Chitsulo chosapanga dzimbiri cha Duplex chili ndi magawo awiri a microstructure momwe gawo la voliyumu ya ferrite ndi austenite ili pafupi 50%. Chifukwa cha microstructure yawo ya magawo awiri, zitsulozi zimagwirizanitsa zinthu zabwino kwambiri za ferritic ndi austenitic zosapanga dzimbiri zosapanga dzimbiri. c lattice) imapereka ductility yabwino.
Kuphatikizika kwa zinthuzi ndi chifukwa chake zitsulo zosapanga dzimbiri za duplex zimagwiritsidwa ntchito kwambiri mu petrochemical, zamkati ndi mapepala, m'madzi ndi mafakitale opanga magetsi.Amatha kupirira zofalitsa zowononga, kuwonjezera nthawi yautumiki, ndikugwira ntchito m'malo owopsa kwambiri a chilengedwe.
Zida zamphamvu kwambiri zimakulolani kuti muchepetse makulidwe a gawo ndi kulemera kwake.Mwachitsanzo, chitsulo chosapanga dzimbiri cha super duplex chingapereke mphamvu zokolola katatu kapena kanayi komanso kukana kwapamwamba kwa pitting corrosion kuposa 316 zitsulo zosapanga dzimbiri.
Zitsulo zosapanga dzimbiri za Duplex zimagawidwa m'makalasi atatu kutengera zomwe zili ndi gravimetric chromium (Cr) ndi nambala yofananira ndi pitting resistance (PREN):
Chimodzi mwazinthu zazikulu za kuwotcherera DSS, SDSS, HDSS ndi zitsulo zapadera za aloyi zosapanga dzimbiri ndikuwongolera magawo owotcherera.
Zofunikira pakuwotcherera kwa mafakitale a petrochemical zimatsimikizira mtengo wochepera wa PREN wofunikira pazitsulo zodzaza zitsulo.Mwachitsanzo, DSS imafuna PREN ya 35 ndipo SDSS imafuna PREN ya 40.Figure 1 ikuwonetsa DSS ndi zitsulo zake zofananira zodzaza GMAW ndi GTAW.Mwachizoloŵezi, Cr zomwe zili muzitsulo zodzaza zitsulo zidzafanana ndi zomwe zimagwiritsidwa ntchito pogwiritsira ntchito zitsulo zamtundu wa GTA ndi GTA. Filler metals.Ngati chitsulo chowotcherera sichili yunifolomu chifukwa cha luso losauka, zitsulo zodzaza ndi alloyed zimatha kupereka PREN yofunidwa ndi zinthu zina zachitsanzo chowotcherera.
Monga chitsanzo kusonyeza izi, opanga ena amalimbikitsa kugwiritsa ntchito SDSS filler waya (25% Cr) kwa DSS-based alloys (22% Cr), ndi HDSS filler waya (27% Cr) mu SDSS (25% Cr) based alloys.Pa HDSS based alloys, mutha kugwiritsanso ntchito HDSS filler waya. chromium, 6.5% nickel, 5% molybdenum ndipo amaonedwa kuti ndi ochepera 0.015% carbon low.
Poyerekeza ndi SDSS, HDSS kulongedza kuli ndi mphamvu zokolola zambiri komanso kukana kwabwino kwa pitting ndi corrosion corrosion. Imakhalanso ndi kukana kwakukulu kwa kuwonongeka kwa hydrogen-induced stress and high resistance to strongly acidic environments than SDSS.Kulimba kwake kwakukulu kumatanthauza kuchepetsa kukonzanso panthawi yopanga mapaipi, popeza kusanthula kwazinthu zomaliza sikofunikira kuti zitsulo zowotcherera za mphamvu zofananira zikhale zochepa, ndi kuvomereza kocheperako.
Poganizira kuchuluka kwa zida zoyambira, zofunikira zamakina ndi magwiridwe antchito, chonde ganizirani kufunsana ndi pulogalamu ya DSS komanso katswiri wazodzaza zitsulo musanayambe ntchito yotsatira.
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