Nrov Science ntawm Hastelloy C276 Vuam Tshuab
Tam sim no, Hastelloy tau siv dav hauv ntau qhov chaw xws li roj av, tshuaj lom neeg kev lag luam, thiab kev tiv thaiv ib puag ncig txawv teb chaws. Nws kuj tau siv me me hauv Suav teb. Txawm li cas los xij, hauv thaj tsam ntawm lub zog nuclear, tsuas yog Tebchaws Meskas thiab lwm lub tebchaws tau siv rau hauv kev tsim hluav taws xob nuclear. Nws tseem nyob hauv Suav teb. Qhov teeb meem tseem ceeb tam sim no yog niam txiv Cov ntaub ntawv tseem ceeb raug xa mus, thiab cov ntaub ntawv tseem ceeb yog coj los ntawm cov chaw tshawb fawb tshawb fawb. Lawv qhov kev ua tau zoo tsis yog qhov tseeb tshwj xeeb, tshwj xeeb tshaj yog kev tiv thaiv corrosion ntawm qhov kub thiab txias. Lub ntsiab lus tseem ceeb ntawm kev tshawb fawb no yog xaiv cov khoom siv C276 uas tuaj yeem yuav los ntawm Hastelloy ua cov khoom siv. Rau thawj theem ntawm txoj haujlwm, los ntawm kev xaiv cov khoom siv vuam tsim nyog thiab cov txheej txheem, peb tuaj yeem txiav txim siab qhov vuam specifications uas ua tau raws li cov khoom yuav tsum tau ua, kom lawv muaj nuj nqis ua haujlwm.
Hastelloy nws tus kheej yog npib tsib xee-raws li alloy, tab sis nws txawv ntawm zoo tib yam npib tsib xee (Ni200) thiab Monel. Nws siv chromium thiab molybdenum ua lub ntsiab alloy, aiming los txhim kho nws adaptability rau ntau yam xov xwm thiab kub, thiab yuav siv tau nyob rau hauv txawv industries. Tshwj xeeb optimization tau ua tiav. Tam sim no, kev lag luam tshuaj lom neeg feem ntau nrhiav kev tsim khoom siab thiab niaj hnub txhim kho cov txheej txheem kom nce qhov kub thiab txias kom ceev cov tshuaj tiv thaiv. Nyob rau hauv txoj kev no, kev tsim khoom yog ua rau cov xwm txheej npaj txhij txog, ua rau tsis muaj kev tu ncua. Hastelloy yog lub hom phiaj meej ntawm qhov kev thov, hloov mus rau ntau qhov chaw hnyav uas tsis tuaj yeem pom thiab txo qis kev saib xyuas tsis tau npaj tseg. Nyob rau tib lub sijhawm, nws kuj muaj kev ua haujlwm zoo thiab vuam kev ua tau zoo thiab ua kom yooj yim rau kev saib xyuas ntawm qhov chaw.
C series alloys yog nickel-chromium molybdenum alloys. Vim tias chromium tuaj yeem tsim cov oxide zaj duab xis ntom ntom (passivation) ntawm qhov chaw ntawm cov hlau, nws muab kev tiv thaiv rau oxidizing ib puag ncig, thaum chromium feem ntau muab kev tiv thaiv kom tsis txhob muaj ib puag ncig. Yog li, C series alloys tuaj yeem siv rau hauv ib puag ncig nrog oxidizing thiab txo cov xov xwm. C series alloys yog cov khoom siv dav tshaj plaws, tshwj xeeb tshaj yog C-276 alloys. Txij li thaum nws qhov kev tsim tawm hauv xyoo 1960, nws tseem pom muaj zog heev tom qab ntau tshaj 40 xyoo ntawm kev sim. Tam sim no, C series alloys tau siv nyob rau hauv ob peb lub lag luam hauv Suav teb. Series alloys.
