1. Dab tsi yog qhov tseem ceeb ntawm kev siv UNS N06002 hauv daim ntawv phaj piv rau cov yeeb nkab lossis cov raj, thiab qhov no cuam tshuam li cas rau nws cov kev siv?
Thaum UNS N06002 (Haynes 230®) muaj qhov zoo sib xws ntawm - qhov kub thiab txias thoob plaws txhua hom khoom, nws siv raws li phaj Tshuag hauv paus hloov nws daim ntawv thov los ntawm kev xa xov xwm los ua cov khoom tsim thiab tsim khoom rau siab - qhov kub thiab txias. Qhov tuab thiab thaj tsam ntawm phaj- feem ntau yog li ntawm 3/16 nti (4.8mm) mus rau ob peb ntiv tes tuab - pab kom nws siv tau hauv kev thauj khoom-cov kabmob thiab cua sov- cov ntawv thov ntim qhov twg tubing tsis txaus.
Cov ntawv tseem ceeb- cov ntawv thov tshwj xeeb suav nrog:
• Rauv thiab Combustor Structure Cheebtsam: Siv rau burner daim hlau, baffles, tshav kub shields, thiab txhawb cov qauv nyob rau hauv industrial heaters, forging furnaces, thiab roj turbine combustors. Nws lub zog ntawm qhov kub thiab txias tiv thaiv sagging thiab distortion.
• Heat Exchanger Headers thiab Manifolds: Cov phaj tuab yog machined los yog tsim rau hauv headers rau compact heat exchangers, qhov twg nws yuav tsum tiv taus siab -siab, siab - kub gases.
• Reformer thiab Cracker Internals: Hauv kev ua tshuaj lom neeg, phaj yog tsim rau hauv catalyst txhawb daim phiaj, radiant tube nplooj ntawv, thiab lwm yam loj sab hauv Cheebtsam rau chav methane reformers thiab ethylene crackers.
• Weld Overlays and Repairs: Phaj Tshuag yog qee zaum siv los ua qhov chaw rau vuam hlau los yog sawb los npog cov substrates tsawg dua, tiv thaiv lawv hauv thaj chaw siab - tshav kub.
Thawj qhov kev xav txog engineering rau phaj txawv ntawm cov yeeb nkab: ua kom pom tseeb dua los ntawm -cov khoom tuab, thermal stress gradients hla ntu, thiab cov txheej txheem tsim xws li kev tsim hnyav thiab machining yog qhov tseem ceeb.
2. Cov kev sib tw tshwj xeeb dab tsi yog cuam tshuam nrog kev siv tshuab, txiav, thiab tsim UNS N06002 phaj, thiab lawv yuav daws li cas?
Fabricating N06002 phaj yuav tsum muaj cov txheej txheem hloov kho rau nws txoj haujlwm siab - tus nqi hardening thiab lub zog ntawm qhov kub siab. Nws yog machinable thiab formable, tab sis tseem ceeb caveats.
Machining:
• Cov cuab yeej: Yuav tsum muaj kev teeb tsa nruj thiab zoo- cov cuab yeej carbide ntse. Ceramic lossis CBN (cubic boron nitride) cov cuab yeej raug pom zoo rau kev ua haujlwm hnyav lossis tig. Cov cuab yeej hnav yog siab dua nrog cov hlau tsis muaj steel.
• Parameters: Siv qis- mus rau- nrawm nrawm nrog tus nqi pub dawb, nruab nrab. Tsis txhob cia lub cuab yeej nyob los yog rub, vim qhov no ua haujlwm sai heev - ua kom tawv nqaij, ua rau kev nyuaj tom ntej. Siv dav dav, siab -lub siab ua kom txias los tswj cov cua sov thiab cov chips ntshiab.
• Sib tsoo: Siv cov txhuas oxide lossis silicon carbide lub log nrog lub teeb siab kom tsis txhob tsim cov cua sov hauv zos- cov cheeb tsam cuam tshuam uas tuaj yeem cuam tshuam oxidation tsis kam.
Txiav:
• Plasma Arc Txiav: Tus qauv txheej txheem rau cov phaj profile. Nws tawm hauv txheej txheej rov ua dua tshiab (Teb Chaws Kub Kub) ntawm kwv yees li 0.020-0.040 ntiv tes (0.5-1mm) uas nyuaj thiab tej zaum yuav muaj kev hloov pauv microstructure. Cov txheej no yuav tsum tau muab tshem tawm los ntawm kev siv tshuab lossis kev sib tsoo ua ntej qhov kev pabcuam kub kub los tiv thaiv cov ntsiab lus pib rau kev tawg lossis txo oxidation tsis kam.
• Waterjet Txiav: Ib qho kev xaiv zoo heev vim nws tsim tsis muaj HAZ, khaws cia cov khoom siv hlau puag. Nws yog qhov zoo tagnrho rau cov duab tsis yooj yim tab sis qeeb dua thiab kim dua rau cov phaj tuab.
