Stainless hlauyuav luag txhua zaus tus nqi ntau dua carbon steel thaum lub sijhawm yuav khoom - feem ntau ob mus rau plaub npaug ntau dua ib kilogram. Txiav txim tsuas yog ntawm tus lej ntawd, carbon steel zoo li kev xaiv nyiaj txiag. Tab sis tus nqi yuav khoom tsis yog tus nqi ntawm lub neej, thiab tshaj li 50- xyoo kev pabcuam lub qab ntug, cov txheej txheem, kev tshuaj xyuas, sijhawm poob, thiab kev hloov pauv nruab nrab ntawm lub neej uas carbon steel feem ntau xav tau tuaj yeem kaw qhov sib txawv kiag li lossis thim rov qab. Cov lus qhia no taug kev los ntawm cov txheej txheem kev ua neej nyob ntawm tus nqi sib piv ntawm stainless hlau piv rau carbon steel, qhia qhov twg txhua yam khoom yeej, los ntawm ntau npaum li cas, thiab nyob rau hauv cov xwm txheej dab tsi qhov crossover tshwm sim.
Dab tsi yog Kev Ntsuas Tus Nqi Them Lub Neej, thiab Vim Li Cas Nws Tseem Ceeb rau Kev Xaiv Khoom?
Lub neej voj voog kev txheeb xyuas tus nqi (LCCA) suav tag nrho txhua tus nqi ntawm cov khoom siv los ntawm nws lub neej kev pabcuam tag nrho - kev yuav khoom pib, kev teeb tsa, kev saib xyuas, kev tshuaj xyuas, sijhawm poob, thiab qhov hloov pauv lossis khaws cia tus nqi - es tsis yog tus nqi yuav khoom tom ntej, thiab nws tseem ceeb vim tias cov khoom txiav txim siab ua thawj tus nqi ib leeg ib txwm ua qis dua qhov tseeb 50-xyoo tus nqi pheej yig dua.
Daim ntawv xaj yuav ntes ib lub sijhawm hauv ib lub qauv lossis lub cev lub neej: hnub nws yuav. Txhua yam uas tshwm sim tom qab ntawd - rov ua dua lub corroding handrail, kaw cov txheej txheem kab los hloov cov yeeb nkab corroded, tshuaj xyuas lub tank rau seem poob - yog tus nqi tiag tiag uas tus nqi sib piv ua ntej - tsuas yog tshem tawm. Kev txheeb xyuas tus nqi ntawm lub neej raug kho rau qhov no los ntawm kev suav tag nrho cov nqi thoob plaws lub sijhawm txheeb xyuas, feem ntau txo qis rau tus nqi tam sim no kom cov nqi tshwm sim ntau xyoo yav tom ntej yog qhov hnyav rau cov nqi uas tshwm sim niaj hnub no.
Rau cov khoom xaiv nrog kev pab cuam lub neej ntsuas nyob rau hauv kaum xyoo - steel qauv, txheej txheem piping, cia tso tsheb hlau luam, sab nrauv lub tsev Cheebtsam - ib 50- xyoo qab ntug yog ib tug qauv, tiv thaiv lub sij hawm soj ntsuam, txij li thaum nws spans ntau yam txij nkawm mus thiab tsawg kawg yog ib tug plausible mid- txoj kev hloov lub neej.
Dab tsi yog qhov sib txawv ntawm Cov Hlau Stainless thiab Carbon Steel?
Stainless hlau feem ntau raug nqi kwv yees li ob mus rau plaub npaug ntau npaum li cov pa roj carbon steel ib kilogram ntawm kev yuav khoom thaum pib, nrog ntau yam nyob ntawm qib, kev ua lag luam alloy surcharges, thiab cov khoom tsim, thiab qhov sib txawv pem hauv ntej no yog tus lej loj tshaj plaws thiab pom ntau tshaj plaws nyob rau hauv ib qho kev sib piv - uas yog qhov tseeb vim li cas nws thiaj li dominates kev txiav txim siab yuav tsum nres ntawm thawj tus nqi.
