405 vs 409 Ferritic Stainless Steels: Tsawg-Tus nqi Corrosion Resistance rau me me ib puag ncig

 

Dab tsi yog lawv cov ntsiab lus tseem ceeb thiab kev ua haujlwm zoo?

405 (UNS S40500) muaj 11.5-14.5% Cr, Tsawg dua los yog sib npaug li 0.08% C, thiab ib qho me me ntawm txhuas ntxiv, xa cov khoom nruab nrab corrosion thiab zoo weldability rau nyias{11}} ntsuas qhov chaw. Nws muaj lub zog tensile ntawm ~ 450MPa thiab yog sib nqus ntawm txhua qhov kub thiab txias.409 (UNS S40900) nta 10.5-11.75% Cr, titanium stabilization, thiab qis carbon cov ntsiab lus (tsawg dua lossis sib npaug li 0.03%), txhim kho nws cov kev tiv thaiv siab rau siab {{18} oxidation. Nws yog qib ferritic uas siv dav tshaj plaws rau kev siv lub tshuab hluav taws xob, nrog rau cov cua sov ua haujlwm txog li 650℃.Ob qib yog npib tsib xee dawb, muab 30-40% kev txuag nqi piv rau qib austenitic zoo li 304 rau kev siv tsis muaj corrosive.

Lawv cov corrosion thiab kub tsis kam sib piv li cas hauv -siv ntiaj teb?

405 ua tau zoo nyob rau hauv qhov chaw qhuav hauv tsev, xws li architectural trim, furnace liners, thiab industrial kiv cua, tab sis yuav xeb nyob rau hauv cov av ntub los yog ntug hiav txwv chaw yam tsis muaj kev tiv thaiv coatings.409's titanium stabilization txhim kho nws cov kev tiv thaiv rau cov pa roj corrosion thiab siab -kub oxidation, ua rau nws tus qauv gaspetic default. nyob rau hauv me ntsis atmospheric Cov xwm txheej, 405 muaj qhov zoo dua corrosion kuj dua li 409 vim nws cov ntsiab lus chromium siab dua, tab sis tsis muaj qib twg tuaj yeem phim 304 qhov kev ua tau zoo hauv qhov chaw ntub dej.

Dab tsi yog daim ntawv thov raug cai rau ob qib no?

405 yog siv rau nyias -gauge welded qhov chaw, suav nrog kev lag luam ductwork, cov khoom siv ua liaj ua teb, thiab cov ntxaij hlau zoo nkauj uas xav tau kev tiv thaiv corrosion yooj yim thiab tus nqi qis.409 dominates automotive exhaust market, siv rau tailpipes, mufflers, thiab tso pa tawm manifolds nyob rau hauv standard tsheb neeg nrog caij. Nws kuj yog siv rau cov raj kub exchanger nyob rau hauv qis -kub industrial systems.Ob qib yog tsis tsim nyog rau marine, tshuaj, los yog zaub mov ua daim ntaub ntawv, qhov twg siab dua chromium los yog molybdenum cov ntsiab lus.

Tus nqi thiab kev tsim khoom lag luam yog dab tsi- tawm ntawm 405 thiab 409?

409 yog qhov pheej yig dua (5-8%) dua li 405, vim nws cov ntsiab lus chromium qis txo cov nqi raw khoom, ua rau nws yog qhov kev xaiv sab saum toj rau siab - ntim automotive ntau lawm.405 muaj weldability zoo dua 409 rau tuab-walled qhov chaw, raws li nws cov txhuas ntxiv txo qhov kev pheej hmoo ntawm weld cracking mus rau 205℃preheating. welding tuab cov khoom, thaum 405 tuaj yeem welded nrog cov qauv GTAW yam tsis muaj cov kauj ruam ua ntej.

Dab tsi yog cov ntsiab lus tseem ceeb ntawm kev ua thiab kev saib xyuas?

Thaum vuam 409, siv qhov sib txuam 409 muab tub lim hlau thiab tswj cov khoom siv hluav taws xob kom tsis txhob muaj kev kub ntxhov; post-weld tu yog pom zoo kom tshem tawm oxide nplai los ntawm cov khoom seem.Rau 405, siv ferritic muab tub lim hlau (xws li, ER405) kom muaj kev tiv thaiv corrosion nyob rau hauv cov pob qij txha, thiab tsis txhob ntev raug kub siab tshaj 600℃los tiv thaiv embrittlement.Ob qib tau txais txiaj ntsig los ntawm cov hmoov txheej sab nraum zoov los yog siv cov kev pab cuam ntev ntev. corrosive ib puag ncig.