Kev tsim:
• Cold forming: Muaj peev xwm khoov me ntsis, tab sis yuav tsum muaj zog ntau dua li cov pa roj carbon steel. Qhov tsawg kawg nkaus khoov vojvoog yog feem ntau 4-5 npaug ntawm phaj tuab (T) rau 90-degree khoov kom tsis txhob tawg. Annealing ntawm cov kauj ruam tsim hnyav yuav tsim nyog.
• Kev Ua Kub Kub: Rau qhov nyuaj lossis nruj- cov duab vojvoog, kub sib sau ntawm 1600℃F thiab 2250℃F (870℃- 1230℃) yog siv tau. Cov khoom yuav tsum tau tom qab cov tshuaj annealed thiab sai quenched kom rov qab nws cov microstructure zoo thiab corrosion / oxidation zog.
3. Yuav ua li cas lub thermal stability ntawm UNS N06002 phaj cuam tshuam nws kev ua tau zoo nyob rau hauv cyclic cua sov thiab txias daim ntaub ntawv, thiab dab tsi tsim mitigations yog siv?
Qhov tshwj xeeb thermal stability ntawm N06002 yog ib qho ntawm nws cov txiaj ntsig zoo rau daim ntawv thov phaj raug rau thermal cycling, tab sis tus tsim yuav tsum tseem suav nrog qhov sib txawv ntawm kev nthuav dav thiab kev ntxhov siab.
Kev Ua Haujlwm Hauv Cycling:
• Resistance to Embrittlement: Tsis zoo li ntau cov alloys uas tsim nkig sigma los yog Laves theem tom qab lub sij hawm siab -kub raug, N06002's chemistry (sib npaug W, Mo, nrog me me La thiab B ntxiv) zoo kawg nkaus tiv cov kev hloov pauv tsis zoo. Qhov no txhais tau hais tias daim hlau khaws cov ductility thiab toughness tom qab ntau txhiab teev ntawm kev pabcuam, tseem ceeb heev rau cov khoom uas yuav tsum tau kaw thiab pib ua haujlwm tsis tu ncua.
• Oxide Scale Adherence: Cov hlau ua ib qho nyias, tuab, thiab ua raws chromium oxide nplai. Qhov ntsuas no muaj cov coefficient zoo sib xws ntawm thermal expansion mus rau lub hauv paus hlau, yog li nws tiv taus spalling (flaking tawm) thaum lub sij hawm thermal. Spalling yog kev puas tsuaj vim nws nthuav tawm cov hlau tshiab rau oxidation, ua rau cov hlau poob sai. Cov cuab yeej no yog qhov tseem ceeb rau cov hlau thaiv hluav taws xob.
Design Mitigations rau Thermal Stress:
• Kev them nyiaj yug yooj yim: Tsim cov kev txhawb nqa uas tso cai rau kev nthuav dav sab nraud / kev sib cog lus tiv thaiv kev tsim cov kev ntxhov siab thermal.
• Kev hloov maj mam: Zam cov kaum ntse ntse thiab siv cov radii dav dav hauv cov phaj tsim kom txo tau cov ntsiab lus kev ntxhov siab uas cov thermal qaug zog tuaj yeem pib.
• Tswj cov cua sov / cua txias: Rau cov phaj tuab tuab heev, cov txheej txheem ua haujlwm qhia txog qhov siab tshaj plaws cua sov thiab cua txias yuav pab txo qis los ntawm - thickness thermal gradients thiab cuam tshuam cov kev ntxhov siab.
4. Rau weld fabrication ntawm cov phaj hnyav, cov txheej txheem vuam thiab kev sib koom ua ke tau pom zoo los tswj cov khoom los ntawm kev vuam thiab HAZ?
Vuam N06002 phaj, tshwj xeeb tshaj yog nyob rau hauv thicknesses tshaj 1/2 nti (12.7mm), yuav tsum tau cov txheej txheem uas tswj cov cua sov input los tuav lub alloy stability.
Cov txheej txheem vuam pom zoo:
Gas Tungsten Arc Vuam (GTAW/TIG): Nyiam rau cov hauv paus hla thiab nyias phaj vim muaj kev tswj xyuas zoo thiab kev huv.
Shielded Hlau Arc Vuam (SMAW): tuaj yeem siv nrog cov khoom siv electrodes (piv txwv li, Haynes 230® electrode) rau txhua txoj haujlwm, tab sis kev tshem tawm slag yuav tsum tau ceev faj.
Gas Hlau Arc Vuam (GMAW/MIG): Ua tau zoo rau kev sau cov grooves loj hauv cov phaj tuab. Siv hom hloov pauv hloov mus rau kev tswj kom zoo dua thiab txo cov cua sov nkag.
Submerged Arc Vuam (SAW): Tsim nyog rau ntev, ncaj welds ntawm tuab tuab heev nyob rau hauv txoj hauj lwm tiaj tus, muab siab deposition nqi. Kev xaiv Flux yog qhov tseem ceeb thiab yuav tsum tau tsim tshwj xeeb rau npib tsib xee-puag alloys kom tsis txhob muaj silicon khaws thiab tswj kev tiv thaiv corrosion.
