Duplex Stainless simbi pombi imhando yesimbi inosanganisa akawanda akanakisa zvivakwa senge yakanakisa corrosion resistance, simba guru, uye nyore kugadzira nekugadzirisa. Zvimiro zvavo zvemuviri zviri pakati pe austenitic Stainless simbi uye ferritic Stainless simbi, asi padyo neferritic Stainless simbi uye kabhoni simbi. Kupokana kune chloride pitting uye crevice corrosion ye duplex Stainless simbi pombi kune hukama neiyo chromium, molybdenum, tungsten, uye nitrogen zvemukati. Inogona kufanana ne316 simbi isina tsvina kana yakakwirira kudarika mvura yegungwa isina tsvina yakadai se6% Mo austenitic stainless simbi. Kugona kwemapombi ese ane duplex Stainless simbi kuramba chloride stress corrosion fracture yakasimba zvakanyanya kupfuura iyo ye300 series austenitic stainless steel, uye simba rayo zvakare rakakwira zvakanyanya kudarika austenitic stainless simbi ichiratidza kunaka kwepurasitiki nekuoma.

Duplex Stainless simbi pombi inodaidzwa kuti "duplex" nekuti yayo metallographic microstructure inoumbwa nemhando mbiri dzesimbi isina tsvina, ferrite uye austenite. Mumufananidzo uri pazasi, iyo yero austenite chikamu chakakomberedzwa nebhuruu ferrite chikamu. Kana duplex Stainless simbi pombi yanyunguduka, inotanga kusimba kuita ferrite chimiro chakazara kana ichinge yasimba kubva kumvura. Sezvo zvinhu zvinotonhora kusvika kukushisa kwekamuri, inenge hafu yezviyo zveferrite inoshanduka kuita austenite tsanga. Mhedzisiro ndeyekuti inenge 50% ye microstructure ndiyo austenite phase uye 50% ndiyo ferrite phase.

Duplex simbi isina tsvina pombi ine maviri-chikamu microstructure ye austenite uye ferrite
Hunhu hwe duplex Stainless simbi pombi
01-Simba repamusoro: Simba re duplex Stainless simbi pombi inokwana kaviri iyo yeyakajairika austenitic Stainless simbi kana ferritic Stainless simbi. Izvi zvinobvumira vagadziri kuderedza kukora kwemadziro mune mamwe maapplication.

02-Yakanaka kuoma uye ductility: Pasinei nekusimba kwepamusoro kwemapombi e duplex simbi isina tsvina, anoratidza kunaka kwepurasitiki uye kuoma. Kuoma uye kusimba kwemapombi maviri esimbi isina tsvina ari nani pane aya eferritic Stainless simbi uye kabhoni simbi, uye anongoramba akasimba kunyangwe pakudzikira kwakanyanya se -40°C/F. Asi haikwanise kusvika padanho rekunaka kwe austenitic Stainless simbi. Minimum mechanical zvivakwa zviganhu zve duplex Stainless simbi mapaipi anotsanangurwa neASTM uye EN zviyero

03-Corrosion kuramba: Kuramba kwecorrosion kwesimbi isina tsvina kunonyanya kuenderana nemakemikari ayo. Duplex Stainless simbi mapaipi anoratidza yakakwira corrosion kuramba mune akawanda maapplication nekuda kweyakanyanya chromium yemukati, iyo yakanaka muoxidizing acids, uye huwandu hwakakwana hwemolybdenum uye nickel kutsungirira kudzikisira kuri pakati nepakati Corrosion mu acid media. Kugona kwe duplex simbi isina simbi pombi kuramba chloride ion pitting uye crevice corrosion zvinoenderana ne chromium, molybdenum, tungsten, uye nitrogen yemukati. Iyo yakanyanya kukwirisa chromium, molybdenum uye nitrogen zviri mukati me duplex Stainless simbi pombi zvinovapa kushingirira kune chloride pitting uye mukaha wecorrosion. Vanouya mumhando dzakasiyana-siyana dzekudzivisa ngura, kubva kumagiredhi akaenzana ne316 simbi isina tsvina, sehupfumi duplex Stainless steel pombi 2101, kusvika kumagiredhi akaenzana ne6% molybdenum Stainless simbi, seSAF 2507. Duplex Stainless steel pombi dzine zvakanaka kwazvo. stress corrosion cracking (SCC) kuramba, iyo "inhaka" kubva kune ferrite side. Kugona kwese duplex Stainless simbi pombi kuramba chloride stress corrosion kuparuka kuri nani pane iyo ye300 series austenitic stainless steel. Standard austenitic Stainless simbi mamakisi senge 304 uye 316 anogona kutambura nekushushikana kuora kutsemuka pamberi peioni chloride, mhepo ine hunyoro, uye tembiricha yakakwira. Naizvozvo, mune zvakawanda zvinoshandiswa muindasitiri yemakemikari uko kune njodzi huru yekushungurudzika kuora, duplex simbi isina tsvina pombi inowanzoshandiswa panzvimbo yeaustenitic simbi isina tsvina.

04-Zvinhu zvemuviri: Pakati pe austenitic simbi isina tsvina uye ferritic simbi isina tsvina, asi padyo neferritic Stainless simbi uye kabhoni simbi. Zvinowanzotendwa kuti kuita kwakanaka kunogona kuwanikwa kana chiyero cheferrite chikamu kune austenite chikamu mu duplex Stainless simbi pombi iri 30% kusvika 70%. Nekudaro, duplex simbi isina tsvina pombi dzinowanzoonekwa seinenge hafu ferrite uye hafu austenite. Mukugadzirwa kwazvino kwekutengesa, kuti uwane iyo yakanyanya kuoma uye maitiro ekugadzirisa, chikamu cheaustenite chakati kurei. Kudyidzana pakati pezvinhu zvikuru zvinosanganisa, kunyanya chromium, molybdenum, nitrogen, uye nickel, yakaoma kwazvo. Kuti uwane yakagadzikana-yechikamu chimiro chinobatsira kugadzirisa uye kugadzira, kutarisirwa kunofanirwa kutorwa kuti ive nechokwadi chekuti chinhu chimwe nechimwe chine zvakakodzera.

Pamusoro pechikamu chechiyero, chechipiri chikuru kunetseka nezve duplex simbi isina tsvina pombi uye chimiro chayo chemakemikari ndiko kuumbwa kweanokuvadza intermetallic nhanho patembiricha yakakwira. σ chikamu uye χ chikamu chinoumbwa mune yakakwira chromium uye yakakwira molybdenum simbi isina tsvina uye yakasarudzika inonaya muchikamu cheferrite. Kuwedzerwa kwenitrogen kunonotsa zvikuru kuumbwa kwezvikamu izvi. Saka zvakakosha kuchengetedza huwandu hwakakwana hwe nitrogen mumugadziro wakasimba. Sezvo ruzivo ne duplex Stainless simbi pombi kugadzira kuchiwedzera, kukosha kwekudzora nhete ekuumbwa siyana kuri kuwedzera kuzivikanwa. Iyo yekutanga yakasetwa yemhando ye2205 duplex stainless simbi pombi yakapamhama. Chiitiko chinoratidza kuti kuwana iyo yakanakisa corrosion resistance uye kudzivisa kuumbwa kwe intermetallic phases, chromium, molybdenum, uye nitrogen zviri mukati meS31803 zvinofanira kuchengetwa pakati nepamusoro pemiganhu yehuwandu hwehuwandu. Izvi zvakatungamira kune yakavandudzwa 2205 dual-phase simbi UNS S32205 ine nhete yekuumbwa renji.