Chitsulo chosapanga dzimbiri chili ndi kapangidwe ka magawo awiri komwe gawo la voliyumu ya ferrite ndi austenite ndi pafupifupi 50%. Chifukwa cha kapangidwe kake ka magawo awiri, zitsulozi zimaphatikiza zabwino kwambiri za zitsulo zosapanga dzimbiri za ferritic ndi austenitic. Kawirikawiri, gawo la ferrite (lattice ya cubic centered body-centered) limapereka mphamvu zambiri zamakaniko, kulimba bwino komanso kukana dzimbiri, pomwe gawo la austenite (lattice ya cubic centered face-centered) limapereka ductility yabwino.
Kuphatikiza kwa zinthu izi ndi chifukwa chake zitsulo zosapanga dzimbiri ziwiri zimagwiritsidwa ntchito kwambiri m'mafakitale opanga petrochemical, pulp ndi mapepala, zam'madzi komanso zamagetsi. Zitha kupirira zinthu zowononga, kukulitsa nthawi yogwira ntchito, komanso kugwira ntchito m'malo ovuta kwambiri.
Zipangizo zolimba kwambiri zimakupatsani mwayi wochepetsa makulidwe ndi kulemera kwa gawo. Mwachitsanzo, chitsulo chosapanga dzimbiri cha super duplex chingapereke mphamvu yochulukitsa katatu kapena kanayi yobereka komanso kukana dzimbiri kuposa chitsulo chosapanga dzimbiri cha 316.
Zitsulo zosapanga dzimbiri ziwiri zimagawidwa m'magulu atatu kutengera kuchuluka kwa chromium (Cr) ndi kuchuluka kwa ma pitting resistance (PREN):
Chimodzi mwa zinthu zofunika kwambiri pakuweda DSS, SDSS, HDSS ndi zitsulo zosapanga dzimbiri zapadera za alloy ndikuwongolera magawo a welding.
Zofunikira pa njira yowotcherera ya mafakitale a petrochemical zimatsimikizira mtengo wocheperako wa PREN wofunikira pa zitsulo zodzaza. Mwachitsanzo, DSS imafuna PREN ya 35 ndipo SDSS imafuna PREN ya 40. Chithunzi 1 chikuwonetsa DSS ndi chitsulo chodzaza chomwe chikugwirizana ndi GMAW ndi GTAW. Kawirikawiri, kuchuluka kwa Cr mu chitsulo chodzaza kudzafanana ndi kwa chitsulo choyambira. Njira imodzi yoganizira mukamagwiritsa ntchito GTAW pa mizu ndi njira zotentha ndikugwiritsa ntchito zitsulo zodzaza za superalloy. Ngati chitsulo chosungunula sichili chofanana chifukwa cha luso loipa, chitsulo chosungunula chopangidwa mopitirira muyeso chingapereke PREN yomwe mukufuna ndi zina zomwe zili mu chitsanzo chosungunula.
Mwachitsanzo, opanga ena amalimbikitsa kugwiritsa ntchito waya wodzaza wa SDSS (25% Cr) pa ma alloy okhala ndi DSS (22% Cr), ndi waya wodzaza wa HDSS (27% Cr) mu ma alloy okhala ndi SDSS (25% Cr). Pa ma alloy okhala ndi HDSS, mutha kugwiritsanso ntchito waya wodzaza wa HDSS. Chitsulo chosapanga dzimbiri cha austenitic-ferritic duplex ichi chili ndi pafupifupi 65% ​​ferrite, 27% chromium, 6.5% nickel, 5% molybdenum ndipo chimaonedwa kuti ndi chotsika kuposa 0.015%.
Poyerekeza ndi SDSS, kulongedza kwa HDSS kuli ndi mphamvu zambiri zokolola komanso kukana dzimbiri ndi maenje. Kulinso ndi mphamvu zambiri zotsutsana ndi kupsinjika komwe kumabwera chifukwa cha haidrojeni komanso kukana kwambiri malo okhala ndi asidi wambiri kuposa SDSS. Mphamvu zake zambiri zimatanthauza kuti zinthu sizingakonzedwe bwino panthawi yopanga mapaipi, chifukwa kusanthula kwa zinthu zomaliza sikofunikira pa chitsulo chosungunula chomwe chili ndi mphamvu yofanana, ndipo njira zovomerezeka sizingakhale zosamala kwambiri.
Popeza pali mitundu yosiyanasiyana ya zipangizo zoyambira, zofunikira pamakina, komanso momwe ntchito ikuyendera, chonde ganizirani kufunsa katswiri wa DSS application ndi filler metal musanayambe ntchito yanu yotsatira.
WELDER, yomwe kale inali Practical Welding Today, ikuwonetsa anthu enieni omwe amapanga zinthu zomwe timagwiritsa ntchito komanso zomwe timagwira ntchito nazo tsiku lililonse. Magazini iyi yakhala ikutumikira anthu ogwiritsira ntchito welding ku North America kwa zaka zoposa 20.
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