Joint Design & Vuam Parameters:
• Joint Design: Use single or double V-groove/U-groove preparations for plate over 3/8" thick. Include a root face and gap to ensure full penetration. For very thick plate (>2"), nqaim- qhov sib txawv ntawm qhov sib txuas tsim kom txo qis qhov ntim thiab qhov sib txawv.
• Preheat & Interpass Kub: Preheat tsis tas yuav tsum tau lossis pom zoo vim muaj kev pheej hmoo ntawm carbide nag lossis daus. Interpass kub yuav tsum nruj me ntsis tswj hauv qab 300℃F (150 degree). Siv cov vuam sib txuas los yog hla vuam ntawm cov khoom loj los tswj cov cua sov.
• Filler Metal: ERNiCrWMo-1 (AWS A5.14) yog qhov sib txuam muab tub lim, qhov tseem ceeb rau kev tswj hwm qhov kub thiab txias zoo sib xws thiab oxidation tsis kam ntawm cov hlau vuam.
• Tshaj tawm -Kev kho cua sov: Feem ntau tsis tas yuav tsum muaj rau N06002. Lub alloy qhov ruaj khov txhais tau hais tias qhov zoo li -welded mob yog feem ntau txais tau rau siab - qhov kub thiab txias. Kev ntxhov siab (SR) yog qhov nyuaj thiab feem ntau zam; Yog hais tias tsim nyog los ntawm kev tsim qauv rau qhov seem stability, nws yuav tsum tau ua raws li cov lus qhia nruj (xws li, 1975℃F / 1080℃tom qab ceev ceev quench).
5. Dab tsi yog cov ntaub ntawv pov thawj tseem ceeb, traceability, thiab kev xeem yuav tsum tau ua rau UNS N06002 phaj siv hauv ASME-cov cuab yeej siv siab los yog qhov tseem ceeb siab - cov qauv kub?
Rau cov cai-raws li txoj cai lossis lub hom phiaj- cov ntawv thov tseem ceeb, daim ntawv pov thawj phaj mus dhau ntawm daim ntawv qhia txog kev sim yooj yim.
Cov ntaub ntawv yuav tsum tau:
• ASME Khoom Specification: Phaj yuav tsum tau muab rau ASME SB-435 rau cov khoom lag luam tiaj tus (phaj, ntawv, sawb).
• Certified Mill Test Report (CMTR): Yuav tsum muaj xws li cua sov chemistry txheeb xyuas kev ua raws li UNS N06002 txwv (tshwj xeeb tshaj yog Cr, W, Mo, La, C), cov txiaj ntsig ntawm kev sim tshuab (tensile, yield, elongation at room temp), thiab hardness. Rau siab - cov ntawv siv kub, qhov kub siab tensile lossis creep cov ntaub ntawv los ntawm cov cua sov yuav raug teev.
• Cov khoom siv Traceability: Txhua lub phaj yuav tsum tau cim nrog tus lej xov tooj cua sov thiab, yog tias tsim nyog, ASME "N" stamp rau cov khoom siv nuclear. Qhov no traceability yuav tsum tau khaws cia los ntawm tag nrho cov txiav thiab fabrication kauj ruam ntawm cov ntaub ntawv mus txawv tebchaws.
Kev Xeem Ntxiv (feem ntau qhia los ntawm tus tsim):
• Kev Ntsuas Ultrasonic (UT): Raws li ASTM A578 lossis zoo sib xws, txhawm rau txheeb xyuas cov laminations sab hauv, suav nrog, lossis kev tsis sib xws uas tuaj yeem ua rau muaj kev puas tsuaj rau cov phaj tuab hauv qab kev ntxhov siab. Qib I (txoj kab ncaj nraim) muaj ntau; Qib II (txoj kab ncaj nraim thiab lub kaum sab xis) yuav raug teev tseg rau cov khoom muaj kev ntxhov siab heev.
• Intergranular Corrosion Test: Txawm hais tias muaj kev ruaj khov heev, qee qhov kev qhia tshwj xeeb yuav xav tau IGC xeem (xws li ASTM G28 Txoj Kev A) ntawm cov qauv sensitized los ntawm tshav kub kom paub meej tias muaj kev tiv thaiv los nag lossis daus.
• Kev txheeb xyuas cov khoom zoo (PMI): Ntawm -XRF kev txheeb xyuas ntawm cov khoom siv hlau alloy yog cov qauv kev coj ua thaum tau txais thiab ua ntej tso tawm rau kev tsim khoom, kom tsis txhob muaj cov khoom sib tov- nce.
Kev Tshawb Fawb Kawg: Rau kev ua tiav cov khoom siv xws li cov hlab ntsha siab, Post-Cov kab kos kev kho cua sov (yog tias siv) thiab cov ntawv qhia kev sib txuas ntawm cov vuam, cov txheej txheem, thiab NDE cov lus ceeb toom rau qhov kawg ntawm cov khoom yog qhov tseem ceeb ntawm pob ntawv pov thawj zoo, kom ntseeg tau tias UNS N06002 phaj ua tau raws li tsim thoob plaws hauv nws lub neej kev pabcuam.