Tus nqi hwm yog los ntawm cov ntsiab lus alloying: chromium, npib tsib xee, thiab molybdenum yog tag nrho cov nqi ntau dua rau kuv, ua kom zoo dua qub, thiab cov txheej txheem ntau dua li cov hlau thiab cov pa roj carbon uas ua rau cov pa roj carbon monoxide, thiab lawv cov nqi lag luam kuj tuaj yeem hloov pauv ntau dua, ntxiv cov nqi ntxiv uas hloov pauv nrog cov khoom lag luam thoob ntiaj teb. Cov qib austenitic Standard (304/304L, 316/316L) feem ntau nqa tus nqi qis dua li duplex lossis qib siab -nickel qib, yog li qib qib nws tus kheej yog ib qho tseem ceeb rau kev tswj tus nqi pem hauv ntej nyob rau hauv cov lus qhia stainless. Tus nqi no yog tiag tiag thiab yuav tsum tsis txhob raug tso tseg - lo lus nug ntawm lub neej kev txheeb xyuas cov lus teb tsis yog tias tus nqi muaj nyob, tab sis txawm tias nws yog tag nrho lossis ib nrab offset los ntawm cov nqi qis hauv txhua pawg, los ntawm kev teeb tsa los ntawm kev pov tseg.
Cov Nqi Them Nqi Them Nqi Them Li Cas Sib Piv Tshaj Li 50 Xyoo Kev Pabcuam?
Cov pa roj carbon steel nyob rau hauv feem ntau sab nraum zoov lossis corrosive ib puag ncig yuav tsum rov muaj kev tiv thaiv saum npoo - pleev xim, galvanizing kov-nce, los yog txheej txheej tshiab - feem ntau txhua txhua 8 mus rau 15 xyoo, thaum raug teev stainless hlau feem ntau yuav tsum tsis muaj corrosion-tsav deg tu txhua, ua kev tu nqi ib qho ntawm cov khoom loj tshaj plaws ntawm ob lub gaps.
Cov txheej txheem carbon hlau tsis ua tiav ib zaug; nws degrades maj mam los ntawm UV raug, puas, thiab tshuaj tua kab mob, yuav tsum tau soj ntsuam, kho qhov chaw, thiab nws thiaj li tag nrho recoating kom lub hauv paus hlau tiv thaiv. Nyob rau lub sijhawm 50- xyoo, qhov no feem ntau txhais tau tias peb mus rau tsib lub voj voog tag nrho lossis ib nrab ntawm cov txheej txheem rov ua dua tshiab, txhua qhov cuam tshuam nrog kev npaj nto (feem ntau tus nqi tsav tsheb loj tshaj plaws, tshwj xeeb tshaj yog rau cov hlau lead-paint abatement lossis nyuaj nkag), cov ntaub ntawv, thiab kev ua haujlwm - cov nqi rov ua dua txawm tias cov txheej txheem qub tau siv zoo npaum li cas.
Stainless hlau qhov kev tiv thaiv corrosion los ntawm tus kheej - kho cov txheej txheem oxide es tsis yog siv txheej txheej, yog li nyob rau hauv feem ntau cov kev pabcuam nws tsis nqa cov nqi rov ua dua tshiab txhua; nws cov kev saib xyuas xav tau hloov pauv mus rau kev siv tshuab thiab vuam- kev tshuaj xyuas kev ncaj ncees, uas feem ntau tsis tshua muaj nqi thiab tsis tshua muaj ntau dua li cov txheej txheem rov ua dua tshiab.
Yuav ua li cas Corrosion -Txog Lub Sijhawm Downtime thiab Hloov Cov Nqi Them Nqi?
Kev poob qis thiab nruab nrab -Lub neej hloov pauv feem ntau yog qhov loj tshaj plaws, tsawg tshaj plaws cov nqi kwv yees hauv qhov sib piv, vim tias qhov kev tsis txaus siab tshwm sim los ntawm corrosion tsis ua haujlwm tuaj yeem raug nqi ntau dua hauv kev lag luam ploj lossis kev pabcuam cuam tshuam ntau dua li cov khoom siv nws tus kheej - thiab qhov kev pheej hmoo no yog asymmetric, poob qis ntawm cov pa roj carbon steel hauv ib puag ncig hnyav.
