Cov lus qhia dav rau Duplex Stainless hlau: 2205 (Uns Uns Uns UnsT S32205 \/ uns unic s31803)
Dab tsi yog 2205 (Uns Unit S32205 \/ uns unic s31803)?
Tsim raws li uns uns s32205 lossis din w.nr. 1.4462, F60 yog lub duplex stainless hlau paub rau nws ob-theem qauv, suav nrog theem qib siab thiab theem Austenite. Nrog cov ntsiab lus chromium ntawm 22%, ib qho cov ntsiab lus molybdenum ntawm 3%, thiab cov ntsiab lus npib tsib xee ntawm 5%, cov khoom pov thawj no zoo dua cov khoom zoo dua. Nws muaj lub zog ntau dua zog ua lub zog dua cov qauv ustenitic stades. Tsis tas li ntawd, nws tseem muaj qhov ua tau zoo heev rau pitting thiab corrose corrosion, ua rau nws haum rau siv nyob rau hauv ntau ntawm kev xeb ib puag ncig. Feem ntau, nws tau ua li qhuas Weldability, ntxiv txhim kho nws cov kev pab ntau tag nrho.
Tsim raws li uns uns uns s31803 lossis din w.nr. 1.4462, F51 yog lwm cov hlwv uas tsis zoo ib yam li tsis zoo li S32205, txawm hais tias qhov yuav tsum tau rau chromium, molybdenum thiab nitrogen cov ntsiab lus yuav qis me ntsis. Feem ntau, hauv kev siv tiag tiag, tsis yog S31803 thiab S32203 feem ntau hu ua "Duplex Stainless Hlau 2205".
Duplex stainless hlau yog hais txog stainless hlau nrog ob qho tib si ntawm cov qauv, uas ua ke cov khoom ua tau zoo ntawm cov hlau Ferritic thiab Austenitic steel. Lub xub ntiag ntawm ib qib Austenite txo tus brittleness ntawm high-kub ferritic steel, thiab txhim kho kev sib daj sib luag thiab werritic steel; Lub xub ntiag ntawm Ferrite theem nce cov txiaj ntsig lub zog ntawm cov hlau Austenitic, thaum lub sij hawm txhim kho nws kev tiv thaiv nws txoj kev ntxhov siab corrosion thiab intergranular corrosion.
Unrical tsis yog S32205: Ib qho tsis sib piv
UnrenT S31803 thiab S32205 muaj kev sib thooj dua dua li qhov sib txawv. Firstly, ob qho tib si yog stainless hlau alloys nrog zoo heev xws li cov khoom lag luam theem pib. Lawv zwm rau lub duplex 2205 tsev neeg, uas muaj yuav luag sib npaug sib npaug ntawm Austenite thiab Ferrite. Tsis tas li ntawd, ob qho tib si yog muaj zog heev thiab ruaj, haum rau cov txheej txheem kev lag luam uas xav tau cov khoom kom tiv thaiv hnyav.
Lub ntsiab sib txawv txawv ntawm ob lus dag nyob hauv cov ntsiab lus nitrogen. Unr unric unic s32205 muaj cov ntsiab lus nitrogen ntau dua, muab ib txheej ntxiv tiv thaiv ntxiv rau qhov muaj zog nto. Lub xub ntiag ntawm nitrogen txhim kho cov alloy lub zog thiab nce nws txoj kev tiv thaiv kom corrosive tebchaw uas cuam tshuam nws cov qauv kev ncaj ncees. Qhov ntau dua corrosion tsis kam muab tsis tau S32205 me me tab sis tseem ceeb tshaj plaws kom tau zoo dua nws cov counterparts.
Kev tiv thaiv tus kheej txhim kho kev tiv thaiv tus kheej vim kev qhia ntawm nitrogen yog ib qho txiaj ntsig ntxiv. Yav dhau los ib tug txhim khu kev qha ob lub roj, qhov sib ntxiv ntawm cov nitrogen ntxiv kom nws muaj peev xwm hnav thiab tswj hwm nws txoj haujlwm ua cov khoom siv txhim khu kev qha thiab muaj peev xwm.
Corrosion Kuj ntawm 2205 Qib
2205 Qib Stainless Hlau muaj cov tshuaj tiv thaiv corrosion zoo heev, ntau dua li 316 qib. Nws tiv taus cov hom corrosion zoo xws li intergranular corrosion, Crevice corrosion, kev sib tw. Lub cpt ntawm hom no ntawm cov hlau stainless yog li 35 degree. Qhov no qib kawm tuaj yeem tiv thaiv cov chloride kev ntxhov siab corrosion (SCC) ntawm 150 degree. 2205 Qib Stainless Hlau yog ib qho haum rau cov hlau ua tsis tau zoo, tshwj xeeb tshaj yog nyob rau ib puag ncig ua tsis tau zoo thiab chaw muaj dej hiav txwv.
Piv nrog ustenitic stainless hlau, duplex stainless hlau yog tsis tshua rhiab los intergranular corrosion. Thaum Duplex stainless hlau yog conflex steel hlau, carbons prepemitate nyiam ntawm ib sab, thiab theem ciam teb carbides Δ \/ precipitate nrog kev nyuaj thiab hauv cov khoom me me. Txij li thaum Austenite nplej thiab ferrite nplej puag ncig, txawm tias muaj nag lossis daus tsis tuaj yeem tsim tau nrawm nrawm ntawm cov pa hluav taws xob hauv av, yog li zam dhau qhov tob ntawm cov xeb hauv nruab nrab.
Duplex Stainless hlau muaj kev ntxhov siab ntau corrosion tsis kam, uas nce nrog nce ntawm ferrite cov ntsiab lus. Kev Nyuaj Siab Kev Txaus Siab Qhov tsawg kawg yog thaum Ferrite theem cov ntsiab lus yog kwv yees li 50%, vim tias cov kab tawg pib hauv cov theem ua:
(1) Raws li kev ntxhov siab qis, nws yog qhov nyuaj rau kev plam mus rau sab hauv cov theem ferrite thiab ua rau tawg;
(2) Cov lus tsis zoo muaj peev xwm txheeb ze rau theem Austenite, uas ua si Cathodic kev tiv thaiv lub luag haujlwm rau theem Austenite;
(3) theem Austenite yog dispersed nyob rau hauv ferrite matrix thiab mechanically tiv thaiv cov lus tshaj tawm tawg vim tias cov nyhuv xauv.
Thaum tshav kub kub ua hauj 2205 qib
Cov oxidation siab tiv taus ntawm 2205 qib yog pom zoo los ntawm nws cov embrittlement saum 300 degree. Qhov no puag txoj kev tuaj yeem hloov tau tag nrho kev daws anealing. Cov kev kawm ua tau zoo nyob rau ntawm qhov kub hauv qab no 300 degree.
Kev kho cua sov ntawm 2205 qib
Qhov kev kho cua sov tsim nyog tshaj plaws rau qib no yog kev kho cov kev kho mob (anealing) ntawm qhov kub ntawm 1020 - 1100 degree, ua raws li cov neeg txias txias sai. 2205 qib yuav ua tau haujlwm tawv, tab sis tsis tuaj yeem ua tsis tau los ntawm txoj kev thermal.
