1. Q: Lub hauv paus muaj pes tsawg leeg thiab metallurgical qauv ntawm Nickel 200 yog dab tsi, thiab ua li cas cov yam ntxwv no dictate nws tshwj xeeb corrosion kuj thiab mechanical khoom profile piv rau cov qauv austenitic stainless hlau?
A:Nickel 200 (UNS N02200) yog cov khoom lag luam ntshiab wrought npib tsib xee alloy, nominally muaj qhov tsawg kawg nkaus ntawm 99.0% npib tsib xee, nrog cov lej ntawm cov hlau (tsawg dua lossis sib npaug li 0.40%), manganese (tsawg dua lossis sib npaug li 0.35%), carbon (Less dua lossis sib npaug li 0.1%). 0.35%), thiab tooj liab (tsawg dua lossis sib npaug li 0.25%). Cov qauv metallurgical yog lub ntsej muag -centered cubic (FCC) austenitic thoob plaws txhua qhov kub, uas muab ductility zoo, formability, thiab toughness los ntawm cryogenic kub txog li 315℃(600℃F). Tsis zoo li cov hlau tsis muaj hlau uas vam khom rau cov chromium oxide passive txheej rau corrosion kuj, Nickel 200 muab nws cov kev tiv thaiv corrosion los ntawm lub hauv paus tseem ceeb ntawm cov hlau nickel nws tus kheej. Qhov kev sib txawv no yog qhov tseem ceeb: Nickel 200 nthuav tawm tshwj xeeb tiv thaiv rau caustic alkalis (sodium thiab potassium hydroxide) ntawm txhua qhov chaw thiab qhov kub thiab txias, suav nrog cov molten caustic ib puag ncig uas stainless hlau yuav raug kev puas tsuaj los ntawm kev puas tsuaj rau corrosion. Nws kuj ua tau zoo tshwj xeeb hauv kev txo qis ib puag ncig, xws li tsis yog - oxidizing acids (xws li, dilute sulfuric thiab hydrochloric acids) nyob rau hauv cov pa oxygen -dawb, thiab hauv qhuav halogens xws li chlorine thiab fluorine ntawm qhov kub siab. Txawm li cas los xij, nws lub zog txhua yam yog qis dua li ntawm austenitic stainless hlau; yield zog ntawm annealed Nickel 200 feem ntau yog 15-30 ksi (103-207 MPa), piv rau 30-45 ksi (207-310 MPa) rau 304/316 stainless hlau. Lub zog qis no yuav tsum muaj cov phab ntsa tuab dua rau qhov sib npaug siab- muaj peev xwm, qhov tseem ceeb hauv kev tsim cov kav dej thiab kev txheeb xyuas tus nqi ntawm lub neej.
2. Q: Hauv kev siv tshuaj lom neeg uas muaj cov concentrated caustic soda (NaOH) ntawm qhov kub siab, dab tsi ua rau Nickel 200 cov khoom nyiam tshaj austenitic stainless hlau, thiab dab tsi tshwj xeeb tsis ua hauj lwm mechanisms nws txo?
A:Nickel 200 yog universally lees paub tias yog cov khoom siv tseem ceeb rau kev tuav cov kua dej qab ntsev (sodium hydroxide) ntawm qhov kub siab vim nws qhov tshwj xeeb tsis kam rau kev ntxhov siab corrosion cracking (CSCC) thiab kev xeb.
