1. Q: Dab tsi yog qhov txawv ntawm Nickel 201 Seamless Pipe (UNS N02201) los ntawm nws cov khoom siv ntau dua, Nickel 200, hais txog cov khoom siv thiab kev thov kom haum?
A: Thaum ob qho tib si Nickel 200 (UNS N02200) thiab Nickel 201 (UNS N02201) yog cov khoom lag luam ntshiab wrought nickel alloys, qhov sib txawv tseem ceeb nyob hauv lawv cov ntsiab lus carbon thiab qhov cuam tshuam rau kev coj tus cwj pwm hauv qhov kub thiab txias. Nickel 200 muaj cov ntsiab lus siab tshaj plaws ntawm 0.15%, whereas Nickel 201 yog qhov qis -carbon variant nrog cov ntsiab lus siab tshaj plaws ntawm 0.02%. Qhov no seemingly me me compositional hloov pauv hloov cov ntaub ntawv tsis kam rau graphitization.
Graphitization yog ib qho tshwm sim ntawm metallurgical qhov twg, ntawm qhov kub ntawm kwv yees li ntawm 315℃mus rau 600℃(600℃F txog 1112℃F), cov pa roj carbon nyob rau hauv cov nickel matrix tuaj yeem ua rau cov graphite. Cov nag lossis daus no cuam tshuam cov khoom siv ductility, cuam tshuam lub zog, thiab tag nrho cov qauv kev ncaj ncees, ua rau embrittlement. Nickel 200 muaj kev cuam tshuam rau qhov teeb meem no nyob rau hauv lub sij hawm siab siab -kev pab kub. Yog li ntawd, Nickel 201 seamless kav yog tsim tshwj xeeb rau cov ntawv thov uas xav kom muaj kev kub ntxhov siab tshaj 315 degree. Kev lag luam xws li cov khoom siv hluavtaws (tshwj xeeb rau yaj{12}} cov twj spinning), caustic evaporators ua haujlwm ntawm qhov kub siab, thiab siab - cov khoom siv tshuaj ua kom kub siab rau UNS N02201 cov kav dej kom ntseeg tau ntev -lub sij hawm kev ruaj ntseg thiab ua rau cov pa roj carbon monoxide ua rau muaj kev cuam tshuam. Rau ambient mus rau nruab nrab qhov kub thiab txias, Nickel 200 tseem yog tus nqi - kev xaiv zoo, tab sis rau siab - qhov kub thiab txias, Nickel 201 yog qhov yuav tsum tau ua tshwj xeeb.
2. Q: Nyob rau hauv cov ntsiab lus ntawm kev lag luam tshuaj, dab tsi tshwj xeeb corrosive ib puag ncig ua rau Nickel 201 Seamless Pipe cov khoom ntawm kev xaiv dua austenitic stainless hlau los yog lwm yam nickel alloys?
A: Kev lag luam tshuaj lom neeg ua haujlwm (CPI) feem ntau cuam tshuam nrog ib puag ncig uas cuam tshuam rau cov txheej txheem alloys xws li Hom 316L stainless hlau, tshwj xeeb tshaj yog nyob rau hauv cov tshuaj chlorides, caustics, thiab fluorides. Nickel 201 seamless kav ua tau zoo nyob rau hauv ob qhov chaw ib puag ncig: concentrated caustic alkalis thiab qhuav halogen gases.
Ua ntej, Nickel 201 yog cov khoom siv tseem ceeb tshaj plaws rau kev tuav cov sodium hydroxide (NaOH) thiab potassium hydroxide (KOH), tshwj xeeb tshaj yog nyob rau hauv high concentrations thiab kub siab. Thaum cov hlau tsis muaj hlau tsis tshua muaj chloride stress corrosion cracking (SSC) thiab caustic embrittlement nyob rau hauv cov mob no, Nickel 201 khaws nws cov ductility thiab corrosion kuj. Nws nthuav tawm cov nqi tsis txaus ntseeg nyob rau hauv ib puag ncig caustic mus txog qhov chaw ntawm nws qhov melting point, yog tias oxidizing cov kab mob xws li oxygen lossis ferric ntsev tsawg. Qhov no ua rau nws indispensable rau caustic evaporators, concentrators, thiab thauj piping nyob rau hauv zus tau tej cov chlorine, rayon, thiab ntau yam organic tshuaj.