Ib qho corroded carbon steel feem ntau tsis tshaj tawm nws qhov ua tsis tiav ua ntej; seem poob los mus txog rau thaum muaj qhov xau, cov qauv tsis muaj peev xwm, lossis kev tshuaj xyuas nrhiav yuam kev kho lossis hloov tsis tau. Nyob rau hauv cov txheej txheem kev lag luam, tus nqi ntawm qhov hluav taws xob nws tus kheej - poob ntau lawm, tus nqi ua haujlwm kub ntxhov, cov khoom siv nrawm nrawm - feem ntau tshaj cov khoom siv ncaj qha thiab tus nqi ntawm kev txhim kho los ntawm qhov dav dav.
Qhov no yog qeb uas qhov kev sib piv ntawm lub neej sib txawv ntawm qhov sib piv ntawm cov khoom siv yooj yim: stainless hlau tus nqi siab dua yuav zoo yuav qis dua qhov tshwm sim ntawm qhov kim, cuam tshuam, thiab hauv cov ntawv thov uas tsis tau npaj tseg downtime yog kim heev - cov txheej txheem txuas ntxiv cov nroj tsuag, cov txheej txheem tseem ceeb - uas yuav txo qis ib leeg tuaj yeem ua pov thawj rau cov nqi qis dua ua ntej.
Tus nqi tag nrho ntawm cov tswv yog dab tsi: Stainless Steel vs Carbon Steel Tshaj 50 Xyoo?
Thaum txhua tus nqi qeb - tus nqi pib, txheej, tshuaj xyuas, qhov tshwm sim - qhov hnyav hloov pauv, thiab qhov kawg- ntawm - lub neej seem tus nqi - yog summed tshaj 50- xyoo, stainless hlau feem ntau ua tiav qis dua lossis sib piv tag nrho tus nqi ntawm cov tswv cuab txheeb ze rau coated carbon steel} ib puag ncig, txawm tias tus nqi pib-{7} tseem muaj ntau dua thoob plaws.
Cov lus hauv qab no qhia txog txhua tus nqi qeb ib sab ntawm ib sab:
|
Qeb Nqi |
Carbon Steel (coated / pleev xim rau) |
Stainless hlau |
Kev taw qhia ntawm qhov zoo |
|
Cov khoom siv pib nqi |
Tsawg ib kilogram thiab feem ntau ib chav tsev ntim |
Feem ntau 2–4x carbon steel ib kilogram, qib- nyob ntawm |
Cov pa roj carbon steel |
|
Kev tiv thaiv nto (txheej / pleev xim) |
Yuav tsum tau; Tus nqi rov ua dua txhua 5-15 xyoo nyob ntawm qhov raug |
Feem ntau tsis tas yuav tsum muaj kev tiv thaiv corrosion |
Stainless hlau |
|
Kev soj ntsuam tas li |
Txheej xwm txheej, corrosion, thiab seem - poob checks |
Feem ntau txhua yam / weld kev kuaj xyuas; corrosion checks sib zog nyob rau hauv feem ntau ib puag ncig |
Stainless hlau |
|
Unplanned downtime txaus ntshai |
Siab dua nyob rau hauv corrosive los yog humid ib puag ncig raws li coatings degrade |
Tsawg nyob rau hauv feem ntau ib puag ncig; siab dua ua ntej- tus nqi yuav txo kev pheej hmoo |
Stainless hlau |
|
Nruab nrab - yuav hloov lub neej (hauv 50 xyoo) |
Muaj peev xwm yuav nyob rau hauv ib puag ncig txhoj puab heev yog tias seem poob tseem ceeb |
Tsawg nyob rau hauv ib puag ncig kom raug |
Stainless hlau |
|
Xaus - ntawm - lub neej seem nqi |
Tam sim no tab sis qis dua ib kilogram dua stainless seem |
Lub ntsiab lus siab dua ib kilogram vim cov ntsiab lus alloy |
Stainless hlau |
Table 1. Lub neej voj voog cov nqi sib piv, stainless hlau vs. coated carbon steel, dhau 50-xyoo kev tshuaj xyuas.
