Hauv qhov siab -stakes ib puag ncig ntawm seawater desalination, kev ncaj ncees ntawm kev noj haus yog qhov tseem ceeb. Lub seawater intake valve ua raws li thawj kab ntawm kev tiv thaiv, tswj cov ntws ntawm cov dej hiav txwv nyoos rau hauv cov txheej txheem kho. Tau ntau xyoo lawm, AISI 316/316L stainless hlau (316SS) yog tus mus- rau cov khoom siv rau cov khoom tseem ceeb no. Txawm li cas los xij, raws li cov nroj tsuag desalination thawb kom muaj txiaj ntsig zoo dua, kev saib xyuas ntev dua, thiab kev ua haujlwm hauv thaj chaw marine ntau dua, 316SS tau nthuav qhia nws cov kev txwv.
Niaj hnub no, Duplex Stainless Steel 2205 (UNS S32205 / S31803) tau dhau los ua tus qauv kev lag luam rau cov dej hiav txwv kom tsawg, hloov 316SS hauv cov ntawv thov tseem ceeb. Tab sis vim li cas qhov kev hloov? Kab lus no dhia mus rau hauv metallurgical thiab kev ua haujlwm vim li cas tom qab qhov kev hloov pauv no.
1. Kev sib tw Corrosion: Pitting thiabCrevice Corrosion
Dej hiav txwv yog qhov nruab nrab corrosive heev, nplua nuj nyob rau hauv chlorides. Lub hom phiaj tseem ceeb tsis ua haujlwm rau stainless hlau li qub hauv qhov chaw no yog pitting corrosion thiab crevice corrosion. Cov hom kev tawm tsam hauv cheeb tsam no tuaj yeem ua rau muaj kev puas tsuaj loj heev thiab tsis tau npaj kaw.
Qhov tsis kam ntawm cov hlau tsis muaj steel rau cov ntaub ntawv ntawm corrosion yog feem ntau suav los ntawm nws cov Pitting Resistance Equivalent Number (PREN). Cov qauv siv feem ntau yog:
PREN=%Cr+3.3×(%Mo+0.5×%W)+16×%N
AISI 316L: Feem ntau muaj ~ 17% Cr, ~ 2.5% Mo, thiab negligible Nitrogen. Nws tus nqi PREN hovers nyob ib ncig ntawm 24-25.
Duplex 2205: Muaj ~ 22% Cr, ~ 3% Mo, thiab tseem ceeb ~ 0.17% Nitrogen. Nws tus nqi PREN feem ntau yog ntau dua lossis sib npaug rau 34-35.
Qhov tshwm sim: Duplex 2205 muaj kwv yees li 40-50% siab dua rau pitting thiab crevice corrosion piv rau 316SS. Nyob rau hauv seawater intake kab, qhov twg stagnant aav (crevices) muaj nyob ib ncig ntawm lub rooj zaum valve, stems, thiab flange sib txuas, qhov sib txawv no tsis yog ib tug xov tooj xwb; nws yog qhov txawv ntawm 2-xyoo lifespan thiab ib 20+ xyoo lifespan.
2. Mechanical Strength: Doubling down on Durability
Desalination kom tsawg li qub feem ntau ua haujlwm nyob rau hauv siab thiab yuav tsum tiv thaiv hydraulic shocks (dej rauj).
Yield Strength: 316SS muaj lub zog tawm los ntawm ~ 205-290 MPa. Duplex 2205 boasts lub zog tawm los ntawm Ntau dua lossis sib npaug rau 450 MPa-ntau tshaj ob npaug ntawm 316SS.
Tensile Strength: 2205 ua tiav tensile zog ntawm ~ 620-800 MPa, piv rau ~ 500-620 MPa rau 316SS.
Kev cuam tshuam kev ua haujlwm: Lub zog zoo tshaj no tso cai rau cov kws ua haujlwm tsim cov li qub nrog cov phab ntsa nyias nyias yam tsis muaj kev cuam tshuam kev nyab xeeb, uas tuaj yeem txo qhov hnyav. Qhov tseem ceeb tshaj, nws muab qhov kev nyab xeeb loj heev tiv thaiv kev hloov pauv ntawm cov tshuab, yaig- corrosion, thiab siab -siab surges tshwm sim nyob rau hauv loj -scale intake manifolds.
3. Stress Corrosion Cracking (SCC) Resistance
Ib qho ntawm cov neeg tua neeg uas ntsiag to ntawm austenitic stainless hlau (xws li 316SS) hauv dej hiav txwv sov yog Chloride Stress Corrosion Cracking (Cl-SCC). Thaum cov kab nrib pleb pib, lawv propagate sai, feem ntau ua rau tsis ua hauj lwm tam sim ntawd.
Duplex 2205's tshwj xeeb microstructure- kwv yees li 50/50 sib xyaw ntawm austenite thiab ferrite- ua rau nws muaj peev xwm tiv taus SCC. Cov theem ferritic cuam tshuam txoj kev tawg ntawm kev nthuav dav uas yooj yim hla cov qauv austenitic ntshiab ntawm 316SS. Rau cov nroj tsuag desalination ua haujlwm hauv huab cua sov zoo li Middle East qhov twg dej hiav txwv kub tuaj yeem tshaj 30 degree, 2205 tsis yog kev hloov kho xwb; nws yog qhov tsim nyog.
4. Tag Nrho Cov Tswv Cuab (TCO)
Thaum tus nqi pib raw khoom ntawm Duplex 2205 yog siab dua 316SS, Tus Nqi Tag Nrho Cov Tswv Cuab qhia ib zaj dab neeg sib txawv.
Txo Kev Kho Mob: 2205 li qub yuav tsum tau kuaj xyuas thiab hloov tsis tu ncua.
Extended Service Life: Cov cuab yeej siv tau ntev dua 2-3 zaug.
Kev Tiv Thaiv Lub Sij Hawm: Tsis tau npaj kaw ntawm cov nroj tsuag desalination vim valve tsis ua haujlwm tuaj yeem raug nqi ntau pua txhiab nyiaj hauv ib hnub. Kev ntseeg tau ntawm 2205 txo qhov kev pheej hmoo no.
Thaum xam dhau 20-xyoo lub neej txoj haujlwm, 2205 feem ntau ua pov thawj tias yog qhov kev xaiv pheej yig dua.
Xaus: Tus Qauv Tshiab rau Kev Tswj Flow
Kev hloov pauv ntawm 316SS mus rau Duplex 2205 hauv cov ntawv thov dej hiav txwv tau tsav los ntawm cov ntaub ntawv, kev ua haujlwm hauv cheeb tsam, thiab qhov kev thov tsis tu ncua rau kev ntseeg tau. Rau cov lus qhia tshwj xeeb hauv cov phiaj xwm desalination tshiab lossis rov kho cov uas twb muaj lawm, Duplex 2205 muab qhov zoo tshaj plaws ntawm kev tiv thaiv corrosion, txhua yam muaj zog, thiab cov nqi ntawm lub neej.
NSV VALVE tshwj xeeb hauv siab -kev ua haujlwm li qub. Peb ntau yam ntawm Duplex 2205 Rooj vag, Lub Ntiaj Teb, Kos, thiab Npauj Npaim Li qub yog tsim tshwj xeeb rau qhov tseeb hnyav ntawm desalination thiab marine ib puag ncig. Hu rau peb pab pawg kws tshaj lij hnub no los tham txog yuav ua li cas kho dua tshiab rau 2205 tuaj yeem ruaj ntseg koj cov nroj tsuag kev ua haujlwm yav tom ntej.
