Super Duplex S32750, tseem hu ua 2507 lossis UNS S32750, yog lub siab -kev ua haujlwm stainless hlau phaj uas sib txuas cov khoom zoo tshaj plaws ntawm ob qho tib si austenitic thiab ferritic stainless hlau. Nrog rau tus nqi PREN ntawm ntau dua lossis sib npaug rau 40, cov khoom siv no muaj lub zog tshwj xeeb, kwv yees li ob zaug ntawm 316L stainless hlau, thaum tswj tau zoo heev rau pitting, crevice corrosion, thiab chloride-induced stress corrosion cracking.
Nws dual -theem microstructure ntawm kwv yees li 50% austenite thiab 50% ferrite ua rau nws ua tau zoo nyob rau hauv qhov chaw ua haujlwm hnyav tshaj plaws. Kab lus no tshawb txog cov ntawv thov kev lag luam tseem ceeb ntawm S32750 daim hlau.
Offshore Roj thiab Roj Platforms thiab Subsea Equipment
Offshore roj thiab roj rho tawm yog ib qho kev xav tau tshaj plaws rau cov khoom siv hlau. S32750 daim hlau yog dav siv nyob rau hauv offshore platforms, subsea pipelines, jumper pipes, thiab umbilical termination systems vim lawv zoo heev tiv thaiv seawater corrosion thiab siab mechanical zog.
Cov khoom siv siab chromium (24-26%) thiab molybdenum (3-5%) cov ntsiab lus muab kev tiv thaiv zoo heev rau pitting thiab crevice corrosion nyob rau hauv ib puag ncig uas muaj chloride nplua nuj, uas yog ib qho tseem ceeb rau cov khoom siv tas li raug dej hiav txwv thiab tsim cov kua dej uas muaj chlorides.
Tsis tas li ntawd, S32750 tau teev nyob rau hauv NACE MR0175 rau kev pabcuam qaub, txhais tau hais tias nws tuaj yeem ua rau muaj kev nyab xeeb ntawm hydrogen sulfide (H₂S)- muaj ib puag ncig uas muaj roj thiab roj ntau lawm.
Lub phaj lub zog muaj zog (Ntau dua lossis sib npaug ntawm 550 MPa) tso cai rau cov kws ua haujlwm tsim cov qauv sib dua thiab sib zog dua yam tsis muaj kev cuam tshuam kev nyab xeeb, txo tag nrho lub platform hnyav thiab cov nqi. Cov ntawv thov ib txwm muaj xws li hluav taws kub- kev sib ntaus sib tua, kev txhaj tshuaj thiab cov dej ballast, subsea manifolds, thiab cov khoom siv hauv cov txheej txheem drilling.
Cov Khoom Siv Hluav Taws Xob thiab Cov Khoom Siv Hluav Taws Xob
Cov nroj tsuag ua cov tshuaj tua kab mob hnyav, alkalis, thiab lwm yam corrosive media uas sai sai degrade zoo tib yam stainless hlau. S32750 daim hlau tau txais kev pom zoo ASME rau kev siv cov hlab ntsha siab, ua rau lawv muaj kev ntseeg siab rau cov reactors, cov kab distillation, absorbers, thiab cov tso tsheb hlau luam hauv kev lag luam tshuaj.
Cov alloy qhia tau zoo heev tiv thaiv ntau yam tshuaj, suav nrog sulfuric acid, hydrochloric acid, nitric acid, thiab organic acids. Hauv kev tsim cov polypropylene, PVC, thiab caustic evaporators, S32750 daim hlau tiv thaiv ob qho tib si tshuaj tua kab mob thiab cov neeg kho tshuab kev ntxhov siab ntawm kev ua haujlwm siab -.
Cov khoom siv PREN tus nqi siab tshaj 41 kom ntseeg tau tias kev ua tau zoo nyob rau hauv ib puag ncig uas pitting thiab crevice corrosion yog qhov kev hem thawj tas li. Tsis tas li ntawd, cov ntsiab lus carbon tsawg txo qhov kev pheej hmoo ntawm intergranular corrosion tom qab vuam, uas yog qhov tseem ceeb rau kev tsim cov hlab ntsha loj thiab cov tshuaj reactors.
Seawater Desalination Nroj Tsuag
Kev tsim cov dej tshiab los ntawm seawater desalination qhov chaw xav tau heev ntawm cov khoom siv. Cov ntsev ntsev ntau, qhov kub thiab txias, thiab muaj cov chlorides tsim ib qho chaw corrosive heev uas tawm tsam cov pa hlau tsis zoo. S32750 daim hlau tau tshwm sim los ua cov khoom ntawm kev xaiv rau qhov tseem ceeb desalination Cheebtsam, xws li evaporators, condensers, tshav kub exchangers, thiab piping systems.