Austenitic stainless hlau, suav nrog qib 304 thiab 316, muaj kev cuam tshuam ntau rau kev ntxhov siab corrosion tawg thaum raug sodium hydroxide ntau dua 50% ntawm qhov kub siab tshaj 60℃(140℃F). Qhov no insidious tsis ua hauj lwm mechanism manifests li intergranular los yog transgranular cracking nyob rau hauv lub sib xyaw ua ke ntawm tensile kev nyuaj siab thiab corrosive caustic ib puag ncig, feem ntau ua rau muaj kev puas tsuaj, unplanned tsis ua hauj lwm yam tsis muaj qhov tseem ceeb ua ntej phab ntsa thinning. Nickel 200, los ntawm kev sib piv, pom zoo tsis muaj kev cuam tshuam rau CSCC thoob plaws tag nrho cov concentration thiab kub ntau ntawm sodium hydroxide kev pab. Cov zaj duab xis tsis zoo tsim los ntawm nickel nyob rau hauv ib puag ncig caustic yog qhov ruaj khov thiab nws tus kheej- kho, ua rau muaj qhov tsis zoo ntawm qhov corrosion tsis zoo- feem ntau tsawg dua 0.025 mm / xyoo (1 mpy) txawm nyob hauv 50% NaOH ntawm 150℃(302℃F).
Tsis tas li ntawd, Nickel 200 yog resistant rau caustic embrittlement, ib qho tshwm sim uas tuaj yeem cuam tshuam cov pa roj carbon steel hauv qhov chaw zoo sib xws. Cov khoom siv cov ntsiab lus siab nickel tiv thaiv kev tsim cov microstructures susceptible uas ua rau hydrogen-induced cracking. Rau cov laj thawj no, Nickel 200 seamless yeeb nkab yog tus qauv specification rau caustic evaporator raj, caustic hloov kab, thiab mercury cell cog piping hauv chlor-alkali kev lag luam. Thaum qhov kev siv nyiaj thawj zaug rau Nickel 200 yog qhov ntau dua li cov hlau tsis muaj steel, tus nqi ntawm lub neej yog kev ncaj ncees los ntawm kev tshem tawm cov kev tiv thaiv corrosion, kev zam ntawm kev ntxhov siab corrosion cracking tsis ua hauj lwm, thiab kev ua tiav ntawm kev pab cuam lub neej tshaj 25 xyoo hauv kev pabcuam tseem ceeb caustic.
3. Q: Dab tsi yog qhov tseem ceeb ntawm kev tsim thiab vuam kev txiav txim siab rau Nickel 200 seamless yeeb nkab, tshwj xeeb tshaj yog hais txog kev sib koom ua ke, kev xaiv hlau muab tub lim, thiab tom qab-weld heat treatment?
A:Vuam Nickel 200 yuav tsum tau ua tib zoo saib xyuas kev huv thiab kev tswj xyuas cov txheej txheem, vim tias cov khoom siv tau zoo heev rau embrittlement los ntawm cov kab mob xws li sulfur, lead, thiab phosphorus uas yog benign hauv carbon steel thiab stainless hlau fabrication.
Kev sib koom ua ke thiab kev huv:Ua ntej vuam, txhua qhov chaw nyob hauv 50 hli (2 ntiv tes) ntawm qhov sib koom ua ke yuav tsum tau degreased kom huv si siv acetone los yog ib qho zoo sib xws uas tsis yog -chlorinated hnyav. Abrasive cov cuab yeej siv rau carbon steel yuav tsum mob siab rau kev ua haujlwm nickel los tiv thaiv kev sib kis -; Txawm tias cov hlau me me tuaj yeem ua rau lub ntsej muag corrosion lossis vuam tsis xws luag. Kev siv cov tshuaj chlorinated cov kuab tshuaj yog nruj me ntsis txwv tsis pub, vim cov chlorides seem tuaj yeem ua rau muaj kev ntxhov siab corrosion cracking post- pabcuam.
Filler hlau xaiv:Tus txheej txheem muab tub lim hlau rau vuam Nickel 200 yogNickel 61 (UNS N9961) CAS TSIS TAU., ib qho kev sib xyaw ua ke muab tub lim uas tswj cov kev tiv thaiv corrosion thiab cov khoom siv ntawm lub hauv paus hlau. Rau qhov sib txawv welds-xws li Nickel 200 rau stainless hlau lossis carbon steel-ENiCrFe-2los yogENiCrFe-3(Inconel 182-type) fillers feem ntau yog ua haujlwm. Cov high -nickel chromium-hlau fillers haum rau qhov sib txawv thermal expansion ntawm npib tsib xee thiab hlau thaum muab lub zog txaus thiab corrosion kuj.