Ib qho piv txwv ntawm 50-xyoo tus nqi roll-up, indexed rau thawj cov khoom siv carbon steel nqi raws li lub hauv paus ntawm 100 units, qhia tau hais tias cov pawg no ua ke li cas:
|
Cov Khoom Siv Tus Nqi (pib qhia, ntsuas rau 100 units ntawm thawj cov khoom siv carbon steel nqi) |
Carbon hlau (coated) |
Stainless hlau |
|
Initial khoom thiab fabrication nqi |
100 units |
≈ 220–320 units |
|
Recoating / tiv thaiv nto (kwv yees txhua 8-12 xyoo, 4 lub voj voog tshaj 50 xyoo) |
≈ 25–40 units ib lub voj voog → ≈ 100–160 units cumulative |
≈ 0 (tsis tas yuav tsum muaj nyob rau hauv ntau qhov chaw pabcuam) |
|
Kev tshuaj xyuas niaj hnub tshaj 50 xyoo |
≈ 30-50 units cumulative |
≈ 15-25 units cumulative |
|
Qhov yuav tshwm sim - hnyav nruab nrab - hloov lub neej |
Lub ntsiab lus nyob rau hauv ib puag ncig nruj; tuaj yeem ntxiv 50–150+ units |
Tsawg nyob rau hauv ib puag ncig kom raug; feem ntau tsawg heev |
|
Xaus - ntawm - lub neej seem credit |
≈ -10 txog -15 units (credit, piv txwv li, txo nqi) |
≈ -30 txog -50 units (credit, piv txwv li, txo nqi) |
|
Kev piav qhia 50-xyoo tag nrho (cov txheeb ze) |
≈ 250–370+ units, ib puag ncig-dependent |
≈ 210–300 units, ib puag ncig- nyob ntawm |
Table 2. Daim duab 50- xyoo indexed nqi sib piv. Cov duab yog cov kev taw qhia kwv yees rau qhov nruab nrab-rau- ib puag ncig corrosive hnyav, npaj los piav qhia cov duab ntawm qhov sib piv es tsis yog ua haujlwm raws li qhov project-kev kwv yees tshwj xeeb; Cov ntaub ntawv tiag tiag sib txawv ntawm ib puag ncig, xaiv qib, kev ua lag luam ua haujlwm, thiab qhov project nplai, thiab yuav tsum tau tsim nrog LCCA qhov project tshwj xeeb.
Ib puag ncig thiab daim ntawv thov hnyav li cas hloov qhov Crossover Point?
Qhov chaw ib puag ncig yog qhov sib txawv loj tshaj plaws nyob rau hauv seb stainless hlau lub neej voj voog cov nqi siv tau zoo li cas: nyob rau hauv me me, qhuav, zoo -tswj ib puag ncig lub crossover yuav tsis tshwm sim nyob rau hauv 50 xyoo, thaum nyob rau hauv marine, tshuaj- txheej txheem, siab - av noo, los yog deicing- ntsev ib puag ncig lub crossover yuav tshwm sim ua ntej 50 xyoo.
Cov pa roj carbon steel kev saib xyuas thiab hloov cov nqi tau tsav yuav luag tag nrho los ntawm tus nqi corrosion, uas sib txawv loj heev nrog ib puag ncig - qhuav, huab cua-tswj cov ntawv thov sab hauv yuav pom cov nqi qis txaus uas ib txheej txheej txheej kav ntev ntau xyoo nrog qhov tsawg kawg nkaus kov- nce, thaum lub ntug dej hiav txwv, tshuaj lom neeg, lossis deicing{3} daim ntawv thov tsis ua tiav{3}; nyob rau hauv ob peb xyoos yam tsis muaj kev saib xyuas nruj heev.