Kev tshawb fawb tau pom tias S32750 nthuav tawm kev tiv thaiv corrosion zoo dua piv rau cov qauv duplex qib zoo li S32205 hauv seawater desalination kev pabcuam, nrog tsawg dua pitting kab nyob rau hauv cov xwm txheej raug zoo tib yam. Lub alloy qhov tseem ceeb pitting kub (CPT) tshaj 40℃hauv 20% NaCl tov, deb tshaj qhov kev ua tau zoo ntawm 316L stainless hlau. Cov khoom siv kuj tau siv dav hauv cov da dej txias, lub tshuab cua sov, thiab lwm yam dej hiav txwv -cov khoom siv.
Pulp thiab Paper Manufacturing
Kev lag luam pulp thiab ntawv muaj ntau theem uas cov khoom siv raug rau cov tshuaj hnyav thiab kub kub. Thaum lub sij hawm cov txheej txheem pulping, muaj zog alkaline daws zom cov ntoo fibers; Hauv kev ua haujlwm bleaching, chlorine dioxide thiab lwm cov tshuaj oxidizing yog siv. S32750 daim hlau ua tau zoo nyob rau hauv ob qho tib si ib puag ncig.
Nyob rau hauv cov ntaub so ntswg thiab ntawv bleaching systems, S32750 daim hlau tiv thaiv cov corrosive los ntawm cov tshuaj bleaching, thaum lawv lub zog siab tuav lub mechanical stresses ntawm tsiv pulp thiab ntawv cov khoom nyob rau hauv lub chaw tsim khoom. Cov khoom siv kuj tseem siv rau hauv cov digesters, cov hlab ntsha siab, thiab cov kav dej thoob plaws hauv cov kab ntau lawm.
Qhov zoo tshaj pitting thiab crevice corrosion kuj ntawm S32750, muab los ntawm nws cov chromium siab, molybdenum, thiab nitrogen cov ntsiab lus, ua kom ntseeg tau ntev - lub sijhawm ua haujlwm txawm tias nyob rau hauv qhov hnyav tshaj plaws ntawm cov tshuaj bleach cog.
Flue Gas Desulfurization (FGD) Systems
Cov chaw tsim hluav taws xob thiab cov chaw tsim khoom lag luam yuav tsum tshem tawm sulfur dioxide (SO₂) los ntawm cov pa hluav taws xob kom ua tau raws li cov cai ntawm ib puag ncig. Flue gas desulfurization (FGD) cov tshuab siv cov tshuab ntxhua khaub ncaws uas ua rau kub, chloride-muaj cov slurries- cov xwm txheej uas tsis tshua muaj corrosive rau feem ntau cov hlau. S32750 daim hlau yog qhov tsim nyog rau FGD ducting, absorber yees, thiab cov kav dej sib txuas.
The FGD environment is particularly challenging because it combines chlorides, acids, and elevated temperatures. S32750's high pitting resistance equivalent number (>40) muab qhov tshwj xeeb tsis kam rau pitting thiab crevice corrosion nyob rau hauv cov mob hnyav, ua tau zoo tshaj tus qauv stainless hlau. Cov ntaub ntawv muaj peev xwm los tswj cov tshuaj chloride ntau tshaj 40,000 ppm ntawm qhov kub txog li 60℃ua rau nws muaj kev ntseeg siab rau FGD daim ntawv thov uas cov khoom tsis ua hauj lwm tuaj yeem ua rau cov nroj tsuag raug nqi thiab kev ua txhaum ntawm ib puag ncig.
Kub Exchangers thiab Condenser
Thaum tshav kub kub exchangers thiab condensers yog cov khoom tseem ceeb nyob rau hauv yuav luag tag nrho cov txheej txheem kev lag luam, los ntawm petrochemical refineries mus rau lub hwj chim. Cov Cheebtsam no yuav tsum muaj kev tiv thaiv kev kub ntxhov, qhov kub thiab txias, thiab cov txheej txheem corrosive. S32750 daim hlau yog dav siv hauv plhaub - thiab - raj kub exchangers, phaj kub exchangers, thiab condensers vim lawv ua ke ntawm siab zog thiab superior corrosion kuj.
Cov khoom siv thermal conductivity yog siab dua li ntawm austenitic stainless hlau, txhim kho kev hloov hluav taws xob. Nws lub zog tawm los ntawm 550 MPa yam tsawg kawg nkaus tso cai rau cov neeg tsim qauv siv cov phaj nyias thiab cov raj ntau dua li qhov xav tau nrog cov qib stainless hlau, txo cov khoom hnyav thiab tus nqi yam tsis muaj kev cuam tshuam kev ua haujlwm.