Vuam txheej txheem:Gas tungsten arc vuam (GTAW/TIG) yog qhov zoo dua rau cov hauv paus hla kom paub meej meej thiab tsis muaj paug. Thaum tshav kub kub input yuav tsum tau ua tib zoo tswj; thaum preheating feem ntau tsis tas yuav tsum tau, interpass kub yuav tsum tau khaws cia hauv qab 150℃(300℃F) kom tsis txhob kub tawg. Lub pas dej weld yuav tsum muaj kev tiv thaiv siab -purity argon lossis helium, thiab sab nraub qaum ntawm lub hauv paus hla yuav tsum tau purged nrog inert roj los tiv thaiv oxidation. Nickel 200 nthuav tawm ib qho sluggish, pasty weld pool tus yam ntxwv uas yuav tsum tau kev cob qhia welder tshwj xeeb rau cov nickel alloys.
Tom qab-weld heat treatment (PWHT):Hauv cov ntawv thov feem ntau, PWHT tsis tas yuav tsum tau thiab tsis pom zoo rau Nickel 200. Cov khoom siv feem ntau yog siv rau hauv cov mob annealed, thiab kev kho cua sov tsis txhim kho nws cov corrosion kuj. Txawm li cas los xij, yog tias cov kav dej tau raug ua haujlwm txias txias thaum lub sijhawm tsim khoom, qhov kev ntxhov siab txo qis ntawm 595-705℃(1100-1300℃F) tuaj yeem ua kom rov qab ductility. Txoj kev kho no tsuas yog siv tau yog tias cov khoom tsis muaj leej faj kab mob; txwv tsis pub, hnyav embrittlement tuaj yeem tshwm sim.
4. Q: Nyob rau hauv siab -purity daim ntaub ntawv xws li tshuaj, semiconductor, thiab tshwj xeeb tshuaj raug tsim, dab tsi tshwj xeeb procurement thiab deg tiav yuav tsum tau siv rau Nickel 200 seamless yeeb nkab tshaj tus qauv ASTM specifications?
A:Rau siab -purity thiab ultra-siab-purity (UHP) daim ntawv thov, Nickel 200 seamless yeeb nkab yuav tsum ua tau raws li cov kev cai nruj uas txuas mus deb dhau lub hauv paus ASTM B161 specification (Standard Specification for Nickel Seamless Pipe and Tube). Cov kev xav tau ntxiv no hais txog kev huv ntawm qhov chaw, passivation, thiab traceability los tiv thaiv kev sib kis ntawm cov txheej txheem rhiab heev.
Nto tiav:Cov txheej txheem zeb tiav tsis tsim nyog rau siab -purity daim ntawv thov. Cov kav dej feem ntau teev nrog amechanically polishedlos yogelectropolishedInternal diameter (ID) nto. Cov tshuab polishing ua tiav qhov kev ntxhib los mos (Ra) tsawg dua lossis sib npaug li 0.5 µm (20 µin) kom txo cov khoom nkag thiab cov kab mob adhesion. Electropolishing txuas ntxiv txhim kho qhov chaw los ntawm kev xaiv tshem tawm micro-peaks, tsim kom muaj qhov du, tsis muaj qhov chaw nrog Ra tsawg li 0.25 µm (10 µin). Cov txheej txheem no tseem txhawb cov txheej txheem nickel oxide, muab kev tiv thaiv corrosion zoo dua thiab kev huv.