Qhov no yog vim li cas qhov kev sib piv nqi ntawm lub neej tsis yog ib lo lus teb thoob ntiaj teb; nws yog ib puag ncig- tshwj xeeb thiab daim ntawv thov- tshwj xeeb suav. Cov cuab yeej siv rau kev ntsuas qhov hnyav muaj xws li cov huab cua raug mob (nyob deb nroog, nroog, kev lag luam, marine), tshuaj lom neeg (pH, chloride cov ntsiab lus, qhov kub thiab txias), thiab lub voj voog ua haujlwm (nruam ntub dej tsis tu ncua piv rau qhov sib cuam tshuam) - tag nrho cov kev hloov pauv ntau zaus ntawm cov pa roj carbon steel txij nkawm thiab qhov tsis muaj peev xwm hloov tsis tau.
Yuav Xaus li cas - ntawm - Lub Neej Tus Nqi cuam tshuam tag nrho cov nqi?
Stainless hlau tus nqi siab dua ntawm qhov kawg ntawm lub neej muab tus nqi ntau dua li cov pa roj carbon steel cov nqi seem, txo qis tus nqi ntawm lub neej kev sib txawv ntxiv, vim tias cov khoom seem stainless khaws cov nqi ntawm nws cov chromium thiab nickel cov ntsiab lus nyob rau hauv ib txoj kev uas cov pa roj carbon steel seem tsis yog.
Ob qho khoom siv rov ua dua tshiab thiab ob qho tib si nqa cov txiaj ntsig zoo, tab sis cov khoom siv hlau tsis muaj zog hais kom tus nqi siab dua ib kilogram vim tias remelters muaj nuj nqis rau cov ntsiab lus ntawm cov khoom siv rov qab, qhov seem carbon steel seem nqi qhia feem ntau nws cov ntsiab lus hlau. Tshaj li 50-xyoo lub qab ntug no kawg- ntawm-lub neej credit yog ib qho me me ntawm tag nrho cov nqi duab piv nrog kev saib xyuas thiab kev poob qis, tab sis nws yog qhov tseeb, kev taw qhia zoo ib yam uas nyiam cov hlau tsis muaj steel thiab yuav tsum tau suav nrog hauv lub neej voj voog tus qauv nqi tag nrho es tsis tso tseg rau kev yooj yim.
Thaum twg Carbon Steel tseem muaj kev xaiv nyiaj txiag ntau dua?
Cov pa roj carbon steel tseem yog qhov kev xaiv ntawm lub neej kev lag luam ntau dua rau kev tsim lub neej luv luv, me me lossis zoo -tswj ib puag ncig, cov ntawv thov uas tau teem sijhawm hloov pauv twb tau npaj rau cov laj thawj uas tsis yog kev xeb, thiab cov xwm txheej uas muaj zog, zoo-txheej txheej txheej lossis galvanizing qhov kev pabcuam yog qhov muaj txiaj ntsig zoo rau lub sijhawm ua haujlwm puv ntoob.
Lub neej voj voog ntawm cov hlau tsis muaj zog yog qhov muaj zog tshaj qhov uas muaj kev pheej hmoo corrosion, tus nqi poob qis, lossis kev saib xyuas kev nyuaj siab yog siab - nws tsis yog qhov kev pom zoo thoob ntiaj teb kom qhia meej stainless hlau txhua qhov chaw. Cov ntawv thov nrog lub neej tsim luv luv (cov qauv ib ntus, cov cuab yeej siv nrog kev npaj thev naus laus zis- hloov pauv tau zoo ua ntej corrosion yuav txwv), benign sab hauv tsev lossis huab cua-tswj ib puag ncig, thiab cov xwm txheej uas kev saib xyuas thiab peev nyiaj rau cov txheej txheem txheej txheem yog ob qho tib si muaj kev ntseeg siab nyob rau hauv tag nrho cov kev pab cuam lub neej yog tag nrho cov xwm txheej uas carbon steel tus nqi qis dua tus nqi tag nrho yog 4 xyoo kev txiav txim siab ntau dua li 5 xyoo dhau los; qab ntug. Lub hom phiaj ntawm lub voj voog lub neej tsis yog tshaj tawm ib qho khoom siv thoob ntiaj teb zoo tshaj plaws, tab sis ua kom qhov kev sib piv qhia meej txaus tias qhov kev txiav txim siab yog raws li tag nrho cov nqi thiab kev pheej hmoo ntau dua li tus nqi yuav khoom ib leeg.
