Qib 5 Titanium hauv ASTM B338
ASTM B338 npog seamless thiab welded titanium raj rau condensers thiab tshav kub exchangers, thiab nws teev Qib 5 raws li ib tug pom zoo alloy. Qib 5, tsim los ntawm UNS R56400, muaj 5.5 txog 6.75 feem pua ntawm txhuas thiab 3.5 mus rau 4.5 feem pua vanadium, nrog rau qhov sib npaug titanium. Nws yog ib qho alpha{10}}beta alloy uas tsim kom muaj lub zog tensile yam tsawg kawg nkaus ntawm 895 MPa thiab qhov tsawg kawg nkaus yield zog ntawm 828 MPa nyob rau hauv annealed mob, kwv yees li 2.5 npaug ntawm lub zog ntawm Qib 2 ua lag luam ntshiab titanium.
Cov lus qhia tshwj xeeb tswj cov tshuaj lom neeg nruj, suav nrog cov pa oxygen txwv rau 0.20 feem pua, thiab yuav tsum tau kuaj xyuas txhua yam, hydrostatic lossis tsis yog - kev tshuaj xyuas kev puas tsuaj, thiab kev txheeb xyuas qhov ntev ntawm txhua qhov ntau. Tube yog muab nyob rau hauv diameters thiab phab ntsa thicknesses matched rau tshav kub exchanger tsim, nrog ncaj lengths feem ntau los ntawm 3 mus rau 12 meters thiab tolerances tau teev nyob rau hauv tus qauv.
Vim li cas thiaj xav tau lub siab -Lub raj muaj zog
Thaum tshav kub kub exchanger tsim yog tswj los ntawm lub siab, kub thiab cov neeg kho tshuab loads ntawm installation. Qib 5 tubing tso cai rau cov neeg tsim qauv siv phab ntsa nyias nyias rau kev tsim qauv siab dua li qib kev lag luam ntshiab, uas txhim kho cov cua sov thiab txo cov khoom hnyav. Nyob rau hauv siab - siab feedwater heaters thiab boiler economisers, qhov uas sab hauv siab tuaj yeem ncav cuag kaum bars, qhov siab dua tso cai ntawm Qib 5 txhais ua cov khoom sib txuas thiab cov nqi qis dua.
Kev qaug zog yog tus tsav tsheb thib ob. Thermal cycling ntawm kev khiav hauj lwm thiab kaw tej yam kev mob, ntxiv rau ntws -induced vibration, imposes alternating kev nyuaj siab ntawm lub raj. Lub siab qaug zog endurance ntawm Ti-6Al-4V muab cov neeg tsim qauv muaj kev nyab xeeb loj dua tiv thaiv kev co tsis ua haujlwm, uas yog vim li cas cov hlau tau teev nyob rau hauv kev xav tau cov kev pab cuam uas lub raj tsis ua hauj lwm ntxov ntxov yuav yuam kom kaw nqi kim.
Corrosion Cwj Pwm hauv Boiler thiab Cooling Service
Titanium tubes tiv thaiv kev xeb dav dav hauv boiler feedwater, condensate thiab kho cov dej txias, thiab oxide zaj duab xis tiv thaiv pitting hauv chloride-cov dej uas tawm tsam stainless hlau. Qib 5 khaws qhov kev tiv thaiv no nyob rau hauv feem ntau nruab nrab thiab oxidising ib puag ncig, txawm hais tias cov ntsiab lus alloy siab dua ua rau nws tsis muaj kev zam txim ntau dua li cov titanium ntshiab hauv qee qhov kub txo cov kua qaub, yog li dej chemistry tswj tseem tseem ceeb.
Hauv dej hiav txwv -cooled exchangers, titanium tubes tshem tawm cov corrosion thiab coatings xav tau los ntawm tooj liab-nickel lossis hlau. Kev yaig los ntawm cov khib nyiab pov tseg yog qhov tsawg vim tias qhov nyuaj, du oxide nto tiv taus qhov cuam tshuam. Cov txiaj ntsig tau zoo yog lub raj uas tsis tshua muaj kev cuam tshuam los ntawm corrosion, tso cai rau kev tsim lub neej ntawm kev sib hloov los ntawm cov neeg kho tshuab ntau dua li kev xav txog corrosion.