Kev huv huv thiab ntim khoom:Qhov tseem ceeb tshaj plaws ntawm kev yuav khoom yoghydrocarbon- ntawv pov thawj pub dawb. Nickel ua raws li cov catalyst rau qee yam kev cuam tshuam cov organic; Txawm tias cov roj seem ntawm cov roj, roj, los yog cov roj lubricants tuaj yeem ua rau cov kev xav tsis zoo los yog ua rau cov khoom sib kis. Cov kav dej yog feem ntau procured nrogASTM G 93(Txoj Kev Xyaum Kev Ua Haujlwm Zoo) ua raws li, qhia cov kuab tshuaj degreasing, ntxuav ultrasonic, thiab zaum kawg yaug nrog dej deionized. Txhua lub yeeb nkab ntev yog muab ntim rau hauv ib lub hnab huv huv -chaw ib puag ncig thiab kaw kom tsis txhob muaj kab mob thaum thauj.
Cov ntaub ntawv thiab traceability:Tag nrho traceability yog yuam, feem ntau yuav tsum tauEN 10204 Hom 3.1ntawv pov thawj rau tus qauv siab -purity kev pab thiabHom 3.2(kev ywj pheej thib peb-kev soj ntsuam tog) rau kev siv tshuaj thiab semiconductor. Cov ntawv pov thawj yuav tsum muaj xws li yaj chemistry, cov khoom siv kho tshuab, cov txiaj ntsig kuaj hydrostatic, thiab kev txheeb xyuas kom huv si. Ntxiv thiab,Kev txheeb xyuas cov khoom zoo (PMI)ntawm txhua cov yeeb nkab ntev yog feem ntau yuav tsum tau kom paub meej tias cov ntsiab lus nickel (Ntau dua lossis sib npaug li 99.0%) thiab txhawm rau txheeb xyuas qhov sib xyaw ua ke -ups nrog qis dua - qib nickel alloys lossis stainless hlau.
Bridgman grain loj:Rau cov khoom siv hluav taws xob thiab cov khoom siv siab - nqus tsev vacuum,Bridgman grain loj tswjqee zaum tau teev tseg. Loj, directionally solidified nplej yog nyiam los txo qis ciam teb ceev, txo qhov chaw muaj peev xwm rau outgassing thiab corrosion pib. Cov txheej txheem tsim khoom tshwj xeeb no ua rau cov nqi khoom nce ntxiv tab sis yog qhov tseem ceeb rau qhov xav tau tshaj plaws ultra- siab- nqus tsev vacuum (UHV) thiab siab - purity gas distribution systems.
5. Q: Xav txog tag nrho cov nqi ntawm lub neej (LCC) rau cov kav dej hauv cov chlor-alkali lossis fluoropolymer ua cov nroj tsuag, Nickel 200 piv rau lwm cov ntaub ntawv xws li 316L stainless hlau, thiab dab tsi kev lag luam ua pov thawj nws qhov kev siv nyiaj ntau dua (CAPEX)?
A:Qhov kev pom zoo ntawm kev lag luam rau kev qhia txog Nickel 200 seamless yeeb nkab hinges ntawm kev txheeb xyuas tus nqi ntawm lub neej zoo uas suav nrog cov nqi khoom siv, kev tiv thaiv corrosion, kev saib xyuas, kev poob qis, thiab kev cia siab rau lub neej. Thaum pib CAPEX rau Nickel 200 yog qhov siab dua -feem ntau 3 mus rau 5 npaug ntawm 316L stainless hlau- tus nqi tag nrho ntawm cov tswv cuab feem ntau nyiam npib tsib xee hauv cov tshuaj lom neeg nruj heev.
Corrosion nyiaj pub dawb:Hauv kev pab cuam caustic soda ntawm qhov kub siab (piv txwv li, 50% NaOH ntawm 90 degree), 316L stainless hlau nthuav tawm dav dav corrosion tus nqi ntawm 0.1-0.5 hli / xyoo thiab muaj kev cuam tshuam rau caustic stress corrosion cracking (CSCC). Yuav kom txo tau qhov no, engineers yuav tsum qhia kom meej cov phab ntsa tuab (ntxiv rau kev tiv thaiv corrosion) thiab lees txais qhov kev pheej hmoo ntawm kev ua tsis tiav ntxov. Nickel 200, los ntawm qhov sib piv, nthuav tawm cov nqi corrosion ntawm qis dua 0.025 hli / xyoo uas tsis muaj kev cuam tshuam rau CSCC, tso cai rau kev tiv thaiv corrosion tsawg thiab tshem tawm qhov kev pheej hmoo ntawm kev ntxhov siab{11}} cuam tshuam txog kev ua tsis tiav.