Cov lus nug ceev ceev rau kev xaiv cov khoom siv
- Dab tsi yog qhov tseeb corrosion hnyav ntawm kev pabcuam ib puag ncig, thiab kev ntseeg siab npaum li cas?
- Dab tsi yog qhov kev txiav txim siab tsis tau npaj los yog ua tsis tiav yog raug nqi dab tsi hauv daim ntawv thov no - kev kho ncaj qha nkaus xwb, lossis poob kev tsim khoom thiab muaj kev nyab xeeb zoo li?
- Puas muaj kev ntseeg siab, kev npaj nyiaj txiag los tswj cov txheej txheem txheej txheem rau lub sijhawm tshuaj xyuas tag nrho, suav nrog kev nkag mus rau rov ua dua?
- Dab tsi yog qhov tsim nyog tsim lub neej, thiab nws puas dhau qhov taw tes ntawm cov pa roj carbon steel txheej lossis cov khoom siv yuav xav tau kev cuam tshuam loj?
Cov lus nug nquag
Puas yog stainless hlau ib txwm pheej yig dua carbon steel tshaj 50 xyoo?
Tsis yog. Lub neej voj voog zoo nyob ntawm ib puag ncig thiab kev siv; nyob rau hauv me me, zoo- tswj ib puag ncig nrog cov txheej txheem kev saib xyuas kom ruaj khov, cov pa roj carbon steel tuaj yeem nyob qis dua - kev xaiv tus nqi txawm tias dhau 50 xyoo.
Kev txheeb xyuas tus nqi ntawm lub neej txawv li cas los ntawm kev suav nyiaj rov qab yooj yim?
Kev xam nyiaj rov qab feem ntau yog sib piv ob txoj kev xaiv thiab pom cov ntsiab lus uas cov nqi sib tw hla dhau, thaum tag nrho LCCA tseem suav rau lub sijhawm tus nqi ntawm cov nyiaj (tso luv nqi yav tom ntej rau tus nqi tam sim no) thiab qhov tshwm sim - hnyav qhov kev pheej hmoo ntawm cov xwm txheej zoo li tsis tau npaj tseg, muab lub hauv paus zoo dua thiab tiv thaiv kev sib piv.
Puas yog galvanizing kaw tus nqi sib txawv ntawm carbon steel thiab stainless hlau?
Galvanizing txuas ntxiv cov pa roj carbon steel kev txij nkawm- ncua sijhawm pub dawb piv nrog cov xim ib leeg thiab ua rau qhov sib txawv hauv ntau qhov chaw, tab sis nws tsis sib npaug rau cov hlau tsis zoo hauv cov tshuaj lom neeg lossis siab -chloride ib puag ncig, qhov twg zinc txheej nws tus kheej tuaj yeem noj tau sai, yog li qhov kev sib piv tseem yuav tsum tau khiav ib puag ncig- dua li assumed.
Tus nqi luv nqi dab tsi yuav tsum tau siv hauv stainless vs. carbon steel LCCA?
Tsis muaj daim duab universal; tus nqi luv nqi yuav tsum muaj kev cuam tshuam tus tswv tus nqi tiag tiag ntawm cov peev lossis tus nqi uas tau teev tseg los ntawm cov khoom siv pej xeem cuam tshuam lossis kev qhia txog kev lag luam kev lag luam, thiab cov khoom lag luam zaum kawg yuav tsum tau txheeb xyuas qhov kev nkag siab ntawm qhov tsim nyog ntawm cov nqi luv nqi es tsis yog cia siab rau ib qho kev xav tau.
Puas yog 50-xyoo kev sib piv hloov rau cov nickel alloys piv rau cov qib stainless hlau?
Yog - npib tsib xee alloys nqa tus nqi pib nqi ntau dua li cov qauv austenitic stainless qib, yog li lawv lub neej voj voog yog nyob ntawm ib puag ncig kev pabcuam hnyav dua (siab- kub, siab corrosive, lossis siab - chloride tej yam kev mob)) kom pom tseeb tias tus nqi ntxiv los ntawm kev zam kev ua tsis tiav thiab kev poob qis.