Qhov kev tshawb fawb no siv cov khoom siv hauv tsev C276, xaiv ob qhov tshwj xeeb ntawm phaj tuab, 2mm thiab 6mm, txiav txim siab cov txheej txheem vuam sib txuas, thiab txiav txim siab
Txiav txim siab seb qhov vuam xeem daim nyob rau hauv cov txheej txheem vuam ua tau raws li qhov yuav tsum tau ua ntawm micro-corrosion raws li qhov kub ntawm lub xeev ntawm nuclear fais fab, tsim cov txheej txheem vuam specifications, thiab ua kom tiav cov txheej txheem vuam cov ntaub ntawv rau cov specifications thiab thickness, thiab tsim cov txheej txheem vuam txheej txheem. haum rau nuclear fais fab kev xav tau los coj txoj haujlwm tsim.
2. Kev tshuaj xyuas thiab kev ntsuas ntawm cov txheej txheem kev nyuaj hauv cov txheej txheem vuam
C276 (UNSN10276) alloy yog npib tsib xee-molybdenum-ferrochromium-tungsten alloy, uas yog tam sim no feem ntau corrosion-resistant alloy. C276 alloy tau siv ntau xyoo hauv kev tsim kho engineering ntsig txog cov hlab ntsha thiab lub siab li qub raws li ASME Standards. Lub alloy tshwm nyob rau hauv ntau yam khoom siv nyob rau hauv Tshooj 1 thiab 8 ntawm ASME Standard Regulations. Ntu Ob.
Txawm hais tias C276 alloy thaum kawg yuav nkig nyob rau hauv qhov kub thiab txias, nws kuj muaj qhov kub thiab txias zog thiab nruab nrab oxidation kuj. Cov ntsiab lus siab molybdenum muab cov alloy tsis kam rau hauv zos corrosion. Cov ntsiab lus tsis tshua muaj cua sov ntawm cov alloy minimizes nag lossis daus ntawm carbides thaum vuam. Yuav kom tswj tau qhov tsis kam mus rau cov khoom siv corrosion ntawm thermally deteriorated qhov chaw ntawm vuam interface.
(1) Weldability tsom xam: Cov hluav taws xob conductivity thiab thermal conductivity ntawm Hastelloy yog tsawg dua li cov pa roj carbon tsawg, thaum lub sij hawm resistivity thiab expansion tus nqi yog ntau dua li cov roj carbon tsawg. Lub pas dej molten muaj cov dej tsis zoo, tsis muaj dej tsis zoo, thiab kev nkag mus Lub zog me me thiab qhov tob tob tob yog qhov tob. Yog li ntawd, qhov tsis xws luag xws li pores, kub tawg, vuam tsis tiav, thiab tsis tiav fusion yog nquag tshwm sim.
Yog vim li cas rau qhov pores: Kev kho bevel ntawm Hastelloy alloy ua ntej vuam tsis huv, huab cua yog ntub, lub pas dej molten tsis muaj kev tiv thaiv zoo thaum lub sij hawm vuam, thiab hydrogen, nitrogen thiab lwm yam gases yooj yim nkag mus rau hauv lub pas dej molten. Vim qhov sib txawv me me ntawm cov khoom thiab cov kua theem ntawm cov hlau thiab cov fluidity tsawg, cov roj insoluble tsis muaj sij hawm los khiav thaum lub sij hawm solidification thiab tseem nyob rau hauv weld tsim pores.
Kub tawg; low-body intergranular kua zaj duab xis tsim los ntawm impurities xws li phosphorus thiab vuam tensile kev nyuaj siab yog metallurgical yam uas ua rau vuam kub tawg. Txij li thaum lub alloy weld muaj ib tug dendritic qauv, ib co low-melting-point eutectic thiab low-melting-point kub yog concentrated nyob rau hauv ciam teb ntawm coarse nplej.
genus, tshwj xeeb tshaj yog Ni-S eutectic (melting point yog 645 degree) thiab Ni-P eutectic (melting point yog 880 degree). Lawv tau muab faib rau hauv ib zaj duab xis nyias ntawm cov ciam teb ntawm cov nplej thiab ua rau cov kab nrib pleb nyob rau hauv qhov kev txiav txim ntawm vuam kev nyuaj siab.
Kev huv huv yog ib qho tseem ceeb tshaj plaws ntawm vuam corrosion-resistant nickel-based alloys. Cov kab mob kis tau los ntawm cov roj, cov khoom siv corrosion, txhuas, sulfur, thiab lwm yam khoom uas muaj cov ntsiab lus ci qis tuaj yeem ua rau muaj teeb meem tawg loj. Txhawm rau ua kom cov vuam zoo, qhov vuam tiv thaiv cheeb tsam thiab vuam hlau ntawm cov vuam yuav tsum nruj me ntsis thiab ua tib zoo ntxuav ua ntej vuam.