Kho thiab downtime:Cov kav dej uas tsim los ntawm 316L hauv kev pabcuam hnyav hnyav feem ntau xav tau kev tshuaj xyuas ntau zaus (feem ntau txhua xyoo), kho, thiab hloov qhov tshwm sim hauv 5-10 xyoo. Txhua qhov kev kaw tsis tau teem sijhawm rau kev kho vuam lossis hloov cov yeeb nkab yuav raug nqi tseem ceeb: kev tsim khoom ploj (feem ntau $ 50,000- $ 500,000 ib hnub hauv kev ua tshuaj), kev ua haujlwm, thiab kev nyab xeeb. Nickel 200 systems niaj hnub ua tiav kev pabcuam lub neej ntawm 25 xyoo lossis ntau dua nrog kev saib xyuas tsawg, xa cov kev siv nyiaj ntau heev (OPEX) kev txuag nyiaj dhau lub cuab tam lub neej.
Fabrication thiab installation:Thaum Nickel 200 vuam xav tau cov txheej txheem tshwj xeeb thiab cov neeg ua haujlwm txawj, nce cov nqi tsim khoom los ntawm kwv yees li 20-40% piv rau cov hlau tsis muaj steel, cov nqi no raug txiav tawm rau lub neej ntev. Tsis tas li ntawd, lub zog qis dua ntawm Nickel 200 yuav tsum muaj cov phab ntsa hnyav dua rau qhov sib npaug ntawm cov kev ntsuas siab, nce cov khoom hnyav thiab muaj peev xwm xav tau kev txhawb zog ntau dua. Txawm li cas los xij, nyob rau hauv feem ntau cov ntawv thov caustic, cov phab ntsa uas yuav tsum tau ua yog tseem tswj hwm los ntawm kev tiv thaiv corrosion ntau dua li qhov siab, txo qhov tsis zoo no.
Risk mitigation:Hauv cov ntawv thov tseem ceeb xws li chlor-alkali nroj tsuag, qhov tshwm sim ntawm cov kav dej tsis ua haujlwm txuas ntxiv tshaj li cov nqi hloov ncaj qha. Kev tso tawm Caustic ua rau muaj kev phom sij loj heev rau cov neeg ua haujlwm, tuaj yeem ua rau muaj kev nplua rau ib puag ncig, thiab tuaj yeem ua rau muaj kev soj ntsuam xyuas. Nickel 200 qhov pov thawj kev ntseeg siab nyob rau hauv ib puag ncig zoo li no muab kev pheej hmoo txo cov txiaj ntsig uas, thaum nyuaj rau kev suav, feem ntau yog qhov kev txiav txim siab rau cov tswv thiab cov neeg ua haujlwm.
Kev txiav txim siab txog tus nqi lifecycle:Thaum tus nqi tag nrho ntawm kev ua tswv cuab raug xam ntau dua 20-xyoo qab ntug- suav nrog kev yuav khoom thawj zaug, kev tsim khoom, kev teeb tsa, kev tshuaj xyuas, kev saib xyuas, kev hloov pauv, thiab kev pheej hmoo ntawm kev tsim khoom poob-Nickel 200 feem ntau ua pov thawj kev lag luam zoo dua rau 316L hauv cov kev pabcuam siab {{7}.tem Cov khoom siv tus nqi siab dua yog offset los ntawm kev siv lub neej ntev, txo kev saib xyuas, thiab tshem tawm cov kev cuam tshuam txog corrosion, ua rau nws xaiv qhov kev xaiv rau cov kev pabcuam tseem ceeb uas muaj kev ntseeg siab thiab kev ua haujlwm ntev yog qhov tseem ceeb.