Fabrication thiab Installation Considerations
Qib 5 tube yog qhov tsim nyog tsawg dua li cov qib ntshiab hauv kev lag luam, yog li dov rau hauv cov ntawv raj thiab khoov yuav tsum tau hloov kho. Tube kawg dov siv mandrel tswj thiab ua tib zoo xaiv nthuav dav kom tsis txhob ua haujlwm hnyav tawg, thiab lub vojvoog nruj nruj yog tsim nrog cov khoom siv kos duab. Vuam rau raj -rau-tubesheet pob qij txha yog ua tiav nrog roj tungsten arc vuam nyob rau hauv inert gas, nrog muab tub lim hlau xaiv kom phim cov hlau.
Kev kho cua sov tom qab tsim feem ntau tsis tas yuav tsum tau ua, tab sis kev ua haujlwm txias txias ua raws li kev pabcuam hauv cov ntawv thov tseem ceeb tuaj yeem hu rau kev ntxhov siab. Lub raj yog tuav nrog cov uas tsis yog-cov hlua hlau thiab cov hnab looj tes huv si vim tias cov hlau tsis huv tuaj yeem ua rau muaj kev xeb hauv cheeb tsam ntawm qhov kub siab; pickling lossis tu tshem tawm cov hlau embedded ua ntej kev pabcuam.
Kev Tswj Xyuas Zoo thiab Ntawv Pov Thawj
Txhua qib ntawm qib 5 tube nqa cov ntaub ntawv pov thawj kev xeem ntawv lees paub txog chemistry, tensile zog, flattening thiab flaring kev ua tau zoo, thiab tsis yog - kev ntsuam xyuas kev puas tsuaj. Eddy tam sim no los yog ultrasonic kuaj xyuas tag nrho ntev rau qhov tsis xws luag, thiab kev kuaj hydrostatic txheeb xyuas qhov tseeb ntawm qhov xav tau. Cov ntaub ntawv taug kev cia tus exchanger fabricator taug qab txhua lub raj rau nws yaj, uas yog qhov tseem ceeb rau kev ua raws cai thiab kev tuav pov hwm cov cai.
Rau boilers thiab tshav kub exchangers tom qab ASME Tshooj VIII los yog zoo sib xws cov cai, lub raj tsim cov ntawv pov thawj raug tshuaj xyuas tiv thaiv tus tsim specification ua ntej installation. Qhov kev qhuab qhia ntawm kev tswj hwm no yog vim li cas titanium tubing ua tau zoo rau ntau xyoo hauv cov haujlwm sib pauv kub hnyav tshaj plaws.
Cov lus nug nquag
Q: Lub zog ntawm ASTM B338 Qib 5 titanium raj yog dab tsi?
A: Annealed Qib 5 raj muaj lub zog tensile yam tsawg kawg nkaus ntawm 895 MPa thiab qhov tsawg kawg nkaus yield zog ntawm 828 MPa, uas yog li 2.5 npaug ntawm lub zog ntawm Qib 2 titanium.
Q: Vim li cas thiaj siv Qib 5 es tsis txhob siv cov titanium ntshiab hauv cov khoom siv hluav taws xob?
A: Qhov kev ntxhov siab ntau dua tso cai rau cov phab ntsa nyias nyias rau tib lub siab, txhim kho cov cua sov thiab txo qhov hnyav, thaum qaug zog tiv thaiv kev co thiab thermal cycling tsis ua hauj lwm.
Q: Puas yog Qib 5 titanium raj tiv thaiv seawater corrosion?
A: Yog, cov yeeb yaj kiab oxide ruaj khov tiv taus pitting thiab yaig hauv dej hiav txwv thiab chloride -cov dej ntws, uas yog vim li cas cov alloy siv hauv marine cooling exchangers.
Q: Qib 5 puas tuaj yeem dov rau hauv cov ntawv raj?
A: Yog lawm, tab sis qhov kev nthuav dav dov yuav tsum tau tswj kom zoo vim tias cov hlau tsis muaj zog thiab tsis muaj zog dua li cov titanium ntshiab; tswj mandrel kom tsis txhob tawg.
Q: Puas yog tom qab-weld kho cua sov yuav tsum tau rau Qib 5 cov leeg pob qij txha?
A: Tsis yog ib txwm. Welds ua nrog cov muab tub lim zoo sib xws thiab tsim nyog inert gas shielding ua tau raws li cov qauv tsim yam tsis muaj kev tshaj tawm -weld heat treatment nyob rau hauv feem ntau cov kev pab cuam tshav kub exchanger.
