Simbi isina tsvina mbiri ine chimiro chezvikamu zviviri umo chikamu chevhoriyamu cheferrite neaustenite chingangoita 50%. Nekuda kwechimiro chavo chezvikamu zviviri, simbi idzi dzinosanganisa hunhu hwakanakisa hwesimbi dzisina tsvina dzeferritic neaustenitic. Kazhinji, chikamu cheferrite (lattice ye cubic centered body) chinopa simba repamusoro remakanika, kusimba kwakanaka uye kuramba ngura kwakanaka, nepo chikamu che austenite (lattice ye cubic centered face-centered) chichipa ductility yakanaka.
Kusanganiswa kwezvinhu izvi ndiko kunoita kuti simbi dzisina ngura mbiri dzishandiswe zvakanyanya mumaindasitiri epetrochemical, pulp nebepa, emugungwa uye ekugadzira magetsi. Dzinogona kutsungirira ngura, kuwedzera nguva yekushanda, uye kushanda mumamiriro ezvinhu akaipisisa.
Zvinhu zvakasimba zvinokubvumira kuderedza ukobvu hwezvikamu nehuremu. Semuenzaniso, simbi isina tsvina ine duplex inogona kupa simba rekugadzira rakapetwa katatu kusvika kana kana uye inodzivirira ngura kupfuura 316 simbi isina tsvina.
Simbi mbiri dzisingapindi simbi dzinoiswa muzvikamu zvitatu zvichienderana nehuwandu hwegravimetric chromium (Cr) uye nhamba yakaenzana yekudzivirira makomba (PREN):
Chimwe chezvinhu zvakakosha pakushongedza DSS, SDSS, HDSS uye simbi dzisina ngura dzakasarudzika inyaya yekudzora maparamita ekushongedza.
Zvinodiwa pakugadzira welding muindasitiri yepetrochemical zvinosarudza kukosha kwePREN kunodiwa pasimbi dzinozadza. Semuenzaniso, DSS inoda PREN ye35 uye SDSS inoda PREN ye40. Mufananidzo 1 unoratidza DSS nesimbi yayo inozadza yeGMAW neGTAW. Kazhinji, huwandu hweCr hwesimbi inozadza hunoenderana nehwesimbi yepasi. Imwe tsika yekufunga nezvayo pakushandisa GTAW pamidzi nenzizi dzinopisa ndeyekushandisa superalloy filler metals. Kana simbi inozadza isina kufanana nekuda kwehunyanzvi husina kunaka, simbi inozadza yakawanda inogona kupa PREN inodiwa nezvimwe zvinhu zvemuenzaniso we welded.
Semuenzaniso wekuratidza izvi, vamwe vagadziri vanokurudzira kushandisa waya yekuzadza yeSDSS (25% Cr) yeDSS-based alloys (22% Cr), uye waya yekuzadza yeHDSS (27% Cr) muSDSS (25% Cr) based alloys. Kune alloys dzakavakirwa paHDSS, unogona zvakare kushandisa waya yekuzadza yeHDSS. Iyi austenitic-ferritic duplex stainless steel ine inenge 65% ​​ferrite, 27% chromium, 6.5% nickel, 5% molybdenum uye inoonekwa seisina 0.015% low carbon.
Zvichienzaniswa neSDSS, HDSS packing ine simba guru rekugadzira uye inodzivirira ngura iri nani kubva pakuora kwegomba kusvika pakukora. Ine simba guru rekudzivirira kuputika kwehydrogen-induced stress uye inodzivirira nharaunda dzine acid yakawanda kupfuura SDSS. Simba rayo guru rinoreva mwero wakaderera wekuchengetedza panguva yekugadzira mapaipi, sezvo finite element analysis isingadiwi kuti simbi yesimbi ienderane nesimba, uye nzira dzekugamuchira dzinogona kunge dzisina kunyanya kuchengetedzeka.
Zvichienderana nemhando dzakasiyana dzezvinhu zvekutanga, zvinodiwa nekanika uye mamiriro ebasa, ndapota funga nezvekubvunza nyanzvi yeDSS application uye filler metal usati watanga chirongwa chako chinotevera.
WELDER, yaimbonzi Practical Welding Today, inoratidza vanhu chaivo vanogadzira zvigadzirwa zvatinoshandisa uye zvatinoshanda nazvo zuva nezuva. Magazini iyi yave ichishandira nharaunda yevanosanganisa simbi muNorth America kwemakore anopfuura makumi maviri.
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