Nws yog ib qho yooj yim rau oxidize, thiab Ni thiab Cr atoms nyob rau hauv cov hlau yog heev nquag. Lub vuam seam yog yooj yim oxidized thaum lub alloy yog welded. Nyob rau hauv cov xwm txheej hnyav, nws ua zoo li taum paj, uas ua rau lub zog corrosion ntawm cov hlau poob qis heev. Nws kuj yog lub ntsiab ua rau tawg. Yog li ntawd, kev tiv thaiv chlorine yuav tsum muaj zog thaum lub sij hawm vuam. Nyob rau tib lub sijhawm, vuam hlau feem ntau yuav tsum nyias li sai tau (1.2 ~ 2.4mm). Cov txheej txheem vuam me me yuav pab tau kom them nyiaj rau qhov kub ntawm qhov poob ntawm qee cov ntsiab lus thaum lub sij hawm vuam thiab kev puas tsuaj rau vuam tawg thiab qhov pores. tswj.
Ntxuav cov av av; Txhua yam av seem xws li cov khib nyiab hlau, abrasive plua plav, plua plav, thiab lwm yam ntawm cov ntoo tsis pub dhau 40 hli ntawm C276 alloy welded sib koom los ntawm qhov zawj yuav tsum tau muab tshem tawm nrog austenitic stainless hlau hlau txhuam thiab ntxuav cov xov paj tshiab. Ntxuav kom huv si. Cov cuab yeej siv yuav tsum yog tshwj xeeb thiab cov ntawv xuab zeb thiab carbon hlau txhuam tsis raug tso cai.
(2) Cov teeb meem muaj xws li vuam deformation tswj, vuam backside tiv thaiv, thiab kev tshawb fawb txog corrosion kuj ntawm welded specimens.
Acetone (los yog cawv) tu; siv acetone los yog cawv los ntxuav qhov zawj ntawm qhov chaw ua ntej vuam kom tshem tawm cov roj saum npoo thiab lwm yam impurities, thiab ntsuas yuav tsum tau coj los tiv thaiv cov pa phem thib ob.
(3) Kev ntsuas Kev ntsuas txhawm rau tiv thaiv kev loj hlob ntawm cov qoob loo thiab phosphide nag lossis daus hauv thaj chaw weld thiab cua sov, feem ntau yuav tsum siv cov khoom siv hluav taws xob tsawg. Txawm li cas los xij, cov nickel-based alloy molten pool hlau muaj cov dej tsis zoo thiab qhov tob tob, uas yooj yim ua rau cov pob qij txha tsis zoo. Lub tshav kub input ntawm dispersion vuam tsis tuaj yeem me me dhau. Qhov kev daws teeb meem yog siv qhov nruab nrab welding tam sim no, siab vuam ceev, thiab tswj cov vuam cua sov input los ntawm kev txo qhov kub ntawm qhov chaw nyob.
(4) Kev xaiv ntawm vuam tsis: xeem phaj specifications: 2mm, 6mm; vuam hlau qauv thiab specifications; ERNiCrMo-4, φ2.4mm; zawj daim ntawv; daim ntawv zawj ntawm qhov sib koom ua ke yog qhia hauv daim duab 1.
Txhawm rau txhim kho qhov tawg tsis kam thiab corrosion tsis kam ntawm vuam, tshwj xeeb yuav tsum tau them nyiaj rau kev tu qhov chaw vuam thaum lub sij hawm vuam kom tsis txhob muaj teeb meem impurities los ntawm melting rau hauv vuam.
Preheating feem ntau tsis tas yuav tsum tau thaum vuam. Txhawm rau tiv thaiv kev loj hlob ntawm cov qoob loo thiab carbide nag lossis daus hauv thaj chaw weld thiab tshav kub, qhov kub ntawm qhov sib txuas yuav tsum tau tswj ntawm qhov qis. Feem ntau tsis tshaj 100 degree