Thib ob, Nickel 201 muaj kev tiv thaiv zoo rau cov halogens qhuav, tshwj xeeb tshaj yog fluorine thiab chlorine, ntawm qhov kub thiab txias. Tsis zoo li cov hlau tsis muaj steel, uas tuaj yeem raug kev txom nyem los ntawm pitting lossis kev ntxhov siab corrosion tawg nyob rau hauv lub xub ntiag ntawm halides, Nickel 201 tseem ruaj khov. Tsis tas li ntawd, nws cov ntsiab lus carbon tsawg ua kom ntseeg tau tias txawm tias muaj qhov me me thaum lub sij hawm vuam, qhov kev pheej hmoo ntawm intergranular corrosion yog negligible. Txawm li cas los xij, nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias Nickel 201 tsis haum rau oxidizing acids (xws li nitric acid) los yog ib puag ncig nrog cov qib siab oxidizing ntsev, qhov twg alloys xws li Hastelloy C-276 lossis titanium yuav tsim nyog dua.
3. Q: Dab tsi yog qhov tseem ceeb ntawm kev tsim khoom, tshwj xeeb yog vuam thiab kev kho cua sov, thaum ua haujlwm nrog Nickel 201 Seamless Yeeb Nkab (UNS N02201) kom tswj tau nws cov kev tiv thaiv corrosion thiab kev ua haujlwm zoo?
A: Fabricating Nickel 201 seamless yeeb nkab yuav tsum muaj ib txoj hauv kev sib txawv piv rau carbon steel los yog austenitic stainless hlau, feem ntau vim nws cov thermal conductivity, tsis tshua muaj rigidity, thiab rhiab heev rau tej yam kab mob. Kev ua tau zoo ntawm cov pob khawm ntawm peb tus ncej: kev huv, kev xaiv hlau muab tub lim, thiab tswj cov cua sov.
Kev huv huv yog qhov tseem ceeb. Ua ntej welding, cov yeeb nkab saum npoo thiab thaj chaw vuam yuav tsum tau ua tib zoo degreased thiab ntxuav ntawm txhua yam sulfur, txhuas, lossis qis- melting- taw tes hlau. Cov kab mob xws li roj, roj, lossis cov cwj mem kos tuaj yeem ua rau muaj kev tsis haum xeeb (kua hlau embrittlement) lossis kub tawg thaum lub vuam. Cov cuab yeej stainless hlau lossis cov npib tsib xee tshwj xeeb- cov cuab yeej alloy yuav tsum tau siv kom tsis txhob muaj cov kab mob hlau, uas tuaj yeem tsim cov galvanic corrosion tom qab kev pabcuam.
Hais txog kev siv vuam, cov hlau tsis tshua muaj dej thiab kub siab -kev tawg yooj yim yuav tsum tau siv cov hlau sib txuam, feem ntau UNS N02201 muab tub lim. Cov ntsiab lus tsis tshua muaj carbon nyob rau hauv cov muab tub lim kom ntseeg tau tias cov khoom siv vuam ua haujlwm zoo tib yam rau graphitization raws li lub hauv paus hlau. Cov txheej txheem vuam zoo li Gas Tungsten Arc Vuam (GTAW / TIG) nyiam rau lawv qhov tseeb. Vim yog Nickel 201 lub siab coefficient ntawm thermal expansion (zoo ib yam li carbon steel) tab sis qis thermal conductivity tshaj tooj liab, welders yuav tsum tswj cov cua kub kom zoo zoo kom tsis txhob muaj kev cuam tshuam ntau dhau thiab cuam tshuam qhov kub thiab txias uas tuaj yeem ua rau cov qoob loo loj hlob.
