Duplex simbi isina tsvina ine maviri-phase microstructure umo vhoriyamu chikamu cheferrite uye austenite chinenge 50%.Nekuda kwemaitiro avo maviri-phase microstructure, masimbi aya anobatanidza zvinhu zvakanakisisa zveferritic uye austenitic stainless steels.Muzhinji, chikamu cheferrite (body-centered cubic lattice) inopa yakakwirira mechanical resistance, yakanaka kusimba, yakanaka kusimba uye yakanaka cortex. (face-centered cubic lattice) inopa yakanaka ductility.
Iko kusanganiswa kwezvinhu izvi ndosaka duplex simbi isina tsvina inoshandiswa zvakanyanya mu petrochemical, pulp uye pepa, marine uye magetsi ekugadzira industries.Vanogona kutsungirira corrosive media, kuwedzera nguva yebasa, uye kushanda mumamiriro ekunze akanyanya.
High-simba zvinhu zvinokubvumira kuderedza chikamu ukobvu uye uremu.Semuyenzaniso, super duplex Stainless simbi inogona kupa katatu kana mana yakakwirira goho simba uye yakakwirira kuramba pitting ngura kupfuura 316 Stainless simbi.
Duplex simbi isina tsvina inoiswa muzvikamu zvitatu zvichienderana negiravimetric chromium (Cr) zvirimo uye pitting kuramba yakaenzana nhamba (PREN):
Chimwe chezvinhu zvakakosha zveWelding DSS, SDSS, HDSS uye yakakosha alloy Stainless simbi kutonga kwewelding paramita.
Iyo petrochemical industry welding process zvinodiwa inosarudza hushoma PREN kukosha kunodiwa kune filler metals.Semuenzaniso, DSS inoda PREN ye35 uye SDSS inoda PREN ye40.Mufananidzo 1 unoratidza DSS uye inofananidzwa nesimbi yefiller yeGMAW neGTAW. Kazhinji, iyo Cr content yefiller metal ichafanana neyoyo yekudzidzira kuti ishandise midzi yeGTA ichishandisa midzi yeGTA. ye superalloy filler metals.Kana iyo weld simbi isiri yunifomu nekuda kwemaitiro asina kunaka, over-alloyed filler simbi inogona kupa inodiwa PREN uye humwe hunokosha hwesampu yakasungwa.
Semuenzaniso kuratidza izvi, vamwe vagadziri vanokurudzira kushandisa SDSS filler waya (25% Cr) yeDSS-based alloys (22% Cr), uye HDSS filler waya (27% Cr) muSDSS (25% Cr) based alloys.Kune HDSS based alloys, unogona zvakare kushandisa HDSS filler waya. 27% chromium, 6.5% nickel, 5% molybdenum uye inonzi ishoma pane 0.015% yakaderera kabhoni.
Kuenzaniswa neSDSS, HDSS kurongedza kune simba regoho rakakwirira uye kuramba kuri nani kugomba uye corrosion corrosion.Iyo inewo yakakwirira kupikisa hydrogen-induced stress cracking uye yakakwirira kupikisa kune yakasimba acidic nharaunda kupfuura SDSS.Kusimba kwayo kwepamusoro kunoreva kuderera kwekugadzirisa mazinga panguva yekugadzirwa kwepombi, sezvo finite element analysis isingadiwi kune weld metal yesimba rinofananidzira rinogona kuva shoma rekuchengetedza.
Tichifunga kuwanda kwezvinhu zvepasi, zvinodiwa zvemakanika uye mamiriro ebasa, ndapota funga kubvunza neDSS application uye yekuzadza simbi nyanzvi usati watanga chirongwa chako chinotevera.
WELDER, yaichimbova Practical Welding Nhasi, inoratidza vanhu chaivo vanogadzira zvigadzirwa zvatinoshandisa uye kushanda nazvo zuva nezuva. Magazini ino yakashandira nharaunda yewelding muNorth America kwemakore anopfuura 20.
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