Duplex stainless hlau muaj ob-theem microstructure uas qhov ntim feem ntawm ferrite thiab austenite yog li 50%. Vim lawv ob-theem microstructure, cov hlau no muab cov khoom zoo tshaj plaws ntawm ferritic thiab austenitic stainless hlau. Feem ntau, ferrite theem (lub cev-centered cubic lattice) muab lub zog siab, zoo toughness thiab zoo corrosion tsis kam, thaum austenite theem (lub ntsej muag-centered cubic lattice) muab ductility zoo.
Qhov kev sib xyaw ua ke ntawm cov khoom no yog vim li cas cov hlau tsis xeb duplex siv dav hauv kev lag luam petrochemical, pulp thiab ntawv, marine thiab kev tsim hluav taws xob. Lawv tuaj yeem tiv taus cov xov xwm corrosive, ntev lub sijhawm pabcuam, thiab ua haujlwm hauv cov xwm txheej ib puag ncig hnyav dua.
Cov ntaub ntawv muaj zog siab tso cai rau koj txo qhov tuab thiab qhov hnyav ntawm ib feem. Piv txwv li, super duplex stainless hlau tuaj yeem muab peb mus rau plaub zaug siab dua qhov muaj zog thiab tiv taus pitting corrosion ntau dua li 316 stainless hlau.
Cov hlau tsis xeb duplex raug muab faib ua peb qib raws li cov ntsiab lus gravimetric chromium (Cr) thiab pitting resistance equivalent number (PREN):
Ib qho ntawm cov yam tseem ceeb ntawm kev vuam DSS, SDSS, HDSS thiab cov hlau tsis xeb tshwj xeeb yog kev tswj cov kev ntsuas vuam.
Cov kev cai ntawm cov txheej txheem vuam hauv kev lag luam petrochemical txiav txim siab qhov tsawg kawg nkaus PREN tus nqi xav tau rau cov hlau filler.Piv txwv li, DSS xav tau PREN ntawm 35 thiab SDSS xav tau PREN ntawm 40.Daim duab 1 qhia DSS thiab nws cov hlau filler sib phim rau GMAW thiab GTAW.Feem ntau, cov ntsiab lus Cr ntawm cov hlau filler yuav phim cov hlau hauv paus.Ib qho kev xyaum uas yuav tsum xav txog thaum siv GTAW rau cov hauv paus thiab cov channel kub yog kev siv cov hlau filler superalloy.Yog tias cov hlau weld tsis sib xws vim yog cov txheej txheem tsis zoo, cov hlau filler over-alloyed tuaj yeem muab PREN thiab lwm yam nqi xav tau rau cov qauv welded.
Ua piv txwv los qhia qhov no, qee cov chaw tsim khoom pom zoo kom siv SDSS filler wire (25% Cr) rau DSS-based alloys (22% Cr), thiab HDSS filler wire (27% Cr) hauv SDSS (25% Cr) based alloys. Rau HDSS based alloys, koj tuaj yeem siv HDSS filler wire. Cov hlau austenitic-ferritic duplex stainless hlau no muaj kwv yees li 65% ​​ferrite, 27% chromium, 6.5% nickel, 5% molybdenum thiab suav tias yog tsawg dua 0.015% carbon qis.
Piv rau SDSS, HDSS packing muaj zog dua thiab tiv taus kev xeb pitting thiab crevice corrosion zoo dua. Nws kuj muaj zog dua rau kev tawg ntawm kev ntxhov siab los ntawm hydrogen thiab tiv taus cov chaw acidic ntau dua li SDSS. Nws lub zog siab txhais tau tias tus nqi txij nkawm qis dua thaum lub sijhawm tsim cov yeeb nkab, vim tias tsis tas yuav tsum muaj kev tshuaj xyuas cov ntsiab lus finite rau cov hlau weld uas muaj zog sib xws, thiab cov qauv lees txais tuaj yeem tsis tshua muaj kev txuag.
Vim muaj ntau yam khoom siv, cov kev xav tau kho tshuab thiab cov xwm txheej kev pabcuam, thov xav txog kev sab laj nrog tus kws tshaj lij DSS daim ntawv thov thiab cov hlau filler ua ntej pib koj qhov project tom ntej.
WELDER, yav tas los hu ua Practical Welding Today, qhia txog cov neeg tiag tiag uas ua cov khoom uas peb siv thiab ua haujlwm nrog txhua hnub. Phau ntawv xov xwm no tau pab cov zej zog vuam hauv North America tau ntau tshaj 20 xyoo.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The FABRICATOR, nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Cov ntawv xov xwm digital ntawm The Tube & Pipe Journal tam sim no nkag tau tag nrho, muab kev nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.
Txaus siab rau kev nkag mus rau tag nrho cov ntawv digital ntawm STAMPING Journal, uas muab cov kev nce qib tshiab tshaj plaws, cov kev coj ua zoo tshaj plaws thiab cov xov xwm kev lag luam rau kev lag luam hlau stamping.
Tam sim no nrog kev nkag mus rau tag nrho cov ntawv digital ntawm The Fabricator en Español, nkag mus tau yooj yim rau cov peev txheej muaj txiaj ntsig hauv kev lag luam.