S32750 daim hlau tuav cov khoom zoo heev txog li 300 degree, ua rau lawv haum rau ntau hom kev sib pauv cua sov. Tsis tas li ntawd, cov khoom siv weldability zoo ua kom ntseeg tau tias cov khoom siv hluav taws xob sib txawv tuaj yeem tsim kev ntseeg siab kom tau raws li ASME thiab lwm cov lej thoob ntiaj teb.
Marine Engineering thiab Shipbuilding
Marine ib puag ncig yog inherently corrosive, nrog seawater, ntsev tsuag, thiab marine kab mob lossi tawm tsam cov hlab ntsha thiab cov khoom siv. S32750 daim hlau tau lees paub tias yog cov khoom siv zoo tshaj plaws rau kev siv dej hiav txwv, suav nrog lub nkoj hulls, seawater txias tshuab, kiv cua shafts, thiab lwm yam khoom uas yuav tsum tau muaj zog thiab corrosion kuj.
Cov hlau alloy tau raug xaiv rau cov qauv qauv ntawm cov nkoj soj ntsuam kev tsim kho tshiab uas lub hom phiaj tsim kom muaj txiaj ntsig zoo, muaj zog dua, thiab kev saib xyuas - nkoj dawb. Hauv kev pabcuam marine, S32750 muaj ntau qhov zoo sib xws. Nws lub zog siab - rau - qhov hnyav piv ua rau lub nkoj sib dua. Nws zoo heev tsis kam rau pitting thiab crevice corrosion tshem tawm qhov xav tau kev tiv thaiv txheej hauv ntau daim ntawv thov.
Thiab nws tsis kam mus rau biofouling thiab marine kev loj hlob txo qis thiab txhim kho roj efficiency tshaj lub nkoj txoj kev pab cuam lub neej. Rau cov nkoj txhawb nqa sab ntug dej hiav txwv, hluav taws- nkoj sib ntaus sib tua, thiab lwm yam khoom siv hauv hiav txwv tshwj xeeb, S32750 daim hlau xa cov kev ntseeg siab thiab lub neej ntev uas xav tau rau kev xav tau dej hiav txwv - mus rau kev pabcuam.
Petrochemical Refining Facilities
Petrochemical refineries txheej txheem cov roj crude rau hauv roj, lubricants, thiab tshuaj feedstocks. Thoob plaws hauv cov txheej txheem refining, cov cuab yeej los rau hauv kev sib cuag nrog hydrogen sulfide, chlorides, naphthenic acids, thiab lwm yam corrosive hom ntawm qhov kub thiab txias. S32750 daim hlau yog siv dav hauv cov khoom siv refinery, nrog rau atmospheric thiab lub tshuab nqus tsev distillation kab, hydrocracker Cheebtsam, thiab cov kav dej tuav corrosive intermediate ntws.
Cov ntaub ntawv NACE MR0175 daim ntawv pov thawj rau kev pabcuam qaub tau lees paub tias nws tsim nyog rau ib puag ncig uas muaj hydrogen sulfide, ib qho kev txhawj xeeb hauv kev ua cov roj crude. Nws muaj kev tiv thaiv siab rau chloride kev nyuaj siab corrosion cracking - ib qho kev tsis ua hauj lwm tsis tu ncua hauv cov cuab yeej refinery - ntxiv txhim kho nws txoj kev ntseeg siab hauv kev pabcuam. Tsis tas li ntawd, cov alloy zoo weldability thiab fabricability tso cai rau refinery tu pab pawg kom ntseeg tau kho thiab hloov cov khoom raws li cov txheej txheem kev hloov nyob rau hauv lub sij hawm.
Cov Txheej Txheem Txheej Txheem nyob rau hauv Aggressive Chloride Ib puag ncig
Tshaj li cov ntawv thov tshwj xeeb tau piav qhia saum toj no, S32750 daim hlau ua cov khoom siv ntau yam rau txhua qhov chaw uas muaj chlorides thiab corrosion ua rau muaj kev hem thawj. Qhov no suav nrog cov txuas hniav hauv thaj chaw ntug dej hiav txwv, cov tsev lag luam nyob ze cov nroj tsuag tshuaj, cov chaw kho dej khib nyiab, thiab kev txhawb nqa cov qauv hauv marine terminals.
Npaj xaiv S32750 daim hlau rau koj qhov project tom ntej? Hu rau peb pab neeg muag khoom hnub no ntawm+86 19339900211los yogInfo@jnalloy.com. Muab koj cov xwm txheej thiab qhov ntev, thiab peb yuav xa cov lus qhia ua tiav, ntsuas qhov hnyav, tus nqi, thiab muaj nyob hauv 24 teev.
