuaj ntxuav thiab dej uas muaj chloride-dawb thiab tsis yog - oxidizing. Cov chloride residual tuaj yeem ua rau pitting, tshwj xeeb tshaj yog nyob rau hauv rwb thaiv tsev.
Kho Vuam: Txhua qhov kev kho lossis hloov kho yuav tsum ua raws li cov txheej txheem vuam nruj ib yam li kev tsim kho qub, suav nrog tom qab- kho cov cua sov yog tias ua tau. "Cold" cov tswv yim kho xws li epoxy lossis clamping feem ntau yog ib ntus thiab tsis pom zoo rau cov txheej txheem tseem ceeb.
Cov Ntaub Ntawv Khaws Cia: Khaws cov ncauj lus kom ntxaws raws li - tsim cov duab kos, cov ntaub ntawv txheej txheem vuam (PQR/WPS), thiab cov ntaub ntawv tshuaj xyuas. Cov keeb kwm no yog qhov muaj txiaj ntsig zoo rau kev daws teeb meem thiab npaj kev cog qoob loo yav tom ntej.
Cov Khoom Muag Khoom Muag: Khaws cov khoom lag luam ua ntej-fabricated Hastelloy B spool pieces thiab lub luj tshib, tsim rau tib lub ntsiab lus raws li lub hauv paus system, tso cai rau sai, siab - kev ncaj ncees hloov thaum lub sij hawm tsis tau npaj tseg.
