Duplex stainless hlau muaj ob-theem microstructure, nyob rau hauv uas lub ntim feem ntawm ferrite thiab austenite yog hais txog 50%.Vim lawv ob-theem microstructure, cov hlau no muab cov khoom zoo tshaj plaws ntawm ferritic thiab austenitic stainless hlau.Feem ntau, ferritic theem (lub cev-centered cubic lattice) muab cov neeg kho tshuab siab zog, zoo toughness thiab zoo corrosion kuj, thaum lub sij hawm austenitic (lub ntsej muag-centered cubic lattice) muab zoo ductility.
Vim yog kev sib xyaw ntawm cov khoom no, duplex stainless hlau yog dav siv hauv petrochemical, pulp thiab ntawv, marine thiab zog kev lag luam.Lawv tuaj yeem tiv taus ib puag ncig hnyav, txuas ntxiv kev pab cuam lub neej thiab ua haujlwm hauv ib puag ncig huab cua ntau dua.
Cov ntaub ntawv muaj zog heev txo cov thickness thiab qhov hnyav ntawm ib feem.Piv txwv li, super duplex stainless hlau tuaj yeem muab peb mus rau plaub zaug lub zog tawm los thiab pitting tsis kam ntawm 316 stainless hlau.
Duplex stainless hlau tau muab faib ua peb qib raws li gravimetric chromium (Cr) cov ntsiab lus thiab pitting tsis kam sib npaug (PREN):
Ib qho tseem ceeb ntawm vuam DSS, SDSS, HDSS thiab tshwj xeeb alloy stainless hlau yog kev tswj ntawm vuam tsis.
Cov kev cai rau cov txheej txheem vuam hauv kev lag luam petrochemical dictate qhov tsawg kawg nkaus PREN xav tau rau cov hlau muab tub lim.Piv txwv li, DSS xav tau tus nqi PREN ntawm 35, thaum SDSS xav tau PREN tus nqi ntawm 40. 1 qhia DSS thiab nws cov khoom siv hlau sib txuas rau GMAW thiab GTAW.Raws li txoj cai, Cr cov ntsiab lus hauv cov hlau muab tub lim sib haum rau cov ntsiab lus Cr hauv lub hauv paus hlau.Ib txoj hauv kev los xav txog thaum siv GTAW rau cov hauv paus hniav thiab cov kab kub kub yog kev siv cov khoom siv superalloy muab tub lim.Yog tias cov hlau vuam tsis sib haum xeeb vim yog cov txheej txheem tsis zoo, cov hlau tsis zoo tshaj plaws tuaj yeem muab qhov xav tau PREN thiab lwm yam txiaj ntsig rau cov qauv weld.
Ua piv txwv, los ua kom pom qhov no, qee cov tuam txhab pom zoo siv SDSS (25% Cr) muab tub lim rau DSS (22% Cr) raws li cov alloys thiab HDSS (27% Cr) muab tub lim rau SDSS (25% Cr) raws li alloys.HDSS muab tub lim kuj tuaj yeem siv rau HDSS alloys.Qhov no austenitic-ferritic duplex muaj kwv yees li 65% ​​ferrite, 27% chromium, 6.5% nickel, 5% molybdenum thiab suav tias yog tsawg dua 0.015% cov pa roj carbon tsawg.
Muab piv rau SDSS, HDSS packing muaj lub zog ntau dua thiab zoo dua rau pitting thiab crevice corrosion.Nws kuj tseem muaj kev tiv thaiv siab dua rau hydrogen kev ntxhov siab tawg thiab siab dua rau cov acidic ib puag ncig ntau dua li SDSS.Nws lub zog siab txhais tau hais tias kev saib xyuas qis dua hauv cov yeeb nkab ntau lawm, vim tias cov hlau txuas ntawm lub zog txaus tsis tas yuav tsum muaj kev txheeb xyuas qhov tseeb thiab cov txheej txheem kev lees paub tuaj yeem ua rau qis qis.
Muab ntau yam ntawm cov ntaub ntawv hauv paus, cov kev xav tau ntawm kev siv tshuab thiab kev ua haujlwm, thov sab laj nrog DSS thiab muab tub lim tshwj xeeb ntawm daim ntawv thov hlau ua ntej pib koj qhov project tom ntej.
WELDER, yav tas los hu ua Practical Welding Niaj hnub no, sawv cev rau cov neeg tiag tiag uas ua cov khoom peb siv thiab ua haujlwm nrog txhua hnub.Phau ntawv xov xwm no tau ua haujlwm rau cov koom haum vuam hauv North America rau ntau tshaj 20 xyoo.
Tam sim no nrog tag nrho nkag mus rau FABRICATOR cov ntawv luam tawm digital, nkag tau yooj yim rau cov peev txheej lag luam muaj txiaj ntsig.
Cov ntawv digital ntawm The Tube & Pipe Journal yog tam sim no nkag mus tau yooj yim, muab kev nkag tau yooj yim rau cov khoom lag luam muaj txiaj ntsig.
Tau txais tag nrho cov digital nkag mus rau STAMPING Journal, muaj cov thev naus laus zis tshiab, kev coj ua zoo tshaj plaws thiab xov xwm kev lag luam rau kev lag luam hlau stamping.
Tam sim no nrog rau tag nrho cov kev nkag mus rau Cov Fabricator en Español, koj muaj kev nkag tau yooj yim rau kev lag luam muaj txiaj ntsig.