Raws li kev tshaj tawm -weld kev kho cua sov, ib qho ntawm qhov zoo ntawm Nickel 201 yog tias nws tsis yog ib txwm raug rau kev tshaj tawm -weld heat treatment (PWHT) rau corrosion resistance. Tsis zoo li carbon steels, uas feem ntau xav tau kev ntxhov siab, Nickel 201 tsis teb rau kev kho cua sov rau hardening. Qhov tseeb, PWHT feem ntau poob siab tshwj tsis yog tias cov yeeb nkab tau txias heev - ua hauj lwm thiab yuav tsum tau annealing los kho ductility. Yog tias ua tau, qhov kub thiab txias feem ntau yog nyob nruab nrab ntawm 705℃thiab 925℃(1300℃F–1700℃F), ua raws li qhov txias txias kom tsis txhob muaj nag lossis daus{12}}txawm hais tias nrog cov ntsiab lus carbon tsawg ntawm N02201, qhov kev pheej hmoo no raug txo kom tsawg.
4. Q: Dab tsi tshwj xeeb cov cuab yeej siv tshuab thiab cov qauv tsim khoom tswj hwm kev siv Nickel 201 Seamless Pipe nyob rau hauv siab -kub, siab - kev siv zog xws li kev tsim hluav taws xob lossis aerospace?
A: Nickel 201 seamless kav siv nyob rau hauv xav tau sectors xws li lub zog tsim thiab aerospace yuav tsum ua raws li ASTM thiab ASME specifications nruj me ntsis kom muaj kev nyab xeeb thiab kev ua tau zoo nyob rau hauv thermal thiab mechanical stress. Cov qauv kev tswj hwm tseem ceeb yog ASTM B161 (Standard Specification rau Nickel Seamless Yeeb Nkab thiab Tube) thiab ASME SB161, uas txiav txim siab cov tshuaj muaj pes tsawg leeg, cov khoom siv kho tshuab, thiab kev ua haujlwm ntev.
Mechanically, UNS N02201 nthuav tawm cov yam ntxwv tshwj xeeb uas zoo rau kev ua haujlwm siab - kub. Txawm hais tias nws tsis muaj lub zog tensile siab ntawm nag lossis daus- cov khoom siv tawv tawv, nws muaj qhov tshwj xeeb ductility thiab khaws cia cov creep kuj tseem ceeb ntawm qhov kub siab. Cov kev xav tau ntawm cov neeg kho tshuab zoo ib yam ASTM B161 suav nrog lub zog tensile yam tsawg kawg nkaus ntawm 55 ksi (380 MPa) thiab qhov tsawg kawg nkaus yield zog ntawm 15 ksi (105 MPa) rau cov mob annealed. Txawm li cas los xij, nws qhov elongation yog qhov tshwj xeeb siab, feem ntau tshaj 40%, uas yooj yim khoov thiab tsim thaum lub sij hawm fabrication.
Rau siab - cov ntawv thov siab, cov txheej txheem tsim khoom seamless yog qhov tseem ceeb. Seamless kav yog nyiam dua welded lwm yam nyob rau hauv volatile ib puag ncig vim hais tias lawv tshem tawm cov weld seam raws li ib tug tej zaum tsis ua hauj lwm point nyob rau hauv cyclic thermal stress los yog siab. Cov khoom muaj peev xwm tswj tau oxidation tsis kam mus txog li ntawm 760℃(1400℃F) hauv kev txo qis lossis nruab nrab cua ua rau nws tsim nyog rau cov khoom xws li cov hlab ntsha reactor, kub exchangers, thiab turbine seals hauv kev lag luam fais fab. Thaum qhia txog cov kav dej no rau cov cai- cov ntawv tsav tsheb, cov kws ua haujlwm xa mus rau ASME Boiler thiab Pressure Vessel Code (Section VIII, Division 1), qhov twg Nickel 201 tau lees paub hauv ASME SB-161. Cov neeg tsim qauv yuav tsum siv cov txiaj ntsig kev ntxhov siab uas tsim nyog tau muab hauv Tshooj II, Ntu D, uas suav nrog cov khoom siv txo qis zog ntawm qhov kub siab.
