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, theem ferritic (lub cev-centered cubic lattice) muab lub zog siab, zoo toughness thiab zoo corrosion tsis kam, thaum theem austenitic (lub ntsej muag-centered cubic lattice) muab ductility zoo.
Vim yog kev sib xyaw ua ke ntawm cov yam ntxwv no, cov hlau tsis xeb duplex yog siv dav hauv kev lag luam petrochemical, pulp thiab ntawv, marine thiab zog. Lawv tuaj yeem tiv taus qhov chaw ib puag ncig hnyav, ntev lub neej kev pabcuam thiab ua haujlwm hauv cov xwm txheej ib puag ncig hnyav dua.
Cov khoom siv muaj zog siab ua rau qhov tuab thiab qhov hnyav ntawm qhov khoom txo qis. Piv txwv li, super duplex stainless hlau tuaj yeem muab peb mus rau plaub npaug ntawm lub zog tso zis thiab kev tiv thaiv pitting ntawm 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 rau cov txheej txheem vuam hauv kev lag luam petrochemical qhia txog qhov tsawg kawg nkaus PREN xav tau rau cov hlau filler. Piv txwv li, DSS xav tau tus nqi PREN ntawm 35, thaum SDSS xav tau tus nqi PREN ntawm 40. 1 qhia DSS thiab nws cov hlau filler sib xws rau GMAW thiab GTAW. Raws li txoj cai, cov ntsiab lus Cr hauv cov hlau filler sib xws rau cov ntsiab lus Cr hauv cov hlau hauv paus. Ib txoj hauv kev los xav txog thaum siv GTAW rau cov hauv paus thiab cov channel kub yog kev siv cov hlau superalloy filler. 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 weld.
Ua piv txwv, los ua pov thawj qhov no, qee cov chaw tsim khoom pom zoo kom siv SDSS (25% Cr) cov hlau nplaum rau DSS (22% Cr) raws li cov hlau nplaum thiab HDSS (27% Cr) cov hlau nplaum rau SDSS (25% Cr) raws li cov hlau nplaum. HDSS cov hlau nplaum kuj tseem siv tau rau HDSS cov hlau nplaum. Cov austenitic-ferritic duplex 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 lub zog siab dua thiab tiv taus qhov pitting thiab crevice corrosion zoo dua. Nws kuj muaj kev tiv taus hydrogen stress cracking thiab tiv taus cov kua qaub ntau dua li SDSS. Nws lub zog siab txhais tau tias cov nqi kho qis dua hauv kev tsim cov yeeb nkab, vim tias cov hlau weld uas muaj zog txaus tsis tas yuav tsum tau tshuaj xyuas cov ntsiab lus finite thiab cov qauv lees txais tuaj yeem tsis tshua muaj kev txuag.
Vim muaj ntau yam khoom siv, cov kev xav tau ntawm cov khoom siv kho tshuab thiab cov xwm txheej ua haujlwm, thov sab laj nrog DSS thiab cov kws tshwj xeeb siv hlau ua ntej txuas ntxiv mus rau koj qhov project tom ntej.
WELDER, yav tas los hu ua Practical Welding Today, sawv cev rau 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, yooj yim nkag mus 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.
Tau txais kev nkag mus rau STAMPING Journal tag nrho, uas muaj cov thev naus laus zis tshiab, cov kev coj ua zoo tshaj plaws thiab xov xwm kev lag luam rau kev lag luam hlau stamping.
Tam sim no nrog kev nkag mus rau The Fabricator en Español tag nrho, koj muaj kev nkag mus rau cov peev txheej muaj txiaj ntsig zoo hauv kev lag luam.