Stainless hlau tau muab faib ua ntau pawg feem ntau vim lawv qhov sib txawv microstructure theem. Txawm hais tias txhua qib ntawm stainless hlau muaj qhov sib txawv microstructure theem, microstructure ntawm duplex stainless hlau zoo ib yam li ob chav kawm ntawm stainless hlau, npe hu ua ferrite stainless hlau thiab austenitic stainless hlau. Duplex stainless hlau muaj cov qauv sib xyaw ntawm austenite thiab ferrite. Qhov piv ntawm ob lub qauv siv lead ua yog sib npaug, uas txhais tau hais tias 50 feem pua ntawm cov hlau duplex muaj ob qho tib si austenite thiab ferrite. Duplex stainless hlau tuaj yeem muab faib ua peb pawg, ib qho yog super duplex stainless hlau. Yog vim li cas lub super duplex kuj muaj ob chav microstructure. Lub duplex theem muaj siab heev PREN los yog pitting kuj sib npaug. Tus nqi yog los ntawm 22 mus rau 45.
Los ntawm tag nrho peb pawg duplex, nws yog super duplex hom stainless hlau uas muaj high-end corrosion kuj. Tus nqi PREN ntawm super duplex ranges ntawm 38 mus rau 45. Cov tshuaj muaj pes tsawg leeg ntawm cov hlau stainless no yog alloyed heev, siab dua li cov pa stainless hlau alloy, xws li qib 304 lossis txawm 316. Vim tias lawv yog cov alloyed heev, lawv nyiam muab corrosion. tsis kam mus rau ib tug superior degree. Lawv kuj muaj lub zog mechanical siab. Thaum lub zog thiab corrosion kuj ntawm cov hlau stainless hlau los ntawm high alloying, qhov no yog vim li cas super duplex qib feem ntau nyuaj rau ua hauj lwm nrog. Tsis tas li ntawd, kev tsim cov theem ntawm intermetallic yog ua tau yooj yim dua los ntawm cov ntsiab lus siab ntawm cov ntsiab lus xws li chromium, npib tsib xee, molybdenum, nitrogen thiab txawm tias tungsten. Vim hais tias ntawm cov theem intermetallic, qhov cuam tshuam tsis kam ntawm super duplex stainless hlau txo qis heev. Tias yog vim li cas cov neeg yuav khoom yuav tsum tau nrog cov tuam txhab lossis cov neeg muag khoom uas tsis yog tsuas yog muaj kev paub dhau los, tab sis kuj yuav muab cov khoom zoo. Nyob rau hauv cov ntaub ntawv ntawm stainless hlau qib fabricated siv txoj kev tsis ncaj ncees lawm, cov khoom kawg yuav ua tau tsis zoo heev.