5. Q: Tshaj li ntawm cov khoom siv tshuaj, dab tsi yog qhov tshwj xeeb niche daim ntaub ntawv qhov twg Nickel 201 Seamless Yeeb Nkab cov cim ua ke ntawm magnetic permeability, thermal conductivity, thiab corrosion kuj muab ib qho txiaj ntsig zoo dua?
A: Thaum Nickel 201 ua kev zoo siab rau nws txoj kev tiv thaiv corrosion, nws lub cev muaj zog -tshwj xeeb nws cov yam ntxwv sib nqus thiab thermal conductivity- ua rau nws tseem ceeb hauv siab -precision electronic, semiconductor, thiab aerospace applications.
Ib qho tseem ceeb niche yog nyob rau hauv kev tsim cov khoom siv hluav taws xob thiab cov khoom siv semiconductor fabrication. UNS N02201 nthuav tawm tsis tshua muaj hlau nplaum permeability, feem ntau tsawg dua 1.005 nyob rau hauv cov mob annealed. Hauv cov khoom siv hluav taws xob semiconductor, txawm tias me me hlau nplaum hauv cov kav dej lossis cov khoom siv txheej txheem tuaj yeem cuam tshuam nrog cov plasma rhiab heev, cov kab hluav taws xob, lossis wafer tuav cov tshuab, ua rau muaj qhov tsis xws luag hauv microchips. Yog li ntawd, Nickel 201 seamless kav yog siv los xa ultra- siab- purity gases (xws li silane los yog hydrogen) nyob rau hauv semiconductor cleanrooms uas tuav ib tug uas tsis yog -magnetic ib puag ncig yog ib qho tseem ceeb los khaws cov teeb liab kev ncaj ncees thiab cov txheej txheem yields.
Lwm daim ntawv thov tshwj xeeb suav nrog kev tsim cov pob zeb diamond hluavtaws thiab fiber ntau optics. Cov kev lag luam no siv high-siab, siab-kub (HPHT) presses. Nickel 201 yog ua haujlwm rau cov kav dej hauv cov tshuab no vim nws sib txuas oxidation tsis kam nrog thermal conductivity zoo. Cov hlau nplaum thermal conductivity (kwv yees li 70 W / m·K ntawm chav tsev kub) yog siab dua li ntawm cov hlau tsis muaj austenitic (kwv yees . 15 W / m·K). Qhov no tso cai rau kom muaj cua sov ua kom zoo nyob rau hauv siab -kub hydraulic kab thiab cov tshuab cua txias uas cuam tshuam nrog cov xovxwm no.
Tsis tas li ntawd, nyob rau hauv aerospace thiab kev tiv thaiv sectors, Nickel 201 seamless tubing yog siv rau tseem ceeb hydraulic kab thiab instrumentation kab uas cov kua xov xwm tej zaum yuav reactive heev reactive (xws li tej yam roj los yog hydraulic kua) thiab qhov twg lub system yuav tsum tsis muaj -ferromagnetic zog kom tsis txhob cuam tshuam nrog rhiab navigational los yog nrhiav kom tau cov khoom. Nws muaj peev xwm tswj tau qhov ductility ntawm qhov kub thiab txias, mus rau -196℃(-321℃F), kuj ua rau nws haum rau cov kua hydrogen thiab cov pa oxygen hloov cov kab hauv lub foob pob hluav taws, qhov sib xyaw ua ke ntawm cov khoom tsis sib nqus, qhov kub thiab txias resilience, thiab cov xau-nruj siab yog tsis sib tham.
