Simbi isina tsvina mbiri ine chimiro chezvikamu zviviri, umo chikamu chevhoriyamu cheferrite neaustenite chingangoita 50%. Nekuda kwechimiro chayo chezvikamu zviviri, simbi idzi dzinosanganisa hunhu hwakanakisa hwesimbi dzisina tsvina dzeferritic neaustenitic. Kazhinji, chikamu cheferritic (body-centered cubic lattice) chinopa simba repamusoro remakanika, kusimba kwakanaka uye kuramba ngura kwakanaka, nepo chikamu cheaustenitic (face-centered cubic lattice) chichipa ductility yakanaka.
Nekuda kwekusanganiswa kwezvinhu izvi, simbi dzisina ngura mbiri dzinoshandiswa zvakanyanya mumaindasitiri epetrochemical, pulp nebepa, marine neesimba. Dzinogona kutsungirira mamiriro ekunze akaomarara, kuwedzera hupenyu hwebasa uye kushanda mumamiriro ekunze akaipisisa.
Zvinhu zvakasimba kwazvo zvinoderedza ukobvu nehuremu hwechikamu chacho. Semuenzaniso, simbi isina tsvina ine duplex inogona kupa simba rekugadzira uye kuramba kupinza kwesimbi isina tsvina kakapetwa katatu kusvika kana kana kupfuura simbi isina tsvina ine 316.
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 PREN shoma inodiwa pakugadzira filler metals. Semuenzaniso, DSS inoda PREN value ye35, nepo SDSS ichida PREN value ye40. 1 inoratidza DSS ne filler metal yayo inoenderana neGMAW neGTAW. Kazhinji, Cr content mu filler metal inoenderana neCr content mu base metal. Imwe nzira yekufunga nezvayo pakushandisa GTAW pamidzi ne hot channels ndeyekushandisa superalloy filler metals. Kana weld metal isina kufanana nekuda kwekusashanda zvakanaka, over-alloyed filler metal inogona kupa PREN inodiwa nedzimwe kukosha dze weld sampuli.
Semuenzaniso, kuratidza izvi, vamwe vagadziri vanokurudzira kushandisa waya yekuzadza yeSDSS (25% Cr) yeDSS (22% Cr) uye waya yekuzadza yeHDSS (27% Cr) yeSDSS (25% Cr) yeSDSS. Waya yekuzadza yeHDSS inogona kushandiswawo yeHDSS alloys. Iyi duplex yeaustenitic-ferritic 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 hydrogen stress cracking uye inodzivirira nharaunda dzine acid yakawanda kupfuura SDSS. Simba rayo guru rinoreva mari shoma yekugadzirisa pakugadzira mapaipi, sezvo simbi yesimbi yakasimba isingade ongororo yezvikamu zvakaganhurirwa uye zvinodiwa zvekugamuchira zvinogona kunge zvisinganyanyi kuchengetedza.
Zvichienderana nemhando dzakasiyana dzezvinhu zvekutanga, zvinodiwa nekanika uye mamiriro ekushanda, ndapota bvunzai nyanzvi yeDSS ne filler metal application musati maenderera mberi neprojekiti yenyu inotevera.
WELDER, yaimbonzi Practical Welding Today, inomiririra 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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